[plt-scheme] Loading transparent png

From: Paulo J. Matos (pocmatos at gmail.com)
Date: Fri Jun 9 14:12:48 EDT 2006

Hi all,

I'm loading a transparent PNG to a canvas with:
(instantiate canvas% ()
                         (parent hpane-top)
                         (style '(transparent))
                         (paint-callback (lambda (canvas dc)
                                           (send dc draw-bitmap
cross-bitmap 0 0)))))

However, the PNG is not showing up as transparent but with a white
background, or probably it's shown as transparent but canvas is
'drawing' a white background which I can't seem to remove.

What's the best way to do this?


Paulo Jorge Matos - pocm at sat inesc-id pt
Web: http://sat.inesc-id.pt/~pocm
Computer and Software Engineering

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