intersection between 4points(2lines)

Hi,

I want to calculate an intersection between 2 lines. those two lines are drawn between 4 points.

I now how to make the y=ax+b expression but the problem is that there is always an intersection between to lines if they don't have the same slope(a).

So i need to find a formula which returns a bool when the intersection is between the 4 points and not over whole the line.

Grtz

Annihil8

[424 byte] By [Annihil8] at [2007-12-24]