67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
/*
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QAD - Qt ADvanced
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Ivan Pelipenko peri4ko@yandex.ru
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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 Lesser 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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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef osm_math_p_h
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#define osm_math_p_h
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#include <QPointF>
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#include <math.h>
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// lon -> -180..+180
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// lat -> -85.0511..+85.0511
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namespace OSM {
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inline double lng2x(double lon) {
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return (lon + 180.0) / 360.0;
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}
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inline double lat2y(double lat) {
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double latrad = lat * M_PI / 180.0;
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return (1.0 - asinh(tan(latrad)) / M_PI) / 2.0;
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}
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inline double x2lng(double x) {
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return x * 360.0 - 180;
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}
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inline double y2lat(double y) {
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double n = M_PI - 2.0 * M_PI * y;
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return 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
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}
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inline QPointF xy2geo(QPointF p) {
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return QPointF(y2lat(p.y()), x2lng(p.x()));
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}
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inline QPointF geo2xy(QPointF p) {
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return QPointF(lng2x(p.y()), lat2y(p.x()));
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}
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} // namespace OSM
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#endif
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