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Diffstat (limited to 'src/location/maps/qgeoprojection.cpp')
-rw-r--r-- | src/location/maps/qgeoprojection.cpp | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/location/maps/qgeoprojection.cpp b/src/location/maps/qgeoprojection.cpp new file mode 100644 index 00000000..4561af7d --- /dev/null +++ b/src/location/maps/qgeoprojection.cpp @@ -0,0 +1,117 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtLocation module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 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 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ +#include "qgeoprojection_p.h" + +#include "qgeocoordinate.h" + +#include <qvector2d.h> +#include <qvector3d.h> +#include <QMatrix4x4> +#include <qnumeric.h> + +#include <cmath> + +QGeoProjection::QGeoProjection() {} + +QGeoProjection::~QGeoProjection() {} + +QVector3D QGeoProjection::mercatorToPoint(const QVector2D &mercator) const +{ + return this->coordToPoint(mercatorToCoord(mercator)); +} + +QVector2D QGeoProjection::pointToMercator(const QVector3D &point) const +{ + return coordToMercator(this->pointToCoord(point)); +} + +QVector2D QGeoProjection::coordToMercator(const QGeoCoordinate &coord) const +{ + const double pi = M_PI; + + double lon = coord.longitude() / 360.0 + 0.5; + + double lat = coord.latitude(); + lat = 0.5 - (log(tan((pi / 4.0) + (pi / 2.0) * lat / 180.0)) / pi) / 2.0; + lat = qMax(0.0, lat); + lat = qMin(1.0, lat); + + return QVector2D(lon, lat); +} + +double QGeoProjection::realmod(const double a, const double b) +{ + quint64 div = static_cast<quint64>(a / b); + return a - static_cast<double>(div) * b; +} + +QGeoCoordinate QGeoProjection::mercatorToCoord(const QVector2D &mercator) const +{ + 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 * atan(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); +} |