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非零环绕数规则 #28
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非零环绕数规则 #28
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感谢指正 |
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特别是你的这幅图的p3射线，让人困惑 |
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我的理解是，左右只是相对这条射线的两边而言的吧，你指定线的一边是左，那另一半就是右了 |
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横着切割,平分那个矩形的话,左右要怎么分呢 |
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如果指定射线上边为左，下边为右，矩形竖着的那两条边方向肯定是相反的，一个向上一个向下，所以肯定是一个从左到右，一个从右到左，环绕数加起来应该是0，所以在外部 |
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将图片旋转一下，让射线竖起来左右就清晰了，例如这样: |
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还是旋转图片，清晰明了，多谢指点啦 |
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大神,网上说的,顺逆时针的方法,是不是不适用于这个,还是有特殊的限制 |
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不知道你说的顺逆时针是指什么，我知道顺逆时针在 3D 绘图中用来判断正反面。 |
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知道了,百度错东西了,谢谢了 |
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受益匪浅。 发现一个小笔误，反馈一下： 0在外，非零在内