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replace fp divisions by multiplications

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This commit is contained in:
Dennis Luxen 2014-06-17 12:50:29 +02:00
parent 5d14016366
commit 604d2c698b
1 changed files with 2 additions and 2 deletions
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4
Util/MercatorUtil.h
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@ -32,12 +32,12 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
inline float y2lat(const float a) inline float y2lat(const float a)
{ {
return 180.f / static_cast<float>(M_PI) * (2.f * std::atan(std::exp(a * static_cast<float>(M_PI) / 180.f)) - static_cast<float>(M_PI) / 2.f); return 180.f * static_cast<float>(M_1_PI) * (2.f * std::atan(std::exp(a * static_cast<float>(M_PI) / 180.f)) - static_cast<float>(M_PI_2));
} }
inline float lat2y(const float a) inline float lat2y(const float a)
{ {
return 180.f / static_cast<float>(M_PI) * std::log(std::tan(static_cast<float>(M_PI) / 4.f + a * (static_cast<float>(M_PI) / 180.f) / 2.f)); return 180.f * static_cast<float>(M_1_PI) * std::log(std::tan(static_cast<float>(M_PI_4) + a * (static_cast<float>(M_PI) / 180.f) / 2.f));
} }
#endif // MERCATOR_UTIL_H #endif // MERCATOR_UTIL_H