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55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
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/*
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* Copyright 2010 Niels Kummerfeldt <niels.kummerfeldt@tu-harburg.de>
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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 2 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include "projection.h"
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#include <cmath>
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qreal Projection::lon2rawx(qreal lon)
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{
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return (lon + 180.0) / 360.0;
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}
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qreal Projection::lat2rawy(qreal lat)
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{
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return (1.0 - log(tan(lat * M_PI/180.0) + 1.0 / cos(lat * M_PI/180.0)) / M_PI) / 2.0;
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}
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qreal Projection::lon2tilex(qreal lon, int z)
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{
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return (lon + 180.0) / 360.0 * (1 << z);
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}
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qreal Projection::lat2tiley(qreal lat, int z)
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{
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return (1.0 - log(tan(lat * M_PI/180.0) + 1.0 / cos(lat * M_PI/180.0)) / M_PI) / 2.0 * (1 << z);
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}
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qreal Projection::tilex2lon(qreal x, int z)
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{
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return x / (1 << z) * 360.0 - 180;
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}
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qreal Projection::tiley2lat(qreal y, int z)
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{
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qreal n = M_PI - 2.0 * M_PI * y / (1 << z);
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return 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
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}
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