112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/**
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******************************************************************************
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*
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* @file mercatorprojectionyandex.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 "mercatorprojectionyandex.h"
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namespace projections {
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MercatorProjectionYandex::MercatorProjectionYandex() : MinLatitude(-85.05112878), MaxLatitude(85.05112878), MinLongitude(-177),
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MaxLongitude(177), RAD_DEG(180 / M_PI), DEG_RAD(M_PI / 180), MathPiDiv4(M_PI / 4), tileSize(256, 256)
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{}
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Point MercatorProjectionYandex::FromLatLngToPixel(double lat, double lng, const int &zoom)
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{
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lat = Clip(lat, MinLatitude, MaxLatitude);
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lng = Clip(lng, MinLongitude, MaxLongitude);
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double rLon = lng * DEG_RAD; // Math.PI / 180;
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double rLat = lat * DEG_RAD; // Math.PI / 180;
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double a = 6378137;
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double k = 0.0818191908426;
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double z = tan(MathPiDiv4 + rLat / 2) / pow((tan(MathPiDiv4 + asin(k * sin(rLat)) / 2)), k);
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double z1 = pow(2, 23 - zoom);
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double DX = ((20037508.342789 + a * rLon) * 53.5865938 / z1);
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double DY = ((20037508.342789 - a * log(z)) * 53.5865938 / z1);
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Point ret; // = Point.Empty;
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ret.SetX((int)DX);
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ret.SetY((int)DY);
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return ret;
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}
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internals::PointLatLng MercatorProjectionYandex::FromPixelToLatLng(const int &x, const int &y, const int &zoom)
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{
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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 a = 6378137;
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double c1 = 0.00335655146887969;
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double c2 = 0.00000657187271079536;
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double c3 = 0.00000001764564338702;
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double c4 = 0.00000000005328478445;
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double z1 = (23 - zoom);
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double mercX = (x * pow(2, z1)) / 53.5865938 - 20037508.342789;
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double mercY = 20037508.342789 - (y * pow(2, z1)) / 53.5865938;
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double g = M_PI / 2 - 2 * atan(1 / exp(mercY / a));
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double z = g + c1 * sin(2 * g) + c2 * sin(4 * g) + c3 * sin(6 * g) + c4 * sin(8 * g);
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internals::PointLatLng ret; // = internals::PointLatLng.Empty;
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ret.SetLat(z * RAD_DEG);
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ret.SetLng(mercX / a * RAD_DEG);
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return ret;
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}
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double MercatorProjectionYandex::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 MercatorProjectionYandex::TileSize() const
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{
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return tileSize;
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}
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double MercatorProjectionYandex::Axis() const
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{
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return 6356752.3142;
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}
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double MercatorProjectionYandex::Flattening() const
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{
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return 1.0 / 298.257223563;
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}
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Size MercatorProjectionYandex::GetTileMatrixMaxXY(const int &zoom)
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{
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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 MercatorProjectionYandex::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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