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147

How to add undo-functionality to HTML5 Canvas?

rated 0 times [ 152] [ 5] / answers: 1 / hits: 15963 / 14 Years ago, wed, june 23, 2010, 12:00:00

I have a Sketching app done in all HTML5 and Javascript, and I was wondering how I would create an Undo Button, so you could undo the last thing you drew. Any idea?

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nathalieg

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answered 14 Years ago pierceabnerc · Accepted Answer

You have to store all modifications in a datastructure. Then you can delete the latest modification if the user wants to undo it. Then you repaint all drawing operations from your datastructure again.