1127: Mainline

Using the rotate method, you can produce an affine transform that rotates by an angle expressed in radians. For example, if you wish to rotate by 90°, counterclockwise, you rotate by -pi/2 radians.

Conveniently, the Math class provides a value for pi as the value of a class variable, Math.PI. Thus, to create an affine transform for a 90° counterclockwise rotation, you write the following statements:

AffineTransform transform = new AffineTransform();  
transform.rotate(- Math.PI / 2);