transformation matrix for touchscreen rotations

It makes a lot more sense represented two dimensionally.

Identity:

⎡ 1 0 0 ⎤
⎜ 0 1 0 ⎥
⎣ 0 0 1 ⎦

Right rotation:

⎡  0 1 0 ⎤
⎜ -1 0 1 ⎥
⎣  0 0 1 ⎦

Left rotation:

⎡ 0 -1 1 ⎤
⎜ 1  0 0 ⎥
⎣ 0  0 1 ⎦

This is how I came up with values for my rotate script.

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