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Atan
Return the arc-tangent of the parameters
Declaration
float atan(float y, float x)
vec2 atan(vec2 y, vec2 x)
vec3 atan(vec3 y, vec3 x)
vec4 atan(vec4 y, vec4 x)
float atan(float y_over_x)
vec2 atan(vec2 y_over_x)
vec3 atan(vec3 y_over_x)
vec4 atan(vec4 y_over_x)
Parameters
y specify the numerator of the fraction whose arctangent to return.
x specify the denominator of the fraction whose arctangent to return.
y_over_x specify the fraction whose arctangent to return.
Description
atan() returns the angle whose trigonometric arctangent is y,x or y_over_x, depending on which overload is invoked. In the first overload, the signs of y and x are used to determine the quadrant that the angle lies in. The values returned by atan in this case are in the range -PI and PI. Results are undefined if x is zero.
For the second overload, atan() returns the angle whose tangent is y_over_x. Values returned in this case are in the range -PI to PI.
See Also
cos, acos, sin, asin, atan, Chapter 05: Shaping Functions, Chapter 06: Color