[cairo] Path Gradients
spitzak at thefoundry.co.uk
Fri Jan 4 13:33:46 PST 2008
Behdad Esfahbod wrote:
> Ah sorry, I totally missed that one on first reading. Seems like
> there's SurroundColors that does conical, and InterpolationColors that
> does radial. I wouldn't be surprised if it's one or the other.
> The ref docs don't talk about it either:
Well that page certainly maximizes the content/information ratio! All I
learned is that there is also a "focus point" as well as a "center
> No idea what you mean here. I assume you are referring to the square
> here for example?
> What is so hard about it? Sorry for keep asking stupid questions BTW.
I was referring to the much more rectangular display at the top of the
calculator picture. That rectangle is about 5 times wider than it is
tall. If the path gradient worked like it sounds, the rounded edge
should be 5 times thicker on the left/right than on the top/bottom.
Instead it appears about 2 times thicker.
What I am afraid they did was fill three shapes, using the path gradient
for a 1/2 wide rectangle on the left + right, and a linear gradient for
the middle. The fact that there is no seam requires exact bug-for-bug
duplication of whatever math they are doing to produce the same result
in both the linear and path gradients.
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