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77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
#include <cmath>
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#include "ll.h"
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// MSVC workarounds
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif // M_PI
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#if defined(_MSC_VER) && (_MSC_VER < 1800)
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#define log2(n) (log(n)/log(2.0))
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#endif
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#define WGS84_RADIUS 6378137.0
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#define deg2rad(d) (((d)*M_PI)/180.0)
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#define rad2deg(d) (((d)*180.0)/M_PI)
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qreal llDistance(const QPointF &p1, const QPointF &p2)
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{
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qreal dLat = deg2rad(p2.y() - p1.y());
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qreal dLon = deg2rad(p2.x() - p1.x());
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qreal a = pow(sin(dLat / 2.0), 2.0)
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+ cos(deg2rad(p1.y())) * cos(deg2rad(p2.y())) * pow(sin(dLon / 2.0), 2.0);
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qreal c = 2.0 * atan2(sqrt(a), sqrt(1.0 - a));
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return (WGS84_RADIUS * c);
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}
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QPointF ll2mercator(const QPointF &ll)
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{
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QPointF m;
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m.setX(ll.x());
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m.setY(rad2deg(log(tan(M_PI/4.0 + deg2rad(ll.y())/2.0))));
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return m;
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}
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QPoint mercator2tile(const QPointF &m, int z)
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{
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QPoint tile;
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tile.setX((int)(floor((m.x() + 180.0) / 360.0 * pow(2.0, z))));
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tile.setY((int)(floor((1.0 - (m.y() / 180.0)) / 2.0 * pow(2.0, z))));
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return tile;
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}
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QPointF tile2mercator(const QPoint &tile, int z)
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{
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QPointF m;
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m.setX(tile.x() / pow(2.0, z) * 360.0 - 180);
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qreal n = M_PI - 2.0 * M_PI * tile.y() / pow(2.0, z);
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m.setY(rad2deg(atan(0.5 * (exp(n) - exp(-n)))));
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return ll2mercator(m);
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}
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int scale2zoom(qreal scale)
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{
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int zoom;
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zoom = (int)log2(360.0/(scale * (qreal)TILE_SIZE));
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if (zoom < ZOOM_MIN)
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return ZOOM_MIN;
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if (zoom > ZOOM_MAX)
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return ZOOM_MAX;
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return zoom;
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}
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qreal zoom2resolution(int zoom, qreal y)
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{
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return (WGS84_RADIUS * 2 * M_PI / 256 * cos(2 * atan(exp(deg2rad(y)))
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- M_PI/2)) / pow(2.0, zoom);
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}
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