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LineIntersect
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MATLAB
[Int Px Py Len Para] = LineIntersect(P1x,P1y,P2x,P2y);
Description

Determines if and where 2D polylines intersect.

Parameters
Parameters 
Description 
P1x [vector] 
x axis locations of first polyline 
P1y [vector] 
y axis locations of first polyline 
P2x [vector] 
x axis locations of second polyline 
P2y [vector] 
y axis locations of second polyline 
Return Values
Return Values 
Description 
Int [P1xP2 logical array] 
Intersections tag per polyline segment 
Px [P1xP2 array] 
X axis intersect points 
Py [P1xP2 array] 
Y axis intersect points 
Len [P1xP2 array] 
Length to intersect 
Para [P1xP2 array] 
Parallel tag per polyline segment 
References

D. Kirk, Graphic Gems III, pg.188-192. Ap Professional, 1992.

Examples

  • P1x = [8,3,6,1,6,3,3];
  • P1y = [2,2,4,7,7,10,7];
  • P2x = [5,0,2,6,3];
  • P2y = [2,5,5,6,7];
  • IntX = [5,3.947,3.647,3]; % Expected X-axis intersects
  • IntY = [2,2.632,5.412,7]; % Expected Y-axis intersects
  • [Int Px Py Len Para] = LineIntersect(P1x,P1y,P2x,P2y)

Group

General Utility Functions

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