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// Copyright (C) 2020 Paolo Angelelli <paolo.angelelli@gmail.com>
// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qdeclarativegeomapitemutils_p.h"
#include <QPointF>
#include <QMatrix4x4>
#include <QPainterPath>
#include <QPainterPathStroker>
#include <QtPositioning/QGeoCoordinate>
#include <QtPositioning/private/qclipperutils_p.h>
QT_BEGIN_NAMESPACE
namespace QDeclarativeGeoMapItemUtils {
double distanceSqrPointLine(double p0_x
, double p0_y
, double p1_x
, double p1_y
, double p2_x
, double p2_y)
{
const double t_x = p2_x - p1_x;
const double t_y = p2_y - p1_y;
const double p_x = p0_x - p1_x;
const double p_y = p0_y - p1_y;
const double tsqr = t_x * t_x + t_y * t_y;
if (tsqr == 0)
return qInf();
double alpha = (p_x * t_x + p_y * t_y) / tsqr;
alpha = qBound<double>(0, alpha, 1);
const double dx = p_x - t_x * alpha;
const double dy = p_y - t_y * alpha;
return dx * dx + dy * dy;
}
void wrapPath(const QList<QGeoCoordinate> &perimeter,
const QGeoCoordinate &geoLeftBound,
const QGeoProjectionWebMercator &p,
QList<QDoubleVector2D> &wrappedPath,
QList<QDoubleVector2D> &wrappedPathMinus1,
QList<QDoubleVector2D> &wrappedPathPlus1,
QDoubleVector2D *leftBoundWrapped)
{
QList<QDoubleVector2D> path;
for (const QGeoCoordinate &c : perimeter)
path << p.geoToMapProjection(c);
const QDoubleVector2D leftBound = p.geoToMapProjection(geoLeftBound);
wrappedPath.clear();
wrappedPathPlus1.clear();
wrappedPathMinus1.clear();
// compute 3 sets of "wrapped" coordinates: one w regular mercator, one w regular mercator +- 1.0
for (QDoubleVector2D coord : path) {
// We can get NaN if the map isn't set up correctly, or the projection
// is faulty -- probably best thing to do is abort
if (!qIsFinite(coord.x()) || !qIsFinite(coord.y()))
return;
const bool isPointLessThanUnwrapBelowX = (coord.x() < leftBound.x());
// unwrap x to preserve geometry if moved to border of map
if (isPointLessThanUnwrapBelowX)
coord.setX(coord.x() + 1.0);
QDoubleVector2D coordP1(coord.x() + 1.0, coord.y());
QDoubleVector2D coordM1(coord.x() - 1.0, coord.y());
wrappedPath.append(coord);
wrappedPathPlus1.append(coordP1);
wrappedPathMinus1.append(coordM1);
}
if (leftBoundWrapped)
*leftBoundWrapped = leftBound;
}
void wrapPath(const QList<QGeoCoordinate> &perimeter,
const QGeoCoordinate &geoLeftBound,
const QGeoProjectionWebMercator &p,
QList<QDoubleVector2D> &wrappedPath,
QDoubleVector2D *leftBoundWrapped)
{
QList<QDoubleVector2D> path;
for (const QGeoCoordinate &c : perimeter)
path << p.geoToMapProjection(c);
const QDoubleVector2D leftBound = p.geoToMapProjection(geoLeftBound);
wrapPath(path, leftBound,wrappedPath);
if (leftBoundWrapped)
*leftBoundWrapped = leftBound;
}
void wrapPath(const QList<QDoubleVector2D> &path,
const QDoubleVector2D &geoLeftBound,
QList<QDoubleVector2D> &wrappedPath)
{
wrappedPath.clear();
// compute 3 sets of "wrapped" coordinates: one w regular mercator, one w regular mercator +- 1.0
for (QDoubleVector2D coord : path) {
// We can get NaN if the map isn't set up correctly, or the projection
// is faulty -- probably best thing to do is abort
if (!qIsFinite(coord.x()) || !qIsFinite(coord.y()))
return;
const bool isPointLessThanUnwrapBelowX = (coord.x() < geoLeftBound.x());
// unwrap x to preserve geometry if moved to border of map
if (isPointLessThanUnwrapBelowX)
coord.setX(coord.x() + 1.0);
wrappedPath.append(coord);
}
}
void clipPolygon(const QList<QDoubleVector2D> &wrappedPath,
const QGeoProjectionWebMercator &p,
QList<QList<QDoubleVector2D>> &clippedPaths,
QDoubleVector2D *leftBoundWrapped,
bool closed)
{
// 2) Clip bounding box
clippedPaths.clear();
const QList<QDoubleVector2D> &visibleRegion = p.projectableGeometry();
if (visibleRegion.size()) {
QClipperUtils clipper;
clipper.addSubjectPath(wrappedPath, closed);
clipper.addClipPolygon(visibleRegion);
clippedPaths = clipper.execute(QClipperUtils::Intersection, QClipperUtils::pftEvenOdd,
QClipperUtils::pftEvenOdd);
if (leftBoundWrapped) {
// 2.1) update srcOrigin_ and leftBoundWrapped with the point with minimum X
QDoubleVector2D lb(qInf(), qInf());
for (const QList<QDoubleVector2D> &path : clippedPaths) {
for (const QDoubleVector2D &p : path) {
if (p.x() < lb.x() || (p.x() == lb.x() && p.y() < lb.y()))
// y-minimization needed to find the same point on polygon and border
lb = p;
}
}
if (qIsInf(lb.x())) // e.g., when the polygon is clipped entirely
return;
// 2.2) Prevent the conversion to and from clipper from introducing tiny negative offsets which,
// in turn will make the geometry wrap around.
lb.setX(qMax(leftBoundWrapped->x(), lb.x()));
*leftBoundWrapped = lb;
// srcOrigin_ = p.mapProjectionToGeo(p.unwrapMapProjection(lb));
}
} else {
clippedPaths.append(wrappedPath);
}
}
void projectBbox(const QList<QDoubleVector2D> &clippedBbox,
const QGeoProjectionWebMercator &p,
QPainterPath &projectedBbox)
{
projectedBbox.clear();
bool first = true;
for (const auto &coord : clippedBbox) {
QDoubleVector2D point = p.wrappedMapProjectionToItemPosition(coord);
if (first) {
first = false;
projectedBbox.moveTo(point.toPointF());
} else {
projectedBbox.lineTo(point.toPointF());
}
}
projectedBbox.closeSubpath();
}
QRectF boundingRectangleFromList(const QList<QDoubleVector2D> &list)
{
double xMin = qInf();
double xMax = -qInf();
double yMin = qInf();
double yMax = -qInf();
for (const auto &coord : list) {
xMin = qMin(xMin, coord.x());
xMax = qMax(xMax, coord.x());
yMin = qMin(yMin, coord.y());
yMax = qMax(yMax, coord.y());
}
return QRectF(xMin, yMin, xMax - xMin, yMax - yMin);
}
} // namespace QDeclarativeGeoMapItemUtils
QT_END_NAMESPACE
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