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56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
#include "rd.h"
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#include "wgs84.h"
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#include "coordinates.h"
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#define MIN_LAT deg2rad(-90.0)
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#define MAX_LAT deg2rad(90.0)
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#define MIN_LON deg2rad(-180.0)
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#define MAX_LON deg2rad(180.0)
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qreal Coordinates::distanceTo(const Coordinates &c) const
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{
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qreal dLat = deg2rad(c.lat() - _lat);
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qreal dLon = deg2rad(c.lon() - _lon);
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qreal a = pow(sin(dLat / 2.0), 2.0)
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+ cos(deg2rad(_lat)) * cos(deg2rad(c.lat())) * pow(sin(dLon / 2.0), 2.0);
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return (WGS84_RADIUS * (2.0 * atan2(sqrt(a), sqrt(1.0 - a))));
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}
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QDebug operator<<(QDebug dbg, const Coordinates &coordinates)
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{
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dbg.nospace() << "Coordinates(" << coordinates.lon() << ", "
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<< coordinates.lat() << ")";
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return dbg.space();
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}
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QPair<Coordinates, Coordinates> Coordinates::boundingRect(qreal distance) const
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{
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qreal radDist = distance / WGS84_RADIUS;
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qreal minLat = deg2rad(_lat) - radDist;
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qreal maxLat = deg2rad(_lat) + radDist;
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qreal minLon, maxLon;
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if (minLat > MIN_LAT && maxLat < MAX_LAT) {
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qreal deltaLon = asin(sin(radDist) / cos(_lat));
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minLon = deg2rad(_lon) - deltaLon;
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if (minLon < MIN_LON)
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minLon += 2.0 * M_PI;
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maxLon = deg2rad(_lon) + deltaLon;
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if (maxLon > MAX_LON)
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maxLon -= 2.0 * M_PI;
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} else {
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// a pole is within the distance
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minLat = qMax(minLat, MIN_LAT);
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maxLat = qMin(maxLat, MAX_LAT);
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minLon = MIN_LON;
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maxLon = MAX_LON;
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}
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return QPair<Coordinates, Coordinates>(Coordinates(rad2deg(qMin(minLon,
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maxLon)), rad2deg(qMin(minLat, maxLat))), Coordinates(rad2deg(qMax(minLon,
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maxLon)), rad2deg(qMax(minLat, maxLat))));
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}
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