Re: [pygame] Questions about surface with alpha channel

[Lenard Lindstrom <len-l@xxxxxxxxx>]

With pygame.surfarray

pygame.surfarray.pixels_alpha(surface)[...] = 0

Of course one needs Numeric.


René Dudfield wrote:
> I can't think of a way to set the alpha by itself, without setting the 
> RGB.
>
> Say I wanted to set the alpha ONLY with fill() then I don't think I 
> can do it.
>
> Is there some way you could do that by passing mask to a blit call?
>
> If there's no way to do it already, then perhaps we could create a
> separate function which only acts on one channel at once.  eg, only R,
> or only A.  This could be added as a 'special flag' the same way the
> BLEND_ADD etc have recently been added to Surface.fill()
>
> Or maybe I'm forgetting some way?
>
>
> On 6/21/07, John Eriksson <john@xxxxxxxxxxxx> wrote:
> > Hi,
> > I have a couple of questions regarding surfaces with an alpha channel.
> >
> > 1. Is this the correct way of creating an surface with an
> > alhpa-per-pixel channel?
> > surface = pygame.Surface((w, h), pygame.SRCALPHA)
> >
> > 2. How do you clear an alpha channel surface? I guesss you can't use the
> > fill method?
> >
> > Best Regards
> > /John


--
Lenard Lindstrom
<len-l@xxxxxxxxx>