GM_CalcBearing

Calculates the bearing in radians between two points.

Syntax

C++
Copy 
GM_Error_t32 GM_CalcBearing
(
double  aFromX,     // IN: start X/longitude coordinate
double  aFromY,     // IN: start Y/latitude coordinate
double  aToX,       // IN: stop X/longitude coordinate
double  aToY,       // IN: stop Y/latitude coordinate
boolean aLatLon,    // IN: TRUE - coordinates are lat/lon, FALSE - coordinates are in the current projection?
double* aBearing    // OUT: bearing in radians between the points
);

Remarks

The points can either be specified as lat/lon values or in the current projection. The bearing retrieved is a cartographic bearing, with 0 being north, PI / 2 being east, PI being south, and 3 * PI / 2 being west.