Le Thursday 22 December 2011 00:17:07, Alex a écrit :
> First, the text "Hello World!" is drawn to the surface. Then, I alter the
> text and draw it again. But the old hello world text still remains on the
> surface. 
> I don't want that. I want "Hello World!" to disappear and Susan so show up.

You have to draw a black rectangle on $app before writing Susan. I don't think 
there's another way.


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