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[Math Feature]: Add two functions for Vector2 to know if two lines intersect and two segments intersect (#1466)

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* Add a function to know if two lines intersect each other and if yes, get the intersection point

* Remove indents

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

* Remove bad indents

* Fix compilation issues

* Fix compilation error

* Fix compilation error

* Replace keyword '_Bool' by 'bool'
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Victor Gallet 2020-12-21 21:04:02 +01:00 • committed by GitHub
parent 51e75be9d1
commit 668b3e4cfb
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src/raymath.h
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@ -336,6 +336,45 @@ 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), return true if it exists, else false
RMDEF bool Vector2LineIntersect(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 coeff = ((p4.x - p3.x)*(p1.y - p3.y) - (p4.y - p3.y)*(p1.x - p3.x)) / div;
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(p1.x, p2.x) || xi > fmaxf(p1.x, p2.x)) return false;
if (xi < fminf(p3.x, p4.x) || xi > fmaxf(p3.x, p4.x)) return false;
if (yi < fminf(p1.y, p2.y) || yi > fmaxf(p1.y, p2.y)) return false;
if (yi < fminf(p3.y, p4.y) || yi > fmaxf(p3.y, p4.y)) return false;
if (pointIntersection)
{
pointIntersection->x = xi;
pointIntersection->y = yi;
}
return true;
}
//----------------------------------------------------------------------------------
// Module Functions Definition - Vector3 math
//----------------------------------------------------------------------------------