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-rw-r--r--src/positioning/qwebmercator.cpp136
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diff --git a/src/positioning/qwebmercator.cpp b/src/positioning/qwebmercator.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtPositioning 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 "qwebmercator_p.h"
-
-#include "qgeocoordinate.h"
-
-#include <qnumeric.h>
-#include <qmath.h>
-
-#include "qdoublevector2d_p.h"
-#include "qdoublevector3d_p.h"
-
-QT_BEGIN_NAMESPACE
-
-QDoubleVector2D QWebMercator::coordToMercator(const QGeoCoordinate &coord)
-{
- const double pi = M_PI;
-
- double lon = coord.longitude() / 360.0 + 0.5;
-
- double lat = coord.latitude();
- lat = 0.5 - (std::log(std::tan((pi / 4.0) + (pi / 2.0) * lat / 180.0)) / pi) / 2.0;
- lat = qBound(0.0, lat, 1.0);
-
- return QDoubleVector2D(lon, lat);
-}
-
-double QWebMercator::realmod(const double a, const double b)
-{
- quint64 div = static_cast<quint64>(a / b);
- return a - static_cast<double>(div) * b;
-}
-
-QGeoCoordinate QWebMercator::mercatorToCoord(const QDoubleVector2D &mercator)
-{
- const double pi = M_PI;
-
- double fx = mercator.x();
- double fy = mercator.y();
-
- if (fy < 0.0)
- fy = 0.0;
- else if (fy > 1.0)
- fy = 1.0;
-
- double lat;
-
- if (fy == 0.0)
- lat = 90.0;
- else if (fy == 1.0)
- lat = -90.0;
- else
- lat = (180.0 / pi) * (2.0 * std::atan(std::exp(pi * (1.0 - 2.0 * fy))) - (pi / 2.0));
-
- double lng;
- if (fx >= 0) {
- lng = realmod(fx, 1.0);
- } else {
- lng = realmod(1.0 - realmod(-1.0 * fx, 1.0), 1.0);
- }
-
- lng = lng * 360.0 - 180.0;
-
- return QGeoCoordinate(lat, lng, 0.0);
-}
-
-QGeoCoordinate QWebMercator::coordinateInterpolation(const QGeoCoordinate &from, const QGeoCoordinate &to, qreal progress)
-{
- QDoubleVector2D s = QWebMercator::coordToMercator(from);
- QDoubleVector2D e = QWebMercator::coordToMercator(to);
-
- double x;
-
- if (0.5 < qAbs(e.x() - s.x())) {
- // handle dateline crossing
- double ex = e.x();
- double sx = s.x();
- if (ex < sx)
- sx -= 1.0;
- else if (sx < ex)
- ex -= 1.0;
-
- x = (1.0 - progress) * sx + progress * ex;
-
- if (!qFuzzyIsNull(x) && (x < 0.0))
- x += 1.0;
-
- } else {
- x = (1.0 - progress) * s.x() + progress * e.x();
- }
-
- double y = (1.0 - progress) * s.y() + progress * e.y();
-
- QGeoCoordinate result = QWebMercator::mercatorToCoord(QDoubleVector2D(x, y));
- result.setAltitude((1.0 - progress) * from.altitude() + progress * to.altitude());
-
- return result;
-}
-
-QT_END_NAMESPACE