[cairo] Gradient Transformation Problems

[Me Myself]

> You can manually adjust the points, yes, like you did. But you also
> need to understand that the interpolation of the gradient colors is
> also affected by the transformation, and your "manual" case can't
> account for this.
> 
> Look at your two results and look at the angle of lines of uniform
> color in each gradient. In both cases these lines are normal to the
> line you used in cairo_pattern_create_linear, but the computation of
> "normal" is within user-space, so it is transformed differently in
> both cases.
> 
> Does that make sense?

Ok, yes that makes sense.

So given any arbitrary X and Y scaling, do you know a formula I could use on the gradient pattern points to make them maintain the proper results when I manually calculate the points?

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