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Rework the declaration of the 'Vector2LineIntersect' function, and add the 'Vector2SegmentIntersect' function

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Elkantor 2020-12-21 15:11:06 +01:00
parent 04a798bdf7
commit db9d393fdd
1 changed files with 31 additions and 7 deletions
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38
src/raymath.h
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@ -336,19 +336,43 @@ RMDEF Vector2 Vector2MoveTowards(Vector2 v, Vector2 target, float maxDistance)
return result;
}
// Get the intersection point of two lines A and B defined by A(p1, p2) and B(p3, p4)
RMDEF Vector2 Vector2LineIntersect(Vector2 p1, Vector2 p2, Vector2 p3, Vector2 p4)
// Get the intersection point of two lines A and B defined by A(p1, p2) and B(p3, p4), return true if it exists, else false
RMDEF _Bool Vector2 Vector2LineIntersect(Vector2 p1, Vector2 p2, Vector2 p3, Vector2 p4, Vector2* pointIntersection)
{
Vector2 result = { 0 };
const float div = (p4.y - p3.y)*(p2.x - p1.x) - (p4.x -p3.x)*(p2.y - p1.y);
if (div == 0.f) return result;
if (div == 0.f) return false;
const float coeff = ((p4.x - p3.x)*(p1.y - p3.y) - (p4.y - p3.y)*(p1.x - p3.x)) / div;
result.x = p1.x + (p2.x - p1.x) * coeff;
result.y = p1.y + (p2.y - p1.y) * coeff;
return result;
if (pointIntersection)
{
pointIntersection.x = p1.x + (p2.x - p1.x) * coeff;
pointIntersection.y = p1.y + (p2.y - p1.y) * coeff;
}
return true;
}
// Get the intersection point of two segments A and B defined by A(p1, p2) and B(P3, p4), return true if it exists, else false
RMDEF _Bool Vector2SegmentIntersect(Vector2 p1, Vector2 p2, Vector2 p3, Vector2 p4, Vector2* pointIntersection)
{
const float div = (p4.y - p3.y)*(p2.x - p1.x) - (p4.x -p3.x)*(p2.y - p1.y);
if (div == 0.f) return false;
const float xi = ((p3.x - p3.x)*(p1.x * p2.y - p1.y * p2.x) - (p1.x - p2.x)*(p3.x * p4.y - p3.y * p4.x)) / div;
const float yi = ((p3.y - p4.y)*(p1.x * p2.y - p1.y * p2.x) - (p1.y - p2.y)*(p3.x * p4.y - p3.y * p4.x)) / div;
if (xi < fminf(x1, x2) || xi > fmaxf(x1, x2)) return false;
if (xi < fminf(x3, x4) || xi > fmaxf(x3, x4)) return false;
if (yi < fminf(y1, y2) || yi > fmaxf(y1, y2)) return false;
if (yi < fminf(y3, y4) || yi > fmaxf(y3, y4)) return false;
if (pointIntersection)
{
pointIntersection->x = xi;
pointIntersection->y = yi;
}
return true;
}
//----------------------------------------------------------------------------------