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安卓自定义View进阶-Canvas之绘制图形部分有误 #116

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xxssd-awsl opened this issue Aug 2, 2022 · 0 comments

xxssd-awsl commented Aug 2, 2022

关于对drawRoundRect的这部分描述：

其中灰色部分是我们所选定的矩形，而里面的圆角矩形则变成了一个椭圆，实际上在rx为宽度的一半，ry为高度的一半时，刚好是一个椭圆，通过上面我们分析的原理推算一下就能得到，而当rx大于宽度的一半，ry大于高度的一半时，实际上是无法计算出圆弧的，所以drawRoundRect对大于该数值的参数进行了限制(修正)，凡是大于一半的参数均按照一半来处理。

我在使用的时候发现，大于一半的参数并不是按一半来处理的，是按等比缩放来处理的

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