javascript - Canvas overlapping elements -

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i have canvas animation redraws exact same element on (it long story why necessary) happens, , happens enough.

now assumed drawing element (using context path , stroke method) on existing exact replica of image should nothing @ animation. instead draws on past image , blurs sides (as if didn't draw @ same location.

the normal image without blurry sides

the image blurry sides

please let me know if there way fix this

thanks

this happening because canvas strokes anti-aliased. in practical sense you're drawing semi-opaque pixels on other semi-opaque pixels, , pixels overlaid opacities added together. don't think can (currently) force canvas object turn off anti-aliasing on strokes, may have live it. big of problem?

http://img813.imageshack.us/img813/303/canvasl.png

edit: guess try using pngs transparent backgrounds markers, instead of drawing them strokes. https://developer.mozilla.org/en/canvas_tutorial/using_images


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