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You can also control when frames are drawn using noLoop and draw.
此外，还可以使用noLoop和draw 来控制在何时绘制画面。
youdao
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When you draw on one you can see what is drawn appear on the other.
当你在一个上绘制时你能看到你所绘制的东西出现在另一个上面。
youdao
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When you draw on one you can see what is drawn appear on the other.
当你在一个上绘制时你能看到你所绘制的东西出现在另一个上面。
youdao