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List:       koffice-devel
Subject:    Re: Extending KoShape with QPainter hints
From:       Boudewijn Rempt <boud () valdyas ! org>
Date:       2006-10-06 12:14:16
Message-ID: 200610061414.18368.boud () valdyas ! org
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On Thursday 05 October 2006 12:06, Thomas Zander wrote:
> On Wednesday 04 October 2006 08:46, Boudewijn Rempt wrote:
> > QPainter offers cool things like transparency and composition mode. We
> > can leave it to the shapes to implement these, or make it a general
> > property of KoShape and use these properties in KoShapeManager::paint()
> > -- would that be an agreeable idea?
>
> Ok,
>
> what about;
>
> KoShape
>   virtual double masterTransparancy() { return 0.0; }
>   virtual void setMasterTransparancy() { /* alter the alpha of the
> background color*/}
>
> Shapes that don't use the background color can then override these methods
> and do their own thing. For example by storing a double with the opacity.
> Shapes that have more colors can override this method and alter the opacity
> of all of them, for example.
>
> This has the effect that we no longer force onto the user the concept of an
> alpha per color (which boud pointed out doesn't make a lot of sense) and
> thus we won't end up with having 2 places to alter the alpha channel for
> most objects.

Yes, that's more or less what I would like a lot.

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi

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