I'm stuck on this one. I thought I had looked at an example where
this was possible but I either can't find it or I'm imagining it.
Here is what I'm trying to do:
I have a canvas that I set the backdrop to a picture.
I create a picture with transparent set that is the same size as the
canvas.
Then I draw the picture into the canvas.
This works and I can draw in the picture which I re-draw to the
canvas and the backdrop picture shows through.
But when I try to "erase" in the picture it does nothing. Everything
I have tried has no effect. If transparent is set I can not set the
pixels to white so I can't get the effect of erasing and leaving the
backdrop image untouched.
Is it possible to do this? Any pointers?
Thanks,
Peter
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