Re: Help with understanding matrices
Re: Help with understanding matrices
- Subject: Re: Help with understanding matrices
- From: "Mark J. Reed" <email@hidden>
- Date: Thu, 14 Feb 2008 15:37:59 -0500
On Thu, Feb 14, 2008 at 2:13 PM, Simon Topliss <email@hidden> wrote:
> mvalue_a = x scale
> mvalue_b = y skew
> mvalue_c = x skew
> mvalue_d = y scale
> mvalue_tx = x translation (position)
> mvalue_ty = y translation (position)
Ok, you're mixing up interpretations here. The first four values in
the matrix represent a combination of scaling with *either* skew or
rotation. You can consider either the skew or the rotation as the
primary value and the other one is the result of combining it with the
scale. But it doesn't make sense to try and extract both rotation and
skew from a matrix... you'll get two values that depend on each other.
--
Mark J. Reed <email@hidden>
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