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76 lines
1.1 KiB
C++
76 lines
1.1 KiB
C++
#include "primemeridian.h"
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static double shift(double lon, double offset)
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{
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double ret = lon + offset;
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if (ret > 180.0)
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ret -= 360.0;
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if (ret < -180)
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ret += 360.0;
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return ret;
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}
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PrimeMeridian::PrimeMeridian(int code)
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{
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switch (code) {
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case 8901:
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_pm = 0.0;
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break;
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case 8902:
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_pm = -9.1319061111;
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break;
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case 8903:
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_pm = 2.3372291666;
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break;
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case 8904:
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_pm = -74.0809166666;
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break;
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case 8905:
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_pm = -3.6879388888;
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break;
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case 8906:
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_pm = 12.4523333333;
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break;
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case 8907:
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_pm = 7.4395833333;
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break;
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case 8908:
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_pm = 106.8077194444;
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break;
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case 8909:
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_pm = -17.6666666666;
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break;
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case 8910:
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_pm = 4.3679750000;
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break;
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case 8911:
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_pm = 18.0582777777;
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break;
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case 8913:
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_pm = 10.7229166666;
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break;
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default:
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_pm = NAN;
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}
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}
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double PrimeMeridian::toGreenwich(double val) const
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{
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return shift(val, _pm);
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}
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double PrimeMeridian::fromGreenwich(double val) const
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{
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return shift(val, -_pm);
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}
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#ifndef QT_NO_DEBUG
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QDebug operator<<(QDebug dbg, const PrimeMeridian &pm)
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{
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dbg.nospace() << "PrimeMeridian(" << pm._pm << ")";
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return dbg.space();
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}
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#endif // QT_NO_DEBUG
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