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30 lines
655 B
C++
30 lines
655 B
C++
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#include "osm.h"
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#define EPSILON 1e-6
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QPointF osm::ll2m(const Coordinates &c)
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{
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return QPointF(c.lon(), rad2deg(log(tan(M_PI_4 + deg2rad(c.lat())/2.0))));
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}
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Coordinates osm::m2ll(const QPointF &p)
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{
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return Coordinates(p.x(), rad2deg(2.0 * atan(exp(deg2rad(p.y()))) - M_PI_2));
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}
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QPoint osm::mercator2tile(const QPointF &m, int z)
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{
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return QPoint((int)(floor((m.x() + 180.0) / 360.0 * (1<<z))),
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(int)(floor((1.0 - (m.y() / 180.0)) / 2.0 * (1<<z))));
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}
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qreal osm::zoom2scale(int zoom)
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{
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return (360.0/(qreal)((1<<zoom) * TILE_SIZE));
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}
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int osm::scale2zoom(qreal scale)
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{
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return (int)(log2(360.0/(scale * (qreal)TILE_SIZE)) + EPSILON);
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}
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