diff options
| -rw-r--r-- | CMakeLists.txt | 1 | ||||
| -rw-r--r-- | cmake/core-files.cmake | 4 | ||||
| -rw-r--r-- | cmake/core.cmake | 1 | ||||
| -rw-r--r-- | src/clipper/clipper.cpp | 5687 | ||||
| -rw-r--r-- | src/clipper/clipper.hpp | 450 | ||||
| -rwxr-xr-x | src/clipper/fix_members.sh | 24 | ||||
| -rw-r--r-- | src/mbgl/tile/geometry_tile_data.cpp | 114 |
7 files changed, 70 insertions, 6211 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 123158e2eb..49f3443d9e 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -51,6 +51,7 @@ mason_use(protozero VERSION 1.4.2 HEADER_ONLY) mason_use(pixelmatch VERSION 0.10.0 HEADER_ONLY) mason_use(geojson VERSION 0.4.0 HEADER_ONLY) mason_use(polylabel VERSION 1.0.2 HEADER_ONLY) +mason_use(wagyu VERSION 0.4.1 HEADER_ONLY) add_definitions(-DRAPIDJSON_HAS_STDSTRING=1) diff --git a/cmake/core-files.cmake b/cmake/core-files.cmake index b10d7cff6c..9b5ddc97d6 100644 --- a/cmake/core-files.cmake +++ b/cmake/core-files.cmake @@ -35,10 +35,6 @@ set(MBGL_CORE_FILES src/mbgl/annotation/symbol_annotation_impl.cpp src/mbgl/annotation/symbol_annotation_impl.hpp - # clipper - src/clipper/clipper.cpp - src/clipper/clipper.hpp - # csscolorparser src/csscolorparser/csscolorparser.cpp src/csscolorparser/csscolorparser.hpp diff --git a/cmake/core.cmake b/cmake/core.cmake index 59de7708b6..723139e368 100644 --- a/cmake/core.cmake +++ b/cmake/core.cmake @@ -24,6 +24,7 @@ target_add_mason_package(mbgl-core PRIVATE kdbush) target_add_mason_package(mbgl-core PRIVATE earcut) target_add_mason_package(mbgl-core PRIVATE protozero) target_add_mason_package(mbgl-core PRIVATE polylabel) +target_add_mason_package(mbgl-core PRIVATE wagyu) mbgl_platform_core() diff --git a/src/clipper/clipper.cpp b/src/clipper/clipper.cpp deleted file mode 100644 index 5f4ac4d481..0000000000 --- a/src/clipper/clipper.cpp +++ /dev/null @@ -1,5687 +0,0 @@ -/*******************************************************************************
-* *
-* Author : Angus Johnson *
-* Version : 6.4.0 *
-* Date : 2 July 2015 *
-* Website : http://www.angusj.com *
-* Copyright : Angus Johnson 2010-2015 *
-* *
-* License: *
-* Use, modification & distribution is subject to Boost Software License Ver 1. *
-* http://www.boost.org/LICENSE_1_0.txt *
-* *
-* Attributions: *
-* The code in this library is an extension of Bala Vatti's clipping algorithm: *
-* "A generic solution to polygon clipping" *
-* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63. *
-* http://portal.acm.org/citation.cfm?id=129906 *
-* *
-* Computer graphics and geometric modeling: implementation and algorithms *
-* By Max K. Agoston *
-* Springer; 1 edition (January 4, 2005) *
-* http://books.google.com/books?q=vatti+clipping+agoston *
-* *
-* See also: *
-* "Polygon Offsetting by Computing Winding Numbers" *
-* Paper no. DETC2005-85513 pp. 565-575 *
-* ASME 2005 International Design Engineering Technical Conferences *
-* and Computers and Information in Engineering Conference (IDETC/CIE2005) *
-* September 24-28, 2005 , Long Beach, California, USA *
-* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf *
-* *
-*******************************************************************************/
-
-/*******************************************************************************
-* *
-* This is a translation of the Delphi Clipper library and the naming style *
-* used has retained a Delphi flavour. *
-* *
-*******************************************************************************/
-
-#include "clipper.hpp"
-#include <cmath>
-#include <vector>
-#include <algorithm>
-#include <stdexcept>
-#include <cstring>
-#include <cstdlib>
-#include <ostream>
-#include <functional>
-#include <sstream>
-
-namespace ClipperLib {
-
-static double const pi = 3.141592653589793238;
-static double const two_pi = pi *2;
-static double const def_arc_tolerance = 0.25;
-
-enum Direction { dRightToLeft, dLeftToRight };
-
-static int const Unassigned = -1; //edge not currently 'owning' a solution
-static int const Skip = -2; //edge that would otherwise close a path
-
-#define HORIZONTAL (-1.0E+40)
-#define TOLERANCE (1.0e-20)
-#define NEAR_ZERO(val) (((val) > -TOLERANCE) && ((val) < TOLERANCE))
-
-struct TEdge {
- IntPoint Bot;
- IntPoint Curr; //current (updated for every new scanbeam)
- IntPoint Top;
- double Dx;
- PolyType PolyTyp;
- EdgeSide Side; //side only refers to current side of solution poly
- int WindDelta; //1 or -1 depending on winding direction
- int WindCnt;
- int WindCnt2; //winding count of the opposite polytype
- int OutIdx;
- TEdge *Next;
- TEdge *Prev;
- TEdge *NextInLML;
- TEdge *NextInAEL;
- TEdge *PrevInAEL;
- TEdge *NextInSEL;
- TEdge *PrevInSEL;
-};
-
-struct IntersectNode {
- TEdge *Edge1;
- TEdge *Edge2;
- IntPoint Pt;
-};
-
-struct LocalMinimum {
- cInt y;
- TEdge *LeftBound;
- TEdge *RightBound;
-};
-
-struct OutPt;
-
-//OutRec: contains a path in the clipping solution. Edges in the AEL will
-//carry a pointer to an OutRec when they are part of the clipping solution.
-struct OutRec {
- int Idx;
- bool IsHole;
- bool IsOpen;
- OutRec *FirstLeft; //see comments in clipper.pas
- PolyNode *PolyNd;
- OutPt *Pts;
- OutPt *BottomPt;
-};
-
-struct OutPt {
- int Idx;
- IntPoint Pt;
- OutPt *Next;
- OutPt *Prev;
-};
-
-struct Join {
- OutPt *OutPt1;
- OutPt *OutPt2;
- IntPoint OffPt;
-};
-
-struct LocMinSorter
-{
- inline bool operator()(const LocalMinimum& locMin1, const LocalMinimum& locMin2)
- {
- return locMin2.y < locMin1.y;
- }
-};
-
-//------------------------------------------------------------------------------
-//------------------------------------------------------------------------------
-
-inline cInt Round(double val)
-{
- if ((val < 0)) return static_cast<cInt>(val - 0.5);
- else return static_cast<cInt>(val + 0.5);
-}
-//------------------------------------------------------------------------------
-
-inline cInt Abs(cInt val)
-{
- return val < 0 ? -val : val;
-}
-
-//------------------------------------------------------------------------------
-// PolyTree methods ...
-//------------------------------------------------------------------------------
-
-void PolyTree::Clear()
-{
- for (PolyNodes::size_type i = 0; i < AllNodes.size(); ++i)
- delete AllNodes[i];
- AllNodes.resize(0);
- Childs.resize(0);
-}
-//------------------------------------------------------------------------------
-
-PolyNode* PolyTree::GetFirst() const
-{
- if (!Childs.empty())
- return Childs[0];
- else
- return 0;
-}
-//------------------------------------------------------------------------------
-
-int PolyTree::Total() const
-{
- int result = (int)AllNodes.size();
- //with negative offsets, ignore the hidden outer polygon ...
- if (result > 0 && Childs[0] != AllNodes[0]) result--;
- return result;
-}
-
-//------------------------------------------------------------------------------
-// PolyNode methods ...
-//------------------------------------------------------------------------------
-
-PolyNode::PolyNode(): Childs(), Parent(0), Index(0), m_IsOpen(false)
-{
-}
-//------------------------------------------------------------------------------
-
-int PolyNode::ChildCount() const
-{
- return (int)Childs.size();
-}
-//------------------------------------------------------------------------------
-
-void PolyNode::AddChild(PolyNode& child)
-{
- unsigned cnt = (unsigned)Childs.size();
- Childs.push_back(&child);
- child.Parent = this;
- child.Index = cnt;
-}
-//------------------------------------------------------------------------------
-
-PolyNode* PolyNode::GetNext() const
-{
- if (!Childs.empty())
- return Childs[0];
- else
- return GetNextSiblingUp();
-}
-//------------------------------------------------------------------------------
-
-PolyNode* PolyNode::GetNextSiblingUp() const
-{
- if (!Parent) //protects against PolyTree.GetNextSiblingUp()
- return 0;
- else if (Index == Parent->Childs.size() - 1)
- return Parent->GetNextSiblingUp();
- else
- return Parent->Childs[Index + 1];
-}
-//------------------------------------------------------------------------------
-
-bool PolyNode::IsHole() const
-{
- bool result = true;
- PolyNode* node = Parent;
- while (node)
- {
- result = !result;
- node = node->Parent;
- }
- return result;
-}
-//------------------------------------------------------------------------------
-
-bool PolyNode::IsOpen() const
-{
- return m_IsOpen;
-}
-//------------------------------------------------------------------------------
-
-#ifndef use_int32
-
-//------------------------------------------------------------------------------
-// Int128 class (enables safe math on signed 64bit integers)
-// eg Int128 val1((long64)9223372036854775807); //ie 2^63 -1
-// Int128 val2((long64)9223372036854775807);
-// Int128 val3 = val1 * val2;
-// val3.AsString => "85070591730234615847396907784232501249" (8.5e+37)
-//------------------------------------------------------------------------------
-
-class Int128
-{
- public:
- ulong64 lo;
- long64 hi;
-
- Int128(long64 _lo = 0)
- {
- lo = (ulong64)_lo;
- if (_lo < 0) hi = -1; else hi = 0;
- }
-
-
- Int128(const Int128 &val): lo(val.lo), hi(val.hi){}
-
- Int128(const long64& _hi, const ulong64& _lo): lo(_lo), hi(_hi){}
-
- Int128& operator = (const long64 &val)
- {
- lo = (ulong64)val;
- if (val < 0) hi = -1; else hi = 0;
- return *this;
- }
-
- bool operator == (const Int128 &val) const
- {return (hi == val.hi && lo == val.lo);}
-
- bool operator != (const Int128 &val) const
- { return !(*this == val);}
-
- bool operator > (const Int128 &val) const
- {
- if (hi != val.hi)
- return hi > val.hi;
- else
- return lo > val.lo;
- }
-
- bool operator < (const Int128 &val) const
- {
- if (hi != val.hi)
- return hi < val.hi;
- else
- return lo < val.lo;
- }
-
- bool operator >= (const Int128 &val) const
- { return !(*this < val);}
-
- bool operator <= (const Int128 &val) const
- { return !(*this > val);}
-
- Int128& operator += (const Int128 &rhs)
- {
- hi += rhs.hi;
- lo += rhs.lo;
- if (lo < rhs.lo) hi++;
- return *this;
- }
-
- Int128 operator + (const Int128 &rhs) const
- {
- Int128 result(*this);
- result+= rhs;
- return result;
- }
-
- Int128& operator -= (const Int128 &rhs)
- {
- *this += -rhs;
- return *this;
- }
-
- Int128 operator - (const Int128 &rhs) const
- {
- Int128 result(*this);
- result -= rhs;
- return result;
- }
-
- Int128 operator-() const //unary negation
- {
- if (lo == 0)
- return Int128(-hi, 0);
- else
- return Int128(~hi, ~lo + 1);
- }
-
- operator double() const
- {
- const double shift64 = 18446744073709551616.0; //2^64
- if (hi < 0)
- {
- if (lo == 0) return (double)hi * shift64;
- else return -(double)(~lo + ~hi * shift64);
- }
- else
- return (double)(lo + hi * shift64);
- }
-
-};
-//------------------------------------------------------------------------------
-
-Int128 Int128Mul (long64 lhs, long64 rhs)
-{
- bool negate = (lhs < 0) != (rhs < 0);
-
- if (lhs < 0) lhs = -lhs;
- ulong64 int1Hi = ulong64(lhs) >> 32;
- ulong64 int1Lo = ulong64(lhs & 0xFFFFFFFF);
-
- if (rhs < 0) rhs = -rhs;
- ulong64 int2Hi = ulong64(rhs) >> 32;
- ulong64 int2Lo = ulong64(rhs & 0xFFFFFFFF);
-
- //nb: see comments in clipper.pas
- ulong64 a = int1Hi * int2Hi;
- ulong64 b = int1Lo * int2Lo;
- ulong64 c = int1Hi * int2Lo + int1Lo * int2Hi;
-
- Int128 tmp;
- tmp.hi = long64(a + (c >> 32));
- tmp.lo = long64(c << 32);
- tmp.lo += long64(b);
- if (tmp.lo < b) tmp.hi++;
- if (negate) tmp = -tmp;
- return tmp;
-};
-#endif
-
-//------------------------------------------------------------------------------
-// Miscellaneous global functions
-//------------------------------------------------------------------------------
-
-bool Orientation(const Path &poly)
-{
- return Area(poly) >= 0;
-}
-//------------------------------------------------------------------------------
-
-double Area(const Path &poly)
-{
- int size = (int)poly.size();
- if (size < 3) return 0;
-
- double a = 0;
- for (int i = 0, j = size -1; i < size; ++i)
- {
- a += ((double)poly[j].x + poly[i].x) * ((double)poly[j].y - poly[i].y);
- j = i;
- }
- return -a * 0.5;
-}
-//------------------------------------------------------------------------------
-
-double Area(const OutPt *op)
-{
- const OutPt *startOp = op;
- if (!op) return 0;
- double a = 0;
- do {
- a += (double)(op->Prev->Pt.x + op->Pt.x) * (double)(op->Prev->Pt.y - op->Pt.y);
- op = op->Next;
- } while (op != startOp);
- return a * 0.5;
-}
-//------------------------------------------------------------------------------
-
-double Area(const OutRec &outRec)
-{
- return Area(outRec.Pts);
-}
-//------------------------------------------------------------------------------
-
-bool PointIsVertex(const IntPoint &Pt, OutPt *pp)
-{
- OutPt *pp2 = pp;
- do
- {
- if (pp2->Pt == Pt) return true;
- pp2 = pp2->Next;
- }
- while (pp2 != pp);
- return false;
-}
-//------------------------------------------------------------------------------
-
-//See "The Point in Polygon Problem for Arbitrary Polygons" by Hormann & Agathos
-//http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.5498&rep=rep1&type=pdf
-int PointInPolygon(const IntPoint &pt, const Path &path)
-{
- //returns 0 if false, +1 if true, -1 if pt ON polygon boundary
- int result = 0;
- size_t cnt = path.size();
- if (cnt < 3) return 0;
- IntPoint ip = path[0];
- for(size_t i = 1; i <= cnt; ++i)
- {
- IntPoint ipNext = (i == cnt ? path[0] : path[i]);
- if (ipNext.y == pt.y)
- {
- if ((ipNext.x == pt.x) || (ip.y == pt.y &&
- ((ipNext.x > pt.x) == (ip.x < pt.x)))) return -1;
- }
- if ((ip.y < pt.y) != (ipNext.y < pt.y))
- {
- if (ip.x >= pt.x)
- {
- if (ipNext.x > pt.x) result = 1 - result;
- else
- {
- double d = (double)(ip.x - pt.x) * (ipNext.y - pt.y) -
- (double)(ipNext.x - pt.x) * (ip.y - pt.y);
- if (!d) return -1;
- if ((d > 0) == (ipNext.y > ip.y)) result = 1 - result;
- }
- } else
- {
- if (ipNext.x > pt.x)
- {
- double d = (double)(ip.x - pt.x) * (ipNext.y - pt.y) -
- (double)(ipNext.x - pt.x) * (ip.y - pt.y);
- if (!d) return -1;
- if ((d > 0) == (ipNext.y > ip.y)) result = 1 - result;
- }
- }
- }
- ip = ipNext;
- }
- return result;
-}
-//------------------------------------------------------------------------------
-
-int PointInPolygon (const IntPoint &pt, OutPt *op)
-{
- //returns 0 if false, +1 if true, -1 if pt ON polygon boundary
- int result = 0;
- OutPt* startOp = op;
- for(;;)
- {
- if (op->Next->Pt.y == pt.y)
- {
- if ((op->Next->Pt.x == pt.x) || (op->Pt.y == pt.y &&
- ((op->Next->Pt.x > pt.x) == (op->Pt.x < pt.x)))) return -1;
- }
- if ((op->Pt.y < pt.y) != (op->Next->Pt.y < pt.y))
- {
- if (op->Pt.x >= pt.x)
- {
- if (op->Next->Pt.x > pt.x) result = 1 - result;
- else
- {
- double d = (double)(op->Pt.x - pt.x) * (op->Next->Pt.y - pt.y) -
- (double)(op->Next->Pt.x - pt.x) * (op->Pt.y - pt.y);
- if (!d) return -1;
- if ((d > 0) == (op->Next->Pt.y > op->Pt.y)) result = 1 - result;
- }
- } else
- {
- if (op->Next->Pt.x > pt.x)
- {
- double d = (double)(op->Pt.x - pt.x) * (op->Next->Pt.y - pt.y) -
- (double)(op->Next->Pt.x - pt.x) * (op->Pt.y - pt.y);
- if (!d) return -1;
- if ((d > 0) == (op->Next->Pt.y > op->Pt.y)) result = 1 - result;
- }
- }
- }
- op = op->Next;
- if (startOp == op) break;
- }
- return result;
-}
-//------------------------------------------------------------------------------
-
-bool Poly2ContainsPoly1(OutPt *OutPt1, OutPt *OutPt2)
-{
- OutPt* op = OutPt1;
- do
- {
- //nb: PointInPolygon returns 0 if false, +1 if true, -1 if pt on polygon
- int res = PointInPolygon(op->Pt, OutPt2);
- if (res >= 0) return res > 0;
- op = op->Next;
- }
- while (op != OutPt1);
- return true;
-}
-//----------------------------------------------------------------------
-
-bool SlopesEqual(const TEdge &e1, const TEdge &e2, bool UseFullInt64Range)
-{
-#ifndef use_int32
- if (UseFullInt64Range)
- return Int128Mul(e1.Top.y - e1.Bot.y, e2.Top.x - e2.Bot.x) ==
- Int128Mul(e1.Top.x - e1.Bot.x, e2.Top.y - e2.Bot.y);
- else
-#endif
- return (e1.Top.y - e1.Bot.y) * (e2.Top.x - e2.Bot.x) ==
- (e1.Top.x - e1.Bot.x) * (e2.Top.y - e2.Bot.y);
-}
-//------------------------------------------------------------------------------
-
-bool SlopesEqual(const IntPoint pt1, const IntPoint pt2,
- const IntPoint pt3, bool UseFullInt64Range)
-{
-#ifndef use_int32
- if (UseFullInt64Range)
- return Int128Mul(pt1.y-pt2.y, pt2.x-pt3.x) == Int128Mul(pt1.x-pt2.x, pt2.y-pt3.y);
- else
-#endif
- return (pt1.y-pt2.y)*(pt2.x-pt3.x) == (pt1.x-pt2.x)*(pt2.y-pt3.y);
-}
-//------------------------------------------------------------------------------
-
-bool SlopesEqual(const IntPoint pt1, const IntPoint pt2,
- const IntPoint pt3, const IntPoint pt4, bool UseFullInt64Range)
-{
-#ifndef use_int32
- if (UseFullInt64Range)
- return Int128Mul(pt1.y-pt2.y, pt3.x-pt4.x) == Int128Mul(pt1.x-pt2.x, pt3.y-pt4.y);
- else
-#endif
- return (pt1.y-pt2.y)*(pt3.x-pt4.x) == (pt1.x-pt2.x)*(pt3.y-pt4.y);
-}
-//------------------------------------------------------------------------------
-
-inline bool IsHorizontal(TEdge &e)
-{
- return e.Dx == HORIZONTAL;
-}
-//------------------------------------------------------------------------------
-
-inline double GetDx(const IntPoint pt1, const IntPoint pt2)
-{
- return (pt1.y == pt2.y) ?
- HORIZONTAL : (double)(pt2.x - pt1.x) / (pt2.y - pt1.y);
-}
-//---------------------------------------------------------------------------
-
-inline void SetDx(TEdge &e)
-{
- cInt dy = (e.Top.y - e.Bot.y);
- if (dy == 0) e.Dx = HORIZONTAL;
- else e.Dx = (double)(e.Top.x - e.Bot.x) / dy;
-}
-//---------------------------------------------------------------------------
-
-inline void SwapSides(TEdge &Edge1, TEdge &Edge2)
-{
- EdgeSide Side = Edge1.Side;
- Edge1.Side = Edge2.Side;
- Edge2.Side = Side;
-}
-//------------------------------------------------------------------------------
-
-inline void SwapPolyIndexes(TEdge &Edge1, TEdge &Edge2)
-{
- int OutIdx = Edge1.OutIdx;
- Edge1.OutIdx = Edge2.OutIdx;
- Edge2.OutIdx = OutIdx;
-}
-//------------------------------------------------------------------------------
-
-inline cInt TopX(TEdge &edge, const cInt currentY)
-{
- return ( currentY == edge.Top.y ) ?
- edge.Top.x : edge.Bot.x + Round(edge.Dx *(currentY - edge.Bot.y));
-}
-//------------------------------------------------------------------------------
-
-void IntersectPoint(TEdge &Edge1, TEdge &Edge2, IntPoint &ip)
-{
-#ifdef use_xyz
- ip.Z = 0;
-#endif
-
- double b1, b2;
- if (Edge1.Dx == Edge2.Dx)
- {
- ip.y = Edge1.Curr.y;
- ip.x = TopX(Edge1, ip.y);
- return;
- }
- else if (Edge1.Dx == 0.0)
- {
- ip.x = Edge1.Bot.x;
- if (IsHorizontal(Edge2))
- ip.y = Edge2.Bot.y;
- else
- {
- b2 = Edge2.Bot.y - (Edge2.Bot.x / Edge2.Dx);
- if (Edge2.Bot.x == Edge1.Bot.x) ip.y = Round(ip.x / Edge2.Dx + b2);
- else if (Edge2.Bot.x < Edge1.Bot.x) ip.y = Round((ip.x - 0.5) / Edge2.Dx + b2);
- else ip.y = Round((ip.x + 0.5) / Edge2.Dx + b2);
- }
- }
- else if (Edge2.Dx == 0.0)
- {
- ip.x = Edge2.Bot.x;
- if (IsHorizontal(Edge1))
- ip.y = Edge1.Bot.y;
- else
- {
- b1 = Edge1.Bot.y - (Edge1.Bot.x / Edge1.Dx);
- if (Edge1.Bot.x == Edge2.Bot.x) ip.y = Round(ip.x / Edge1.Dx + b1);
- else if (Edge1.Bot.x < Edge2.Bot.x) ip.y = Round((ip.x - 0.5) / Edge1.Dx + b1);
- else ip.y = Round((ip.x + 0.5) / Edge1.Dx + b1);
- }
- }
- else
- {
- b1 = Edge1.Bot.x - Edge1.Bot.y * Edge1.Dx;
- b2 = Edge2.Bot.x - Edge2.Bot.y * Edge2.Dx;
- double q = (b2-b1) / (Edge1.Dx - Edge2.Dx);
- ip.y = Round(q);
- if (std::fabs(Edge1.Dx) < std::fabs(Edge2.Dx))
- ip.x = Round(Edge1.Dx * q + b1);
- else
- ip.x = Round(Edge2.Dx * q + b2);
- // the idea is simply to looking closer
- // towards the origins of the lines (Edge1.Bot and Edge2.Bot)
- // until we do not find pixels that both lines travel through
- bool keep_searching = false;
- double by1 = Edge1.Bot.y - (Edge1.Bot.x / Edge1.Dx);
- double by2 = Edge2.Bot.y - (Edge2.Bot.x / Edge2.Dx);
- double bx1 = Edge1.Bot.x - (Edge1.Bot.y * Edge1.Dx);
- double bx2 = Edge2.Bot.x - (Edge2.Bot.y * Edge2.Dx);
- do
- {
- keep_searching = false;
- cInt y1 = ip.y;
- cInt y2 = ip.y;
- if (Edge1.Bot.x > ip.x)
- {
- if (Edge1.Bot.y >= ip.y)
- {
- y1 = std::floor(((ip.x + 0.5) / Edge1.Dx + by1) + 0.5);
- }
- else
- {
- y1 = std::ceil(((ip.x + 0.5) / Edge1.Dx + by1) - 0.5);
- }
- }
- else if (Edge1.Bot.x < ip.x)
- {
- if (Edge1.Bot.y >= ip.y)
- {
- y1 = std::floor(((ip.x - 0.5) / Edge1.Dx + by1) + 0.5);
- }
- else
- {
- y1 = std::ceil(((ip.x - 0.5) / Edge1.Dx + by1) - 0.5);
- }
- }
- else if (Edge1.Bot.y > ip.y)
- {
- if (Edge2.Bot.y >= Edge1.Bot.y)
- {
- y1 = Edge1.Bot.y;
- }
- else
- {
- y1 = Edge2.Bot.y;
- }
- }
- else if (Edge1.Bot.y < ip.y)
- {
- if (Edge2.Bot.y <= Edge1.Bot.y)
- {
- y1 = Edge1.Bot.y;
- }
- else
- {
- y1 = Edge2.Bot.y;
- }
- }
- if (ip.y >= Edge1.Bot.y && y1 < Edge1.Bot.y) y1 = Edge1.Bot.y;
- else if (ip.y <= Edge1.Bot.y && y1 > Edge1.Bot.y) y1 = Edge1.Bot.y;
- if (Edge2.Bot.x > ip.x)
- {
- if (Edge2.Bot.y >= ip.y)
- {
- y2 = std::floor(((ip.x + 0.5) / Edge2.Dx + by2) + 0.5);
- }
- else
- {
- y2 = std::ceil(((ip.x + 0.5) / Edge2.Dx + by2) - 0.5);
- }
- }
- else if (Edge2.Bot.x < ip.x)
- {
- if (Edge2.Bot.y >= ip.y)
- {
- y2 = std::floor(((ip.x - 0.5) / Edge2.Dx + by2) + 0.5);
- }
- else
- {
- y2 = std::ceil(((ip.x - 0.5) / Edge2.Dx + by2) - 0.5);
- }
- }
- else if (Edge2.Bot.y > ip.y)
- {
- if (Edge1.Bot.y >= Edge2.Bot.y)
- {
- y2 = Edge2.Bot.y;
- }
- else
- {
- y2 = Edge1.Bot.y;
- }
- }
- else if (Edge2.Bot.y < ip.y)
- {
- if (Edge1.Bot.y <= Edge2.Bot.y)
- {
- y2 = Edge2.Bot.y;
- }
- else
- {
- y2 = Edge1.Bot.y;
- }
- }
- if (ip.y >= Edge2.Bot.y && y2 < Edge2.Bot.y) y2 = Edge2.Bot.y;
- else if (ip.y <= Edge2.Bot.y && y2 > Edge2.Bot.y) y2 = Edge2.Bot.y;
- cInt x1 = ip.x;
- cInt x2 = ip.x;
- if (Edge1.Bot.y > ip.y)
- {
- if (Edge1.Bot.x >= ip.x)
- {
- x1 = std::floor(((ip.y + 0.5) * Edge1.Dx + bx1) + 0.5);
- }
- else
- {
- x1 = std::ceil(((ip.y + 0.5) * Edge1.Dx + bx1) - 0.5);
- }
- }
- else if (Edge1.Bot.y < ip.y)
- {
- if (Edge1.Bot.x >= ip.x)
- {
- x1 = std::floor(((ip.y - 0.5) * Edge1.Dx + bx1) + 0.5);
- }
- else
- {
- x1 = std::ceil(((ip.y - 0.5) * Edge1.Dx + bx1) - 0.5);
- }
- }
- else if (Edge1.Bot.x > ip.x)
- {
- if (Edge2.Bot.x >= Edge1.Bot.x)
- {
- x1 = Edge1.Bot.x;
- }
- else
- {
- x1 = Edge2.Bot.x;
- }
- }
- else if (Edge1.Bot.x < ip.x)
- {
- if (Edge2.Bot.x <= Edge1.Bot.x)
- {
- x1 = Edge1.Bot.x;
- }
- else
- {
- x1 = Edge2.Bot.x;
- }
- }
- if (ip.x >= Edge1.Bot.x && x1 < Edge1.Bot.x) x1 = Edge1.Bot.x;
- else if (ip.x <= Edge1.Bot.x && x1 > Edge1.Bot.x) x1 = Edge1.Bot.x;
- if (Edge2.Bot.y > ip.y)
- {
- if (Edge2.Bot.x >= ip.x)
- {
- x2 = std::floor(((ip.y + 0.5) * Edge2.Dx + bx2) + 0.5);
- }
- else
- {
- x2 = std::ceil(((ip.y + 0.5) * Edge2.Dx + bx2) - 0.5);
- }
- }
- else if (Edge2.Bot.y < ip.y)
- {
- if (Edge2.Bot.x >= ip.x)
- {
- x2 = std::floor(((ip.y - 0.5) * Edge2.Dx + bx2) + 0.5);
- }
- else
- {
- x2 = std::ceil(((ip.y - 0.5) * Edge2.Dx + bx2) - 0.5);
- }
- }
- else if (Edge2.Bot.x > ip.x)
- {
- if (Edge1.Bot.x >= Edge2.Bot.x)
- {
- x2 = Edge2.Bot.x;
- }
- else
- {
- x2 = Edge1.Bot.x;
- }
- }
- else if (Edge2.Bot.x < ip.x)
- {
- if (Edge1.Bot.x <= Edge2.Bot.x)
- {
- x2 = Edge2.Bot.x;
- }
- else
- {
- x2 = Edge1.Bot.x;
- }
- }
- if (ip.x >= Edge2.Bot.x && x2 < Edge2.Bot.x) x2 = Edge2.Bot.x;
- else if (ip.x <= Edge2.Bot.x && x2 > Edge2.Bot.x) x2 = Edge2.Bot.x;
- if (y1 > ip.y && y2 > ip.y)
- {
- ip.y = std::min(y1,y2);
- keep_searching = true;
- }
- else if (y1 < ip.y && y2 < ip.y)
- {
- ip.y = std::max(y1,y2);
- keep_searching = true;
- }
- if (x1 > ip.x && x2 > ip.x)
- {
- ip.x = std::min(x1,x2);
- keep_searching = true;
- }
- else if (x1 < ip.x && x2 < ip.x)
- {
- ip.x = std::max(x1,x2);
- keep_searching = true;
- }
- }
- while (keep_searching);
- }
-
- if (ip.y < Edge1.Top.y || ip.y < Edge2.Top.y)
- {
- if (Edge1.Top.y > Edge2.Top.y)
- ip.y = Edge1.Top.y;
- else
- ip.y = Edge2.Top.y;
- if (std::fabs(Edge1.Dx) < std::fabs(Edge2.Dx))
- ip.x = TopX(Edge1, ip.y);
- else
- ip.x = TopX(Edge2, ip.y);
- }
- //finally, don't allow 'ip' to be BELOW curr.y (ie bottom of scanbeam) ...
- if (ip.y > Edge1.Curr.y)
- {
- ip.y = Edge1.Curr.y;
- //use the more vertical edge to derive X ...
- if (std::fabs(Edge1.Dx) > std::fabs(Edge2.Dx))
- ip.x = TopX(Edge2, ip.y); else
- ip.x = TopX(Edge1, ip.y);
- }
-}
-//------------------------------------------------------------------------------
-
-void ReversePolyPtLinks(OutPt *pp)
-{
- if (!pp) return;
- OutPt *pp1, *pp2;
- pp1 = pp;
- do {
- pp2 = pp1->Next;
- pp1->Next = pp1->Prev;
- pp1->Prev = pp2;
- pp1 = pp2;
- } while( pp1 != pp );
-}
-//------------------------------------------------------------------------------
-
-void DisposeOutPts(OutPt*& pp)
-{
- if (pp == 0) return;
- pp->Prev->Next = 0;
- while( pp )
- {
- OutPt *tmpPp = pp;
- pp = pp->Next;
- delete tmpPp;
- }
-}
-//------------------------------------------------------------------------------
-
-inline void InitEdge(TEdge* e, TEdge* eNext, TEdge* ePrev, const IntPoint& Pt)
-{
- std::memset(e, 0, sizeof(TEdge));
- e->Next = eNext;
- e->Prev = ePrev;
- e->Curr = Pt;
- e->OutIdx = Unassigned;
-}
-//------------------------------------------------------------------------------
-
-void InitEdge2(TEdge& e, PolyType Pt)
-{
- if (e.Curr.y >= e.Next->Curr.y)
- {
- e.Bot = e.Curr;
- e.Top = e.Next->Curr;
- } else
- {
- e.Top = e.Curr;
- e.Bot = e.Next->Curr;
- }
- SetDx(e);
- e.PolyTyp = Pt;
-}
-//------------------------------------------------------------------------------
-
-TEdge* RemoveEdge(TEdge* e)
-{
- //removes e from double_linked_list (but without removing from memory)
- e->Prev->Next = e->Next;
- e->Next->Prev = e->Prev;
- TEdge* result = e->Next;
- e->Prev = 0; //flag as removed (see ClipperBase.Clear)
- return result;
-}
-//------------------------------------------------------------------------------
-
-inline void ReverseHorizontal(TEdge &e)
-{
- //swap horizontal edges' Top and Bottom x's so they follow the natural
- //progression of the bounds - ie so their xbots will align with the
- //adjoining lower edge. [Helpful in the ProcessHorizontal() method.]
- std::swap(e.Top.x, e.Bot.x);
-#ifdef use_xyz
- std::swap(e.Top.Z, e.Bot.Z);
-#endif
-}
-//------------------------------------------------------------------------------
-
-void SwapPoints(IntPoint &pt1, IntPoint &pt2)
-{
- IntPoint tmp = pt1;
- pt1 = pt2;
- pt2 = tmp;
-}
-//------------------------------------------------------------------------------
-
-bool GetOverlapSegment(IntPoint pt1a, IntPoint pt1b, IntPoint pt2a,
- IntPoint pt2b, IntPoint &pt1, IntPoint &pt2)
-{
- //precondition: segments are Collinear.
- if (Abs(pt1a.x - pt1b.x) > Abs(pt1a.y - pt1b.y))
- {
- if (pt1a.x > pt1b.x) SwapPoints(pt1a, pt1b);
- if (pt2a.x > pt2b.x) SwapPoints(pt2a, pt2b);
- if (pt1a.x > pt2a.x) pt1 = pt1a; else pt1 = pt2a;
- if (pt1b.x < pt2b.x) pt2 = pt1b; else pt2 = pt2b;
- return pt1.x < pt2.x;
- } else
- {
- if (pt1a.y < pt1b.y) SwapPoints(pt1a, pt1b);
- if (pt2a.y < pt2b.y) SwapPoints(pt2a, pt2b);
- if (pt1a.y < pt2a.y) pt1 = pt1a; else pt1 = pt2a;
- if (pt1b.y > pt2b.y) pt2 = pt1b; else pt2 = pt2b;
- return pt1.y > pt2.y;
- }
-}
-//------------------------------------------------------------------------------
-
-bool FirstIsBottomPt(const OutPt* btmPt1, const OutPt* btmPt2)
-{
- OutPt *p = btmPt1->Prev;
- while ((p->Pt == btmPt1->Pt) && (p != btmPt1)) p = p->Prev;
- double dx1p = std::fabs(GetDx(btmPt1->Pt, p->Pt));
- p = btmPt1->Next;
- while ((p->Pt == btmPt1->Pt) && (p != btmPt1)) p = p->Next;
- double dx1n = std::fabs(GetDx(btmPt1->Pt, p->Pt));
-
- p = btmPt2->Prev;
- while ((p->Pt == btmPt2->Pt) && (p != btmPt2)) p = p->Prev;
- double dx2p = std::fabs(GetDx(btmPt2->Pt, p->Pt));
- p = btmPt2->Next;
- while ((p->Pt == btmPt2->Pt) && (p != btmPt2)) p = p->Next;
- double dx2n = std::fabs(GetDx(btmPt2->Pt, p->Pt));
-
- if (std::max(dx1p, dx1n) == std::max(dx2p, dx2n) &&
- std::min(dx1p, dx1n) == std::min(dx2p, dx2n))
- return Area(btmPt1) > 0; //if otherwise identical use orientation
- else
- return (dx1p >= dx2p && dx1p >= dx2n) || (dx1n >= dx2p && dx1n >= dx2n);
-}
-//------------------------------------------------------------------------------
-
-OutPt* GetBottomPt(OutPt *pp)
-{
- OutPt* dups = 0;
- OutPt* p = pp->Next;
- while (p != pp)
- {
- if (p->Pt.y > pp->Pt.y)
- {
- pp = p;
- dups = 0;
- }
- else if (p->Pt.y == pp->Pt.y && p->Pt.x <= pp->Pt.x)
- {
- if (p->Pt.x < pp->Pt.x)
- {
- dups = 0;
- pp = p;
- } else
- {
- if (p->Next != pp && p->Prev != pp) dups = p;
- }
- }
- p = p->Next;
- }
- if (dups)
- {
- //there appears to be at least 2 vertices at BottomPt so ...
- while (dups != p)
- {
- if (!FirstIsBottomPt(p, dups)) pp = dups;
- dups = dups->Next;
- while (dups->Pt != pp->Pt) dups = dups->Next;
- }
- }
- return pp;
-}
-//------------------------------------------------------------------------------
-
-bool Pt2IsBetweenPt1AndPt3(const IntPoint pt1,
- const IntPoint pt2, const IntPoint pt3)
-{
- if ((pt1 == pt3) || (pt1 == pt2) || (pt3 == pt2))
- return false;
- else if (pt1.x != pt3.x)
- return (pt2.x > pt1.x) == (pt2.x < pt3.x);
- else
- return (pt2.y > pt1.y) == (pt2.y < pt3.y);
-}
-//------------------------------------------------------------------------------
-
-bool HorzSegmentsOverlap(cInt seg1a, cInt seg1b, cInt seg2a, cInt seg2b)
-{
- if (seg1a > seg1b) std::swap(seg1a, seg1b);
- if (seg2a > seg2b) std::swap(seg2a, seg2b);
- return (seg1a < seg2b) && (seg2a < seg1b);
-}
-
-//------------------------------------------------------------------------------
-// ClipperBase class methods ...
-//------------------------------------------------------------------------------
-
-ClipperBase::ClipperBase() //constructor
-{
- m_CurrentLM = m_MinimaList.begin(); //begin() == end() here
- m_UseFullRange = false;
-}
-//------------------------------------------------------------------------------
-
-ClipperBase::~ClipperBase() //destructor
-{
- Clear();
-}
-//------------------------------------------------------------------------------
-
-void RangeTest(const IntPoint& Pt, bool& useFullRange)
-{
- if (useFullRange)
- {
- if (Pt.x > hiRange || Pt.y > hiRange || -Pt.x > hiRange || -Pt.y > hiRange)
- {
- std::stringstream s;
- s << "Coordinate outside allowed range: ";
- s << std::fixed << Pt.x << " " << Pt.y << " " << -Pt.x << " " << -Pt.y;
- throw clipperException(s.str().c_str());
- }
- }
- else if (Pt.x > loRange|| Pt.y > loRange || -Pt.x > loRange || -Pt.y > loRange)
- {
- useFullRange = true;
- RangeTest(Pt, useFullRange);
- }
-}
-//------------------------------------------------------------------------------
-
-TEdge* FindNextLocMin(TEdge* E)
-{
- for (;;)
- {
- while (E->Bot != E->Prev->Bot || E->Curr == E->Top) E = E->Next;
- if (!IsHorizontal(*E) && !IsHorizontal(*E->Prev)) break;
- while (IsHorizontal(*E->Prev)) E = E->Prev;
- TEdge* E2 = E;
- while (IsHorizontal(*E)) E = E->Next;
- if (E->Top.y == E->Prev->Bot.y) continue; //ie just an intermediate horz.
- if (E2->Prev->Bot.x < E->Bot.x) E = E2;
- break;
- }
- return E;
-}
-//------------------------------------------------------------------------------
-
-TEdge* ClipperBase::ProcessBound(TEdge* E, bool NextIsForward)
-{
- TEdge *Result = E;
- TEdge *Horz = 0;
-
- if (E->OutIdx == Skip)
- {
- //if edges still remain in the current bound beyond the skip edge then
- //create another LocMin and call ProcessBound once more
- if (NextIsForward)
- {
- while (E->Top.y == E->Next->Bot.y) E = E->Next;
- //don't include top horizontals when parsing a bound a second time,
- //they will be contained in the opposite bound ...
- while (E != Result && IsHorizontal(*E)) E = E->Prev;
- }
- else
- {
- while (E->Top.y == E->Prev->Bot.y) E = E->Prev;
- while (E != Result && IsHorizontal(*E)) E = E->Next;
- }
-
- if (E == Result)
- {
- if (NextIsForward) Result = E->Next;
- else Result = E->Prev;
- }
- else
- {
- //there are more edges in the bound beyond result starting with E
- if (NextIsForward)
- E = Result->Next;
- else
- E = Result->Prev;
- MinimaList::value_type locMin;
- locMin.y = E->Bot.y;
- locMin.LeftBound = 0;
- locMin.RightBound = E;
- E->WindDelta = 0;
- Result = ProcessBound(E, NextIsForward);
- m_MinimaList.push_back(locMin);
- }
- return Result;
- }
-
- TEdge *EStart;
-
- if (IsHorizontal(*E))
- {
- //We need to be careful with open paths because this may not be a
- //true local minima (ie E may be following a skip edge).
- //Also, consecutive horz. edges may start heading left before going right.
- if (NextIsForward)
- EStart = E->Prev;
- else
- EStart = E->Next;
- if (IsHorizontal(*EStart)) //ie an adjoining horizontal skip edge
- {
- if (EStart->Bot.x != E->Bot.x && EStart->Top.x != E->Bot.x)
- ReverseHorizontal(*E);
- }
- else if (EStart->Bot.x != E->Bot.x)
- ReverseHorizontal(*E);
- }
-
- EStart = E;
- if (NextIsForward)
- {
- while (Result->Top.y == Result->Next->Bot.y && Result->Next->OutIdx != Skip)
- Result = Result->Next;
- if (IsHorizontal(*Result) && Result->Next->OutIdx != Skip)
- {
- //nb: at the top of a bound, horizontals are added to the bound
- //only when the preceding edge attaches to the horizontal's left vertex
- //unless a Skip edge is encountered when that becomes the top divide
- Horz = Result;
- while (IsHorizontal(*Horz->Prev)) Horz = Horz->Prev;
- if (Horz->Prev->Top.x > Result->Next->Top.x) Result = Horz->Prev;
- }
- while (E != Result)
- {
- E->NextInLML = E->Next;
- if (IsHorizontal(*E) && E != EStart &&
- E->Bot.x != E->Prev->Top.x) ReverseHorizontal(*E);
- E = E->Next;
- }
- if (IsHorizontal(*E) && E != EStart && E->Bot.x != E->Prev->Top.x)
- ReverseHorizontal(*E);
- Result = Result->Next; //move to the edge just beyond current bound
- } else
- {
- while (Result->Top.y == Result->Prev->Bot.y && Result->Prev->OutIdx != Skip)
- Result = Result->Prev;
- if (IsHorizontal(*Result) && Result->Prev->OutIdx != Skip)
- {
- Horz = Result;
- while (IsHorizontal(*Horz->Next)) Horz = Horz->Next;
- if (Horz->Next->Top.x == Result->Prev->Top.x ||
- Horz->Next->Top.x > Result->Prev->Top.x) Result = Horz->Next;
- }
-
- while (E != Result)
- {
- E->NextInLML = E->Prev;
- if (IsHorizontal(*E) && E != EStart && E->Bot.x != E->Next->Top.x)
- ReverseHorizontal(*E);
- E = E->Prev;
- }
- if (IsHorizontal(*E) && E != EStart && E->Bot.x != E->Next->Top.x)
- ReverseHorizontal(*E);
- Result = Result->Prev; //move to the edge just beyond current bound
- }
-
- return Result;
-}
-//------------------------------------------------------------------------------
-
-bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
-{
-#ifdef use_lines
- if (!Closed && PolyTyp == ptClip)
- throw clipperException("AddPath: Open paths must be subject.");
-#else
- if (!Closed)
- throw clipperException("AddPath: Open paths have been disabled.");
-#endif
-
- int highI = (int)pg.size() -1;
- if (Closed) while (highI > 0 && (pg[highI] == pg[0])) --highI;
- while (highI > 0 && (pg[highI] == pg[highI -1])) --highI;
- if ((Closed && highI < 2) || (!Closed && highI < 1)) return false;
-
- //create a new edge array ...
- TEdge *edges = new TEdge [highI +1];
-
- bool IsFlat = true;
- //1. Basic (first) edge initialization ...
- try
- {
- edges[1].Curr = pg[1];
- RangeTest(pg[0], m_UseFullRange);
- RangeTest(pg[highI], m_UseFullRange);
- InitEdge(&edges[0], &edges[1], &edges[highI], pg[0]);
- InitEdge(&edges[highI], &edges[0], &edges[highI-1], pg[highI]);
- for (int i = highI - 1; i >= 1; --i)
- {
- RangeTest(pg[i], m_UseFullRange);
- InitEdge(&edges[i], &edges[i+1], &edges[i-1], pg[i]);
- }
- }
- catch(std::exception const&)
- {
- delete [] edges;
- throw; //range test fails
- }
- TEdge *eStart = &edges[0];
-
- //2. Remove duplicate vertices, and (when closed) collinear edges ...
- TEdge *E = eStart, *eLoopStop = eStart;
- for (;;)
- {
- //nb: allows matching start and end points when not Closed ...
- if (E->Curr == E->Next->Curr && (Closed || E->Next != eStart))
- {
- if (E == E->Next) break;
- if (E == eStart) eStart = E->Next;
- E = RemoveEdge(E);
- eLoopStop = E;
- continue;
- }
- if (E->Prev == E->Next)
- break; //only two vertices
- else if (Closed &&
- SlopesEqual(E->Prev->Curr, E->Curr, E->Next->Curr, m_UseFullRange) &&
- (!m_PreserveCollinear ||
- !Pt2IsBetweenPt1AndPt3(E->Prev->Curr, E->Curr, E->Next->Curr)))
- {
- //Collinear edges are allowed for open paths but in closed paths
- //the default is to merge adjacent collinear edges into a single edge.
- //However, if the PreserveCollinear property is enabled, only overlapping
- //collinear edges (ie spikes) will be removed from closed paths.
- if (E == eStart) eStart = E->Next;
- E = RemoveEdge(E);
- E = E->Prev;
- eLoopStop = E;
- continue;
- }
- E = E->Next;
- if ((E == eLoopStop) || (!Closed && E->Next == eStart)) break;
- }
-
- if ((!Closed && (E == E->Next)) || (Closed && (E->Prev == E->Next)))
- {
- delete [] edges;
- return false;
- }
-
- if (!Closed)
- {
- m_HasOpenPaths = true;
- eStart->Prev->OutIdx = Skip;
- }
-
- //3. Do second stage of edge initialization ...
- E = eStart;
- do
- {
- InitEdge2(*E, PolyTyp);
- E = E->Next;
- if (IsFlat && E->Curr.y != eStart->Curr.y) IsFlat = false;
- }
- while (E != eStart);
-
- //4. Finally, add edge bounds to LocalMinima list ...
-
- //Totally flat paths must be handled differently when adding them
- //to LocalMinima list to avoid endless loops etc ...
- if (IsFlat)
- {
- if (Closed)
- {
- delete [] edges;
- return false;
- }
- E->Prev->OutIdx = Skip;
- MinimaList::value_type locMin;
- locMin.y = E->Bot.y;
- locMin.LeftBound = 0;
- locMin.RightBound = E;
- locMin.RightBound->Side = esRight;
- locMin.RightBound->WindDelta = 0;
- for (;;)
- {
- if (E->Bot.x != E->Prev->Top.x) ReverseHorizontal(*E);
- if (E->Next->OutIdx == Skip) break;
- E->NextInLML = E->Next;
- E = E->Next;
- }
- m_MinimaList.push_back(locMin);
- m_edges.push_back(edges);
- return true;
- }
-
- m_edges.push_back(edges);
- bool leftBoundIsForward;
- TEdge* EMin = 0;
-
- //workaround to avoid an endless loop in the while loop below when
- //open paths have matching start and end points ...
- if (E->Prev->Bot == E->Prev->Top) E = E->Next;
-
- for (;;)
- {
- E = FindNextLocMin(E);
- if (E == EMin) break;
- else if (!EMin) EMin = E;
-
- //E and E.Prev now share a local minima (left aligned if horizontal).
- //Compare their slopes to find which starts which bound ...
- MinimaList::value_type locMin;
- locMin.y = E->Bot.y;
- if (E->Dx < E->Prev->Dx)
- {
- locMin.LeftBound = E->Prev;
- locMin.RightBound = E;
- leftBoundIsForward = false; //Q.nextInLML = Q.prev
- } else
- {
- locMin.LeftBound = E;
- locMin.RightBound = E->Prev;
- leftBoundIsForward = true; //Q.nextInLML = Q.next
- }
-
- if (!Closed) locMin.LeftBound->WindDelta = 0;
- else if (locMin.LeftBound->Next == locMin.RightBound)
- locMin.LeftBound->WindDelta = -1;
- else locMin.LeftBound->WindDelta = 1;
- locMin.RightBound->WindDelta = -locMin.LeftBound->WindDelta;
-
- E = ProcessBound(locMin.LeftBound, leftBoundIsForward);
- if (E->OutIdx == Skip) E = ProcessBound(E, leftBoundIsForward);
-
- TEdge* E2 = ProcessBound(locMin.RightBound, !leftBoundIsForward);
- if (E2->OutIdx == Skip) E2 = ProcessBound(E2, !leftBoundIsForward);
-
- if (locMin.LeftBound->OutIdx == Skip)
- locMin.LeftBound = 0;
- else if (locMin.RightBound->OutIdx == Skip)
- locMin.RightBound = 0;
- m_MinimaList.push_back(locMin);
- if (!leftBoundIsForward) E = E2;
- }
- return true;
-}
-//------------------------------------------------------------------------------
-
-bool ClipperBase::AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed)
-{
- bool result = false;
- for (Paths::size_type i = 0; i < ppg.size(); ++i)
- if (AddPath(ppg[i], PolyTyp, Closed)) result = true;
- return result;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::Clear()
-{
- DisposeLocalMinimaList();
- for (EdgeList::size_type i = 0; i < m_edges.size(); ++i)
- {
- TEdge* edges = m_edges[i];
- delete [] edges;
- }
- m_edges.clear();
- m_UseFullRange = false;
- m_HasOpenPaths = false;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::Reset()
-{
- m_CurrentLM = m_MinimaList.begin();
- if (m_CurrentLM == m_MinimaList.end()) return; //ie nothing to process
- std::stable_sort(m_MinimaList.begin(), m_MinimaList.end(), LocMinSorter());
-
- m_Scanbeam = ScanbeamList(); //clears/resets priority_queue
- //reset all edges ...
- for (MinimaList::iterator lm = m_MinimaList.begin(); lm != m_MinimaList.end(); ++lm)
- {
- InsertScanbeam(lm->y);
- TEdge* e = lm->LeftBound;
- if (e)
- {
- e->Curr = e->Bot;
- e->Side = esLeft;
- e->OutIdx = Unassigned;
- }
-
- e = lm->RightBound;
- if (e)
- {
- e->Curr = e->Bot;
- e->Side = esRight;
- e->OutIdx = Unassigned;
- }
- }
- m_ActiveEdges = 0;
- m_CurrentLM = m_MinimaList.begin();
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::DisposeLocalMinimaList()
-{
- m_MinimaList.clear();
- m_CurrentLM = m_MinimaList.begin();
-}
-//------------------------------------------------------------------------------
-
-bool ClipperBase::PopLocalMinima(cInt Y, const LocalMinimum *&locMin)
-{
- if (m_CurrentLM == m_MinimaList.end() || (*m_CurrentLM).y != Y) return false;
- locMin = &(*m_CurrentLM);
- ++m_CurrentLM;
- return true;
-}
-//------------------------------------------------------------------------------
-
-IntRect ClipperBase::GetBounds()
-{
- IntRect result;
- MinimaList::iterator lm = m_MinimaList.begin();
- if (lm == m_MinimaList.end())
- {
- result.left = result.top = result.right = result.bottom = 0;
- return result;
- }
- result.left = lm->LeftBound->Bot.x;
- result.top = lm->LeftBound->Bot.y;
- result.right = lm->LeftBound->Bot.x;
- result.bottom = lm->LeftBound->Bot.y;
- while (lm != m_MinimaList.end())
- {
- //todo - needs fixing for open paths
- result.bottom = std::max(result.bottom, lm->LeftBound->Bot.y);
- TEdge* e = lm->LeftBound;
- for (;;) {
- TEdge* bottomE = e;
- while (e->NextInLML)
- {
- if (e->Bot.x < result.left) result.left = e->Bot.x;
- if (e->Bot.x > result.right) result.right = e->Bot.x;
- e = e->NextInLML;
- }
- result.left = std::min(result.left, e->Bot.x);
- result.right = std::max(result.right, e->Bot.x);
- result.left = std::min(result.left, e->Top.x);
- result.right = std::max(result.right, e->Top.x);
- result.top = std::min(result.top, e->Top.y);
- if (bottomE == lm->LeftBound) e = lm->RightBound;
- else break;
- }
- ++lm;
- }
- return result;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::InsertScanbeam(const cInt Y)
-{
- m_Scanbeam.push(Y);
-}
-//------------------------------------------------------------------------------
-
-bool ClipperBase::PopScanbeam(cInt &Y)
-{
- if (m_Scanbeam.empty()) return false;
- Y = m_Scanbeam.top();
- m_Scanbeam.pop();
- while (!m_Scanbeam.empty() && Y == m_Scanbeam.top()) { m_Scanbeam.pop(); } // Pop duplicates.
- return true;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::DisposeAllOutRecs(){
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- DisposeOutRec(i);
- m_PolyOuts.clear();
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::DisposeOutRec(PolyOutList::size_type index)
-{
- OutRec *outRec = m_PolyOuts[index];
- if (outRec->Pts) DisposeOutPts(outRec->Pts);
- delete outRec;
- m_PolyOuts[index] = 0;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::DeleteFromAEL(TEdge *e)
-{
- TEdge* AelPrev = e->PrevInAEL;
- TEdge* AelNext = e->NextInAEL;
- if (!AelPrev && !AelNext && (e != m_ActiveEdges)) return; //already deleted
- if (AelPrev) AelPrev->NextInAEL = AelNext;
- else m_ActiveEdges = AelNext;
- if (AelNext) AelNext->PrevInAEL = AelPrev;
- e->NextInAEL = 0;
- e->PrevInAEL = 0;
-}
-//------------------------------------------------------------------------------
-
-OutRec* ClipperBase::CreateOutRec()
-{
- OutRec* result = new OutRec;
- result->IsHole = false;
- result->IsOpen = false;
- result->FirstLeft = 0;
- result->Pts = 0;
- result->BottomPt = 0;
- result->PolyNd = 0;
- m_PolyOuts.push_back(result);
- result->Idx = (int)m_PolyOuts.size() - 1;
- return result;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::SwapPositionsInAEL(TEdge *Edge1, TEdge *Edge2)
-{
- //check that one or other edge hasn't already been removed from AEL ...
- if (Edge1->NextInAEL == Edge1->PrevInAEL ||
- Edge2->NextInAEL == Edge2->PrevInAEL) return;
-
- if (Edge1->NextInAEL == Edge2)
- {
- TEdge* Next = Edge2->NextInAEL;
- if (Next) Next->PrevInAEL = Edge1;
- TEdge* Prev = Edge1->PrevInAEL;
- if (Prev) Prev->NextInAEL = Edge2;
- Edge2->PrevInAEL = Prev;
- Edge2->NextInAEL = Edge1;
- Edge1->PrevInAEL = Edge2;
- Edge1->NextInAEL = Next;
- }
- else if (Edge2->NextInAEL == Edge1)
- {
- TEdge* Next = Edge1->NextInAEL;
- if (Next) Next->PrevInAEL = Edge2;
- TEdge* Prev = Edge2->PrevInAEL;
- if (Prev) Prev->NextInAEL = Edge1;
- Edge1->PrevInAEL = Prev;
- Edge1->NextInAEL = Edge2;
- Edge2->PrevInAEL = Edge1;
- Edge2->NextInAEL = Next;
- }
- else
- {
- TEdge* Next = Edge1->NextInAEL;
- TEdge* Prev = Edge1->PrevInAEL;
- Edge1->NextInAEL = Edge2->NextInAEL;
- if (Edge1->NextInAEL) Edge1->NextInAEL->PrevInAEL = Edge1;
- Edge1->PrevInAEL = Edge2->PrevInAEL;
- if (Edge1->PrevInAEL) Edge1->PrevInAEL->NextInAEL = Edge1;
- Edge2->NextInAEL = Next;
- if (Edge2->NextInAEL) Edge2->NextInAEL->PrevInAEL = Edge2;
- Edge2->PrevInAEL = Prev;
- if (Edge2->PrevInAEL) Edge2->PrevInAEL->NextInAEL = Edge2;
- }
-
- if (!Edge1->PrevInAEL) m_ActiveEdges = Edge1;
- else if (!Edge2->PrevInAEL) m_ActiveEdges = Edge2;
-}
-//------------------------------------------------------------------------------
-
-void ClipperBase::UpdateEdgeIntoAEL(TEdge *&e)
-{
- if (!e->NextInLML)
- throw clipperException("UpdateEdgeIntoAEL: invalid call");
-
- e->NextInLML->OutIdx = e->OutIdx;
- TEdge* AelPrev = e->PrevInAEL;
- TEdge* AelNext = e->NextInAEL;
- if (AelPrev) AelPrev->NextInAEL = e->NextInLML;
- else m_ActiveEdges = e->NextInLML;
- if (AelNext) AelNext->PrevInAEL = e->NextInLML;
- e->NextInLML->Side = e->Side;
- e->NextInLML->WindDelta = e->WindDelta;
- e->NextInLML->WindCnt = e->WindCnt;
- e->NextInLML->WindCnt2 = e->WindCnt2;
- e = e->NextInLML;
- e->Curr = e->Bot;
- e->PrevInAEL = AelPrev;
- e->NextInAEL = AelNext;
- if (!IsHorizontal(*e)) InsertScanbeam(e->Top.y);
-}
-//------------------------------------------------------------------------------
-
-bool ClipperBase::LocalMinimaPending()
-{
- return (m_CurrentLM != m_MinimaList.end());
-}
-
-//------------------------------------------------------------------------------
-// TClipper methods ...
-//------------------------------------------------------------------------------
-
-Clipper::Clipper(int initOptions) : ClipperBase() //constructor
-{
- m_ExecuteLocked = false;
- m_UseFullRange = false;
- m_ReverseOutput = ((initOptions & ioReverseSolution) != 0);
- m_StrictSimple = ((initOptions & ioStrictlySimple) != 0);
- m_PreserveCollinear = ((initOptions & ioPreserveCollinear) != 0);
- m_HasOpenPaths = false;
-#ifdef use_xyz
- m_ZFill = 0;
-#endif
-}
-//------------------------------------------------------------------------------
-
-#ifdef use_xyz
-void Clipper::ZFillFunction(ZFillCallback zFillFunc)
-{
- m_ZFill = zFillFunc;
-}
-//------------------------------------------------------------------------------
-#endif
-
-bool Clipper::Execute(ClipType clipType, Paths &solution, PolyFillType fillType)
-{
- return Execute(clipType, solution, fillType, fillType);
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::Execute(ClipType clipType, PolyTree &polytree, PolyFillType fillType)
-{
- return Execute(clipType, polytree, fillType, fillType);
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::Execute(ClipType clipType, Paths &solution,
- PolyFillType subjFillType, PolyFillType clipFillType)
-{
- if( m_ExecuteLocked ) return false;
- if (m_HasOpenPaths)
- throw clipperException("Error: PolyTree struct is needed for open path clipping.");
- m_ExecuteLocked = true;
- solution.resize(0);
- m_SubjFillType = subjFillType;
- m_ClipFillType = clipFillType;
- m_ClipType = clipType;
- m_UsingPolyTree = false;
- bool succeeded = ExecuteInternal();
- if (succeeded) BuildResult(solution);
- DisposeAllOutRecs();
- m_ExecuteLocked = false;
- return succeeded;
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::Execute(ClipType clipType, PolyTree& polytree,
- PolyFillType subjFillType, PolyFillType clipFillType)
-{
- if( m_ExecuteLocked ) return false;
- m_ExecuteLocked = true;
- m_SubjFillType = subjFillType;
- m_ClipFillType = clipFillType;
- m_ClipType = clipType;
- m_UsingPolyTree = true;
- bool succeeded = ExecuteInternal();
- if (succeeded) BuildResult2(polytree);
- DisposeAllOutRecs();
- m_ExecuteLocked = false;
- return succeeded;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::FixHoleLinkage(OutRec &outrec)
-{
- //skip OutRecs that (a) contain outermost polygons or
- //(b) already have the correct owner/child linkage ...
- if (!outrec.FirstLeft ||
- (outrec.IsHole != outrec.FirstLeft->IsHole &&
- outrec.FirstLeft->Pts)) return;
-
- OutRec* orfl = outrec.FirstLeft;
- while (orfl && ((orfl->IsHole == outrec.IsHole) || !orfl->Pts))
- orfl = orfl->FirstLeft;
- outrec.FirstLeft = orfl;
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::ExecuteInternal()
-{
- bool succeeded = true;
- try {
- Reset();
- m_Maxima = MaximaList();
- m_SortedEdges = 0;
-
- succeeded = true;
- cInt botY, topY;
- if (!PopScanbeam(botY)) return false;
- InsertLocalMinimaIntoAEL(botY);
- while (PopScanbeam(topY) || LocalMinimaPending())
- {
- ProcessHorizontals();
- ClearGhostJoins();
- if (!ProcessIntersections(topY))
- {
- succeeded = false;
- break;
- }
- ProcessEdgesAtTopOfScanbeam(topY);
- botY = topY;
- InsertLocalMinimaIntoAEL(botY);
- }
- }
- catch(std::exception const&)
- {
- succeeded = false;
- }
-
- if (succeeded)
- {
- //fix orientations ...
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- OutRec *outRec = m_PolyOuts[i];
- if (!outRec->Pts || outRec->IsOpen) continue;
- if ((outRec->IsHole ^ m_ReverseOutput) == (Area(*outRec) > 0))
- ReversePolyPtLinks(outRec->Pts);
- }
-
- if (!m_Joins.empty()) JoinCommonEdges();
-
- //unfortunately FixupOutPolygon() must be done after JoinCommonEdges()
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- OutRec *outRec = m_PolyOuts[i];
- if (!outRec->Pts) continue;
- if (outRec->IsOpen)
- FixupOutPolyline(*outRec);
- else
- FixupOutPolygon(*outRec);
- }
-
- if (m_StrictSimple)
- {
- DoSimplePolygons();
- m_StrictSimple = false;
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- OutRec *outRec = m_PolyOuts[i];
- if (!outRec->Pts || outRec->IsOpen)
- {
- continue;
- }
- FixupOutPolygon(*outRec);
- }
- m_StrictSimple = true;
- }
- }
-
- ClearJoins();
- ClearGhostJoins();
- return succeeded;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::SetWindingCount(TEdge &edge)
-{
- TEdge *e = edge.PrevInAEL;
- //find the edge of the same polytype that immediately preceeds 'edge' in AEL
- while (e && ((e->PolyTyp != edge.PolyTyp) || (e->WindDelta == 0))) e = e->PrevInAEL;
- if (!e)
- {
- if (edge.WindDelta == 0)
- {
- PolyFillType pft = (edge.PolyTyp == ptSubject ? m_SubjFillType : m_ClipFillType);
- edge.WindCnt = (pft == pftNegative ? -1 : 1);
- }
- else
- edge.WindCnt = edge.WindDelta;
- edge.WindCnt2 = 0;
- e = m_ActiveEdges; //ie get ready to calc WindCnt2
- }
- else if (edge.WindDelta == 0 && m_ClipType != ctUnion)
- {
- edge.WindCnt = 1;
- edge.WindCnt2 = e->WindCnt2;
- e = e->NextInAEL; //ie get ready to calc WindCnt2
- }
- else if (IsEvenOddFillType(edge))
- {
- //EvenOdd filling ...
- if (edge.WindDelta == 0)
- {
- //are we inside a subj polygon ...
- bool Inside = true;
- TEdge *e2 = e->PrevInAEL;
- while (e2)
- {
- if (e2->PolyTyp == e->PolyTyp && e2->WindDelta != 0)
- Inside = !Inside;
- e2 = e2->PrevInAEL;
- }
- edge.WindCnt = (Inside ? 0 : 1);
- }
- else
- {
- edge.WindCnt = edge.WindDelta;
- }
- edge.WindCnt2 = e->WindCnt2;
- e = e->NextInAEL; //ie get ready to calc WindCnt2
- }
- else
- {
- //nonZero, Positive or Negative filling ...
- if (e->WindCnt * e->WindDelta < 0)
- {
- //prev edge is 'decreasing' WindCount (WC) toward zero
- //so we're outside the previous polygon ...
- if (Abs(e->WindCnt) > 1)
- {
- //outside prev poly but still inside another.
- //when reversing direction of prev poly use the same WC
- if (e->WindDelta * edge.WindDelta < 0) edge.WindCnt = e->WindCnt;
- //otherwise continue to 'decrease' WC ...
- else edge.WindCnt = e->WindCnt + edge.WindDelta;
- }
- else
- //now outside all polys of same polytype so set own WC ...
- edge.WindCnt = (edge.WindDelta == 0 ? 1 : edge.WindDelta);
- } else
- {
- //prev edge is 'increasing' WindCount (WC) away from zero
- //so we're inside the previous polygon ...
- if (edge.WindDelta == 0)
- edge.WindCnt = (e->WindCnt < 0 ? e->WindCnt - 1 : e->WindCnt + 1);
- //if wind direction is reversing prev then use same WC
- else if (e->WindDelta * edge.WindDelta < 0) edge.WindCnt = e->WindCnt;
- //otherwise add to WC ...
- else edge.WindCnt = e->WindCnt + edge.WindDelta;
- }
- edge.WindCnt2 = e->WindCnt2;
- e = e->NextInAEL; //ie get ready to calc WindCnt2
- }
-
- //update WindCnt2 ...
- if (IsEvenOddAltFillType(edge))
- {
- //EvenOdd filling ...
- while (e != &edge)
- {
- if (e->WindDelta != 0)
- edge.WindCnt2 = (edge.WindCnt2 == 0 ? 1 : 0);
- e = e->NextInAEL;
- }
- } else
- {
- //nonZero, Positive or Negative filling ...
- while ( e != &edge )
- {
- edge.WindCnt2 += e->WindDelta;
- e = e->NextInAEL;
- }
- }
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::IsEvenOddFillType(const TEdge& edge) const
-{
- if (edge.PolyTyp == ptSubject)
- return m_SubjFillType == pftEvenOdd; else
- return m_ClipFillType == pftEvenOdd;
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::IsEvenOddAltFillType(const TEdge& edge) const
-{
- if (edge.PolyTyp == ptSubject)
- return m_ClipFillType == pftEvenOdd; else
- return m_SubjFillType == pftEvenOdd;
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::IsContributing(const TEdge& edge) const
-{
- PolyFillType pft, pft2;
- if (edge.PolyTyp == ptSubject)
- {
- pft = m_SubjFillType;
- pft2 = m_ClipFillType;
- } else
- {
- pft = m_ClipFillType;
- pft2 = m_SubjFillType;
- }
-
- switch(pft)
- {
- case pftEvenOdd:
- //return false if a subj line has been flagged as inside a subj polygon
- if (edge.WindDelta == 0 && edge.WindCnt != 1) return false;
- break;
- case pftNonZero:
- if (Abs(edge.WindCnt) != 1) return false;
- break;
- case pftPositive:
- if (edge.WindCnt != 1) return false;
- break;
- default: //pftNegative
- if (edge.WindCnt != -1) return false;
- }
-
- switch(m_ClipType)
- {
- case ctIntersection:
- switch(pft2)
- {
- case pftEvenOdd:
- case pftNonZero:
- return (edge.WindCnt2 != 0);
- case pftPositive:
- return (edge.WindCnt2 > 0);
- default:
- return (edge.WindCnt2 < 0);
- }
- break;
- case ctUnion:
- switch(pft2)
- {
- case pftEvenOdd:
- case pftNonZero:
- return (edge.WindCnt2 == 0);
- case pftPositive:
- return (edge.WindCnt2 <= 0);
- default:
- return (edge.WindCnt2 >= 0);
- }
- break;
- case ctDifference:
- if (edge.PolyTyp == ptSubject)
- switch(pft2)
- {
- case pftEvenOdd:
- case pftNonZero:
- return (edge.WindCnt2 == 0);
- case pftPositive:
- return (edge.WindCnt2 <= 0);
- default:
- return (edge.WindCnt2 >= 0);
- }
- else
- switch(pft2)
- {
- case pftEvenOdd:
- case pftNonZero:
- return (edge.WindCnt2 != 0);
- case pftPositive:
- return (edge.WindCnt2 > 0);
- default:
- return (edge.WindCnt2 < 0);
- }
- break;
- case ctXor:
- if (edge.WindDelta == 0) //XOr always contributing unless open
- switch(pft2)
- {
- case pftEvenOdd:
- case pftNonZero:
- return (edge.WindCnt2 == 0);
- case pftPositive:
- return (edge.WindCnt2 <= 0);
- default:
- return (edge.WindCnt2 >= 0);
- }
- else
- return true;
- break;
- default:
- return true;
- }
-}
-//------------------------------------------------------------------------------
-
-OutPt* Clipper::AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &Pt)
-{
- OutPt* result;
- TEdge *e, *prevE;
- if (IsHorizontal(*e2) || ( e1->Dx > e2->Dx ))
- {
- result = AddOutPt(e1, Pt);
- e2->OutIdx = e1->OutIdx;
- e1->Side = esLeft;
- e2->Side = esRight;
- e = e1;
- if (e->PrevInAEL == e2)
- prevE = e2->PrevInAEL;
- else
- prevE = e->PrevInAEL;
- } else
- {
- result = AddOutPt(e2, Pt);
- e1->OutIdx = e2->OutIdx;
- e1->Side = esRight;
- e2->Side = esLeft;
- e = e2;
- if (e->PrevInAEL == e1)
- prevE = e1->PrevInAEL;
- else
- prevE = e->PrevInAEL;
- }
-
- if (prevE && prevE->OutIdx >= 0)
- {
- cInt xPrev = TopX(*prevE, Pt.y);
- cInt xE = TopX(*e, Pt.y);
- if (xPrev == xE && (e->WindDelta != 0) && (prevE->WindDelta != 0) &&
- SlopesEqual(IntPoint(xPrev, Pt.y), prevE->Top, IntPoint(xE, Pt.y), e->Top, m_UseFullRange))
- {
- OutPt* outPt = AddOutPt(prevE, Pt);
- AddJoin(result, outPt, e->Top);
- }
- }
- return result;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &Pt)
-{
- AddOutPt( e1, Pt );
- if (e2->WindDelta == 0) AddOutPt(e2, Pt);
- if( e1->OutIdx == e2->OutIdx )
- {
- e1->OutIdx = Unassigned;
- e2->OutIdx = Unassigned;
- }
- else if (e1->OutIdx < e2->OutIdx)
- AppendPolygon(e1, e2);
- else
- AppendPolygon(e2, e1);
-}
-//------------------------------------------------------------------------------
-
-void Clipper::AddEdgeToSEL(TEdge *edge)
-{
- //SEL pointers in PEdge are reused to build a list of horizontal edges.
- //However, we don't need to worry about order with horizontal edge processing.
- if( !m_SortedEdges )
- {
- m_SortedEdges = edge;
- edge->PrevInSEL = 0;
- edge->NextInSEL = 0;
- }
- else
- {
- edge->NextInSEL = m_SortedEdges;
- edge->PrevInSEL = 0;
- m_SortedEdges->PrevInSEL = edge;
- m_SortedEdges = edge;
- }
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::PopEdgeFromSEL(TEdge *&edge)
-{
- if (!m_SortedEdges) return false;
- edge = m_SortedEdges;
- DeleteFromSEL(m_SortedEdges);
- return true;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::CopyAELToSEL()
-{
- TEdge* e = m_ActiveEdges;
- m_SortedEdges = e;
- while ( e )
- {
- e->PrevInSEL = e->PrevInAEL;
- e->NextInSEL = e->NextInAEL;
- e = e->NextInAEL;
- }
-}
-//------------------------------------------------------------------------------
-
-void Clipper::AddJoin(OutPt *op1, OutPt *op2, const IntPoint OffPt)
-{
- Join* j = new Join;
- j->OutPt1 = op1;
- j->OutPt2 = op2;
- j->OffPt = OffPt;
- m_Joins.push_back(j);
-}
-//------------------------------------------------------------------------------
-
-void Clipper::ClearJoins()
-{
- for (JoinList::size_type i = 0; i < m_Joins.size(); i++)
- delete m_Joins[i];
- m_Joins.resize(0);
-}
-//------------------------------------------------------------------------------
-
-void Clipper::ClearGhostJoins()
-{
- for (JoinList::size_type i = 0; i < m_GhostJoins.size(); i++)
- delete m_GhostJoins[i];
- m_GhostJoins.resize(0);
-}
-//------------------------------------------------------------------------------
-
-void Clipper::AddGhostJoin(OutPt *op, const IntPoint OffPt)
-{
- Join* j = new Join;
- j->OutPt1 = op;
- j->OutPt2 = 0;
- j->OffPt = OffPt;
- m_GhostJoins.push_back(j);
-}
-//------------------------------------------------------------------------------
-
-void Clipper::InsertLocalMinimaIntoAEL(const cInt botY)
-{
- const LocalMinimum *lm;
- while (PopLocalMinima(botY, lm))
- {
- TEdge* lb = lm->LeftBound;
- TEdge* rb = lm->RightBound;
-
- OutPt *Op1 = 0;
- if (!lb)
- {
- //nb: don't insert LB into either AEL or SEL
- InsertEdgeIntoAEL(rb, 0);
- SetWindingCount(*rb);
- if (IsContributing(*rb))
- {
- Op1 = AddOutPt(rb, rb->Bot);
- TEdge* ePrev = rb->PrevInAEL;
- if ((rb->OutIdx >= 0) && (rb->WindDelta != 0) && ePrev && (ePrev->OutIdx >= 0) &&
- (ePrev->Curr.x == rb->Curr.x) && (ePrev->WindDelta != 0))
- {
- IntPoint pt = rb->Curr;
- AddOutPt(ePrev, pt);
- }
- TEdge* eNext = rb->NextInAEL;
- if ((rb->OutIdx >= 0) && (rb->WindDelta != 0) && eNext && (eNext->OutIdx >= 0) &&
- (eNext->Curr.x == rb->Curr.x) && (eNext->WindDelta != 0))
- {
- IntPoint pt = rb->Curr;
- AddOutPt(eNext, pt);
- }
- }
- }
- else if (!rb)
- {
- InsertEdgeIntoAEL(lb, 0);
- SetWindingCount(*lb);
- if (IsContributing(*lb))
- {
- Op1 = AddOutPt(lb, lb->Bot);
- TEdge* ePrev = lb->PrevInAEL;
- if ((lb->OutIdx >= 0) && (lb->WindDelta != 0) && ePrev && (ePrev->OutIdx >= 0) &&
- (ePrev->Curr.x == lb->Curr.x) && (ePrev->WindDelta != 0))
- {
- IntPoint pt = lb->Curr;
- AddOutPt(ePrev, pt);
- }
- TEdge* eNext = lb->NextInAEL;
- if ((lb->OutIdx >= 0) && (lb->WindDelta != 0) && eNext && (eNext->OutIdx >= 0) &&
- (eNext->Curr.x == lb->Curr.x) && (eNext->WindDelta != 0))
- {
- IntPoint pt = lb->Curr;
- AddOutPt(eNext, pt);
- }
- }
- InsertScanbeam(lb->Top.y);
- }
- else
- {
- InsertEdgeIntoAEL(lb, 0);
- InsertEdgeIntoAEL(rb, lb);
- SetWindingCount( *lb );
- rb->WindCnt = lb->WindCnt;
- rb->WindCnt2 = lb->WindCnt2;
- if (IsContributing(*lb))
- {
- Op1 = AddLocalMinPoly(lb, rb, lb->Bot);
- TEdge* ePrev = lb->PrevInAEL;
- if ((lb->OutIdx >= 0) && (lb->WindDelta != 0) && ePrev && (ePrev->OutIdx >= 0) &&
- (ePrev->Curr.x == lb->Curr.x) && (ePrev->WindDelta != 0))
- {
- IntPoint pt = lb->Curr;
- AddOutPt(ePrev, pt);
- }
- TEdge* eNext = rb->NextInAEL;
- if ((rb->OutIdx >= 0) && (rb->WindDelta != 0) && eNext && (eNext->OutIdx >= 0) &&
- (eNext->Curr.x == rb->Curr.x) && (eNext->WindDelta != 0))
- {
- IntPoint pt = rb->Curr;
- AddOutPt(eNext, pt);
- }
- }
- InsertScanbeam(lb->Top.y);
- }
-
- if (rb)
- {
- if (IsHorizontal(*rb))
- {
- AddEdgeToSEL(rb);
- if (rb->NextInLML)
- InsertScanbeam(rb->NextInLML->Top.y);
- }
- else InsertScanbeam( rb->Top.y );
- }
-
- if (!lb || !rb) continue;
-
- //if any output polygons share an edge, they'll need joining later ...
- if (Op1 && IsHorizontal(*rb) &&
- !m_GhostJoins.empty() && (rb->WindDelta != 0))
- {
- for (JoinList::size_type i = 0; i < m_GhostJoins.size(); ++i)
- {
- Join* jr = m_GhostJoins[i];
- //if the horizontal Rb and a 'ghost' horizontal overlap, then convert
- //the 'ghost' join to a real join ready for later ...
- if (HorzSegmentsOverlap(jr->OutPt1->Pt.x, jr->OffPt.x, rb->Bot.x, rb->Top.x))
- AddJoin(jr->OutPt1, Op1, jr->OffPt);
- }
- }
-
- if (lb->OutIdx >= 0 && lb->PrevInAEL &&
- lb->PrevInAEL->Curr.x == lb->Bot.x &&
- lb->PrevInAEL->OutIdx >= 0 &&
- SlopesEqual(lb->PrevInAEL->Bot, lb->PrevInAEL->Top, lb->Curr, lb->Top, m_UseFullRange) &&
- (lb->WindDelta != 0) && (lb->PrevInAEL->WindDelta != 0))
- {
- OutPt *Op2 = AddOutPt(lb->PrevInAEL, lb->Bot);
- AddJoin(Op1, Op2, lb->Top);
- }
-
- if(lb->NextInAEL != rb)
- {
-
- if (rb->OutIdx >= 0 && rb->PrevInAEL->OutIdx >= 0 &&
- SlopesEqual(rb->PrevInAEL->Curr, rb->PrevInAEL->Top, rb->Curr, rb->Top, m_UseFullRange) &&
- (rb->WindDelta != 0) && (rb->PrevInAEL->WindDelta != 0))
- {
- OutPt *Op2 = AddOutPt(rb->PrevInAEL, rb->Bot);
- AddJoin(Op1, Op2, rb->Top);
- }
-
- TEdge* e = lb->NextInAEL;
- if (e)
- {
- while( e != rb )
- {
- //nb: For calculating winding counts etc, IntersectEdges() assumes
- //that param1 will be to the Right of param2 ABOVE the intersection ...
- IntersectEdges(rb , e , lb->Curr); //order important here
- e = e->NextInAEL;
- }
- }
- }
-
- }
-}
-//------------------------------------------------------------------------------
-
-void Clipper::DeleteFromSEL(TEdge *e)
-{
- TEdge* SelPrev = e->PrevInSEL;
- TEdge* SelNext = e->NextInSEL;
- if( !SelPrev && !SelNext && (e != m_SortedEdges) ) return; //already deleted
- if( SelPrev ) SelPrev->NextInSEL = SelNext;
- else m_SortedEdges = SelNext;
- if( SelNext ) SelNext->PrevInSEL = SelPrev;
- e->NextInSEL = 0;
- e->PrevInSEL = 0;
-}
-//------------------------------------------------------------------------------
-
-#ifdef use_xyz
-void Clipper::SetZ(IntPoint& pt, TEdge& e1, TEdge& e2)
-{
- if (pt.Z != 0 || !m_ZFill) return;
- else if (pt == e1.Bot) pt.Z = e1.Bot.Z;
- else if (pt == e1.Top) pt.Z = e1.Top.Z;
- else if (pt == e2.Bot) pt.Z = e2.Bot.Z;
- else if (pt == e2.Top) pt.Z = e2.Top.Z;
- else (*m_ZFill)(e1.Bot, e1.Top, e2.Bot, e2.Top, pt);
-}
-//------------------------------------------------------------------------------
-#endif
-
-void Clipper::IntersectEdges(TEdge *e1, TEdge *e2, IntPoint &Pt)
-{
- bool e1Contributing = ( e1->OutIdx >= 0 );
- bool e2Contributing = ( e2->OutIdx >= 0 );
-
-#ifdef use_xyz
- SetZ(Pt, *e1, *e2);
-#endif
-
-#ifdef use_lines
- //if either edge is on an OPEN path ...
- if (e1->WindDelta == 0 || e2->WindDelta == 0)
- {
- //ignore subject-subject open path intersections UNLESS they
- //are both open paths, AND they are both 'contributing maximas' ...
- if (e1->WindDelta == 0 && e2->WindDelta == 0) return;
-
- //if intersecting a subj line with a subj poly ...
- else if (e1->PolyTyp == e2->PolyTyp &&
- e1->WindDelta != e2->WindDelta && m_ClipType == ctUnion)
- {
- if (e1->WindDelta == 0)
- {
- if (e2Contributing)
- {
- AddOutPt(e1, Pt);
- if (e1Contributing) e1->OutIdx = Unassigned;
- }
- }
- else
- {
- if (e1Contributing)
- {
- AddOutPt(e2, Pt);
- if (e2Contributing) e2->OutIdx = Unassigned;
- }
- }
- }
- else if (e1->PolyTyp != e2->PolyTyp)
- {
- //toggle subj open path OutIdx on/off when Abs(clip.WndCnt) == 1 ...
- if ((e1->WindDelta == 0) && abs(e2->WindCnt) == 1 &&
- (m_ClipType != ctUnion || e2->WindCnt2 == 0))
- {
- AddOutPt(e1, Pt);
- if (e1Contributing) e1->OutIdx = Unassigned;
- }
- else if ((e2->WindDelta == 0) && (abs(e1->WindCnt) == 1) &&
- (m_ClipType != ctUnion || e1->WindCnt2 == 0))
- {
- AddOutPt(e2, Pt);
- if (e2Contributing) e2->OutIdx = Unassigned;
- }
- }
- return;
- }
-#endif
-
- //update winding counts...
- //assumes that e1 will be to the Right of e2 ABOVE the intersection
- if ( e1->PolyTyp == e2->PolyTyp )
- {
- if ( IsEvenOddFillType( *e1) )
- {
- int oldE1WindCnt = e1->WindCnt;
- e1->WindCnt = e2->WindCnt;
- e2->WindCnt = oldE1WindCnt;
- } else
- {
- if (e1->WindCnt + e2->WindDelta == 0 ) e1->WindCnt = -e1->WindCnt;
- else e1->WindCnt += e2->WindDelta;
- if ( e2->WindCnt - e1->WindDelta == 0 ) e2->WindCnt = -e2->WindCnt;
- else e2->WindCnt -= e1->WindDelta;
- }
- } else
- {
- if (!IsEvenOddFillType(*e2)) e1->WindCnt2 += e2->WindDelta;
- else e1->WindCnt2 = ( e1->WindCnt2 == 0 ) ? 1 : 0;
- if (!IsEvenOddFillType(*e1)) e2->WindCnt2 -= e1->WindDelta;
- else e2->WindCnt2 = ( e2->WindCnt2 == 0 ) ? 1 : 0;
- }
-
- PolyFillType e1FillType, e2FillType, e1FillType2, e2FillType2;
- if (e1->PolyTyp == ptSubject)
- {
- e1FillType = m_SubjFillType;
- e1FillType2 = m_ClipFillType;
- } else
- {
- e1FillType = m_ClipFillType;
- e1FillType2 = m_SubjFillType;
- }
- if (e2->PolyTyp == ptSubject)
- {
- e2FillType = m_SubjFillType;
- e2FillType2 = m_ClipFillType;
- } else
- {
- e2FillType = m_ClipFillType;
- e2FillType2 = m_SubjFillType;
- }
-
- cInt e1Wc, e2Wc;
- switch (e1FillType)
- {
- case pftPositive: e1Wc = e1->WindCnt; break;
- case pftNegative: e1Wc = -e1->WindCnt; break;
- default: e1Wc = Abs(e1->WindCnt);
- }
- switch(e2FillType)
- {
- case pftPositive: e2Wc = e2->WindCnt; break;
- case pftNegative: e2Wc = -e2->WindCnt; break;
- default: e2Wc = Abs(e2->WindCnt);
- }
-
- if ( e1Contributing && e2Contributing )
- {
- if ((e1Wc != 0 && e1Wc != 1) || (e2Wc != 0 && e2Wc != 1) ||
- (e1->PolyTyp != e2->PolyTyp && m_ClipType != ctXor) )
- {
- AddLocalMaxPoly(e1, e2, Pt);
- }
- else
- {
- AddOutPt(e1, Pt);
- AddOutPt(e2, Pt);
- SwapSides( *e1 , *e2 );
- SwapPolyIndexes( *e1 , *e2 );
- }
- }
- else if ( e1Contributing )
- {
- if (e2Wc == 0 || e2Wc == 1)
- {
- AddOutPt(e1, Pt);
- SwapSides(*e1, *e2);
- SwapPolyIndexes(*e1, *e2);
- }
- }
- else if ( e2Contributing )
- {
- if (e1Wc == 0 || e1Wc == 1)
- {
- AddOutPt(e2, Pt);
- SwapSides(*e1, *e2);
- SwapPolyIndexes(*e1, *e2);
- }
- }
- else if ( (e1Wc == 0 || e1Wc == 1) && (e2Wc == 0 || e2Wc == 1))
- {
- //neither edge is currently contributing ...
-
- cInt e1Wc2, e2Wc2;
- switch (e1FillType2)
- {
- case pftPositive: e1Wc2 = e1->WindCnt2; break;
- case pftNegative : e1Wc2 = -e1->WindCnt2; break;
- default: e1Wc2 = Abs(e1->WindCnt2);
- }
- switch (e2FillType2)
- {
- case pftPositive: e2Wc2 = e2->WindCnt2; break;
- case pftNegative: e2Wc2 = -e2->WindCnt2; break;
- default: e2Wc2 = Abs(e2->WindCnt2);
- }
-
- if (e1->PolyTyp != e2->PolyTyp)
- {
- AddLocalMinPoly(e1, e2, Pt);
- }
- else if (e1Wc == 1 && e2Wc == 1)
- switch( m_ClipType ) {
- case ctIntersection:
- if (e1Wc2 > 0 && e2Wc2 > 0)
- AddLocalMinPoly(e1, e2, Pt);
- break;
- case ctUnion:
- if ( e1Wc2 <= 0 && e2Wc2 <= 0 )
- AddLocalMinPoly(e1, e2, Pt);
- break;
- case ctDifference:
- if (((e1->PolyTyp == ptClip) && (e1Wc2 > 0) && (e2Wc2 > 0)) ||
- ((e1->PolyTyp == ptSubject) && (e1Wc2 <= 0) && (e2Wc2 <= 0)))
- AddLocalMinPoly(e1, e2, Pt);
- break;
- case ctXor:
- AddLocalMinPoly(e1, e2, Pt);
- }
- else
- SwapSides( *e1, *e2 );
- }
-}
-//------------------------------------------------------------------------------
-
-void Clipper::SetHoleState(TEdge *e, OutRec *outrec)
-{
- TEdge *e2 = e->PrevInAEL;
- TEdge *eTmp = 0;
- while (e2)
- {
- if (e2->OutIdx >= 0 && e2->WindDelta != 0)
- {
- if (!eTmp) eTmp = e2;
- else if (eTmp->OutIdx == e2->OutIdx) eTmp = 0;
- }
- e2 = e2->PrevInAEL;
- }
- if (!eTmp)
- {
- outrec->FirstLeft = 0;
- outrec->IsHole = false;
- }
- else
- {
- outrec->FirstLeft = m_PolyOuts[eTmp->OutIdx];
- outrec->IsHole = !outrec->FirstLeft->IsHole;
- }
-}
-//------------------------------------------------------------------------------
-
-OutRec* GetLowermostRec(OutRec *outRec1, OutRec *outRec2)
-{
- //work out which polygon fragment has the correct hole state ...
- if (!outRec1->BottomPt)
- outRec1->BottomPt = GetBottomPt(outRec1->Pts);
- if (!outRec2->BottomPt)
- outRec2->BottomPt = GetBottomPt(outRec2->Pts);
- OutPt *OutPt1 = outRec1->BottomPt;
- OutPt *OutPt2 = outRec2->BottomPt;
- if (OutPt1->Pt.y > OutPt2->Pt.y) return outRec1;
- else if (OutPt1->Pt.y < OutPt2->Pt.y) return outRec2;
- else if (OutPt1->Pt.x < OutPt2->Pt.x) return outRec1;
- else if (OutPt1->Pt.x > OutPt2->Pt.x) return outRec2;
- else if (OutPt1->Next == OutPt1) return outRec2;
- else if (OutPt2->Next == OutPt2) return outRec1;
- else if (FirstIsBottomPt(OutPt1, OutPt2)) return outRec1;
- else return outRec2;
-}
-//------------------------------------------------------------------------------
-
-bool OutRec1RightOfOutRec2(OutRec* outRec1, OutRec* outRec2)
-{
- do
- {
- outRec1 = outRec1->FirstLeft;
- if (outRec1 == outRec2) return true;
- } while (outRec1);
- return false;
-}
-//------------------------------------------------------------------------------
-
-OutRec* Clipper::GetOutRec(int Idx)
-{
- OutRec* outrec = m_PolyOuts[Idx];
- while (outrec != m_PolyOuts[outrec->Idx])
- outrec = m_PolyOuts[outrec->Idx];
- return outrec;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::AppendPolygon(TEdge *e1, TEdge *e2)
-{
- //get the start and ends of both output polygons ...
- OutRec *outRec1 = m_PolyOuts[e1->OutIdx];
- OutRec *outRec2 = m_PolyOuts[e2->OutIdx];
-
- OutRec *holeStateRec;
- if (OutRec1RightOfOutRec2(outRec1, outRec2))
- holeStateRec = outRec2;
- else if (OutRec1RightOfOutRec2(outRec2, outRec1))
- holeStateRec = outRec1;
- else
- holeStateRec = GetLowermostRec(outRec1, outRec2);
-
- //get the start and ends of both output polygons and
- //join e2 poly onto e1 poly and delete pointers to e2 ...
-
- OutPt* p1_lft = outRec1->Pts;
- OutPt* p1_rt = p1_lft->Prev;
- OutPt* p2_lft = outRec2->Pts;
- OutPt* p2_rt = p2_lft->Prev;
-
- //join e2 poly onto e1 poly and delete pointers to e2 ...
- if( e1->Side == esLeft )
- {
- if( e2->Side == esLeft )
- {
- //z y x a b c
- ReversePolyPtLinks(p2_lft);
- p2_lft->Next = p1_lft;
- p1_lft->Prev = p2_lft;
- p1_rt->Next = p2_rt;
- p2_rt->Prev = p1_rt;
- outRec1->Pts = p2_rt;
- } else
- {
- //x y z a b c
- p2_rt->Next = p1_lft;
- p1_lft->Prev = p2_rt;
- p2_lft->Prev = p1_rt;
- p1_rt->Next = p2_lft;
- outRec1->Pts = p2_lft;
- }
- } else
- {
- if( e2->Side == esRight )
- {
- //a b c z y x
- ReversePolyPtLinks(p2_lft);
- p1_rt->Next = p2_rt;
- p2_rt->Prev = p1_rt;
- p2_lft->Next = p1_lft;
- p1_lft->Prev = p2_lft;
- } else
- {
- //a b c x y z
- p1_rt->Next = p2_lft;
- p2_lft->Prev = p1_rt;
- p1_lft->Prev = p2_rt;
- p2_rt->Next = p1_lft;
- }
- }
-
- outRec1->BottomPt = 0;
- if (holeStateRec == outRec2)
- {
- if (outRec2->FirstLeft != outRec1)
- outRec1->FirstLeft = outRec2->FirstLeft;
- outRec1->IsHole = outRec2->IsHole;
- }
- outRec2->Pts = 0;
- outRec2->BottomPt = 0;
- outRec2->FirstLeft = outRec1;
-
- int OKIdx = e1->OutIdx;
- int ObsoleteIdx = e2->OutIdx;
-
- e1->OutIdx = Unassigned; //nb: safe because we only get here via AddLocalMaxPoly
- e2->OutIdx = Unassigned;
-
- TEdge* e = m_ActiveEdges;
- while( e )
- {
- if( e->OutIdx == ObsoleteIdx )
- {
- e->OutIdx = OKIdx;
- e->Side = e1->Side;
- break;
- }
- e = e->NextInAEL;
- }
-
- outRec2->Idx = outRec1->Idx;
-}
-//------------------------------------------------------------------------------
-
-OutPt* Clipper::AddOutPt(TEdge *e, const IntPoint &pt)
-{
- if( e->OutIdx < 0 )
- {
- OutRec *outRec = CreateOutRec();
- outRec->IsOpen = (e->WindDelta == 0);
- OutPt* newOp = new OutPt;
- outRec->Pts = newOp;
- newOp->Idx = outRec->Idx;
- newOp->Pt = pt;
- newOp->Next = newOp;
- newOp->Prev = newOp;
- if (!outRec->IsOpen)
- SetHoleState(e, outRec);
- e->OutIdx = outRec->Idx;
- return newOp;
- } else
- {
- OutRec *outRec = m_PolyOuts[e->OutIdx];
- //OutRec.Pts is the 'Left-most' point & OutRec.Pts.Prev is the 'Right-most'
- OutPt* op = outRec->Pts;
-
- bool ToFront = (e->Side == esLeft);
- if (ToFront && (pt == op->Pt)) return op;
- else if (!ToFront && (pt == op->Prev->Pt)) return op->Prev;
-
- OutPt* newOp = new OutPt;
- newOp->Idx = outRec->Idx;
- newOp->Pt = pt;
- newOp->Next = op;
- newOp->Prev = op->Prev;
- newOp->Prev->Next = newOp;
- op->Prev = newOp;
- if (ToFront) outRec->Pts = newOp;
- return newOp;
- }
-}
-//------------------------------------------------------------------------------
-
-OutPt* Clipper::GetLastOutPt(TEdge *e)
-{
- OutRec *outRec = m_PolyOuts[e->OutIdx];
- if (e->Side == esLeft)
- return outRec->Pts;
- else
- return outRec->Pts->Prev;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::ProcessHorizontals()
-{
- m_Maxima.sort();
- TEdge* horzEdge;
- while (PopEdgeFromSEL(horzEdge))
- {
- ProcessHorizontal(horzEdge);
- }
- m_Maxima.clear();
-}
-//------------------------------------------------------------------------------
-
-inline bool IsMinima(TEdge *e)
-{
- return e && (e->Prev->NextInLML != e) && (e->Next->NextInLML != e);
-}
-//------------------------------------------------------------------------------
-
-inline bool IsMaxima(TEdge *e, const cInt Y)
-{
- return e && e->Top.y == Y && !e->NextInLML;
-}
-//------------------------------------------------------------------------------
-
-inline bool IsIntermediate(TEdge *e, const cInt Y)
-{
- return e->Top.y == Y && e->NextInLML;
-}
-//------------------------------------------------------------------------------
-
-TEdge *GetMaximaPair(TEdge *e)
-{
- if ((e->Next->Top == e->Top) && !e->Next->NextInLML)
- return e->Next;
- else if ((e->Prev->Top == e->Top) && !e->Prev->NextInLML)
- return e->Prev;
- else return 0;
-}
-//------------------------------------------------------------------------------
-
-TEdge *GetMaximaPairEx(TEdge *e)
-{
- //as GetMaximaPair() but returns 0 if MaxPair isn't in AEL (unless it's horizontal)
- TEdge* result = GetMaximaPair(e);
- if (result && (result->OutIdx == Skip ||
- (result->NextInAEL == result->PrevInAEL && !IsHorizontal(*result)))) return 0;
- return result;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::SwapPositionsInSEL(TEdge *Edge1, TEdge *Edge2)
-{
- if( !( Edge1->NextInSEL ) && !( Edge1->PrevInSEL ) ) return;
- if( !( Edge2->NextInSEL ) && !( Edge2->PrevInSEL ) ) return;
-
- if( Edge1->NextInSEL == Edge2 )
- {
- TEdge* Next = Edge2->NextInSEL;
- if( Next ) Next->PrevInSEL = Edge1;
- TEdge* Prev = Edge1->PrevInSEL;
- if( Prev ) Prev->NextInSEL = Edge2;
- Edge2->PrevInSEL = Prev;
- Edge2->NextInSEL = Edge1;
- Edge1->PrevInSEL = Edge2;
- Edge1->NextInSEL = Next;
- }
- else if( Edge2->NextInSEL == Edge1 )
- {
- TEdge* Next = Edge1->NextInSEL;
- if( Next ) Next->PrevInSEL = Edge2;
- TEdge* Prev = Edge2->PrevInSEL;
- if( Prev ) Prev->NextInSEL = Edge1;
- Edge1->PrevInSEL = Prev;
- Edge1->NextInSEL = Edge2;
- Edge2->PrevInSEL = Edge1;
- Edge2->NextInSEL = Next;
- }
- else
- {
- TEdge* Next = Edge1->NextInSEL;
- TEdge* Prev = Edge1->PrevInSEL;
- Edge1->NextInSEL = Edge2->NextInSEL;
- if( Edge1->NextInSEL ) Edge1->NextInSEL->PrevInSEL = Edge1;
- Edge1->PrevInSEL = Edge2->PrevInSEL;
- if( Edge1->PrevInSEL ) Edge1->PrevInSEL->NextInSEL = Edge1;
- Edge2->NextInSEL = Next;
- if( Edge2->NextInSEL ) Edge2->NextInSEL->PrevInSEL = Edge2;
- Edge2->PrevInSEL = Prev;
- if( Edge2->PrevInSEL ) Edge2->PrevInSEL->NextInSEL = Edge2;
- }
-
- if( !Edge1->PrevInSEL ) m_SortedEdges = Edge1;
- else if( !Edge2->PrevInSEL ) m_SortedEdges = Edge2;
-}
-//------------------------------------------------------------------------------
-
-TEdge* GetNextInAEL(TEdge *e, Direction dir)
-{
- return dir == dLeftToRight ? e->NextInAEL : e->PrevInAEL;
-}
-//------------------------------------------------------------------------------
-
-void GetHorzDirection(TEdge& HorzEdge, Direction& Dir, cInt& Left, cInt& Right)
-{
- if (HorzEdge.Bot.x < HorzEdge.Top.x)
- {
- Left = HorzEdge.Bot.x;
- Right = HorzEdge.Top.x;
- Dir = dLeftToRight;
- } else
- {
- Left = HorzEdge.Top.x;
- Right = HorzEdge.Bot.x;
- Dir = dRightToLeft;
- }
-}
-//------------------------------------------------------------------------
-
-/*******************************************************************************
-* Notes: Horizontal edges (HEs) at scanline intersections (ie at the Top or *
-* Bottom of a scanbeam) are processed as if layered. The order in which HEs *
-* are processed doesn't matter. HEs intersect with other HE Bot.xs only [#] *
-* (or they could intersect with Top.xs only, ie EITHER Bot.xs OR Top.xs), *
-* and with other non-horizontal edges [*]. Once these intersections are *
-* processed, intermediate HEs then 'promote' the Edge above (NextInLML) into *
-* the AEL. These 'promoted' edges may in turn intersect [%] with other HEs. *
-*******************************************************************************/
-
-void Clipper::ProcessHorizontal(TEdge *horzEdge)
-{
- Direction dir;
- cInt horzLeft, horzRight;
- bool IsOpen = (horzEdge->WindDelta == 0);
-
- GetHorzDirection(*horzEdge, dir, horzLeft, horzRight);
-
- TEdge* eLastHorz = horzEdge, *eMaxPair = 0;
- while (eLastHorz->NextInLML && IsHorizontal(*eLastHorz->NextInLML))
- eLastHorz = eLastHorz->NextInLML;
- if (!eLastHorz->NextInLML)
- eMaxPair = GetMaximaPair(eLastHorz);
-
- MaximaList::const_iterator maxIt;
- MaximaList::const_reverse_iterator maxRit;
- if (!m_Maxima.empty())
- {
- //get the first maxima in range (X) ...
- if (dir == dLeftToRight)
- {
- maxIt = m_Maxima.begin();
- while (maxIt != m_Maxima.end() && *maxIt <= horzEdge->Bot.x) maxIt++;
- if (maxIt != m_Maxima.end() && *maxIt >= eLastHorz->Top.x)
- maxIt = m_Maxima.end();
- }
- else
- {
- maxRit = m_Maxima.rbegin();
- while (maxRit != m_Maxima.rend() && *maxRit > horzEdge->Bot.x) maxRit++;
- if (maxRit != m_Maxima.rend() && *maxRit <= eLastHorz->Top.x)
- maxRit = m_Maxima.rend();
- }
- }
-
- OutPt* op1 = 0;
-
- for (;;) //loop through consec. horizontal edges
- {
-
- bool IsLastHorz = (horzEdge == eLastHorz);
- TEdge* e = GetNextInAEL(horzEdge, dir);
- while(e)
- {
-
- //this code block inserts extra coords into horizontal edges (in output
- //polygons) whereever maxima touch these horizontal edges. This helps
- //'simplifying' polygons (ie if the Simplify property is set).
- if (!m_Maxima.empty())
- {
- if (dir == dLeftToRight)
- {
- while (maxIt != m_Maxima.end() && *maxIt < e->Curr.x)
- {
- if (horzEdge->OutIdx >= 0 && !IsOpen)
- AddOutPt(horzEdge, IntPoint(*maxIt, horzEdge->Bot.y));
- maxIt++;
- }
- }
- else
- {
- while (maxRit != m_Maxima.rend() && *maxRit > e->Curr.x)
- {
- if (horzEdge->OutIdx >= 0 && !IsOpen)
- AddOutPt(horzEdge, IntPoint(*maxRit, horzEdge->Bot.y));
- maxRit++;
- }
- }
- };
-
- if ((dir == dLeftToRight && e->Curr.x > horzRight) ||
- (dir == dRightToLeft && e->Curr.x < horzLeft)) break;
-
- //Also break if we've got to the end of an intermediate horizontal edge ...
- //nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
- if (e->Curr.x == horzEdge->Top.x && horzEdge->NextInLML &&
- e->Dx < horzEdge->NextInLML->Dx) break;
-
- if (horzEdge->OutIdx >= 0 && !IsOpen) //note: may be done multiple times
- {
- op1 = AddOutPt(horzEdge, e->Curr);
- TEdge* eNextHorz = m_SortedEdges;
- while (eNextHorz)
- {
- if (eNextHorz->OutIdx >= 0 &&
- HorzSegmentsOverlap(horzEdge->Bot.x,
- horzEdge->Top.x, eNextHorz->Bot.x, eNextHorz->Top.x))
- {
- OutPt* op2 = GetLastOutPt(eNextHorz);
- AddJoin(op2, op1, eNextHorz->Top);
- }
- eNextHorz = eNextHorz->NextInSEL;
- }
- AddGhostJoin(op1, horzEdge->Bot);
- }
-
- //OK, so far we're still in range of the horizontal Edge but make sure
- //we're at the last of consec. horizontals when matching with eMaxPair
- if(e == eMaxPair && IsLastHorz)
- {
- if (horzEdge->OutIdx >= 0)
- AddLocalMaxPoly(horzEdge, eMaxPair, horzEdge->Top);
- DeleteFromAEL(horzEdge);
- DeleteFromAEL(eMaxPair);
- return;
- }
-
- if(dir == dLeftToRight)
- {
- IntPoint Pt = IntPoint(e->Curr.x, horzEdge->Curr.y);
- IntersectEdges(horzEdge, e, Pt);
- }
- else
- {
- IntPoint Pt = IntPoint(e->Curr.x, horzEdge->Curr.y);
- IntersectEdges( e, horzEdge, Pt);
- }
- TEdge* eNext = GetNextInAEL(e, dir);
- SwapPositionsInAEL( horzEdge, e );
- e = eNext;
- } //end while(e)
-
- //Break out of loop if HorzEdge.NextInLML is not also horizontal ...
- if (!horzEdge->NextInLML || !IsHorizontal(*horzEdge->NextInLML)) break;
-
- UpdateEdgeIntoAEL(horzEdge);
- if (horzEdge->OutIdx >= 0) AddOutPt(horzEdge, horzEdge->Bot);
- GetHorzDirection(*horzEdge, dir, horzLeft, horzRight);
-
- } //end for (;;)
-
- if (horzEdge->OutIdx >= 0 && !op1)
- {
- op1 = GetLastOutPt(horzEdge);
- TEdge* eNextHorz = m_SortedEdges;
- while (eNextHorz)
- {
- if (eNextHorz->OutIdx >= 0 &&
- HorzSegmentsOverlap(horzEdge->Bot.x,
- horzEdge->Top.x, eNextHorz->Bot.x, eNextHorz->Top.x))
- {
- OutPt* op2 = GetLastOutPt(eNextHorz);
- AddJoin(op2, op1, eNextHorz->Top);
- }
- eNextHorz = eNextHorz->NextInSEL;
- }
- AddGhostJoin(op1, horzEdge->Top);
- }
-
- if (horzEdge->NextInLML)
- {
- if(horzEdge->OutIdx >= 0)
- {
- op1 = AddOutPt( horzEdge, horzEdge->Top);
- //When StrictlySimple and 'horzEdge' is being touched by another edge, then
- //make sure both edges have a vertex here ...
- if (m_StrictSimple)
- {
- TEdge* ePrev = horzEdge->PrevInAEL;
- if ((horzEdge->WindDelta != 0) && ePrev && (ePrev->OutIdx >= 0) &&
- (ePrev->Curr.x == horzEdge->Top.x) && (ePrev->WindDelta != 0))
- {
- IntPoint pt = horzEdge->Top;
- AddOutPt(ePrev, pt);
- }
- TEdge* eNext = horzEdge->NextInAEL;
- if ((horzEdge->WindDelta != 0) && eNext && (eNext->OutIdx >= 0) &&
- (eNext->Curr.x == horzEdge->Top.x) && (eNext->WindDelta != 0))
- {
- IntPoint pt = horzEdge->Top;
- AddOutPt(eNext, pt);
- }
- }
- UpdateEdgeIntoAEL(horzEdge);
- if (horzEdge->WindDelta == 0) return;
- //nb: HorzEdge is no longer horizontal here
- TEdge* ePrev = horzEdge->PrevInAEL;
- TEdge* eNext = horzEdge->NextInAEL;
- if (ePrev && ePrev->Curr.x == horzEdge->Bot.x &&
- ePrev->Curr.y == horzEdge->Bot.y && ePrev->WindDelta != 0 &&
- (ePrev->OutIdx >= 0 && ePrev->Curr.y > ePrev->Top.y &&
- SlopesEqual(*horzEdge, *ePrev, m_UseFullRange)))
- {
- OutPt* op2 = AddOutPt(ePrev, horzEdge->Bot);
- AddJoin(op1, op2, horzEdge->Top);
- }
- else if (eNext && eNext->Curr.x == horzEdge->Bot.x &&
- eNext->Curr.y == horzEdge->Bot.y && eNext->WindDelta != 0 &&
- eNext->OutIdx >= 0 && eNext->Curr.y > eNext->Top.y &&
- SlopesEqual(*horzEdge, *eNext, m_UseFullRange))
- {
- OutPt* op2 = AddOutPt(eNext, horzEdge->Bot);
- AddJoin(op1, op2, horzEdge->Top);
- }
- }
- else
- UpdateEdgeIntoAEL(horzEdge);
- }
- else
- {
- if (horzEdge->OutIdx >= 0) AddOutPt(horzEdge, horzEdge->Top);
- DeleteFromAEL(horzEdge);
- }
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::ProcessIntersections(const cInt topY)
-{
- if( !m_ActiveEdges ) return true;
- try {
- BuildIntersectList(topY);
- size_t IlSize = m_IntersectList.size();
- if (IlSize == 0) return true;
- if (IlSize == 1 || FixupIntersectionOrder()) ProcessIntersectList();
- else return false;
- }
- catch(std::exception const& ex)
- {
- m_SortedEdges = 0;
- DisposeIntersectNodes();
- throw clipperException((std::string("ProcessIntersections error ") + ex.what()).c_str());
- }
- m_SortedEdges = 0;
- return true;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::DisposeIntersectNodes()
-{
- for (size_t i = 0; i < m_IntersectList.size(); ++i )
- delete m_IntersectList[i];
- m_IntersectList.clear();
-}
-//------------------------------------------------------------------------------
-
-void Clipper::BuildIntersectList(const cInt topY)
-{
- if ( !m_ActiveEdges ) return;
-
- //prepare for sorting ...
- TEdge* e = m_ActiveEdges;
- m_SortedEdges = e;
- while( e )
- {
- e->PrevInSEL = e->PrevInAEL;
- e->NextInSEL = e->NextInAEL;
- e->Curr.x = TopX( *e, topY );
- e = e->NextInAEL;
- }
-
- //bubblesort ...
- bool isModified;
- do
- {
- isModified = false;
- e = m_SortedEdges;
- while( e->NextInSEL )
- {
- TEdge *eNext = e->NextInSEL;
- IntPoint Pt;
- if(e->Curr.x > eNext->Curr.x)
- {
- IntersectPoint(*e, *eNext, Pt);
- if (Pt.y < topY) Pt = IntPoint(TopX(*e, topY), topY);
- IntersectNode * newNode = new IntersectNode;
- newNode->Edge1 = e;
- newNode->Edge2 = eNext;
- newNode->Pt = Pt;
- m_IntersectList.push_back(newNode);
-
- SwapPositionsInSEL(e, eNext);
- isModified = true;
- }
- else
- e = eNext;
- }
- if( e->PrevInSEL ) e->PrevInSEL->NextInSEL = 0;
- else break;
- }
- while ( isModified );
- m_SortedEdges = 0; //important
-}
-//------------------------------------------------------------------------------
-
-
-void Clipper::ProcessIntersectList()
-{
- for (size_t i = 0; i < m_IntersectList.size(); ++i)
- {
- IntersectNode* iNode = m_IntersectList[i];
- {
- IntersectEdges( iNode->Edge1, iNode->Edge2, iNode->Pt);
- SwapPositionsInAEL( iNode->Edge1 , iNode->Edge2 );
- }
- delete iNode;
- }
- m_IntersectList.clear();
-}
-//------------------------------------------------------------------------------
-
-bool IntersectListSort(IntersectNode* node1, IntersectNode* node2)
-{
- if (node2->Pt.y != node1->Pt.y)
- {
- return node2->Pt.y < node1->Pt.y;
- }
- else
- {
- return (node2->Edge1->WindCnt2 + node2->Edge2->WindCnt2) > (node1->Edge1->WindCnt2 + node1->Edge2->WindCnt2);
- }
-}
-//------------------------------------------------------------------------------
-
-inline bool EdgesAdjacent(const IntersectNode &inode)
-{
- return (inode.Edge1->NextInSEL == inode.Edge2) ||
- (inode.Edge1->PrevInSEL == inode.Edge2);
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::FixupIntersectionOrder()
-{
- //pre-condition: intersections are sorted Bottom-most first.
- //Now it's crucial that intersections are made only between adjacent edges,
- //so to ensure this the order of intersections may need adjusting ...
- CopyAELToSEL();
- std::stable_sort(m_IntersectList.begin(), m_IntersectList.end(), IntersectListSort);
- size_t cnt = m_IntersectList.size();
- for (size_t i = 0; i < cnt; ++i)
- {
- if (!EdgesAdjacent(*m_IntersectList[i]))
- {
- size_t j = i + 1;
- while (j < cnt && !EdgesAdjacent(*m_IntersectList[j])) j++;
- if (j == cnt) return false;
- std::swap(m_IntersectList[i], m_IntersectList[j]);
- }
- SwapPositionsInSEL(m_IntersectList[i]->Edge1, m_IntersectList[i]->Edge2);
- }
- return true;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::DoMaxima(TEdge *e)
-{
- TEdge* eMaxPair = GetMaximaPairEx(e);
- if (!eMaxPair)
- {
- if (e->OutIdx >= 0)
- {
- AddOutPt(e, e->Top);
- }
- DeleteFromAEL(e);
- return;
- }
-
- TEdge* ePrev = e->PrevInAEL;
- if (ePrev && ePrev->Curr.x == e->Top.x && ePrev->Top != e->Top && ePrev->OutIdx >= 0 &&
- ePrev->WindDelta != 0 && e->OutIdx >= 0 && e->WindDelta != 0)
- {
- IntPoint pt = e->Top;
- AddOutPt(ePrev, pt);
- }
- TEdge* eNext = e->NextInAEL;
- while(eNext && eNext != eMaxPair)
- {
- IntersectEdges(e, eNext, e->Top);
- SwapPositionsInAEL(e, eNext);
- eNext = e->NextInAEL;
- }
- eNext = eMaxPair->NextInAEL;
- if (eNext && eNext->Curr.x == e->Top.x && eNext->Top != e->Top && eNext->OutIdx >= 0 &&
- eNext->WindDelta != 0 && e->OutIdx >= 0 && e->WindDelta != 0)
- {
- IntPoint pt = e->Top;
- AddOutPt(eNext, pt);
- }
-
- if(e->OutIdx == Unassigned && eMaxPair->OutIdx == Unassigned)
- {
- DeleteFromAEL(e);
- DeleteFromAEL(eMaxPair);
- }
- else if( e->OutIdx >= 0 && eMaxPair->OutIdx >= 0 )
- {
- AddLocalMaxPoly(e, eMaxPair, e->Top);
- DeleteFromAEL(e);
- DeleteFromAEL(eMaxPair);
- }
-#ifdef use_lines
- else if (e->WindDelta == 0)
- {
- if (e->OutIdx >= 0)
- {
- AddOutPt(e, e->Top);
- e->OutIdx = Unassigned;
- }
- DeleteFromAEL(e);
-
- if (eMaxPair->OutIdx >= 0)
- {
- AddOutPt(eMaxPair, e->Top);
- eMaxPair->OutIdx = Unassigned;
- }
- DeleteFromAEL(eMaxPair);
- }
-#endif
- else throw clipperException("DoMaxima error");
-}
-//------------------------------------------------------------------------------
-
-void Clipper::ProcessEdgesAtTopOfScanbeam(const cInt topY)
-{
- TEdge* e = m_ActiveEdges;
- MaximaList next_maxima;
- while( e )
- {
- //1. process maxima, treating them as if they're 'bent' horizontal edges,
- // but exclude maxima with horizontal edges. nb: e can't be a horizontal.
- bool IsMaximaEdge = IsMaxima(e, topY);
-
- if(IsMaximaEdge)
- {
- TEdge* eMaxPair = GetMaximaPairEx(e);
- IsMaximaEdge = (!eMaxPair || !IsHorizontal(*eMaxPair));
- }
-
- if(IsMaximaEdge)
- {
- if (m_StrictSimple)
- {
- m_Maxima.push_back(e->Top.x);
- next_maxima.push_back(e->Top.x);
- }
- TEdge* ePrev = e->PrevInAEL;
- DoMaxima(e);
- if( !ePrev ) e = m_ActiveEdges;
- else e = ePrev->NextInAEL;
- }
- else
- {
- //2. promote horizontal edges, otherwise update Curr.x and Curr.y ...
- if (IsIntermediate(e, topY) && IsHorizontal(*e->NextInLML))
- {
- UpdateEdgeIntoAEL(e);
- if (e->OutIdx >= 0)
- {
- AddOutPt(e, e->Bot);
- if (m_StrictSimple)
- {
- m_Maxima.push_back(e->Top.x);
- m_Maxima.push_back(e->Bot.x);
- next_maxima.push_back(e->Bot.x);
- }
- }
- AddEdgeToSEL(e);
- }
- else
- {
- e->Curr.x = TopX( *e, topY );
- e->Curr.y = topY;
- }
-
- //When StrictlySimple and 'e' is being touched by another edge, then
- //make sure both edges have a vertex here ...
- if (m_StrictSimple && e->OutIdx >= 0 && e->WindDelta != 0)
- {
- TEdge* ePrev = e->PrevInAEL;
- while (ePrev && ePrev->Curr.x == e->Curr.x)
- {
- if (ePrev->OutIdx >= 0 && ePrev->WindDelta != 0 &&
- !(e->Bot == ePrev->Bot && e->Top == ePrev->Top))
- {
- IntPoint pt = e->Curr;
-#ifdef use_xyz
- SetZ(pt, *ePrev, *e);
-#endif
- OutPt* op = AddOutPt(ePrev, pt);
- OutPt* op2 = AddOutPt(e, pt);
- AddJoin(op, op2, pt); //StrictlySimple (type-3) join
- }
- ePrev = ePrev->PrevInAEL;
- }
- }
-
- e = e->NextInAEL;
- }
- }
- if (m_StrictSimple)
- {
- MinimaList::iterator lm = m_CurrentLM;
- while (lm != m_MinimaList.end() && lm->y == topY)
- {
- if (lm->LeftBound && lm->RightBound)
- {
- m_Maxima.push_back(lm->LeftBound->Bot.x);
- }
- ++lm;
- }
- }
-
- //3. Process horizontals at the Top of the scanbeam ...
- ProcessHorizontals();
- if (m_StrictSimple && !next_maxima.empty())
- {
- m_Maxima.insert(m_Maxima.end(), next_maxima.begin(), next_maxima.end());
- }
-
- //4. Promote intermediate vertices ...
- e = m_ActiveEdges;
- while(e)
- {
- if(IsIntermediate(e, topY))
- {
- OutPt* op = 0;
- if( e->OutIdx >= 0 )
- op = AddOutPt(e, e->Top);
- UpdateEdgeIntoAEL(e);
-
- //if output polygons share an edge, they'll need joining later ...
- TEdge* ePrev = e->PrevInAEL;
- TEdge* eNext = e->NextInAEL;
- if (ePrev && ePrev->Curr.x == e->Bot.x &&
- ePrev->Curr.y == e->Bot.y && op &&
- ePrev->OutIdx >= 0 && ePrev->Curr.y > ePrev->Top.y &&
- SlopesEqual(e->Curr, e->Top, ePrev->Curr, ePrev->Top, m_UseFullRange) &&
- (e->WindDelta != 0) && (ePrev->WindDelta != 0))
- {
- OutPt* op2 = AddOutPt(ePrev, e->Bot);
- AddJoin(op, op2, e->Top);
- }
- else if (eNext && eNext->Curr.x == e->Bot.x &&
- eNext->Curr.y == e->Bot.y && op &&
- eNext->OutIdx >= 0 && eNext->Curr.y > eNext->Top.y &&
- SlopesEqual(e->Curr, e->Top, eNext->Curr, eNext->Top, m_UseFullRange) &&
- (e->WindDelta != 0) && (eNext->WindDelta != 0))
- {
- OutPt* op2 = AddOutPt(eNext, e->Bot);
- AddJoin(op, op2, e->Top);
- }
- }
- e = e->NextInAEL;
- }
-}
-//------------------------------------------------------------------------------
-
-void Clipper::FixupOutPolyline(OutRec &outrec)
-{
- OutPt *pp = outrec.Pts;
- OutPt *lastPP = pp->Prev;
- while (pp != lastPP)
- {
- pp = pp->Next;
- if (pp->Pt == pp->Prev->Pt)
- {
- if (pp == lastPP) lastPP = pp->Prev;
- OutPt *tmpPP = pp->Prev;
- tmpPP->Next = pp->Next;
- pp->Next->Prev = tmpPP;
- delete pp;
- pp = tmpPP;
- }
- }
-
- if (pp == pp->Prev)
- {
- DisposeOutPts(pp);
- outrec.Pts = 0;
- return;
- }
-}
-//------------------------------------------------------------------------------
-
-void Clipper::FixupOutPolygon(OutRec &outrec)
-{
- //FixupOutPolygon() - removes duplicate points and simplifies consecutive
- //parallel edges by removing the middle vertex.
- OutPt *lastOK = 0;
- outrec.BottomPt = 0;
- OutPt *pp = outrec.Pts;
- bool preserveCol = m_PreserveCollinear || m_StrictSimple;
-
- for (;;)
- {
- if (pp->Prev == pp || pp->Prev == pp->Next)
- {
- DisposeOutPts(pp);
- outrec.Pts = 0;
- return;
- }
-
- //test for duplicate points and collinear edges ...
- if ((pp->Pt == pp->Next->Pt) || (pp->Pt == pp->Prev->Pt) ||
- (SlopesEqual(pp->Prev->Pt, pp->Pt, pp->Next->Pt, m_UseFullRange) &&
- (!preserveCol || !Pt2IsBetweenPt1AndPt3(pp->Prev->Pt, pp->Pt, pp->Next->Pt))))
- {
- lastOK = 0;
- OutPt *tmp = pp;
- pp->Prev->Next = pp->Next;
- pp->Next->Prev = pp->Prev;
- pp = pp->Prev;
- delete tmp;
- }
- else if (pp == lastOK) break;
- else
- {
- if (!lastOK) lastOK = pp;
- pp = pp->Next;
- }
- }
- outrec.Pts = pp;
-}
-//------------------------------------------------------------------------------
-
-int PointCount(OutPt *Pts)
-{
- if (!Pts) return 0;
- int result = 0;
- OutPt* p = Pts;
- do
- {
- result++;
- p = p->Next;
- }
- while (p != Pts);
- return result;
-}
-
-//------------------------------------------------------------------------------
-
-void Clipper::BuildResult(Paths &polys)
-{
- polys.reserve(m_PolyOuts.size());
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- if (!m_PolyOuts[i]->Pts) continue;
- Path pg;
- OutPt* p = m_PolyOuts[i]->Pts->Prev;
- int cnt = PointCount(p);
- if (cnt < 2) continue;
- pg.reserve(cnt);
- for (int j = 0; j < cnt; ++j)
- {
- pg.push_back(p->Pt);
- p = p->Prev;
- }
- polys.push_back(pg);
- }
-}
-//------------------------------------------------------------------------------
-
-void Clipper::BuildResult2(PolyTree& polytree)
-{
- polytree.Clear();
- polytree.AllNodes.reserve(m_PolyOuts.size());
- //add each output polygon/contour to polytree ...
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); i++)
- {
- OutRec* outRec = m_PolyOuts[i];
- int cnt = PointCount(outRec->Pts);
- if ((outRec->IsOpen && cnt < 2) || (!outRec->IsOpen && cnt < 3)) continue;
- FixHoleLinkage(*outRec);
- PolyNode* pn = new PolyNode();
- //nb: polytree takes ownership of all the PolyNodes
- polytree.AllNodes.push_back(pn);
- outRec->PolyNd = pn;
- pn->Parent = 0;
- pn->Index = 0;
- pn->Contour.reserve(cnt);
- OutPt *op = outRec->Pts->Prev;
- for (int j = 0; j < cnt; j++)
- {
- pn->Contour.push_back(op->Pt);
- op = op->Prev;
- }
- }
-
- //fixup PolyNode links etc ...
- polytree.Childs.reserve(m_PolyOuts.size());
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); i++)
- {
- OutRec* outRec = m_PolyOuts[i];
- if (!outRec->PolyNd) continue;
- if (outRec->IsOpen)
- {
- outRec->PolyNd->m_IsOpen = true;
- polytree.AddChild(*outRec->PolyNd);
- }
- else if (outRec->FirstLeft && outRec->FirstLeft->PolyNd)
- outRec->FirstLeft->PolyNd->AddChild(*outRec->PolyNd);
- else
- polytree.AddChild(*outRec->PolyNd);
- }
-}
-//------------------------------------------------------------------------------
-
-void SwapIntersectNodes(IntersectNode &int1, IntersectNode &int2)
-{
- //just swap the contents (because fIntersectNodes is a single-linked-list)
- IntersectNode inode = int1; //gets a copy of Int1
- int1.Edge1 = int2.Edge1;
- int1.Edge2 = int2.Edge2;
- int1.Pt = int2.Pt;
- int2.Edge1 = inode.Edge1;
- int2.Edge2 = inode.Edge2;
- int2.Pt = inode.Pt;
-}
-//------------------------------------------------------------------------------
-
-inline bool E2InsertsBeforeE1(TEdge &e1, TEdge &e2)
-{
- if (e2.Curr.x == e1.Curr.x)
- {
- if (e2.Top.y > e1.Top.y)
- return e2.Top.x < TopX(e1, e2.Top.y);
- else return e1.Top.x > TopX(e2, e1.Top.y);
- }
- else return e2.Curr.x < e1.Curr.x;
-}
-//------------------------------------------------------------------------------
-
-bool GetOverlap(const cInt a1, const cInt a2, const cInt b1, const cInt b2,
- cInt& Left, cInt& Right)
-{
- if (a1 < a2)
- {
- if (b1 < b2) {Left = std::max(a1,b1); Right = std::min(a2,b2);}
- else {Left = std::max(a1,b2); Right = std::min(a2,b1);}
- }
- else
- {
- if (b1 < b2) {Left = std::max(a2,b1); Right = std::min(a1,b2);}
- else {Left = std::max(a2,b2); Right = std::min(a1,b1);}
- }
- return Left < Right;
-}
-//------------------------------------------------------------------------------
-
-inline void UpdateOutPtIdxs(OutRec& outrec)
-{
- OutPt* op = outrec.Pts;
- do
- {
- op->Idx = outrec.Idx;
- op = op->Prev;
- }
- while(op != outrec.Pts);
-}
-//------------------------------------------------------------------------------
-
-void Clipper::InsertEdgeIntoAEL(TEdge *edge, TEdge* startEdge)
-{
- if(!m_ActiveEdges)
- {
- edge->PrevInAEL = 0;
- edge->NextInAEL = 0;
- m_ActiveEdges = edge;
- }
- else if(!startEdge && E2InsertsBeforeE1(*m_ActiveEdges, *edge))
- {
- edge->PrevInAEL = 0;
- edge->NextInAEL = m_ActiveEdges;
- m_ActiveEdges->PrevInAEL = edge;
- m_ActiveEdges = edge;
- }
- else
- {
- if(!startEdge) startEdge = m_ActiveEdges;
- while(startEdge->NextInAEL &&
- !E2InsertsBeforeE1(*startEdge->NextInAEL , *edge))
- startEdge = startEdge->NextInAEL;
- edge->NextInAEL = startEdge->NextInAEL;
- if(startEdge->NextInAEL) startEdge->NextInAEL->PrevInAEL = edge;
- edge->PrevInAEL = startEdge;
- startEdge->NextInAEL = edge;
- }
-}
-//----------------------------------------------------------------------
-
-OutPt* DupOutPt(OutPt* outPt, bool InsertAfter)
-{
- OutPt* result = new OutPt;
- result->Pt = outPt->Pt;
- result->Idx = outPt->Idx;
- if (InsertAfter)
- {
- result->Next = outPt->Next;
- result->Prev = outPt;
- outPt->Next->Prev = result;
- outPt->Next = result;
- }
- else
- {
- result->Prev = outPt->Prev;
- result->Next = outPt;
- outPt->Prev->Next = result;
- outPt->Prev = result;
- }
- return result;
-}
-//------------------------------------------------------------------------------
-
-bool JoinHorz(OutPt* op1, OutPt* op1b, OutPt* op2, OutPt* op2b,
- const IntPoint Pt, bool DiscardLeft)
-{
- Direction Dir1 = (op1->Pt.x > op1b->Pt.x ? dRightToLeft : dLeftToRight);
- Direction Dir2 = (op2->Pt.x > op2b->Pt.x ? dRightToLeft : dLeftToRight);
- if (Dir1 == Dir2) return false;
-
- //When DiscardLeft, we want Op1b to be on the Left of Op1, otherwise we
- //want Op1b to be on the Right. (And likewise with Op2 and Op2b.)
- //So, to facilitate this while inserting Op1b and Op2b ...
- //when DiscardLeft, make sure we're AT or RIGHT of Pt before adding Op1b,
- //otherwise make sure we're AT or LEFT of Pt. (Likewise with Op2b.)
- if (Dir1 == dLeftToRight)
- {
- while (op1->Next->Pt.x <= Pt.x &&
- op1->Next->Pt.x >= op1->Pt.x && op1->Next->Pt.y == Pt.y)
- op1 = op1->Next;
- if (DiscardLeft && (op1->Pt.x != Pt.x)) op1 = op1->Next;
- op1b = DupOutPt(op1, !DiscardLeft);
- if (op1b->Pt != Pt)
- {
- op1 = op1b;
- op1->Pt = Pt;
- op1b = DupOutPt(op1, !DiscardLeft);
- }
- }
- else
- {
- while (op1->Next->Pt.x >= Pt.x &&
- op1->Next->Pt.x <= op1->Pt.x && op1->Next->Pt.y == Pt.y)
- op1 = op1->Next;
- if (!DiscardLeft && (op1->Pt.x != Pt.x)) op1 = op1->Next;
- op1b = DupOutPt(op1, DiscardLeft);
- if (op1b->Pt != Pt)
- {
- op1 = op1b;
- op1->Pt = Pt;
- op1b = DupOutPt(op1, DiscardLeft);
- }
- }
-
- if (Dir2 == dLeftToRight)
- {
- while (op2->Next->Pt.x <= Pt.x &&
- op2->Next->Pt.x >= op2->Pt.x && op2->Next->Pt.y == Pt.y)
- op2 = op2->Next;
- if (DiscardLeft && (op2->Pt.x != Pt.x)) op2 = op2->Next;
- op2b = DupOutPt(op2, !DiscardLeft);
- if (op2b->Pt != Pt)
- {
- op2 = op2b;
- op2->Pt = Pt;
- op2b = DupOutPt(op2, !DiscardLeft);
- };
- } else
- {
- while (op2->Next->Pt.x >= Pt.x &&
- op2->Next->Pt.x <= op2->Pt.x && op2->Next->Pt.y == Pt.y)
- op2 = op2->Next;
- if (!DiscardLeft && (op2->Pt.x != Pt.x)) op2 = op2->Next;
- op2b = DupOutPt(op2, DiscardLeft);
- if (op2b->Pt != Pt)
- {
- op2 = op2b;
- op2->Pt = Pt;
- op2b = DupOutPt(op2, DiscardLeft);
- };
- };
-
- if ((Dir1 == dLeftToRight) == DiscardLeft)
- {
- op1->Prev = op2;
- op2->Next = op1;
- op1b->Next = op2b;
- op2b->Prev = op1b;
- }
- else
- {
- op1->Next = op2;
- op2->Prev = op1;
- op1b->Prev = op2b;
- op2b->Next = op1b;
- }
- return true;
-}
-//------------------------------------------------------------------------------
-
-bool Clipper::JoinPoints(Join *j, OutRec* outRec1, OutRec* outRec2)
-{
- OutPt *op1 = j->OutPt1, *op1b;
- OutPt *op2 = j->OutPt2, *op2b;
-
- //There are 3 kinds of joins for output polygons ...
- //1. Horizontal joins where Join.OutPt1 & Join.OutPt2 are vertices anywhere
- //along (horizontal) collinear edges (& Join.OffPt is on the same horizontal).
- //2. Non-horizontal joins where Join.OutPt1 & Join.OutPt2 are at the same
- //location at the Bottom of the overlapping segment (& Join.OffPt is above).
- //3. StrictSimple joins where edges touch but are not collinear and where
- //Join.OutPt1, Join.OutPt2 & Join.OffPt all share the same point.
- bool isHorizontal = (j->OutPt1->Pt.y == j->OffPt.y);
-
- if (isHorizontal && (j->OffPt == j->OutPt1->Pt) &&
- (j->OffPt == j->OutPt2->Pt))
- {
- if (outRec1 != outRec2)
- {
- // First Op1 Next and Op2 Prev
- op1b = j->OutPt1->Next;
- while (op1b != op1 && (op1b->Pt == j->OffPt))
- op1b = op1b->Next;
- op2b = j->OutPt2->Prev;
- while (op2b != op2 && (op2b->Pt == j->OffPt))
- op2b = op2b->Prev;
- if (op1b->Pt == op2b->Pt)
- {
- OutPt* op1b_prev = op1b->Prev;
- OutPt* op2b_next = op2b->Next;
- op1b->Prev = op2b;
- op2b->Next = op1b;
- op1b_prev->Next = op2b_next;
- op2b_next->Prev = op1b_prev;
- return true;
- }
-
- // Second Op1 Prev and Op2 Next
- op2b = j->OutPt2->Next;
- while (op2b != op2 && (op2b->Pt == j->OffPt))
- op2b = op2b->Next;
- op1b = j->OutPt1->Prev;
- while (op1b != op1 && (op1b->Pt == j->OffPt))
- op1b = op1b->Prev;
- if (op2b->Pt == op1b->Pt)
- {
- OutPt* op2b_prev = op2b->Prev;
- OutPt* op1b_next = op1b->Next;
- op2b->Prev = op1b;
- op1b->Next = op2b;
- op2b_prev->Next = op1b_next;
- op1b_next->Prev = op2b_prev;
- return true;
- }
- return false;
- }
- //Strictly Simple join ...
- op1b = j->OutPt1->Next;
- while (op1b != op1 && (op1b->Pt == j->OffPt))
- op1b = op1b->Next;
- bool reverse1 = (op1b->Pt.y > j->OffPt.y);
- op2b = j->OutPt2->Next;
- while (op2b != op2 && (op2b->Pt == j->OffPt))
- op2b = op2b->Next;
- bool reverse2 = (op2b->Pt.y > j->OffPt.y);
- if (reverse1 == reverse2) return false;
- if (reverse1)
- {
- op1b = DupOutPt(op1, false);
- op2b = DupOutPt(op2, true);
- op1->Prev = op2;
- op2->Next = op1;
- op1b->Next = op2b;
- op2b->Prev = op1b;
- j->OutPt1 = op1;
- j->OutPt2 = op1b;
- return true;
- } else
- {
- op1b = DupOutPt(op1, true);
- op2b = DupOutPt(op2, false);
- op1->Next = op2;
- op2->Prev = op1;
- op1b->Prev = op2b;
- op2b->Next = op1b;
- j->OutPt1 = op1;
- j->OutPt2 = op1b;
- return true;
- }
- }
- else if (isHorizontal)
- {
- //treat horizontal joins differently to non-horizontal joins since with
- //them we're not yet sure where the overlapping is. OutPt1.Pt & OutPt2.Pt
- //may be anywhere along the horizontal edge.
- op1b = op1;
- while (op1->Prev->Pt.y == op1->Pt.y && op1->Prev != op1b && op1->Prev != op2)
- op1 = op1->Prev;
- while (op1b->Next->Pt.y == op1b->Pt.y && op1b->Next != op1 && op1b->Next != op2)
- op1b = op1b->Next;
- if (op1b->Next == op1 || op1b->Next == op2) return false; //a flat 'polygon'
-
- op2b = op2;
- while (op2->Prev->Pt.y == op2->Pt.y && op2->Prev != op2b && op2->Prev != op1b)
- op2 = op2->Prev;
- while (op2b->Next->Pt.y == op2b->Pt.y && op2b->Next != op2 && op2b->Next != op1)
- op2b = op2b->Next;
- if (op2b->Next == op2 || op2b->Next == op1) return false; //a flat 'polygon'
-
- cInt Left, Right;
- //Op1 --> Op1b & Op2 --> Op2b are the extremites of the horizontal edges
- if (!GetOverlap(op1->Pt.x, op1b->Pt.x, op2->Pt.x, op2b->Pt.x, Left, Right))
- return false;
-
- //DiscardLeftSide: when overlapping edges are joined, a spike will created
- //which needs to be cleaned up. However, we don't want Op1 or Op2 caught up
- //on the discard Side as either may still be needed for other joins ...
- IntPoint Pt;
- bool DiscardLeftSide;
- if (op1->Pt.x >= Left && op1->Pt.x <= Right)
- {
- Pt = op1->Pt; DiscardLeftSide = (op1->Pt.x > op1b->Pt.x);
- }
- else if (op2->Pt.x >= Left&& op2->Pt.x <= Right)
- {
- Pt = op2->Pt; DiscardLeftSide = (op2->Pt.x > op2b->Pt.x);
- }
- else if (op1b->Pt.x >= Left && op1b->Pt.x <= Right)
- {
- Pt = op1b->Pt; DiscardLeftSide = op1b->Pt.x > op1->Pt.x;
- }
- else
- {
- Pt = op2b->Pt; DiscardLeftSide = (op2b->Pt.x > op2->Pt.x);
- }
- j->OutPt1 = op1; j->OutPt2 = op2;
- return JoinHorz(op1, op1b, op2, op2b, Pt, DiscardLeftSide);
- } else
- {
- //nb: For non-horizontal joins ...
- // 1. Jr.OutPt1.Pt.y == Jr.OutPt2.Pt.y
- // 2. Jr.OutPt1.Pt > Jr.OffPt.y
-
- //make sure the polygons are correctly oriented ...
- op1b = op1->Next;
- while ((op1b->Pt == op1->Pt) && (op1b != op1)) op1b = op1b->Next;
- bool Reverse1 = ((op1b->Pt.y > op1->Pt.y) ||
- !SlopesEqual(op1->Pt, op1b->Pt, j->OffPt, m_UseFullRange));
- if (Reverse1)
- {
- op1b = op1->Prev;
- while ((op1b->Pt == op1->Pt) && (op1b != op1)) op1b = op1b->Prev;
- if ((op1b->Pt.y > op1->Pt.y) ||
- !SlopesEqual(op1->Pt, op1b->Pt, j->OffPt, m_UseFullRange)) return false;
- };
- op2b = op2->Next;
- while ((op2b->Pt == op2->Pt) && (op2b != op2))op2b = op2b->Next;
- bool Reverse2 = ((op2b->Pt.y > op2->Pt.y) ||
- !SlopesEqual(op2->Pt, op2b->Pt, j->OffPt, m_UseFullRange));
- if (Reverse2)
- {
- op2b = op2->Prev;
- while ((op2b->Pt == op2->Pt) && (op2b != op2)) op2b = op2b->Prev;
- if ((op2b->Pt.y > op2->Pt.y) ||
- !SlopesEqual(op2->Pt, op2b->Pt, j->OffPt, m_UseFullRange)) return false;
- }
-
- if ((op1b == op1) || (op2b == op2) || (op1b == op2b) ||
- ((outRec1 == outRec2) && (Reverse1 == Reverse2))) return false;
-
- if (Reverse1)
- {
- op1b = DupOutPt(op1, false);
- op2b = DupOutPt(op2, true);
- op1->Prev = op2;
- op2->Next = op1;
- op1b->Next = op2b;
- op2b->Prev = op1b;
- j->OutPt1 = op1;
- j->OutPt2 = op1b;
- return true;
- } else
- {
- op1b = DupOutPt(op1, true);
- op2b = DupOutPt(op2, false);
- op1->Next = op2;
- op2->Prev = op1;
- op1b->Prev = op2b;
- op2b->Next = op1b;
- j->OutPt1 = op1;
- j->OutPt2 = op1b;
- return true;
- }
- }
-}
-//----------------------------------------------------------------------
-
-static OutRec* ParseFirstLeft(OutRec* FirstLeft)
-{
- while (FirstLeft && !FirstLeft->Pts)
- FirstLeft = FirstLeft->FirstLeft;
- return FirstLeft;
-}
-//------------------------------------------------------------------------------
-
-void Clipper::FixupFirstLefts1(OutRec* OldOutRec, OutRec* NewOutRec)
-{
- //tests if NewOutRec contains the polygon before reassigning FirstLeft
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- OutRec* outRec = m_PolyOuts[i];
- OutRec* firstLeft = ParseFirstLeft(outRec->FirstLeft);
- if (outRec->Pts && firstLeft == OldOutRec)
- {
- if (Poly2ContainsPoly1(outRec->Pts, NewOutRec->Pts))
- {
- if (outRec->IsHole == NewOutRec->IsHole)
- {
- outRec->IsHole = !outRec->IsHole;
- ReversePolyPtLinks(outRec->Pts);
- }
- outRec->FirstLeft = NewOutRec;
- }
- }
- }
-}
-//----------------------------------------------------------------------
-
-void Clipper::FixupFirstLefts2(OutRec* InnerOutRec, OutRec* OuterOutRec)
-{
- //A polygon has split into two such that one is now the inner of the other.
- //It's possible that these polygons now wrap around other polygons, so check
- //every polygon that's also contained by OuterOutRec's FirstLeft container
- //(including 0) to see if they've become inner to the new inner polygon ...
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- OutRec* outRec = m_PolyOuts[i];
-
- if (!outRec->Pts || outRec == OuterOutRec || outRec == InnerOutRec)
- continue;
- OutRec* firstLeft = ParseFirstLeft(outRec->FirstLeft);
- if (firstLeft != InnerOutRec && firstLeft != OuterOutRec)
- continue;
- if (Poly2ContainsPoly1(outRec->Pts, InnerOutRec->Pts))
- {
- if (outRec->IsHole == InnerOutRec->IsHole)
- {
- outRec->IsHole = !outRec->IsHole;
- ReversePolyPtLinks(outRec->Pts);
- }
- outRec->FirstLeft = InnerOutRec;
- }
- else
- {
- if (outRec->IsHole == OuterOutRec->IsHole)
- {
- if (Poly2ContainsPoly1(outRec->Pts, OuterOutRec->Pts))
- {
- outRec->FirstLeft = OuterOutRec;
- }
- else
- {
- outRec->FirstLeft = ParseFirstLeft(OuterOutRec->FirstLeft);
- }
- }
- else
- {
- if (Area(outRec->Pts) == 0.0 && !Poly2ContainsPoly1(outRec->Pts, OuterOutRec->Pts))
- {
- outRec->IsHole = !outRec->IsHole;
- outRec->FirstLeft = ParseFirstLeft(OuterOutRec->FirstLeft);
- ReversePolyPtLinks(outRec->Pts);
- }
- else
- {
- outRec->FirstLeft = OuterOutRec;
- }
- }
- }
- }
-}
-//----------------------------------------------------------------------
-void Clipper::FixupFirstLefts3(OutRec* OldOutRec, OutRec* NewOutRec)
-{
- //reassigns FirstLeft WITHOUT testing if NewOutRec contains the polygon
- for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
- {
- OutRec* outRec = m_PolyOuts[i];
- // unused variable `firstLeft`: is this a bug? (dane)
- //OutRec* firstLeft = ParseFirstLeft(outRec->FirstLeft);
- if (outRec->Pts && outRec->FirstLeft == OldOutRec)
- outRec->FirstLeft = NewOutRec;
- }
-}
-//----------------------------------------------------------------------
-
-void Clipper::JoinCommonEdges()
-{
- for (JoinList::size_type i = 0; i < m_Joins.size(); i++)
- {
- Join* join = m_Joins[i];
-
- OutRec *outRec1 = GetOutRec(join->OutPt1->Idx);
- OutRec *outRec2 = GetOutRec(join->OutPt2->Idx);
-
- if (!outRec1->Pts || !outRec2->Pts) continue;
- if (outRec1->IsOpen || outRec2->IsOpen) continue;
-
- //get the polygon fragment with the correct hole state (FirstLeft)
- //before calling JoinPoints() ...
- OutRec *holeStateRec;
- if (outRec1 == outRec2) holeStateRec = outRec1;
- else if (OutRec1RightOfOutRec2(outRec1, outRec2)) holeStateRec = outRec2;
- else if (OutRec1RightOfOutRec2(outRec2, outRec1)) holeStateRec = outRec1;
- else holeStateRec = GetLowermostRec(outRec1, outRec2);
-
- if (!JoinPoints(join, outRec1, outRec2)) continue;
-
- if (outRec1 == outRec2)
- {
- //instead of joining two polygons, we've just created a new one by
- //splitting one polygon into two.
- outRec1->BottomPt = 0;
- outRec2 = CreateOutRec();
- if (PointCount(join->OutPt1) > PointCount(join->OutPt2))
- {
- outRec1->Pts = join->OutPt1;
- outRec2->Pts = join->OutPt2;
- }
- else
- {
- outRec1->Pts = join->OutPt2;
- outRec2->Pts = join->OutPt1;
- }
-
- //update all OutRec2.Pts Idx's ...
- UpdateOutPtIdxs(*outRec2);
-
- if (Poly2ContainsPoly1(outRec2->Pts, outRec1->Pts))
- {
- //outRec1 contains outRec2 ...
- outRec2->IsHole = !outRec1->IsHole;
- outRec2->FirstLeft = outRec1;
-
- if (m_UsingPolyTree) FixupFirstLefts2(outRec2, outRec1);
-
- if ((outRec2->IsHole ^ m_ReverseOutput) == (Area(*outRec2) > 0))
- ReversePolyPtLinks(outRec2->Pts);
-
- } else if (Poly2ContainsPoly1(outRec1->Pts, outRec2->Pts))
- {
- //outRec2 contains outRec1 ...
- outRec2->IsHole = outRec1->IsHole;
- outRec1->IsHole = !outRec2->IsHole;
- outRec2->FirstLeft = outRec1->FirstLeft;
- outRec1->FirstLeft = outRec2;
-
- if (m_UsingPolyTree) FixupFirstLefts2(outRec1, outRec2);
-
- if ((outRec1->IsHole ^ m_ReverseOutput) == (Area(*outRec1) > 0))
- ReversePolyPtLinks(outRec1->Pts);
- }
- else
- {
- //the 2 polygons are completely separate ...
- outRec2->IsHole = outRec1->IsHole;
- outRec2->FirstLeft = outRec1->FirstLeft;
-
- //fixup FirstLeft pointers that may need reassigning to OutRec2
- if (m_UsingPolyTree) FixupFirstLefts1(outRec1, outRec2);
- }
-
- } else
- {
- //joined 2 polygons together ...
-
- outRec2->Pts = 0;
- outRec2->BottomPt = 0;
- outRec2->Idx = outRec1->Idx;
-
- outRec1->IsHole = holeStateRec->IsHole;
- if (holeStateRec == outRec2)
- outRec1->FirstLeft = outRec2->FirstLeft;
- outRec2->FirstLeft = outRec1;
-
- if (m_UsingPolyTree) FixupFirstLefts3(outRec2, outRec1);
- }
- }
-}
-
-//------------------------------------------------------------------------------
-// ClipperOffset support functions ...
-//------------------------------------------------------------------------------
-
-DoublePoint GetUnitNormal(const IntPoint &pt1, const IntPoint &pt2)
-{
- if(pt2.x == pt1.x && pt2.y == pt1.y)
- return DoublePoint(0, 0);
-
- double Dx = (double)(pt2.x - pt1.x);
- double dy = (double)(pt2.y - pt1.y);
- double f = 1 *1.0/ std::sqrt( Dx*Dx + dy*dy );
- Dx *= f;
- dy *= f;
- return DoublePoint(dy, -Dx);
-}
-
-//------------------------------------------------------------------------------
-// ClipperOffset class
-//------------------------------------------------------------------------------
-
-ClipperOffset::ClipperOffset(double miterLimit, double arcTolerance)
-{
- this->MiterLimit = miterLimit;
- this->ArcTolerance = arcTolerance;
- m_lowest.x = -1;
-}
-//------------------------------------------------------------------------------
-
-ClipperOffset::~ClipperOffset()
-{
- Clear();
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::Clear()
-{
- for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
- delete m_polyNodes.Childs[i];
- m_polyNodes.Childs.clear();
- m_lowest.x = -1;
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::AddPath(const Path& path, JoinType joinType, EndType endType)
-{
- int highI = (int)path.size() - 1;
- if (highI < 0) return;
- PolyNode* newNode = new PolyNode();
- newNode->m_jointype = joinType;
- newNode->m_endtype = endType;
-
- //strip duplicate points from path and also get index to the lowest point ...
- if (endType == etClosedLine || endType == etClosedPolygon)
- while (highI > 0 && path[0] == path[highI]) highI--;
- newNode->Contour.reserve(highI + 1);
- newNode->Contour.push_back(path[0]);
- int j = 0, k = 0;
- for (int i = 1; i <= highI; i++)
- if (newNode->Contour[j] != path[i])
- {
- j++;
- newNode->Contour.push_back(path[i]);
- if (path[i].y > newNode->Contour[k].y ||
- (path[i].y == newNode->Contour[k].y &&
- path[i].x < newNode->Contour[k].x)) k = j;
- }
- if (endType == etClosedPolygon && j < 2)
- {
- delete newNode;
- return;
- }
- m_polyNodes.AddChild(*newNode);
-
- //if this path's lowest pt is lower than all the others then update m_lowest
- if (endType != etClosedPolygon) return;
- if (m_lowest.x < 0)
- m_lowest = IntPoint(m_polyNodes.ChildCount() - 1, k);
- else
- {
- IntPoint ip = m_polyNodes.Childs[(int)m_lowest.x]->Contour[(int)m_lowest.y];
- if (newNode->Contour[k].y > ip.y ||
- (newNode->Contour[k].y == ip.y &&
- newNode->Contour[k].x < ip.x))
- m_lowest = IntPoint(m_polyNodes.ChildCount() - 1, k);
- }
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::AddPaths(const Paths& paths, JoinType joinType, EndType endType)
-{
- for (Paths::size_type i = 0; i < paths.size(); ++i)
- AddPath(paths[i], joinType, endType);
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::FixOrientations()
-{
- //fixup orientations of all closed paths if the orientation of the
- //closed path with the lowermost vertex is wrong ...
- if (m_lowest.x >= 0 &&
- !Orientation(m_polyNodes.Childs[(int)m_lowest.x]->Contour))
- {
- for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
- {
- PolyNode& node = *m_polyNodes.Childs[i];
- if (node.m_endtype == etClosedPolygon ||
- (node.m_endtype == etClosedLine && Orientation(node.Contour)))
- ReversePath(node.Contour);
- }
- } else
- {
- for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
- {
- PolyNode& node = *m_polyNodes.Childs[i];
- if (node.m_endtype == etClosedLine && !Orientation(node.Contour))
- ReversePath(node.Contour);
- }
- }
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::Execute(Paths& solution, double delta)
-{
- solution.clear();
- FixOrientations();
- DoOffset(delta);
-
- //now clean up 'corners' ...
- Clipper clpr;
- clpr.AddPaths(m_destPolys, ptSubject, true);
- if (delta > 0)
- {
- clpr.Execute(ctUnion, solution, pftPositive, pftPositive);
- }
- else
- {
- IntRect r = clpr.GetBounds();
- Path outer(4);
- outer[0] = IntPoint(r.left - 10, r.bottom + 10);
- outer[1] = IntPoint(r.right + 10, r.bottom + 10);
- outer[2] = IntPoint(r.right + 10, r.top - 10);
- outer[3] = IntPoint(r.left - 10, r.top - 10);
-
- clpr.AddPath(outer, ptSubject, true);
- clpr.ReverseSolution(true);
- clpr.Execute(ctUnion, solution, pftNegative, pftNegative);
- if (!solution.empty()) solution.erase(solution.begin());
- }
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::Execute(PolyTree& solution, double delta)
-{
- solution.Clear();
- FixOrientations();
- DoOffset(delta);
-
- //now clean up 'corners' ...
- Clipper clpr;
- clpr.AddPaths(m_destPolys, ptSubject, true);
- if (delta > 0)
- {
- clpr.Execute(ctUnion, solution, pftPositive, pftPositive);
- }
- else
- {
- IntRect r = clpr.GetBounds();
- Path outer(4);
- outer[0] = IntPoint(r.left - 10, r.bottom + 10);
- outer[1] = IntPoint(r.right + 10, r.bottom + 10);
- outer[2] = IntPoint(r.right + 10, r.top - 10);
- outer[3] = IntPoint(r.left - 10, r.top - 10);
-
- clpr.AddPath(outer, ptSubject, true);
- clpr.ReverseSolution(true);
- clpr.Execute(ctUnion, solution, pftNegative, pftNegative);
- //remove the outer PolyNode rectangle ...
- if (solution.ChildCount() == 1 && solution.Childs[0]->ChildCount() > 0)
- {
- PolyNode* outerNode = solution.Childs[0];
- solution.Childs.reserve(outerNode->ChildCount());
- solution.Childs[0] = outerNode->Childs[0];
- solution.Childs[0]->Parent = outerNode->Parent;
- for (int i = 1; i < outerNode->ChildCount(); ++i)
- solution.AddChild(*outerNode->Childs[i]);
- }
- else
- solution.Clear();
- }
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::DoOffset(double delta)
-{
- m_destPolys.clear();
- m_delta = delta;
-
- //if Zero offset, just copy any CLOSED polygons to m_p and return ...
- if (NEAR_ZERO(delta))
- {
- m_destPolys.reserve(m_polyNodes.ChildCount());
- for (int i = 0; i < m_polyNodes.ChildCount(); i++)
- {
- PolyNode& node = *m_polyNodes.Childs[i];
- if (node.m_endtype == etClosedPolygon)
- m_destPolys.push_back(node.Contour);
- }
- return;
- }
-
- //see offset_triginometry3.svg in the documentation folder ...
- if (MiterLimit > 2) m_miterLim = 2/(MiterLimit * MiterLimit);
- else m_miterLim = 0.5;
-
- double y;
- if (ArcTolerance <= 0.0) y = def_arc_tolerance;
- else if (ArcTolerance > std::fabs(delta) * def_arc_tolerance)
- y = std::fabs(delta) * def_arc_tolerance;
- else y = ArcTolerance;
- //see offset_triginometry2.svg in the documentation folder ...
- double steps = pi / std::acos(1 - y / std::fabs(delta));
- if (steps > std::fabs(delta) * pi)
- steps = std::fabs(delta) * pi; //ie excessive precision check
- m_sin = std::sin(two_pi / steps);
- m_cos = std::cos(two_pi / steps);
- m_StepsPerRad = steps / two_pi;
- if (delta < 0.0) m_sin = -m_sin;
-
- m_destPolys.reserve(m_polyNodes.ChildCount() * 2);
- for (int i = 0; i < m_polyNodes.ChildCount(); i++)
- {
- PolyNode& node = *m_polyNodes.Childs[i];
- m_srcPoly = node.Contour;
-
- int len = (int)m_srcPoly.size();
- if (len == 0 || (delta <= 0 && (len < 3 || node.m_endtype != etClosedPolygon)))
- continue;
-
- m_destPoly.clear();
- if (len == 1)
- {
- if (node.m_jointype == jtRound)
- {
- double X = 1.0, Y = 0.0;
- for (cInt j = 1; j <= steps; j++)
- {
- m_destPoly.push_back(IntPoint(
- Round(m_srcPoly[0].x + X * delta),
- Round(m_srcPoly[0].y + Y * delta)));
- double X2 = X;
- X = X * m_cos - m_sin * Y;
- Y = X2 * m_sin + Y * m_cos;
- }
- }
- else
- {
- double X = -1.0, Y = -1.0;
- for (int j = 0; j < 4; ++j)
- {
- m_destPoly.push_back(IntPoint(
- Round(m_srcPoly[0].x + X * delta),
- Round(m_srcPoly[0].y + Y * delta)));
- if (X < 0) X = 1;
- else if (Y < 0) Y = 1;
- else X = -1;
- }
- }
- m_destPolys.push_back(m_destPoly);
- continue;
- }
- //build m_normals ...
- m_normals.clear();
- m_normals.reserve(len);
- for (int j = 0; j < len - 1; ++j)
- m_normals.push_back(GetUnitNormal(m_srcPoly[j], m_srcPoly[j + 1]));
- if (node.m_endtype == etClosedLine || node.m_endtype == etClosedPolygon)
- m_normals.push_back(GetUnitNormal(m_srcPoly[len - 1], m_srcPoly[0]));
- else
- m_normals.push_back(DoublePoint(m_normals[len - 2]));
-
- if (node.m_endtype == etClosedPolygon)
- {
- int k = len - 1;
- for (int j = 0; j < len; ++j)
- OffsetPoint(j, k, node.m_jointype);
- m_destPolys.push_back(m_destPoly);
- }
- else if (node.m_endtype == etClosedLine)
- {
- int k = len - 1;
- for (int j = 0; j < len; ++j)
- OffsetPoint(j, k, node.m_jointype);
- m_destPolys.push_back(m_destPoly);
- m_destPoly.clear();
- //re-build m_normals ...
- DoublePoint n = m_normals[len -1];
- for (int j = len - 1; j > 0; j--)
- m_normals[j] = DoublePoint(-m_normals[j - 1].x, -m_normals[j - 1].y);
- m_normals[0] = DoublePoint(-n.x, -n.y);
- k = 0;
- for (int j = len - 1; j >= 0; j--)
- OffsetPoint(j, k, node.m_jointype);
- m_destPolys.push_back(m_destPoly);
- }
- else
- {
- int k = 0;
- for (int j = 1; j < len - 1; ++j)
- OffsetPoint(j, k, node.m_jointype);
-
- IntPoint pt1;
- if (node.m_endtype == etOpenButt)
- {
- int j = len - 1;
- pt1 = IntPoint((cInt)Round(m_srcPoly[j].x + m_normals[j].x *
- delta), (cInt)Round(m_srcPoly[j].y + m_normals[j].y * delta));
- m_destPoly.push_back(pt1);
- pt1 = IntPoint((cInt)Round(m_srcPoly[j].x - m_normals[j].x *
- delta), (cInt)Round(m_srcPoly[j].y - m_normals[j].y * delta));
- m_destPoly.push_back(pt1);
- }
- else
- {
- int j = len - 1;
- k = len - 2;
- m_sinA = 0;
- m_normals[j] = DoublePoint(-m_normals[j].x, -m_normals[j].y);
- if (node.m_endtype == etOpenSquare)
- DoSquare(j, k);
- else
- DoRound(j, k);
- }
-
- //re-build m_normals ...
- for (int j = len - 1; j > 0; j--)
- m_normals[j] = DoublePoint(-m_normals[j - 1].x, -m_normals[j - 1].y);
- m_normals[0] = DoublePoint(-m_normals[1].x, -m_normals[1].y);
-
- k = len - 1;
- for (int j = k - 1; j > 0; --j) OffsetPoint(j, k, node.m_jointype);
-
- if (node.m_endtype == etOpenButt)
- {
- pt1 = IntPoint((cInt)Round(m_srcPoly[0].x - m_normals[0].x * delta),
- (cInt)Round(m_srcPoly[0].y - m_normals[0].y * delta));
- m_destPoly.push_back(pt1);
- pt1 = IntPoint((cInt)Round(m_srcPoly[0].x + m_normals[0].x * delta),
- (cInt)Round(m_srcPoly[0].y + m_normals[0].y * delta));
- m_destPoly.push_back(pt1);
- }
- else
- {
- k = 1;
- m_sinA = 0;
- if (node.m_endtype == etOpenSquare)
- DoSquare(0, 1);
- else
- DoRound(0, 1);
- }
- m_destPolys.push_back(m_destPoly);
- }
- }
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::OffsetPoint(int j, int& k, JoinType jointype)
-{
- //cross product ...
- m_sinA = (m_normals[k].x * m_normals[j].y - m_normals[j].x * m_normals[k].y);
- if (std::fabs(m_sinA * m_delta) < 1.0)
- {
- //dot product ...
- double cosA = (m_normals[k].x * m_normals[j].x + m_normals[j].y * m_normals[k].y );
- if (cosA > 0) // angle => 0 degrees
- {
- m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].x + m_normals[k].x * m_delta),
- Round(m_srcPoly[j].y + m_normals[k].y * m_delta)));
- return;
- }
- //else angle => 180 degrees
- }
- else if (m_sinA > 1.0) m_sinA = 1.0;
- else if (m_sinA < -1.0) m_sinA = -1.0;
-
- if (m_sinA * m_delta < 0)
- {
- m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].x + m_normals[k].x * m_delta),
- Round(m_srcPoly[j].y + m_normals[k].y * m_delta)));
- m_destPoly.push_back(m_srcPoly[j]);
- m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].x + m_normals[j].x * m_delta),
- Round(m_srcPoly[j].y + m_normals[j].y * m_delta)));
- }
- else
- switch (jointype)
- {
- case jtMiter:
- {
- double r = 1 + (m_normals[j].x * m_normals[k].x +
- m_normals[j].y * m_normals[k].y);
- if (r >= m_miterLim) DoMiter(j, k, r); else DoSquare(j, k);
- break;
- }
- case jtSquare: DoSquare(j, k); break;
- case jtRound: DoRound(j, k); break;
- }
- k = j;
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::DoSquare(int j, int k)
-{
- double dx = std::tan(std::atan2(m_sinA,
- m_normals[k].x * m_normals[j].x + m_normals[k].y * m_normals[j].y) / 4);
- m_destPoly.push_back(IntPoint(
- Round(m_srcPoly[j].x + m_delta * (m_normals[k].x - m_normals[k].y * dx)),
- Round(m_srcPoly[j].y + m_delta * (m_normals[k].y + m_normals[k].x * dx))));
- m_destPoly.push_back(IntPoint(
- Round(m_srcPoly[j].x + m_delta * (m_normals[j].x + m_normals[j].y * dx)),
- Round(m_srcPoly[j].y + m_delta * (m_normals[j].y - m_normals[j].x * dx))));
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::DoMiter(int j, int k, double r)
-{
- double q = m_delta / r;
- m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].x + (m_normals[k].x + m_normals[j].x) * q),
- Round(m_srcPoly[j].y + (m_normals[k].y + m_normals[j].y) * q)));
-}
-//------------------------------------------------------------------------------
-
-void ClipperOffset::DoRound(int j, int k)
-{
- double a = std::atan2(m_sinA,
- m_normals[k].x * m_normals[j].x + m_normals[k].y * m_normals[j].y);
- int steps = std::max((int)Round(m_StepsPerRad * std::fabs(a)), 1);
-
- double X = m_normals[k].x, Y = m_normals[k].y, X2;
- for (int i = 0; i < steps; ++i)
- {
- m_destPoly.push_back(IntPoint(
- Round(m_srcPoly[j].x + X * m_delta),
- Round(m_srcPoly[j].y + Y * m_delta)));
- X2 = X;
- X = X * m_cos - m_sin * Y;
- Y = X2 * m_sin + Y * m_cos;
- }
- m_destPoly.push_back(IntPoint(
- Round(m_srcPoly[j].x + m_normals[j].x * m_delta),
- Round(m_srcPoly[j].y + m_normals[j].y * m_delta)));
-}
-
-//------------------------------------------------------------------------------
-// Miscellaneous public functions
-//------------------------------------------------------------------------------
-
-bool SortOutPt(OutPt* op1, OutPt* op2)
-{
- if (op1->Pt.y > op2->Pt.y)
- {
- return true;
- }
- else if (op1->Pt.y < op2->Pt.y)
- {
- return false;
- }
- else if (op1->Pt.x < op2->Pt.x)
- {
- return true;
- }
- else if (op1->Pt.x > op2->Pt.x)
- {
- return false;
- }
- else
- {
- return (op1->Idx < op2->Idx);
- }
-}
-
-//-----------------------------------------------------------------------------
-
-struct OutPtIntersect
-{
- OutPt * op1;
- OutPt * op2;
-};
-
-//-----------------------------------------------------------------------------
-
-bool Clipper::FindIntersectLoop(std::unordered_multimap<int, OutPtIntersect> & dupeRec,
- std::list<std::pair<int, OutPtIntersect> > & iList,
- OutRec * outRec_parent,
- int idx_origin,
- int idx_search,
- std::set<int> & visited,
- OutPt * orig_pt,
- OutPt * prev_pt)
-{
- auto range = dupeRec.equal_range(idx_search);
- // Check for direct connection
- for (auto it = range.first; it != range.second;)
- {
- OutRec * itRec1 = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- if (itRec1->Idx != idx_search || (!itRec1->IsHole && !itRec2->IsHole))
- {
- it = dupeRec.erase(it);
- continue;
- }
- if (itRec2->Idx == idx_origin &&
- (outRec_parent == itRec2 || outRec_parent == ParseFirstLeft(itRec2->FirstLeft)) &&
- prev_pt->Pt != it->second.op2->Pt &&
- orig_pt->Pt != it->second.op2->Pt)
- {
- iList.emplace_front(idx_search, it->second);
- return true;
- }
- ++it;
- }
- range = dupeRec.equal_range(idx_search);
- visited.insert(idx_search);
- // Check for connection through chain of other intersections
- for (auto it = range.first; it != range.second && it != dupeRec.end() && it->first == idx_search; ++it)
- {
- OutRec * itRec = GetOutRec(it->second.op2->Idx);
- if (visited.count(itRec->Idx) > 0 ||
- (outRec_parent != itRec && outRec_parent != ParseFirstLeft(itRec->FirstLeft))
- || prev_pt->Pt == it->second.op2->Pt)
- {
- continue;
- }
- if (FindIntersectLoop(dupeRec, iList, outRec_parent, idx_origin, itRec->Idx, visited, orig_pt, it->second.op2))
- {
- iList.emplace_front(idx_search, it->second);
- return true;
- }
- }
- return false;
-}
-
-//-----------------------------------------------------------------------------
-
-bool Clipper::FixIntersects(std::unordered_multimap<int, OutPtIntersect> & dupeRec,
- OutPt * op_j,
- OutPt * op_k,
- OutRec * outRec_j,
- OutRec * outRec_k)
-{
- if (!outRec_j->IsHole && !outRec_k->IsHole)
- {
- // Both are not holes, return nothing to do.
- return false;
- }
- OutRec * outRec_origin;
- OutRec * outRec_search;
- OutRec * outRec_parent;
- OutPt * op_origin_1;
- OutPt * op_origin_2;
- if (!outRec_j->IsHole)
- {
- outRec_origin = outRec_j;
- outRec_parent = outRec_origin;
- outRec_search = outRec_k;
- op_origin_1 = op_j;
- op_origin_2 = op_k;
- }
- else if (!outRec_k->IsHole)
- {
- outRec_origin = outRec_k;
- outRec_parent = outRec_origin;
- outRec_search = outRec_j;
- op_origin_1 = op_k;
- op_origin_2 = op_j;
-
- }
- else // both are holes
- {
- // Order doesn't matter
- outRec_origin = outRec_j;
- outRec_parent = ParseFirstLeft(outRec_origin->FirstLeft);
- outRec_search = outRec_k;
- op_origin_1 = op_j;
- op_origin_2 = op_k;
- }
- if (outRec_parent != ParseFirstLeft(outRec_search->FirstLeft))
- {
- // The two holes do not have the same parent, do not add them
- // simply return!
- return false;
- }
- bool found = false;
- std::list<std::pair<int, OutPtIntersect> > iList;
- auto range = dupeRec.equal_range(outRec_search->Idx);
- // Check for direct connection
- for (auto it = range.first; it != range.second;)
- {
- OutRec * itRec1 = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- if (outRec_search->Idx != itRec1->Idx || outRec_search->Idx == itRec2->Idx)
- {
- it = dupeRec.erase(it);
- continue;
- }
- if (itRec2->Idx == outRec_origin->Idx)
- {
- found = true;
- if (op_origin_1->Pt != it->second.op2->Pt)
- {
- iList.emplace_back(outRec_search->Idx, it->second);
- break;
- }
- }
- ++it;
- }
- if (!found)
- {
- range = dupeRec.equal_range(outRec_search->Idx);
- std::set<int> visited;
- visited.insert(outRec_search->Idx);
- // Check for connection through chain of other intersections
- for (auto it = range.first; it != range.second && it != dupeRec.end() && it->first == outRec_search->Idx; ++it)
- {
- OutRec * itRec = GetOutRec(it->second.op2->Idx);
- if (itRec->Idx != outRec_search->Idx &&
- op_origin_2->Pt != it->second.op2->Pt &&
- (outRec_parent == itRec || outRec_parent == ParseFirstLeft(itRec->FirstLeft)) &&
- FindIntersectLoop(dupeRec, iList, outRec_parent, outRec_origin->Idx, itRec->Idx, visited, op_origin_2, it->second.op2))
- {
- found = true;
- iList.emplace_front(outRec_search->Idx, it->second);
- break;
- }
- }
- }
- if (!found)
- {
- OutPtIntersect intPt_origin = { op_origin_1, op_origin_2 };
- OutPtIntersect intPt_search = { op_origin_2, op_origin_1 };
- dupeRec.emplace(outRec_origin->Idx, intPt_origin);
- dupeRec.emplace(outRec_search->Idx, intPt_search);
- return false;
- }
-
- if (iList.empty())
- {
- return false;
- }
- if (outRec_origin->IsHole)
- {
- for (auto & iRing : iList)
- {
- OutRec * outRec_itr = GetOutRec(iRing.first);
- if (!outRec_itr->IsHole)
- {
- // Make the hole the origin!
- OutPt * op1 = op_origin_1;
- op_origin_1 = iRing.second.op1;
- iRing.second.op1 = op1;
- OutPt * op2 = op_origin_2;
- op_origin_2 = iRing.second.op2;
- iRing.second.op2 = op2;
- iRing.first = outRec_origin->Idx;
- outRec_origin = outRec_itr;
- outRec_parent = outRec_origin;
- break;
- }
- }
- }
-
- // Switch
- OutPt * op_origin_1_next = op_origin_1->Next;
- OutPt * op_origin_2_next = op_origin_2->Next;
- op_origin_1->Next = op_origin_2_next;
- op_origin_2->Next = op_origin_1_next;
- op_origin_1_next->Prev = op_origin_2;
- op_origin_2_next->Prev = op_origin_1;
-
- for (auto iRing : iList)
- {
- OutPt * op_search_1 = iRing.second.op1;
- OutPt * op_search_2 = iRing.second.op2;
- OutPt * op_search_1_next = op_search_1->Next;
- OutPt * op_search_2_next = op_search_2->Next;
- op_search_1->Next = op_search_2_next;
- op_search_2->Next = op_search_1_next;
- op_search_1_next->Prev = op_search_2;
- op_search_2_next->Prev = op_search_1;
- }
-
- OutRec * outRec_new = CreateOutRec();
- outRec_new->IsHole = false;
- if (outRec_origin->IsHole && ((Area(op_origin_1) < 0) ^ m_ReverseOutput))
- {
- outRec_origin->Pts = op_origin_1;
- outRec_new->Pts = op_origin_2;
- }
- else
- {
- outRec_origin->Pts = op_origin_2;
- outRec_new->Pts = op_origin_1;
- }
-
- UpdateOutPtIdxs(*outRec_origin);
- UpdateOutPtIdxs(*outRec_new);
-
- outRec_origin->BottomPt = 0;
-
- std::list<std::pair<int, OutPtIntersect> > move_list;
- for (auto iRing : iList)
- {
- OutRec * outRec_itr = GetOutRec(iRing.first);
- outRec_itr->Pts = 0;
- outRec_itr->BottomPt = 0;
- outRec_itr->Idx = outRec_origin->Idx;
- if (outRec_origin->IsHole)
- {
- outRec_itr->FirstLeft = ParseFirstLeft(outRec_origin->FirstLeft);
- }
- else
- {
- outRec_itr->FirstLeft = outRec_origin;
- }
- outRec_itr->IsHole = outRec_origin->IsHole;
- if (m_UsingPolyTree)
- {
- FixupFirstLefts3(outRec_itr, outRec_origin);
- }
- }
- if (outRec_origin->IsHole)
- {
- outRec_new->FirstLeft = outRec_origin;
- }
- else
- {
- outRec_new->FirstLeft = outRec_origin->FirstLeft;
- }
- if (m_UsingPolyTree)
- {
- if (outRec_origin->IsHole)
- {
- FixupFirstLefts2(outRec_new, outRec_origin);
- }
- else
- {
- FixupFirstLefts1(outRec_origin, outRec_new);
- }
- }
- for (auto iRing : iList)
- {
- auto range_itr = dupeRec.equal_range(iRing.first);
- if (range_itr.first != range_itr.second)
- {
- for (auto it = range_itr.first; it != range_itr.second; ++it)
- {
- OutRec * itRec = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- if (itRec == itRec2)
- {
- continue;
- }
- OutRec * flRec;
- OutRec * flRec2;
- if (itRec->IsHole)
- {
- flRec = ParseFirstLeft(itRec->FirstLeft);
- }
- else
- {
- flRec = itRec;
- }
- if (itRec2->IsHole)
- {
- flRec2 = ParseFirstLeft(itRec2->FirstLeft);
- }
- else
- {
- flRec2 = itRec2;
- }
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- move_list.emplace_back(itRec->Idx, it->second);
- }
- }
- dupeRec.erase(iRing.first);
- }
- }
- auto range_itr = dupeRec.equal_range(outRec_origin->Idx);
- for (auto it = range_itr.first; it != range_itr.second;)
- {
- OutRec * itRec = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- if (itRec == itRec2)
- {
- it = dupeRec.erase(it);
- continue;
- }
- OutRec * flRec;
- OutRec * flRec2;
- if (itRec->IsHole)
- {
- flRec = ParseFirstLeft(itRec->FirstLeft);
- }
- else
- {
- flRec = itRec;
- }
- if (itRec2->IsHole)
- {
- flRec2 = ParseFirstLeft(itRec2->FirstLeft);
- }
- else
- {
- flRec2 = itRec2;
- }
- if (itRec->Idx != outRec_origin->Idx)
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- move_list.emplace_back(itRec->Idx, it->second);
- }
- it = dupeRec.erase(it);
- }
- else
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- ++it;
- }
- else
- {
- it = dupeRec.erase(it);
- }
- }
- }
-
- if (!move_list.empty())
- {
- dupeRec.insert(move_list.begin(), move_list.end());
- }
- return true;
-}
-
-//-----------------------------------------------------------------------------
-
-void Clipper::DoSimplePolygons()
-{
- std::vector < OutPt*> m_OutPts;
- {
- PolyOutList::size_type i = 0;
- while (i < m_PolyOuts.size())
- {
- OutRec* outrec = m_PolyOuts[i++];
- OutPt* op = outrec->Pts;
- if (!op || outrec->IsOpen) continue;
- do
- {
- m_OutPts.push_back(op);
- op = op->Next;
- }
- while (op != outrec->Pts);
- }
- }
- std::stable_sort(m_OutPts.begin(), m_OutPts.end(), SortOutPt);
- std::unordered_multimap<int, OutPtIntersect> dupeRec;
- dupeRec.reserve(m_PolyOuts.size());
- std::size_t count = 0;
- for (std::size_t i = 1; i < m_OutPts.size(); ++i)
- {
- if (m_OutPts[i]->Pt == m_OutPts[i-1]->Pt)
- {
- ++count;
- continue;
- }
- if (count > 0)
- {
- for (std::size_t j = (i - count - 1); j < i; ++j)
- {
- if (m_OutPts[j]->Idx < 0) continue;
- OutRec * outRec_j = GetOutRec(m_OutPts[j]->Idx);
- int idx_j = outRec_j->Idx;
- for (std::size_t k = j + 1; k < i; ++k)
- {
- if (m_OutPts[k]->Idx < 0) continue;
- OutRec * outRec_k = GetOutRec(m_OutPts[k]->Idx);
- int idx_k = outRec_k->Idx;
- if (idx_k == idx_j)
- {
- OutPt * op = m_OutPts[j];
- OutPt * op2 = m_OutPts[k];
- OutRec * outrec = outRec_j;
- if (op != op2 && op2->Next != op && op2->Prev != op)
- {
- //split the polygon into two ...
- OutPt* op3 = op->Prev;
- OutPt* op4 = op2->Prev;
- op->Prev = op4;
- op4->Next = op;
- op2->Prev = op3;
- op3->Next = op2;
-
- OutRec* outrec2 = CreateOutRec();
- if (PointCount(op) > PointCount(op2))
- {
- outrec->Pts = op;
- outrec2->Pts = op2;
- }
- else
- {
- outrec->Pts = op2;
- outrec2->Pts = op;
- }
- UpdateOutPtIdxs(*outrec);
- UpdateOutPtIdxs(*outrec2);
- if (Poly2ContainsPoly1(outrec2->Pts, outrec->Pts))
- {
- //OutRec2 is contained by OutRec1 ...
- outrec2->IsHole = !outrec->IsHole;
- outrec2->FirstLeft = outrec;
- if (m_UsingPolyTree)
- {
- FixupFirstLefts2(outrec2, outrec);
- }
- auto range = dupeRec.equal_range(idx_j);
- std::list<std::pair<int, OutPtIntersect> > move_list;
- for (auto it = range.first; it != range.second;)
- {
- OutRec * itRec = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- OutRec * flRec;
- OutRec * flRec2;
- if (itRec->IsHole)
- {
- flRec = ParseFirstLeft(itRec->FirstLeft);
- }
- else
- {
- flRec = itRec;
- }
- if (itRec2->IsHole)
- {
- flRec2 = ParseFirstLeft(itRec2->FirstLeft);
- }
- else
- {
- flRec2 = itRec2;
- }
- if (itRec->Idx != idx_j)
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- move_list.emplace_back(itRec->Idx, it->second);
- }
- it = dupeRec.erase(it);
- }
- else
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- ++it;
- }
- else
- {
- it = dupeRec.erase(it);
- }
- }
- }
- if (!move_list.empty())
- {
- dupeRec.insert(move_list.begin(), move_list.end());
- }
- if (!outrec->IsHole)
- {
- OutPtIntersect intPt1 = { outrec->Pts, outrec2->Pts };
- OutPtIntersect intPt2 = { outrec2->Pts, outrec->Pts };
- dupeRec.emplace(outrec->Idx, intPt1);
- dupeRec.emplace(outrec2->Idx, intPt2);
- }
- }
- else if (Poly2ContainsPoly1(outrec->Pts, outrec2->Pts))
- {
- //OutRec1 is contained by OutRec2 ...
- outrec2->IsHole = outrec->IsHole;
- outrec->IsHole = !outrec2->IsHole;
- outrec2->FirstLeft = outrec->FirstLeft;
- outrec->FirstLeft = outrec2;
- if (m_UsingPolyTree)
- {
- FixupFirstLefts2(outrec, outrec2);
- }
- auto range = dupeRec.equal_range(idx_j);
- std::list<std::pair<int, OutPtIntersect> > move_list;
- for (auto it = range.first; it != range.second;)
- {
- OutRec * itRec = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- OutRec * flRec;
- OutRec * flRec2;
- if (itRec->IsHole)
- {
- flRec = ParseFirstLeft(itRec->FirstLeft);
- }
- else
- {
- flRec = itRec;
- }
- if (itRec2->IsHole)
- {
- flRec2 = ParseFirstLeft(itRec2->FirstLeft);
- }
- else
- {
- flRec2 = itRec2;
- }
- if (itRec->Idx != idx_j)
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- move_list.emplace_back(itRec->Idx, it->second);
- }
- it = dupeRec.erase(it);
- }
- else
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- ++it;
- }
- else
- {
- it = dupeRec.erase(it);
- }
- }
- }
- if (!move_list.empty())
- {
- dupeRec.insert(move_list.begin(), move_list.end());
- }
- if (!outrec2->IsHole)
- {
- OutPtIntersect intPt1 = { outrec->Pts, outrec2->Pts };
- OutPtIntersect intPt2 = { outrec2->Pts, outrec->Pts };
- dupeRec.emplace(outrec->Idx, intPt1);
- dupeRec.emplace(outrec2->Idx, intPt2);
- }
- }
- else
- {
- //the 2 polygons are separate ...
- outrec2->IsHole = outrec->IsHole;
- outrec2->FirstLeft = outrec->FirstLeft;
- if (m_UsingPolyTree)
- {
- FixupFirstLefts1(outrec, outrec2);
- }
- auto range = dupeRec.equal_range(idx_j);
- std::list<std::pair<int, OutPtIntersect> > move_list;
- for (auto it = range.first; it != range.second;)
- {
- OutRec * itRec = GetOutRec(it->second.op1->Idx);
- OutRec * itRec2 = GetOutRec(it->second.op2->Idx);
- OutRec * flRec;
- OutRec * flRec2;
- if (itRec->IsHole)
- {
- flRec = ParseFirstLeft(itRec->FirstLeft);
- }
- else
- {
- flRec = itRec;
- }
- if (itRec2->IsHole)
- {
- flRec2 = ParseFirstLeft(itRec2->FirstLeft);
- }
- else
- {
- flRec2 = itRec2;
- }
- if (itRec->Idx != idx_j)
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- move_list.emplace_back(itRec->Idx, it->second);
- }
- it = dupeRec.erase(it);
- }
- else
- {
- if ((itRec->IsHole || itRec2->IsHole) && (flRec == flRec2))
- {
- ++it;
- }
- else
- {
- it = dupeRec.erase(it);
- }
- }
- }
- if (!move_list.empty())
- {
- dupeRec.insert(move_list.begin(), move_list.end());
- }
- if (outrec2->IsHole)
- {
- OutPtIntersect intPt1 = { outrec->Pts, outrec2->Pts };
- OutPtIntersect intPt2 = { outrec2->Pts, outrec->Pts };
- dupeRec.emplace(outrec->Idx, intPt1);
- dupeRec.emplace(outrec2->Idx, intPt2);
- }
- }
- outRec_j = GetOutRec(m_OutPts[j]->Idx);
- idx_j = outRec_j->Idx;
- }
- continue;
- }
- if (FixIntersects(dupeRec, m_OutPts[j], m_OutPts[k], outRec_j, outRec_k))
- {
- outRec_j = GetOutRec(m_OutPts[j]->Idx);
- idx_j = outRec_j->Idx;
- }
- }
- }
- count = 0;
- }
- }
-}
-//------------------------------------------------------------------------------
-
-void ReversePath(Path& p)
-{
- std::reverse(p.begin(), p.end());
-}
-//------------------------------------------------------------------------------
-
-void ReversePaths(Paths& p)
-{
- for (Paths::size_type i = 0; i < p.size(); ++i)
- ReversePath(p[i]);
-}
-//------------------------------------------------------------------------------
-
-void SimplifyPolygon(const Path &in_poly, Paths &out_polys, PolyFillType fillType)
-{
- Clipper c;
- c.StrictlySimple(true);
- c.AddPath(in_poly, ptSubject, true);
- c.Execute(ctUnion, out_polys, fillType, fillType);
-}
-//------------------------------------------------------------------------------
-
-void SimplifyPolygons(const Paths &in_polys, Paths &out_polys, PolyFillType fillType)
-{
- Clipper c;
- c.StrictlySimple(true);
- c.AddPaths(in_polys, ptSubject, true);
- c.Execute(ctUnion, out_polys, fillType, fillType);
-}
-//------------------------------------------------------------------------------
-
-void SimplifyPolygons(Paths &polys, PolyFillType fillType)
-{
- SimplifyPolygons(polys, polys, fillType);
-}
-//------------------------------------------------------------------------------
-
-inline double DistanceSqrd(const IntPoint& pt1, const IntPoint& pt2)
-{
- double Dx = ((double)pt1.x - pt2.x);
- double dy = ((double)pt1.y - pt2.y);
- return (Dx*Dx + dy*dy);
-}
-//------------------------------------------------------------------------------
-
-double DistanceFromLineSqrd(
- const IntPoint& pt, const IntPoint& ln1, const IntPoint& ln2)
-{
- //The equation of a line in general form (Ax + By + C = 0)
- //given 2 points (x¹,y¹) & (x²,y²) is ...
- //(y¹ - y²)x + (x² - x¹)y + (y² - y¹)x¹ - (x² - x¹)y¹ = 0
- //A = (y¹ - y²); B = (x² - x¹); C = (y² - y¹)x¹ - (x² - x¹)y¹
- //perpendicular distance of point (x³,y³) = (Ax³ + By³ + C)/Sqrt(A² + B²)
- //see http://en.wikipedia.org/wiki/Perpendicular_distance
- double A = double(ln1.y - ln2.y);
- double B = double(ln2.x - ln1.x);
- double C = A * ln1.x + B * ln1.y;
- C = A * pt.x + B * pt.y - C;
- return (C * C) / (A * A + B * B);
-}
-//---------------------------------------------------------------------------
-
-bool SlopesNearCollinear(const IntPoint& pt1,
- const IntPoint& pt2, const IntPoint& pt3, double distSqrd)
-{
- //this function is more accurate when the point that's geometrically
- //between the other 2 points is the one that's tested for distance.
- //ie makes it more likely to pick up 'spikes' ...
- if (Abs(pt1.x - pt2.x) > Abs(pt1.y - pt2.y))
- {
- if ((pt1.x > pt2.x) == (pt1.x < pt3.x))
- return DistanceFromLineSqrd(pt1, pt2, pt3) < distSqrd;
- else if ((pt2.x > pt1.x) == (pt2.x < pt3.x))
- return DistanceFromLineSqrd(pt2, pt1, pt3) < distSqrd;
- else
- return DistanceFromLineSqrd(pt3, pt1, pt2) < distSqrd;
- }
- else
- {
- if ((pt1.y > pt2.y) == (pt1.y < pt3.y))
- return DistanceFromLineSqrd(pt1, pt2, pt3) < distSqrd;
- else if ((pt2.y > pt1.y) == (pt2.y < pt3.y))
- return DistanceFromLineSqrd(pt2, pt1, pt3) < distSqrd;
- else
- return DistanceFromLineSqrd(pt3, pt1, pt2) < distSqrd;
- }
-}
-//------------------------------------------------------------------------------
-
-bool PointsAreClose(IntPoint pt1, IntPoint pt2, double distSqrd)
-{
- double Dx = (double)pt1.x - pt2.x;
- double dy = (double)pt1.y - pt2.y;
- return ((Dx * Dx) + (dy * dy) <= distSqrd);
-}
-//------------------------------------------------------------------------------
-
-OutPt* ExcludeOp(OutPt* op)
-{
- OutPt* result = op->Prev;
- result->Next = op->Next;
- op->Next->Prev = result;
- result->Idx = 0;
- return result;
-}
-//------------------------------------------------------------------------------
-
-void CleanPolygon(const Path& in_poly, Path& out_poly, double distance)
-{
- //distance = proximity in units/pixels below which vertices
- //will be stripped. Default ~= sqrt(2).
-
- size_t size = in_poly.size();
-
- if (size == 0)
- {
- out_poly.clear();
- return;
- }
-
- OutPt* outPts = new OutPt[size];
- for (size_t i = 0; i < size; ++i)
- {
- outPts[i].Pt = in_poly[i];
- outPts[i].Next = &outPts[(i + 1) % size];
- outPts[i].Next->Prev = &outPts[i];
- outPts[i].Idx = 0;
- }
-
- double distSqrd = distance * distance;
- OutPt* op = &outPts[0];
- while (op->Idx == 0 && op->Next != op->Prev)
- {
- if (PointsAreClose(op->Pt, op->Prev->Pt, distSqrd))
- {
- op = ExcludeOp(op);
- size--;
- }
- else if (PointsAreClose(op->Prev->Pt, op->Next->Pt, distSqrd))
- {
- ExcludeOp(op->Next);
- op = ExcludeOp(op);
- size -= 2;
- }
- else if (SlopesNearCollinear(op->Prev->Pt, op->Pt, op->Next->Pt, distSqrd))
- {
- op = ExcludeOp(op);
- size--;
- }
- else
- {
- op->Idx = 1;
- op = op->Next;
- }
- }
-
- if (size < 3) size = 0;
- out_poly.resize(size);
- for (size_t i = 0; i < size; ++i)
- {
- out_poly[i] = op->Pt;
- op = op->Next;
- }
- delete [] outPts;
-}
-//------------------------------------------------------------------------------
-
-void CleanPolygon(Path& poly, double distance)
-{
- CleanPolygon(poly, poly, distance);
-}
-//------------------------------------------------------------------------------
-
-void CleanPolygons(const Paths& in_polys, Paths& out_polys, double distance)
-{
- out_polys.resize(in_polys.size());
- for (Paths::size_type i = 0; i < in_polys.size(); ++i)
- CleanPolygon(in_polys[i], out_polys[i], distance);
-}
-//------------------------------------------------------------------------------
-
-void CleanPolygons(Paths& polys, double distance)
-{
- CleanPolygons(polys, polys, distance);
-}
-//------------------------------------------------------------------------------
-
-void Minkowski(const Path& poly, const Path& path,
- Paths& solution, bool isSum, bool isClosed)
-{
- int delta = (isClosed ? 1 : 0);
- size_t polyCnt = poly.size();
- size_t pathCnt = path.size();
- Paths pp;
- pp.reserve(pathCnt);
- if (isSum)
- for (size_t i = 0; i < pathCnt; ++i)
- {
- Path p;
- p.reserve(polyCnt);
- for (size_t j = 0; j < poly.size(); ++j)
- p.push_back(IntPoint(path[i].x + poly[j].x, path[i].y + poly[j].y));
- pp.push_back(p);
- }
- else
- for (size_t i = 0; i < pathCnt; ++i)
- {
- Path p;
- p.reserve(polyCnt);
- for (size_t j = 0; j < poly.size(); ++j)
- p.push_back(IntPoint(path[i].x - poly[j].x, path[i].y - poly[j].y));
- pp.push_back(p);
- }
-
- solution.clear();
- solution.reserve((pathCnt + delta) * (polyCnt + 1));
- for (size_t i = 0; i < pathCnt - 1 + delta; ++i)
- for (size_t j = 0; j < polyCnt; ++j)
- {
- Path quad;
- quad.reserve(4);
- quad.push_back(pp[i % pathCnt][j % polyCnt]);
- quad.push_back(pp[(i + 1) % pathCnt][j % polyCnt]);
- quad.push_back(pp[(i + 1) % pathCnt][(j + 1) % polyCnt]);
- quad.push_back(pp[i % pathCnt][(j + 1) % polyCnt]);
- if (!Orientation(quad)) ReversePath(quad);
- solution.push_back(quad);
- }
-}
-//------------------------------------------------------------------------------
-
-void MinkowskiSum(const Path& pattern, const Path& path, Paths& solution, bool pathIsClosed)
-{
- Minkowski(pattern, path, solution, true, pathIsClosed);
- Clipper c;
- c.AddPaths(solution, ptSubject, true);
- c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
-}
-//------------------------------------------------------------------------------
-
-void TranslatePath(const Path& input, Path& output, const IntPoint delta)
-{
- //precondition: input != output
- output.resize(input.size());
- for (size_t i = 0; i < input.size(); ++i)
- output[i] = IntPoint(input[i].x + delta.x, input[i].y + delta.y);
-}
-//------------------------------------------------------------------------------
-
-void MinkowskiSum(const Path& pattern, const Paths& paths, Paths& solution, bool pathIsClosed)
-{
- Clipper c;
- for (size_t i = 0; i < paths.size(); ++i)
- {
- Paths tmp;
- Minkowski(pattern, paths[i], tmp, true, pathIsClosed);
- c.AddPaths(tmp, ptSubject, true);
- if (pathIsClosed)
- {
- Path tmp2;
- TranslatePath(paths[i], tmp2, pattern[0]);
- c.AddPath(tmp2, ptClip, true);
- }
- }
- c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
-}
-//------------------------------------------------------------------------------
-
-void MinkowskiDiff(const Path& poly1, const Path& poly2, Paths& solution)
-{
- Minkowski(poly1, poly2, solution, false, true);
- Clipper c;
- c.AddPaths(solution, ptSubject, true);
- c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
-}
-//------------------------------------------------------------------------------
-
-enum NodeType {ntAny, ntOpen, ntClosed};
-
-void AddPolyNodeToPaths(const PolyNode& polynode, NodeType nodetype, Paths& paths)
-{
- bool match = true;
- if (nodetype == ntClosed) match = !polynode.IsOpen();
- else if (nodetype == ntOpen) return;
-
- if (!polynode.Contour.empty() && match)
- paths.push_back(polynode.Contour);
- for (int i = 0; i < polynode.ChildCount(); ++i)
- AddPolyNodeToPaths(*polynode.Childs[i], nodetype, paths);
-}
-//------------------------------------------------------------------------------
-
-void PolyTreeToPaths(const PolyTree& polytree, Paths& paths)
-{
- paths.resize(0);
- paths.reserve(polytree.Total());
- AddPolyNodeToPaths(polytree, ntAny, paths);
-}
-//------------------------------------------------------------------------------
-
-void ClosedPathsFromPolyTree(const PolyTree& polytree, Paths& paths)
-{
- paths.resize(0);
- paths.reserve(polytree.Total());
- AddPolyNodeToPaths(polytree, ntClosed, paths);
-}
-//------------------------------------------------------------------------------
-
-void OpenPathsFromPolyTree(PolyTree& polytree, Paths& paths)
-{
- paths.resize(0);
- paths.reserve(polytree.Total());
- //Open paths are top level only, so ...
- for (int i = 0; i < polytree.ChildCount(); ++i)
- if (polytree.Childs[i]->IsOpen())
- paths.push_back(polytree.Childs[i]->Contour);
-}
-//------------------------------------------------------------------------------
-
-std::ostream& operator <<(std::ostream &s, const IntPoint &p)
-{
- s << "(" << p.x << "," << p.y << ")";
- return s;
-}
-//------------------------------------------------------------------------------
-
-std::ostream& operator <<(std::ostream &s, const Path &p)
-{
- if (p.empty()) return s;
- Path::size_type last = p.size() -1;
- for (Path::size_type i = 0; i < last; i++)
- s << "(" << p[i].x << "," << p[i].y << "), ";
- s << "(" << p[last].x << "," << p[last].y << ")\n";
- return s;
-}
-//------------------------------------------------------------------------------
-
-std::ostream& operator <<(std::ostream &s, const Paths &p)
-{
- for (Paths::size_type i = 0; i < p.size(); i++)
- s << p[i];
- s << "\n";
- return s;
-}
-//------------------------------------------------------------------------------
-
-} //ClipperLib namespace
diff --git a/src/clipper/clipper.hpp b/src/clipper/clipper.hpp deleted file mode 100644 index 661aeb33e6..0000000000 --- a/src/clipper/clipper.hpp +++ /dev/null @@ -1,450 +0,0 @@ -/*******************************************************************************
-* *
-* Author : Angus Johnson *
-* Version : 6.4.0 *
-* Date : 2 July 2015 *
-* Website : http://www.angusj.com *
-* Copyright : Angus Johnson 2010-2015 *
-* *
-* License: *
-* Use, modification & distribution is subject to Boost Software License Ver 1. *
-* http://www.boost.org/LICENSE_1_0.txt *
-* *
-* Attributions: *
-* The code in this library is an extension of Bala Vatti's clipping algorithm: *
-* "A generic solution to polygon clipping" *
-* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63. *
-* http://portal.acm.org/citation.cfm?id=129906 *
-* *
-* Computer graphics and geometric modeling: implementation and algorithms *
-* By Max K. Agoston *
-* Springer; 1 edition (January 4, 2005) *
-* http://books.google.com/books?q=vatti+clipping+agoston *
-* *
-* See also: *
-* "Polygon Offsetting by Computing Winding Numbers" *
-* Paper no. DETC2005-85513 pp. 565-575 *
-* ASME 2005 International Design Engineering Technical Conferences *
-* and Computers and Information in Engineering Conference (IDETC/CIE2005) *
-* September 24-28, 2005 , Long Beach, California, USA *
-* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf *
-* *
-*******************************************************************************/
-
-#ifndef clipper_hpp
-#define clipper_hpp
-
-#define CLIPPER_VERSION "6.2.6"
-
-//use_int32: When enabled 32bit ints are used instead of 64bit ints. This
-//improve performance but coordinate values are limited to the range +/- 46340
-//#define use_int32
-
-//use_xyz: adds a Z member to IntPoint. Adds a minor cost to perfomance.
-//#define use_xyz
-
-//use_lines: Enables line clipping. Adds a very minor cost to performance.
-//#define use_lines
-
-//use_deprecated: Enables temporary support for the obsolete functions
-//#define use_deprecated
-
-#include <vector>
-#include <list>
-#include <set>
-#include <stdexcept>
-#include <cstring>
-#include <cstdlib>
-#include <ostream>
-#include <functional>
-#include <queue>
-#include <unordered_map>
-#if defined(CLIPPER_IMPL_INCLUDE)
-#include CLIPPER_IMPL_INCLUDE
-#endif
-
-namespace ClipperLib {
-
-enum ClipType { ctIntersection, ctUnion, ctDifference, ctXor };
-enum PolyType { ptSubject, ptClip };
-//By far the most widely used winding rules for polygon filling are
-//EvenOdd & NonZero (GDI, GDI+, XLib, OpenGL, Cairo, AGG, Quartz, SVG, Gr32)
-//Others rules include Positive, Negative and ABS_GTR_EQ_TWO (only in OpenGL)
-//see http://glprogramming.com/red/chapter11.html
-enum PolyFillType { pftEvenOdd, pftNonZero, pftPositive, pftNegative };
-
-#ifdef use_int32
- typedef int cInt;
- static cInt const loRange = 0x7FFF;
- static cInt const hiRange = 0x7FFF;
-#else
- typedef std::int64_t cInt;
- static cInt const loRange = 0x3FFFFFFF;
- static cInt const hiRange = 0x3FFFFFFFFFFFFFFFLL;
- typedef signed long long long64; //used by Int128 class
- typedef unsigned long long ulong64;
-
-#endif
-
-#if defined(CLIPPER_INTPOINT_IMPL)
-
-typedef CLIPPER_INTPOINT_IMPL IntPoint;
-
-#else
-
-struct IntPoint {
- cInt x;
- cInt y;
-#ifdef use_xyz
- cInt Z;
- IntPoint(cInt _x = 0, cInt _y = 0, cInt z = 0): x(_x), y(_y), Z(z) {};
-#else
- IntPoint(cInt _x = 0, cInt _y = 0): x(_x), y(_y) {};
-#endif
-
- friend inline bool operator== (const IntPoint& a, const IntPoint& b)
- {
- return a.x == b.x && a.y == b.y;
- }
- friend inline bool operator!= (const IntPoint& a, const IntPoint& b)
- {
- return a.x != b.x || a.y != b.y;
- }
-};
-#endif
-
-//------------------------------------------------------------------------------
-
-#if defined(CLIPPER_PATH_IMPL)
-
-typedef CLIPPER_PATH_IMPL Path;
-
-#else
-
-typedef std::vector< IntPoint > Path;
-
-#endif
-
-
-#if defined(CLIPPER_PATHS_IMPL)
-
-typedef CLIPPER_PATHS_IMPL Paths;
-
-#else
-
-typedef std::vector< Path > Paths;
-
-#endif
-
-
-
-inline Path& operator <<(Path& poly, const IntPoint& p) {poly.push_back(p); return poly;}
-inline Paths& operator <<(Paths& polys, const Path& p) {polys.push_back(p); return polys;}
-
-std::ostream& operator <<(std::ostream &s, const IntPoint &p);
-std::ostream& operator <<(std::ostream &s, const Path &p);
-std::ostream& operator <<(std::ostream &s, const Paths &p);
-
-struct DoublePoint
-{
- double x;
- double y;
- DoublePoint(double _x = 0, double _y = 0) : x(_x), y(_y) {}
- DoublePoint(IntPoint ip) : x((double)ip.x), y((double)ip.y) {}
-};
-//------------------------------------------------------------------------------
-
-#ifdef use_xyz
-typedef void (*ZFillCallback)(IntPoint& e1bot, IntPoint& e1top, IntPoint& e2bot, IntPoint& e2top, IntPoint& pt);
-#endif
-
-enum InitOptions {ioReverseSolution = 1, ioStrictlySimple = 2, ioPreserveCollinear = 4};
-enum JoinType {jtSquare, jtRound, jtMiter};
-enum EndType {etClosedPolygon, etClosedLine, etOpenButt, etOpenSquare, etOpenRound};
-
-class PolyNode;
-typedef std::vector< PolyNode* > PolyNodes;
-
-class PolyNode
-{
-public:
- PolyNode();
- virtual ~PolyNode(){};
- Path Contour;
- PolyNodes Childs;
- PolyNode* Parent;
- PolyNode* GetNext() const;
- bool IsHole() const;
- bool IsOpen() const;
- int ChildCount() const;
-private:
- unsigned Index; //node index in Parent.Childs
- bool m_IsOpen;
- JoinType m_jointype;
- EndType m_endtype;
- PolyNode* GetNextSiblingUp() const;
- void AddChild(PolyNode& child);
- friend class Clipper; //to access Index
- friend class ClipperOffset;
-};
-
-class PolyTree: public PolyNode
-{
-public:
- ~PolyTree(){Clear();};
- PolyNode* GetFirst() const;
- void Clear();
- int Total() const;
-private:
- PolyNodes AllNodes;
- friend class Clipper; //to access AllNodes
-};
-
-bool Orientation(const Path &poly);
-double Area(const Path &poly);
-int PointInPolygon(const IntPoint &pt, const Path &path);
-
-void SimplifyPolygon(const Path &in_poly, Paths &out_polys, PolyFillType fillType = pftEvenOdd);
-void SimplifyPolygons(const Paths &in_polys, Paths &out_polys, PolyFillType fillType = pftEvenOdd);
-void SimplifyPolygons(Paths &polys, PolyFillType fillType = pftEvenOdd);
-
-void CleanPolygon(const Path& in_poly, Path& out_poly, double distance = 1.415);
-void CleanPolygon(Path& poly, double distance = 1.415);
-void CleanPolygons(const Paths& in_polys, Paths& out_polys, double distance = 1.415);
-void CleanPolygons(Paths& polys, double distance = 1.415);
-
-void MinkowskiSum(const Path& pattern, const Path& path, Paths& solution, bool pathIsClosed);
-void MinkowskiSum(const Path& pattern, const Paths& paths, Paths& solution, bool pathIsClosed);
-void MinkowskiDiff(const Path& poly1, const Path& poly2, Paths& solution);
-
-void PolyTreeToPaths(const PolyTree& polytree, Paths& paths);
-void ClosedPathsFromPolyTree(const PolyTree& polytree, Paths& paths);
-void OpenPathsFromPolyTree(PolyTree& polytree, Paths& paths);
-
-void ReversePath(Path& p);
-void ReversePaths(Paths& p);
-
-struct IntRect { cInt left; cInt top; cInt right; cInt bottom; };
-
-//enums that are used internally ...
-enum EdgeSide { esLeft = 1, esRight = 2};
-
-//forward declarations (for stuff used internally) ...
-struct TEdge;
-struct IntersectNode;
-struct LocalMinimum;
-struct OutPt;
-struct OutRec;
-struct Join;
-struct OutPtIntersect;
-
-typedef std::vector < OutRec* > PolyOutList;
-typedef std::vector < TEdge* > EdgeList;
-typedef std::vector < Join* > JoinList;
-typedef std::vector < IntersectNode* > IntersectList;
-
-//------------------------------------------------------------------------------
-
-//ClipperBase is the ancestor to the Clipper class. It should not be
-//instantiated directly. This class simply abstracts the conversion of sets of
-//polygon coordinates into edge objects that are stored in a LocalMinima list.
-class ClipperBase
-{
-public:
- ClipperBase();
- virtual ~ClipperBase();
- virtual bool AddPath(const Path &pg, PolyType PolyTyp, bool Closed);
- bool AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed);
- virtual void Clear();
- IntRect GetBounds();
- bool PreserveCollinear() {return m_PreserveCollinear;};
- void PreserveCollinear(bool value) {m_PreserveCollinear = value;};
-protected:
- void DisposeLocalMinimaList();
- TEdge* AddBoundsToLML(TEdge *e, bool IsClosed);
- virtual void Reset();
- TEdge* ProcessBound(TEdge* E, bool IsClockwise);
- void InsertScanbeam(const cInt Y);
- bool PopScanbeam(cInt &Y);
- bool LocalMinimaPending();
- bool PopLocalMinima(cInt Y, const LocalMinimum *&locMin);
- OutRec* CreateOutRec();
- void DisposeAllOutRecs();
- void DisposeOutRec(PolyOutList::size_type index);
- void SwapPositionsInAEL(TEdge *edge1, TEdge *edge2);
- void DeleteFromAEL(TEdge *e);
- void UpdateEdgeIntoAEL(TEdge *&e);
-
- typedef std::vector<LocalMinimum> MinimaList;
- MinimaList::iterator m_CurrentLM;
- MinimaList m_MinimaList;
-
- bool m_UseFullRange;
- EdgeList m_edges;
- bool m_PreserveCollinear;
- bool m_HasOpenPaths;
- PolyOutList m_PolyOuts;
- TEdge *m_ActiveEdges;
-
- typedef std::priority_queue<cInt> ScanbeamList;
- ScanbeamList m_Scanbeam;
-};
-//------------------------------------------------------------------------------
-
-class Clipper : public virtual ClipperBase
-{
-public:
- Clipper(int initOptions = 0);
- bool Execute(ClipType clipType,
- Paths &solution,
- PolyFillType fillType = pftEvenOdd);
- bool Execute(ClipType clipType,
- Paths &solution,
- PolyFillType subjFillType,
- PolyFillType clipFillType);
- bool Execute(ClipType clipType,
- PolyTree &polytree,
- PolyFillType fillType = pftEvenOdd);
- bool Execute(ClipType clipType,
- PolyTree &polytree,
- PolyFillType subjFillType,
- PolyFillType clipFillType);
- bool ReverseSolution() { return m_ReverseOutput; };
- void ReverseSolution(bool value) {m_ReverseOutput = value;};
- bool StrictlySimple() {return m_StrictSimple;};
- void StrictlySimple(bool value) {m_StrictSimple = value;};
- //set the callback function for z value filling on intersections (otherwise Z is 0)
-#ifdef use_xyz
- void ZFillFunction(ZFillCallback zFillFunc);
-#endif
-protected:
- virtual bool ExecuteInternal();
-private:
- JoinList m_Joins;
- JoinList m_GhostJoins;
- IntersectList m_IntersectList;
- ClipType m_ClipType;
- typedef std::list<cInt> MaximaList;
- MaximaList m_Maxima;
- TEdge *m_SortedEdges;
- bool m_ExecuteLocked;
- PolyFillType m_ClipFillType;
- PolyFillType m_SubjFillType;
- bool m_ReverseOutput;
- bool m_UsingPolyTree;
- bool m_StrictSimple;
-#ifdef use_xyz
- ZFillCallback m_ZFill; //custom callback
-#endif
- void SetWindingCount(TEdge& edge);
- bool IsEvenOddFillType(const TEdge& edge) const;
- bool IsEvenOddAltFillType(const TEdge& edge) const;
- void InsertLocalMinimaIntoAEL(const cInt botY);
- void InsertEdgeIntoAEL(TEdge *edge, TEdge* startEdge);
- void AddEdgeToSEL(TEdge *edge);
- bool PopEdgeFromSEL(TEdge *&edge);
- void CopyAELToSEL();
- void DeleteFromSEL(TEdge *e);
- void SwapPositionsInSEL(TEdge *edge1, TEdge *edge2);
- bool IsContributing(const TEdge& edge) const;
- bool IsTopHorz(const cInt XPos);
- void DoMaxima(TEdge *e);
- void ProcessHorizontals();
- void ProcessHorizontal(TEdge *horzEdge);
- void AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);
- OutPt* AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);
- OutRec* GetOutRec(int idx);
- void AppendPolygon(TEdge *e1, TEdge *e2);
- void IntersectEdges(TEdge *e1, TEdge *e2, IntPoint &pt);
- OutPt* AddOutPt(TEdge *e, const IntPoint &pt);
- OutPt* GetLastOutPt(TEdge *e);
- bool ProcessIntersections(const cInt topY);
- void BuildIntersectList(const cInt topY);
- void ProcessIntersectList();
- void ProcessEdgesAtTopOfScanbeam(const cInt topY);
- void BuildResult(Paths& polys);
- void BuildResult2(PolyTree& polytree);
- void SetHoleState(TEdge *e, OutRec *outrec);
- void DisposeIntersectNodes();
- bool FixupIntersectionOrder();
- void FixupOutPolygon(OutRec &outrec);
- void FixupOutPolyline(OutRec &outrec);
- bool IsHole(TEdge *e);
- bool FindOwnerFromSplitRecs(OutRec &outRec, OutRec *&currOrfl);
- void FixHoleLinkage(OutRec &outrec);
- void AddJoin(OutPt *op1, OutPt *op2, const IntPoint offPt);
- void ClearJoins();
- void ClearGhostJoins();
- void AddGhostJoin(OutPt *op, const IntPoint offPt);
- bool JoinPoints(Join *j, OutRec* outRec1, OutRec* outRec2);
- void JoinCommonEdges();
- void DoSimplePolygons();
- bool FindIntersectLoop(std::unordered_multimap<int, OutPtIntersect> & dupeRec,
- std::list<std::pair<int, OutPtIntersect> > & iList,
- OutRec * outRec_parent,
- int idx_origin,
- int idx_prev,
- std::set<int> & visited,
- OutPt * orig_pt,
- OutPt * prev_pt);
- bool FixIntersects(std::unordered_multimap<int, OutPtIntersect> & dupeRec,
- OutPt * op_j,
- OutPt * op_k,
- OutRec * outRec_j,
- OutRec * outRec_k);
- void FixupFirstLefts1(OutRec* OldOutRec, OutRec* NewOutRec);
- void FixupFirstLefts2(OutRec* InnerOutRec, OutRec* OuterOutRec);
- void FixupFirstLefts3(OutRec* OldOutRec, OutRec* NewOutRec);
-#ifdef use_xyz
- void SetZ(IntPoint& pt, TEdge& e1, TEdge& e2);
-#endif
-};
-//------------------------------------------------------------------------------
-
-class ClipperOffset
-{
-public:
- ClipperOffset(double miterLimit = 2.0, double roundPrecision = 0.25);
- ~ClipperOffset();
- void AddPath(const Path& path, JoinType joinType, EndType endType);
- void AddPaths(const Paths& paths, JoinType joinType, EndType endType);
- void Execute(Paths& solution, double delta);
- void Execute(PolyTree& solution, double delta);
- void Clear();
- double MiterLimit;
- double ArcTolerance;
-private:
- Paths m_destPolys;
- Path m_srcPoly;
- Path m_destPoly;
- std::vector<DoublePoint> m_normals;
- double m_delta, m_sinA, m_sin, m_cos;
- double m_miterLim, m_StepsPerRad;
- IntPoint m_lowest;
- PolyNode m_polyNodes;
-
- void FixOrientations();
- void DoOffset(double delta);
- void OffsetPoint(int j, int& k, JoinType jointype);
- void DoSquare(int j, int k);
- void DoMiter(int j, int k, double r);
- void DoRound(int j, int k);
-};
-//------------------------------------------------------------------------------
-
-class clipperException : public std::exception
-{
- public:
- clipperException(const char* description): m_descr(description) {}
- virtual ~clipperException() throw() {}
- virtual const char* what() const throw() {return m_descr.c_str();}
- private:
- std::string m_descr;
-};
-//------------------------------------------------------------------------------
-
-} //ClipperLib namespace
-
-#endif //clipper_hpp
-
-
diff --git a/src/clipper/fix_members.sh b/src/clipper/fix_members.sh deleted file mode 100755 index 998d45f0d6..0000000000 --- a/src/clipper/fix_members.sh +++ /dev/null @@ -1,24 +0,0 @@ -#!/usr/bin/env bash - -export ROOTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" - -perl -i -p -e "s/\.X/\.x/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/\->X/\->x/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/cInt X;/cInt x;/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/double X;/double x;/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/X\(x\)/x\(_x\)/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/X\(\(/x\(\(/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/double x = 0/double _x = 0/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/cInt x = 0/cInt _x = 0/g;" ${ROOTDIR}/clipper.* - -perl -i -p -e "s/\.Y/\.y/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/\->Y/\->y/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/cInt Y;/cInt y;/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/double Y;/double y;/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/Y\(y\)/y\(_y\)/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/Y\(\(/y\(\(/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/cInt Y;/cInt y;/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/double y = 0/double _y = 0/g;" ${ROOTDIR}/clipper.* -perl -i -p -e "s/cInt y = 0/cInt _y = 0/g;" ${ROOTDIR}/clipper.* - - diff --git a/src/mbgl/tile/geometry_tile_data.cpp b/src/mbgl/tile/geometry_tile_data.cpp index ebf27e7858..b635c194ec 100644 --- a/src/mbgl/tile/geometry_tile_data.cpp +++ b/src/mbgl/tile/geometry_tile_data.cpp @@ -1,7 +1,7 @@ #include <mbgl/tile/geometry_tile_data.hpp> #include <mbgl/tile/tile_id.hpp> -#include <clipper/clipper.hpp> +#include <mapbox/geometry/wagyu/wagyu.hpp> namespace mbgl { @@ -17,8 +17,8 @@ static double signedArea(const GeometryCoordinates& ring) { return sum; } -static ClipperLib::Path toClipperPath(const GeometryCoordinates& ring) { - ClipperLib::Path result; +static LinearRing<std::int32_t> toWagyuPath(const GeometryCoordinates& ring) { + LinearRing<std::int32_t> result; result.reserve(ring.size()); for (const auto& p : ring) { result.emplace_back(p.x, p.y); @@ -26,62 +26,84 @@ static ClipperLib::Path toClipperPath(const GeometryCoordinates& ring) { return result; } -static GeometryCoordinates fromClipperPath(const ClipperLib::Path& path) { - GeometryCoordinates result; - result.reserve(path.size() + 1); - - for (const auto& p : path) { - using Coordinate = GeometryCoordinates::coordinate_type; - assert(p.x >= std::numeric_limits<Coordinate>::min()); - assert(p.x <= std::numeric_limits<Coordinate>::max()); - assert(p.y >= std::numeric_limits<Coordinate>::min()); - assert(p.y <= std::numeric_limits<Coordinate>::max()); - result.emplace_back(Coordinate(p.x), Coordinate(p.y)); - } - - // Clipper does not repeat initial point, but our geometry model requires it. - if (!result.empty()) { - result.push_back(result.front()); - } - - return result; +static void pushWagyuRing(GeometryCollection & solution, + mapbox::geometry::wagyu::ring_ptr<std::int32_t> r) { + GeometryCoordinates lr; + lr.reserve(r->size() + 1); + auto firstPt = r->points; + auto ptIt = r->points; + do { + lr.emplace_back(ptIt->x, ptIt->y); + ptIt = ptIt->prev; + } while (ptIt != firstPt); + lr.emplace_back(firstPt->x, firstPt->y); // close the ring + solution.push_back(lr); } -static void processPolynodeBranch(ClipperLib::PolyNode* polynode, GeometryCollection& rings) { - // Exterior ring. - rings.push_back(fromClipperPath(polynode->Contour)); - assert(signedArea(rings.back()) > 0); - - // Interior rings. - for (auto * ring : polynode->Childs) { - rings.push_back(fromClipperPath(ring->Contour)); - assert(signedArea(rings.back()) < 0); - } - - // PolyNodes may be nested in the case of a polygon inside a hole. - for (auto * ring : polynode->Childs) { - for (auto * subRing : ring->Childs) { - processPolynodeBranch(subRing, rings); +static void buildWagyuResults(GeometryCollection & solution, + mapbox::geometry::wagyu::ring_vector<std::int32_t>& rings) { + for (auto r : rings) { + if (r == nullptr) { + continue; + } + assert(r->points); + if (r->size() < 3) { + continue; + } + solution.emplace_back(); + pushWagyuRing(solution, r); + for (auto c : r->children) { + if (c == nullptr) { + continue; + } + assert(c->points); + if (c->size() < 3) { + continue; + } + pushWagyuRing(solution, c); + } + for (auto c : r->children) { + if (c == nullptr) { + continue; + } + if (!c->children.empty()) { + buildWagyuResults(solution, c->children); + } } } } GeometryCollection fixupPolygons(const GeometryCollection& rings) { - ClipperLib::Clipper clipper; - clipper.StrictlySimple(true); + using namespace mapbox::geometry::wagyu; + + // This is code that is pulled from the wagyu main class, we + // are doing this to have our own custom build result, + // rather then copying output twice from the wagyu algorithm. + + local_minimum_list<std::int32_t> minima_list; for (const auto& ring : rings) { - clipper.AddPath(toClipperPath(ring), ClipperLib::ptSubject, true); + // Convert ring to LinearRing type prior to adding them + add_linear_ring(toWagyuPath(ring), minima_list, polygon_type_subject); } - ClipperLib::PolyTree polygons; - clipper.Execute(ClipperLib::ctUnion, polygons, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd); - clipper.Clear(); + // Core part of wagyu algorithm + ring_manager<std::int32_t> manager; + + build_hot_pixels(minima_list, manager); + + execute_vatti(minima_list, manager, clip_type_union, fill_type_even_odd, fill_type_even_odd); + + correct_topology(manager); + // Finally lets build results GeometryCollection result; - for (auto * polynode : polygons.Childs) { - processPolynodeBranch(polynode, result); - } + + // This calls code based on wagyu/build_results.hpp + // rather then returning a multipolygon however, we are + // going to return a GeometryCollection + buildWagyuResults(result, manager.children); + return result; } |