Function intersect

intersect(x1, y1, x2, y2, x3, y3, x4, y4, finiteLine?): false | Point
This will find the intersection point of two lines or false if they don't intersect. This optionally takes a finiteLine flag. If this is set to false then two line segments that would virtual intersect if extended to infinity will also return a point.
Parameters
- x1: number
- y1: number
- x2: number
- y2: number
- x3: number
- y3: number
- x4: number
- y4: number
- finiteLine: boolean = true
Returns false | Point
Credit
by Paul Bourke http://paulbourke.net/geometry/pointlineplane/