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Diffstat (limited to 'src/3rdparty/poly2tri/sweep/sweep.h')
| -rw-r--r-- | src/3rdparty/poly2tri/sweep/sweep.h | 285 |
1 files changed, 0 insertions, 285 deletions
diff --git a/src/3rdparty/poly2tri/sweep/sweep.h b/src/3rdparty/poly2tri/sweep/sweep.h deleted file mode 100644 index 9bb0b5d8..00000000 --- a/src/3rdparty/poly2tri/sweep/sweep.h +++ /dev/null @@ -1,285 +0,0 @@ -/* - * Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors - * http://code.google.com/p/poly2tri/ - * - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without modification, - * are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * * Neither the name of Poly2Tri nor the names of its contributors may be - * used to endorse or promote products derived from this software without specific - * prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ -/** - * Sweep-line, Constrained Delauney Triangulation (CDT) See: Domiter, V. and - * Zalik, B.(2008)'Sweep-line algorithm for constrained Delaunay triangulation', - * International Journal of Geographical Information Science - * - * "FlipScan" Constrained Edge Algorithm invented by Thomas Åhlén, thahlen@gmail.com - */ - -#ifndef SWEEP_H -#define SWEEP_H - -#include <vector> - -namespace p2t { - -class SweepContext; -struct Node; -struct Point; -struct Edge; -class Triangle; - -class Sweep -{ -public: - - /** - * Triangulate - * - * @param tcx - */ - void Triangulate(SweepContext& tcx); - - /** - * Destructor - clean up memory - */ - ~Sweep(); - -private: - - /** - * Start sweeping the Y-sorted point set from bottom to top - * - * @param tcx - */ - void SweepPoints(SweepContext& tcx); - - /** - * Find closes node to the left of the new point and - * create a new triangle. If needed new holes and basins - * will be filled to. - * - * @param tcx - * @param point - * @return - */ - Node& PointEvent(SweepContext& tcx, Point& point); - - /** - * - * - * @param tcx - * @param edge - * @param node - */ - void EdgeEvent(SweepContext& tcx, Edge* edge, Node* node); - - void EdgeEvent(SweepContext& tcx, Point& ep, Point& eq, Triangle* triangle, Point& point); - - /** - * Creates a new front triangle and legalize it - * - * @param tcx - * @param point - * @param node - * @return - */ - Node& NewFrontTriangle(SweepContext& tcx, Point& point, Node& node); - - /** - * Adds a triangle to the advancing front to fill a hole. - * @param tcx - * @param node - middle node, that is the bottom of the hole - */ - void Fill(SweepContext& tcx, Node& node); - - /** - * Returns true if triangle was legalized - */ - bool Legalize(SweepContext& tcx, Triangle& t); - - /** - * <b>Requirement</b>:<br> - * 1. a,b and c form a triangle.<br> - * 2. a and d is know to be on opposite side of bc<br> - * <pre> - * a - * + - * / \ - * / \ - * b/ \c - * +-------+ - * / d \ - * / \ - * </pre> - * <b>Fact</b>: d has to be in area B to have a chance to be inside the circle formed by - * a,b and c<br> - * d is outside B if orient2d(a,b,d) or orient2d(c,a,d) is CW<br> - * This preknowledge gives us a way to optimize the incircle test - * @param a - triangle point, opposite d - * @param b - triangle point - * @param c - triangle point - * @param d - point opposite a - * @return true if d is inside circle, false if on circle edge - */ - bool Incircle(Point& pa, Point& pb, Point& pc, Point& pd); - - /** - * Rotates a triangle pair one vertex CW - *<pre> - * n2 n2 - * P +-----+ P +-----+ - * | t /| |\ t | - * | / | | \ | - * n1| / |n3 n1| \ |n3 - * | / | after CW | \ | - * |/ oT | | oT \| - * +-----+ oP +-----+ - * n4 n4 - * </pre> - */ - void RotateTrianglePair(Triangle& t, Point& p, Triangle& ot, Point& op); - - /** - * Fills holes in the Advancing Front - * - * - * @param tcx - * @param n - */ - void FillAdvancingFront(SweepContext& tcx, Node& n); - - // Decision-making about when to Fill hole. - // Contributed by ToolmakerSteve2 - bool LargeHole_DontFill(Node* node); - bool AngleExceeds90Degrees(Point* origin, Point* pa, Point* pb); - bool AngleExceedsPlus90DegreesOrIsNegative(Point* origin, Point* pa, Point* pb); - double Angle(Point& origin, Point& pa, Point& pb); - - /** - * - * @param node - middle node - * @return the angle between 3 front nodes - */ - double HoleAngle(Node& node); - - /** - * The basin angle is decided against the horizontal line [1,0] - */ - double BasinAngle(Node& node); - - /** - * Fills a basin that has formed on the Advancing Front to the right - * of given node.<br> - * First we decide a left,bottom and right node that forms the - * boundaries of the basin. Then we do a reqursive fill. - * - * @param tcx - * @param node - starting node, this or next node will be left node - */ - void FillBasin(SweepContext& tcx, Node& node); - - /** - * Recursive algorithm to fill a Basin with triangles - * - * @param tcx - * @param node - bottom_node - * @param cnt - counter used to alternate on even and odd numbers - */ - void FillBasinReq(SweepContext& tcx, Node* node); - - bool IsShallow(SweepContext& tcx, Node& node); - - bool IsEdgeSideOfTriangle(Triangle& triangle, Point& ep, Point& eq); - - void FillEdgeEvent(SweepContext& tcx, Edge* edge, Node* node); - - void FillRightAboveEdgeEvent(SweepContext& tcx, Edge* edge, Node* node); - - void FillRightBelowEdgeEvent(SweepContext& tcx, Edge* edge, Node& node); - - void FillRightConcaveEdgeEvent(SweepContext& tcx, Edge* edge, Node& node); - - void FillRightConvexEdgeEvent(SweepContext& tcx, Edge* edge, Node& node); - - void FillLeftAboveEdgeEvent(SweepContext& tcx, Edge* edge, Node* node); - - void FillLeftBelowEdgeEvent(SweepContext& tcx, Edge* edge, Node& node); - - void FillLeftConcaveEdgeEvent(SweepContext& tcx, Edge* edge, Node& node); - - void FillLeftConvexEdgeEvent(SweepContext& tcx, Edge* edge, Node& node); - - void FlipEdgeEvent(SweepContext& tcx, Point& ep, Point& eq, Triangle* t, Point& p); - - /** - * After a flip we have two triangles and know that only one will still be - * intersecting the edge. So decide which to contiune with and legalize the other - * - * @param tcx - * @param o - should be the result of an orient2d( eq, op, ep ) - * @param t - triangle 1 - * @param ot - triangle 2 - * @param p - a point shared by both triangles - * @param op - another point shared by both triangles - * @return returns the triangle still intersecting the edge - */ - Triangle& NextFlipTriangle(SweepContext& tcx, int o, Triangle& t, Triangle& ot, Point& p, Point& op); - - /** - * When we need to traverse from one triangle to the next we need - * the point in current triangle that is the opposite point to the next - * triangle. - * - * @param ep - * @param eq - * @param ot - * @param op - * @return - */ - Point& NextFlipPoint(Point& ep, Point& eq, Triangle& ot, Point& op); - - /** - * Scan part of the FlipScan algorithm<br> - * When a triangle pair isn't flippable we will scan for the next - * point that is inside the flip triangle scan area. When found - * we generate a new flipEdgeEvent - * - * @param tcx - * @param ep - last point on the edge we are traversing - * @param eq - first point on the edge we are traversing - * @param flipTriangle - the current triangle sharing the point eq with edge - * @param t - * @param p - */ - void FlipScanEdgeEvent(SweepContext& tcx, Point& ep, Point& eq, Triangle& flip_triangle, Triangle& t, Point& p); - - void FinalizationPolygon(SweepContext& tcx); - - std::vector<Node*> nodes_; - -}; - -} - -#endif |