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Diffstat (limited to 'src/location/declarativemaps/qgeosimplify_p.h')
-rw-r--r-- | src/location/declarativemaps/qgeosimplify_p.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/location/declarativemaps/qgeosimplify_p.h b/src/location/declarativemaps/qgeosimplify_p.h new file mode 100644 index 00000000..19445552 --- /dev/null +++ b/src/location/declarativemaps/qgeosimplify_p.h @@ -0,0 +1,147 @@ +/**************************************************************************** +** +** Qt adaptation of geosimplify.js, https://github.com/mapbox/geosimplify-js, (c) 2017, Mapbox +** +** Copyright (C) 2020 Paolo Angelelli <paolo.angelelli@gmail.com> +** Copyright (C) 2020 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the QtLocation module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** 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 http://www.qt.io/terms-conditions. For further +** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free +** Software Foundation and appearing in the file LICENSE.GPL included in +** the packaging of this file. Please review the following information to +** ensure the GNU General Public License version 2.0 requirements will be +** met: http://www.gnu.org/licenses/gpl-2.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QGEOSIMPLIFY_P_H +#define QGEOSIMPLIFY_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include <QtPositioning/QGeoCoordinate> +#include <QtPositioning/private/qdoublevector2d_p.h> +#include <QtPositioning/private/qwebmercator_p.h> + +QT_BEGIN_NAMESPACE + +class QGeoSimplify { +protected: + // Distance between two points in metres + static double getDist(const QGeoCoordinate &p1, const QGeoCoordinate &p2); + + // p, a and b are intended as "unwrapped" around the left bound + static QDoubleVector2D closestPoint( const QDoubleVector2D &p, + const QDoubleVector2D &a, + const QDoubleVector2D &b); + + static QGeoCoordinate closestPoint( const QGeoCoordinate &pc, + const QGeoCoordinate &ac, + const QGeoCoordinate &bc, + const double &leftBound); + + // Distance from a point to a segment (line between two points) in metres + static double getSegDist(const QGeoCoordinate &pc, + const QGeoCoordinate &ac, + const QGeoCoordinate &bc, + const double &leftBound); + + // doublevectors Intended as wrapped + static double getSegDist(const QDoubleVector2D &p, + const QDoubleVector2D &a, + const QDoubleVector2D &b, + const double &leftBound); + + static void simplifyDPStep(const QList<QGeoCoordinate> &points, + const double &leftBound, + int first, + int last, + double offsetTolerance, + QList<QGeoCoordinate> &simplified); + + static double getDist(QDoubleVector2D a, + QDoubleVector2D b, + const double &leftBound); + + static void simplifyDPStep(const QList<QDoubleVector2D> &points, + const double &leftBound, + int first, + int last, + double offsetTolerance, + QList<QDoubleVector2D> &simplified); + + static void simplifyDPStepZL(const QList<QDoubleVector2D> &points, + const double &leftBound, + int first, + int last, + int zoomLevel, + QList<QDoubleVector2D> &simplified); + + // simplification using Ramer-Douglas-Peucker algorithm + static QList<QGeoCoordinate> simplifyDouglasPeucker(const QList<QGeoCoordinate> &points, + const double &leftBound, + double offsetTolerance); + + static QList<QDoubleVector2D> simplifyDouglasPeucker(const QList<QDoubleVector2D> &points, + const double &leftBound, + double offsetTolerance); + + static QList<QDoubleVector2D> simplifyDouglasPeuckerZL(const QList<QDoubleVector2D> &points, + const double &leftBound, + int zoomLevel); + +public: + /* + offsetTolerance - how far outside the straight line a point + needs to be for it to be "kept" + */ + static QList<QGeoCoordinate> geoSimplify(const QList<QGeoCoordinate> &points, + const double &leftBound, + double offsetTolerance); // in meters + + static QList<QDoubleVector2D> geoSimplify(const QList<QDoubleVector2D> &points, + const double &leftBound, + double offsetTolerance); // in meters + + // This overload tries to be adaptive in the offsetTolerance across latitudes, + // and return a simplification adequate for the given zoomLevel. + static QList<QDoubleVector2D> geoSimplifyZL(const QList<QDoubleVector2D> &points, + const double &leftBound, + int zoomLevel); // in meters +}; + +QT_END_NAMESPACE + +#endif // QGEOSIMPLIFY_P_H |