Re: XOR drawing on Tk canvas?
From: Donald Arseneau (asnd_at_triumf.ca)
Date: 01/28/04
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Date: 27 Jan 2004 15:08:48 -0800
Jeff Hobbs <jeffh@activestate.com> writes:
> Jason Harper wrote:
> > What I REALLY want is a "color blend" drawing mode, so I could subtly
> > tint the desired squares. But it's hard to imagine a toolkit that has
> > that, but not the more basic XOR mode.
>
> Aha! That, Tk has, as of 8.4.5 (most recent stable) in a limited
> fashion. It supports transparency in images, so you could have
> semi-transparent PNG images (use the Img extension to get the
> extra image formats).
To clarify: you do not need separate images for every map square;
just an image of a plain colored square, with a transparency level.
Place this image (repeatedly) over the parts of the map needing
highlighing.
Donald Arseneau asnd@triumf.ca
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