Re: [pygame] some surfarray questions...

[Sami Hangaslammi <shang@cc.jyu.fi>]

Not the fastest way to use surfarray, but this is about twice as fast on 
my computer than the Python loop (and as a bonus, twice as obscure ;-)


import Numeric as N

class ColorSelector(Dialog_OK):
    # a bunch of other methods snipped...

    def set_color_square(self):

        image = self.color_square.image

        h = self.hue
        r, g, b = colorsys.hsv_to_rgb(h, 1, 1)

        x,y = N.indices((256,256), N.Float)
        y /= 256.0
        row_mul = 1-y

        y *= x
        x *= row_mul

        rgb = N.zeros((256,256,3), N.Float)
        rgb[...,0] = x * r + y
        rgb[...,1] = x * g + y 
        rgb[...,2] = x * b + y

        a = pygame.surfarray.pixels3d(image)
        a[...] = rgb.astype(N.UnsignedInt8)

        self.color_square.udraw()

    # etc, etc...



On Mon, 1 Sep 2003, Lee Harr wrote:

> Hi;
> 
> My ultimate goal here is to make a color selector box, kind of like you
> might see in the GIMP.  I have one that works, but it is pretty slow
> when you change which hue you want to use. (it basically goes through
> a surface and does set_at everywhere)
> 
<snip>
> 
> 
> This works, but on a fairly fast machine it takes about half a second
> to repaint the color square.
> 
> I have tried a few different approaches using surfarray, but every
> way I tried actually made it slower.  I am sure I am doing something
> wrong there, plus I am concerned that surfarray is a non-standard
> part of pygame and so I would have to make some way to fall back
> to a non-surfarray method anyhow.
> 
> So. Two questions:
> 
> - is surfarray still considered non-standard? Or does pretty much
>   everyone who has pygame have surfarray?
> 
> - do you see a faster way to do this?  :o)
> 
> Thanks for your time.
> 
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--
Sami Hangaslammi