2d Affine Inverse Transform
- From: "daver" <daveroach@xxxxxxxxxxxx>
- Date: 23 Dec 2005 12:24:45 -0800
Hi everyone.
I am looking for an algorithm that can take 4 points that define a
parallelogram and determine the angle of rotation about it's center and
alpha, beta skewing angles in x and y direction in degrees. Alpha is
measured counterclockwise from the positive x axis of the current
coordinate system, beta is measured clockwise from the positive y axis.
Both angles must be in the range -360° < alpha, beta < 360°, and must
be different from -270°, -90°, 90°, and
270°
Given the following points that bound the parallelogram:
TL Top Left
TR Top Right
BR Bottom Right
BL Bottom Left
Any help would be appreciated.
Cheers
Dave
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