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Animating the Canvas Animation is achieved with the following: 1.Clear the area that is changing context.clearRect(x, y, width, height); 2.Save the canvas. - ppt download
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JS初心者がCanvasを使っていたらぶち当たった壁 - Qiita
clearRect() method in HTML5 Canvas - wikitechy
clearRect() method in HTML5 Canvas - wikitechy
