Re: [pygame] Gradient Algorithm

[Brain Murphy <brianomorchoe@xxxxxxxxxxx>]

Thats cool I thought it was not possible.

Thank you I will try to use this.

Brian

Kris Schnee <kschnee@xxxxxxxxxx> wrote:

> Here is some code I built for my interface system (Driftwood), 
> specifically for filling a rectangular area with a vertical gradient. 
> That is, it starts with one color at the top and smoothly blends to a 
> second color at the bottom. You can use this code if you want.
>
> Kris
>
> Code follows, where "self.image" is a surface and "drawing_area" is a 
> Rect showing the area to fill. "self.background_color" and "_gradient" 
> are two color tuples, eg. (0,255,255) for cyan.
>
> x1 = self.drawing_area[0]
> x2 = x1 + self.drawing_area[2]
> a, b = self.background_color, self.background_gradient
> y1 = self.drawing_area[1]
> y2 = y1 + self.drawing_area[3]
> h = y2-y1
> rate
>  = (float((b[0]-a[0])/h),
> (float(b[1]-a[1])/h),
> (float(b[2]-a[2])/h)
> )
> for line in range(y1,y2):
> color = (min(max(a[0]+(rate[0]*line),0),255),
> min(max(a[1]+(rate[1]*line),0),255),
> min(max(a[2]+(rate[2]*line),0),255)
> )
> pygame.draw.line(self.image,color,(x1,line),(x2,line))

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