function ArcTan2(Y, X: Double): Double
function ArcTan2(Y, X: Integer): Double
The ArcTan2 function returns a value between -Pi and Pi radians that specifies the counter-clockwise angle between the positive X axis and the point represented by the X and Y input parameters.
Examples
X := ArcTan2(100,3000); // X is 0.033320995878247196