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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** 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 "qgeoprojection2d_p.h"
#include "qgeocoordinate.h"
#include "qdoublevector2d_p.h"
#include "qdoublevector3d_p.h"
#include <qnumeric.h>
QT_BEGIN_NAMESPACE
QGeoProjection2D::QGeoProjection2D(double baseHeight, double sideLength)
: baseHeight_(baseHeight), sideLength_(sideLength) {}
QGeoProjection2D::~QGeoProjection2D() {}
QDoubleVector3D QGeoProjection2D::coordToPoint(const QGeoCoordinate &coord) const
{
QDoubleVector2D m = coordToMercator(coord);
double z = baseHeight_;
if (!qIsNaN(coord.altitude()))
z += coord.altitude();
return QDoubleVector3D(m.x() * sideLength_, (1.0 - m.y()) * sideLength_, z);
}
QGeoCoordinate QGeoProjection2D::pointToCoord(const QDoubleVector3D &point) const
{
QDoubleVector2D m = QDoubleVector2D(point.x() / sideLength_, 1.0 - point.y() / sideLength_);
QGeoCoordinate coord = mercatorToCoord(m);
coord.setAltitude(point.z() - baseHeight_);
return coord;
}
QDoubleVector3D QGeoProjection2D::mercatorToPoint(const QDoubleVector2D &mercator) const
{
return QDoubleVector3D(mercator.x() * sideLength_, (1.0 - mercator.y()) * sideLength_, baseHeight_);
}
QDoubleVector2D QGeoProjection2D::pointToMercator(const QDoubleVector3D &point) const
{
return QDoubleVector2D(point.x() / sideLength_, 1.0 - (point.y() / sideLength_));
}
QGeoCoordinate QGeoProjection2D::interpolate(const QGeoCoordinate &start, const QGeoCoordinate &end, qreal progress)
{
if (start == end) {
if (progress < 0.5) {
return start;
} else {
return end;
}
}
QGeoCoordinate s2 = start;
s2.setAltitude(0.0);
QGeoCoordinate e2 = end;
e2.setAltitude(0.0);
QDoubleVector3D s = coordToPoint(s2);
QDoubleVector3D e = coordToPoint(e2);
double x = s.x();
if (sideLength_ / 2.0 < qAbs(e.x() - s.x())) {
// handle dateline crossing
} else {
x = (1.0 - progress) * s.x() + progress * e.x();
}
double y = (1.0 - progress) * s.y() + progress * e.y();
QGeoCoordinate result = pointToCoord(QDoubleVector3D(x, y, 0.0));
result.setAltitude((1.0 - progress) * start.altitude() + progress * end.altitude());
return result;
}
QT_END_NAMESPACE
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