I am drawing a puzzle in an HTML5 Canvas.
The full code is here: https://github.com/Integralist/HTML5-Image-Slider-Game
There is always one empty place, and when the user clicks on a piece of the puzzle, I move it to an empty place.
But when I do this, the puzzle displays a shadow, see image below.
Any idea why this will happen? Is it because I'm painting on top of content already on the canvas? This is a workaround to clear the canvas before drawing, and if so, is there a way to do this without having to redraw all the other pieces of the puzzle, since I'm not sure how best to do it.
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