How to draw the area chart by using canvas ?
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!http://image.free.in.th/z/ty/jtq5m.png(area chart)!
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Canvas implements the html5 canvas API. In other words you can google up "how to draw area charts in html5" and use those guides almost without modification.
Try for instance this page:
http://developer.apple.com/library/safari/#documentation/AudioVideo/Conceptual/HTML-canvas-guide/CreatingChartsandGraphs/CreatingChartsandGraphs.html