diff --git a/src/raymath.h b/src/raymath.h index 7f05ea4e..4ab5468a 100644 --- a/src/raymath.h +++ b/src/raymath.h @@ -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 //----------------------------------------------------------------------------------