Everybody Rotate!

By David Wall, ITworld |  News

Last week, we looked at the matrix-multiplication method that Java uses
to translate points from one place to another on coordinate planes
(i.e., the method used to move pixels around in windows). The technique
involves mathematical structures called affine transforms. They look
like this...

1 0 0
0 1 0
0 0 1

...and can be created in Java programs as AffineTransform objects. The
example above is called the identity affine transform, and it moves a
pixel nowhere. That's what you get when you create an AffineTransform
object with no arguments.

Affine transforms can perform rotations, too. To bring about a rotation
in two dimensions

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