[求助]：已知两条相交直线怎么得到他们的交点

yhleagle

已知两条相交直线怎么得到他们的交点,setq point(.....) 各位大侠帮帮忙

锷未残

用 inters 函数来求交点

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(inters pt1 pt2 pt3 pt4 [onseg])

All points are expressed in terms of the current UCS. If all four point arguments are 3D, inters checks for 3D intersection. If any of the points are 2D, inters projects the lines onto the current construction plane and checks only for 2D intersection.

Arguments

pt1

One endpoint of the first line.

pt2

The other endpoint of the first line.

pt3

One endpoint of the second line.

pt4

The other endpoint of the second line.

onseg

If specified as nil, the lines defined by the four pt arguments are considered infinite in length. If the onseg argument is omitted or is not nil, the intersection point must lie on both lines or inters returns nil.

yhleagle

我用了，但是得出来的是我不能用于打断线啊

hi71400

交点打断？
以前这里有现成的代码。

maoding

用break可以吧

wkai

用这个吧：
http://www.xdcad.net/forum/showthread.php?s=&threadid=213437