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多谢指点，不过请问你说的是这种情况么（见内）

Posted by xiaox at 2008-02-25 13:33:27
In Reply To:显然错了，你就只画一个不对称的凹多边形就知道了.. Posted by:richardxx at 2008-02-25 13:27:47 
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|  /\ |
| /  \|
|/    \

你说的是不是有条线段横跨上面的图形中凹进去的部分啊？
如果是的话，按我说的，求得交点之后会有两个交点的中点不在内部啊
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