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<kengruven> i'm drawing a 2d gradient in a canvas% by looping with (set-brush (compute-color x y) 'solid) and (draw-rectangle x y 1 1), and it looks good but it's awfully slow. is this the sort of thing that should be possible to do efficiently in racket?
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<winny> I haven't done much with a dc% in awhile, but i saw there's a way to create a brush with a special class https://docs.racket-lang.org/draw/linear-gradient_.html
<kengruven> yeah, but that's only a linear gradient, and only using the RGB color space.
<kengruven> i glanced at the source code, and it looks like there's special cases in the drawing code for the 2 built-in types of gradients. you can't just write a new gradient subclass.
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<williewillus> how do you define a contract for multiple return values?
<williewillus> brief search in the docs yields nothing
<williewillus> and don't want to trawl through all the dirty details
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<samph> williewillus: (-> number? (values any any))
<samph> er s/any/any\/c/
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<williewillus> thanks
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