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afbrushboard's Issues

对AFBrushBoard.swift, Line 105.中let len = Int(sqrt(pow(x1, 2) + pow(x2,2))*10)的疑问

你好,AFBrushBoard的Demo让我受益良多,然而能力有限,接触的东西不多,有一些地方我没有弄懂,希望能得到解答:

在AFBrushBoard.swift, Line 105.

let len = Int(sqrt(pow(x1, 2) + pow(x2,2))*10)
  1. 在网上略微看了三次贝塞尔曲线长度计算的一些资料,计算长度是需要积分的。此处的估算是直接_10处理。想请问一下此处为何是_10处理。
  2. 每次changeImage()打印len的值,发现在屏幕滑动很小一截,len都会上百。(虽然绘制过程中会省略多余的点)len的值的粒度定这么细是有特殊的意义么?

谢谢。

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