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arthurprs

line segment colision

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I'm new to this kind of programming, someone can help me with colision between 2 line segments, and know where they intersect (they are determined by 2 points) Thanks.

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Here is a function that finds the intersection point between 2 line segments in 2D. The function will return FALSE if line segments do not intersect.

A, B = points on line 1
C, D = points on line 2
Q = intersection point

BOOL IntersectionLineSegments(vec *Q, vec A, vec B, vec C, vec D)
{
vec U = B - A;
vec V = D - C;
vec W = C - A;

float det = U.x*V.y-V.x*U.y;

if (det == 0)
return FALSE; // parallel, no intersection

float t = (W.x*U.y-U.x*W.y) / det;
float s = (W.x*V.y-V.x*W.y) / det;

if ((t < 0.0f || t > 1.0f) || (s < 0.0f || s > 1.0f))
return FALSE; // outside line segment

*Q = C + V*t; // intersection point

return TRUE; // line segments intersect
}

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