On Fri, Mar 12, 1999 at 05:48:21PM +0800, James Henstridge wrote:
> People were wondering about if I could add an affine transformation helper
> module to gnome-python so I have. I have included it at the end of the
> message for people who are interested (if it looks like there are some
> bugs in it, please send in the reports)
Cool. I would add a shear which has the general matrix form
| 1 g |
| |
| h 1 |
h=0, g nonzero gives a pure shear in the y direction
g=0, h nonzero gives a pure shear in the x direction
def shear(g=0, h=0):
return (1, g, h, 1, 0, 0)
Here's a nice paper with examples of the basic 2-d transformations:
http://cs.fit.edu/~wds/classes/cse5255/thesis/index/index.html
Dave
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