98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
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/**
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******************************************************************************
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*
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* @file mercatorprojection.cpp
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
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* @brief
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* @see The GNU Public License (GPL) Version 3
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* @defgroup OPMapWidget
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* @{
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mercatorprojection.h"
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namespace projections {
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MercatorProjection::MercatorProjection() : MinLatitude(-85.05112878), MaxLatitude(85.05112878), MinLongitude(-177),
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MaxLongitude(177), tileSize(256, 256)
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{}
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Point MercatorProjection::FromLatLngToPixel(double lat, double lng, const int &zoom)
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{
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Point ret; // = Point.Empty;
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lat = Clip(lat, MinLatitude, MaxLatitude);
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lng = Clip(lng, MinLongitude, MaxLongitude);
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double x = (lng + 180) / 360;
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double sinLatitude = sin(lat * M_PI / 180);
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double y = 0.5 - log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * M_PI);
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Size s = GetTileMatrixSizePixel(zoom);
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int mapSizeX = s.Width();
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int mapSizeY = s.Height();
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ret.SetX((int)Clip(x * mapSizeX + 0.5, 0, mapSizeX - 1));
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ret.SetY((int)Clip(y * mapSizeY + 0.5, 0, mapSizeY - 1));
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return ret;
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}
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internals::PointLatLng MercatorProjection::FromPixelToLatLng(const int &x, const int &y, const int &zoom)
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{
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internals::PointLatLng ret; // = internals::PointLatLng.Empty;
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Size s = GetTileMatrixSizePixel(zoom);
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double mapSizeX = s.Width();
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double mapSizeY = s.Height();
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double xx = (Clip(x, 0, mapSizeX - 1) / mapSizeX) - 0.5;
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double yy = 0.5 - (Clip(y, 0, mapSizeY - 1) / mapSizeY);
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ret.SetLat(90 - 360 * atan(exp(-yy * 2 * M_PI)) / M_PI);
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ret.SetLng(360 * xx);
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return ret;
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}
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double MercatorProjection::Clip(const double &n, const double &minValue, const double &maxValue) const
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{
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return qMin(qMax(n, minValue), maxValue);
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}
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Size MercatorProjection::TileSize() const
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{
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return tileSize;
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}
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double MercatorProjection::Axis() const
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{
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return 6378137;
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}
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double MercatorProjection::Flattening() const
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{
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return 1.0 / 298.257223563;
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}
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Size MercatorProjection::GetTileMatrixMaxXY(const int &zoom)
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{
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Q_UNUSED(zoom);
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int xy = (1 << zoom);
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return Size(xy - 1, xy - 1);
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}
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Size MercatorProjection::GetTileMatrixMinXY(const int &zoom)
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{
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Q_UNUSED(zoom);
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return Size(0, 0);
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}
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}
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