Rotates the amount specified by the angle parameter. Angles must be specified in radians (values from 0 to 2 PI).
The coordinates are always rotated around their relative position to the origin. Positive numbers rotate objects in a clockwise direction and negative numbers rotate in the couterclockwise direction. Transformations apply to everything that happens afterward, and subsequent calls to the function compound the effect. For example, calling
pi 2.0 / Protate once and then calling
pi 2.0 / Protate a second time is the same as a single
Protate multiplies the current transformation matrix by a rotation matrix. This function can be further controlled by