Using WPF I\'m drawing symbols in the \"fast way\" (Drawing rendered on DrawingVisuals, no Shapes). So... I can successfully draw them and get hit-tested with no problem.
I am having problem here with bitmaps..I want to remove the black background th开发者_如何学JAVAat my bitmap is having.
I made a paint app in Tkinter. I would like to know how to implement a function that deletes the previous action in every drawing. I made it work, however, it only deletes the very last draw but not t
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