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KonvaJS中怎么随鼠标画线连接两个图形

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KonvaJS中怎么随鼠标画线连接两个图形

如题，想实现的效果就是这样：
test2.gif

我知道怎么用原生canvas实现，但是转到KonvaJS中就懵掉了...不清楚它的刷新原理，用了一个数组存鼠标移动时的零时线，但怎么画都出不来线，不知道哪错了/(ㄒoㄒ)/~~

救救孩子吧，谢谢大佬们！


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