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Consolidate math functions

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This commit is contained in:
Patrick Niklaus
2016-03-16 21:54:29 +01:00
parent 5c01878542
commit 50738f8ce0
4 changed files with 179 additions and 204 deletions
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include/util/coordinate_calculation.hpp
+23 -5
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@@ -3,20 +3,34 @@
#include "util/coordinate.hpp"
#include <boost/math/constants/constants.hpp>
#include <utility>
namespace osrm
{
namespace util
{
namespace coordinate_calculation
{
const constexpr long double RAD = 0.017453292519943295769236907684886;
const constexpr long double DEGREE_TO_RAD = 0.017453292519943295769236907684886;
const constexpr long double RAD_TO_DEGREE = 1. / DEGREE_TO_RAD;
// earth radius varies between 6,356.750-6,378.135 km (3,949.901-3,963.189mi)
// The IUGG value for the equatorial radius is 6378.137 km (3963.19 miles)
const constexpr long double EARTH_RADIUS = 6372797.560856;
// radius used by WGS84
const constexpr double EARTH_RADIUS_WGS84 = 6378137.0;
namespace coordinate_calculation
namespace detail
{
// earth circumference devided by 2
const constexpr double MAXEXTENT = EARTH_RADIUS_WGS84 * boost::math::constants::pi<double>();
// ^ math functions are not constexpr since they have side-effects (setting errno) :(
const double MAX_LATITUDE = RAD_TO_DEGREE * (2.0 * std::atan(std::exp(180.0 * DEGREE_TO_RAD)) - boost::math::constants::half_pi<double>());
const constexpr double MAX_LONGITUDE = 180.0;
}
//! Projects both coordinates and takes the euclidean distance of the projected points
// Does not return meters!
@@ -50,9 +64,6 @@ double perpendicularDistanceFromProjectedCoordinate(
Coordinate &nearest_location,
double &ratio);
double degToRad(const double degree);
double radToDeg(const double radian);
double bearing(const Coordinate first_coordinate, const Coordinate second_coordinate);
// Get angle of line segment (A,C)->(C,B)
@@ -64,8 +75,15 @@ Coordinate interpolateLinear(double factor, const Coordinate from, const Coordin
namespace mercator
{
// This is the global default tile size for all Mapbox Vector Tiles
const constexpr double TILE_SIZE = 256.0;
// Converts projected mercator degrees to PX
const constexpr double DEGREE_TO_PX = detail::MAXEXTENT / 180.0;
FloatLatitude yToLat(const double value);
double latToY(const FloatLatitude latitude);
void xyzToMercator(const int x, const int y, const int z, double &minx, double &miny, double &maxx, double &maxy);
void xyzToWSG84(const int x, const int y, const int z, double &minx, double &miny, double &maxx, double &maxy);
} // ns mercator
} // ns coordinate_calculation
} // ns util