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"Line Intersection"
, by ashcroftman
returns true if two lines 'touch'
Uses maths, not 'per-pixel' so is pretty fast...
Code
Function lineIntersect(x1#,y1#,x2#,y2#,u1#,v1#,u2#,v2#) b1# = (y2 - y1) / (x2 - x1) b2# = (v2 - v1) / (u2 - u1) a1# = y1 - b1 *x1 a2# = v1 - b2 *u1 xi# = - (a1-a2)/(b1-b2) yi# = a1+b1*xi If (x1 - xi)*(xi-x2)> -1 And (u1-xi)*(xi - u2)> 0 And (y1-yi)*(yi-y2)>-1 And (v1-yi)*(yi-v2)>-1 Return TrueEnd Function
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