Re: [pygame] Passing pionts through a matrix.

[Rene Dudfield <illumen@yahoo.com>]

campbell barton wrote:

> Hi, I am thinking about making a program where you can pass a list of points (x,y) through a rotation/scale/distortion matrix.
> This could be done through python but I was wondering if numeric would be better?
>
> It would be a polyline - Not a image.
> - Cam
>  
In numeric is another module called Matrix.

import Matrix

They are pretty much the same as opengl matrices.  Below is how to make 
a translation matrix.  Just make your points z be 0.

def create_translation_matrix(position):
   """ returns a translation matrix from the position given(x,y,z).
   """
   x,y,z = position
   return Matrix.Matrix( [[  1.,      0.,      0.,     0.,],
                          [  0.,      1.,      0.,     0.,],
                          [  0.,      0.,      1.,     0.,],
                          [  x,       y,       z,      1.,] ] )



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