atan2()

float atan2(float y, float x)

Compute the arctangent of y/x. This is more stable than atan() since it can use the signs of y and x to determine the quadrant the angle is in. It also handles the case where x is zero correctly, returning 90 or -90.

Examples

atan2(1, 0) = 90

atan2(0, 1) = 0

atan2(0, -1) = 180

See Also

acos(), asin(), atan(), cos(), cosh(), sin(), sinh(), tan(), tanh()