newlispfanclub.alh.net

Posted: **Mon Sep 24, 2007 7:42 am**

Hi Lutz,

what does gs:shear-tag actualy do?

Norman.

Posted: **Mon Sep 24, 2007 11:49 am**

shear is an affine transform which shifts all x and y coordinates of a shape by a certain factor shx and shy. This is the 2D transformation matrix:

 [   1   shx ]
 [  shy   1  ]

Lines are kept streight and parallel by this transformation.

See also here: http://en.wikipedia.org/wiki/Affine_transformation

and here: http://en.wikipedia.org/wiki/Shear_%28mathematics%29

Lutz

Posted: **Tue Sep 25, 2007 5:54 am**

thanks ;-)