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Diffstat (limited to 'src/location/quickmapitems/qdeclarativegeomapitemutils.cpp')
| -rw-r--r-- | src/location/quickmapitems/qdeclarativegeomapitemutils.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/location/quickmapitems/qdeclarativegeomapitemutils.cpp b/src/location/quickmapitems/qdeclarativegeomapitemutils.cpp new file mode 100644 index 00000000..db5189ee --- /dev/null +++ b/src/location/quickmapitems/qdeclarativegeomapitemutils.cpp @@ -0,0 +1,191 @@ +/**************************************************************************** +** +** Copyright (C) 2020 Paolo Angelelli <paolo.angelelli@gmail.com> +** Copyright (C) 2022 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtLocation module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 { + +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(); +} + +} // namespace QDeclarativeGeoMapItemUtils + +QT_END_NAMESPACE |