[cairo] Path Gradients

Bobby Salazar bobby8934 at inbox.com
Wed Jan 16 12:41:56 PST 2008

So, would anyone with a graphics and/or cairo background care to try implementing this?

> -----Original Message-----
> From: bobby8934 at inbox.com
> Sent: Tue, 8 Jan 2008 09:42:05 -0800
> To: cairo at cairographics.org
> Subject: Re: [cairo] Path Gradients
>> I would say that path gradients are still useless unless the path is
>> very close to a circle. HOWEVER: the current Cairo radial gradient
>> requires the path to be an ellipse, so this has a bit more power as
>> those rounded rectangles are possible. Also they are trying to allow the
>> same path object to be reused in useful ways to define both the pattern
>> and the fill shape, although this seems to be leading to a bunch of
>> extra fiddly controls such as the "bounding box", but still may be a
>> good idea. I think otherwise there may have to be path transform
>> operations added to Cairo.
> I agree - path gradients with only a single center point are most useful
> for just near circular paths. However, I still think this is worthwhile
> to implement, and near circular paths would be IMHO the most commonly
> used.
>> A gradient drawn between two paths could be much more useful as it could
>> be used to produce the blobby effects on non-square shapes.
> Yes, and this would be the more complex type of path gradients to
> support. If we started with a "simple" path gradient type that only
> accepted a single center point, we could later add the "complex" path
> gradient that took two paths. Perhaps at that time we could map the
> "simple" path gradient to the "complex" path gradient by supplying a path
> that has a single move_to() operation in it?
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