atan2()

IMPORT_C double atan2(double, double);

Description

Calculate arctangent, 2 parameters. Performs the trigonometric arctangent operation on y/x and returns an angle in the range from -PI to PI expressed in radians, using the signs of the parameters to determine the quadrant. The result is valid even if arg2 is 0 (angle is PI/2 or -PI/2). In fact this function returns the angle of bidimensional vector (arg2,arg1).

Parameters

double and arg2.Values from whose division has to be calculated the arctangent.i.e.: Coordinates for the vector whose angle is to be calculated. double

Return value

double Arctangent of arg1/arg2.