listener的y问题#1
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一次draw只需要回调一次接口就可以了，不需要放在for循环里，放在for循环中其实最终传入的是最右边点的y（顶部到path的距离），直接计算中间点的y坐标，再用view的高度减去它，就得到距离底部的距离了