[Pythoncard-users] [newbie] drawing over a bitmap

[Mauro C. <mau...@ep...>]

Dear All,

sorry for the newbie question but I am fighting with the following =20
issue:
I am trying to add some drawing on top of an existing bitmap.
I tried two things: the first one was to draw directly on the image =20
setting that as the working canvas (i.e., canvas =3D =20
self.components.canvasBackground); the second was to draw on a =20
separate canvas.

The first attempt raised an exception because apparently is not =20
possible to draw on bitmaps. The second attempt load the drawing =20
canvas on top of the "background" bitmap and because it is not =20
transparent it covers automatically the background.

I tried to set the 'backgroundColor' to 'None' but without success =20
(it says that 'AttributeError: 'BitmapCanvas' object has no attribute =20=

'backgroundColour'').

Does anybody can help me to knock my head on the right place?
Thanks in advance for the pain you will generously cause


Mauro


_______________
Mauro Cherubini
Research Associate
Centre de Recherche et d'Appui pour la Formation et ses Technologies =20
(CRAFT) / Center for Research and Support of Training and its =20
Technologies

Ecole Polytechnique F=E9d=E9rale de Lausanne (EPFL) / Swiss Federal =20
Institute of Technology Lausanne
web: http://craft.epfl.ch -- blog: http://www.i-cherubini.it/mauro/blog/