放大缩小，zoom如何设置从中心点放大缩小 #1727
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wangdan-fit2cloud
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放大缩小，zoom如何设置从中心点放大缩小
#1727
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因为目前用.zoom()，画布上的整体组件会随着方法从左上角向下走，如果是用触摸屏或者鼠标滚轮 其实可以控制在中心点放大缩小，这个zoom要怎么设置呢
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