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# 1. CanvasItem之draw和update
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![Image text](image/canvas1.png)
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![Image text](image/canvas2.png)
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![Image text](image/canvas3.png)
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![Image text](image/canvas4.png)
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![Image text](image/canvas5.png)
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![Image text](image/canvas6.png)
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![Image text](image/canvas7.png)
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