Bounding polygon

I have a large number of intersected lines and I need to get the bounding polygon of the picked point. Can any one help me regarding that the algorithm should calculate the lines intersections? Any ideas or hints may be useful?
Thanks for all
Eng. M.Hsn

[This message has been edited by Mohamed Hassan (edited 11-01-2003).]

You could check for geometric algorithms and links to other sites that deal with line intersections.