ADDED: CheckCollisionLines()

Removed function from raymath

1 files changed, 24 insertions, 0 deletions

diff --git a/src/shapes.c b/src/shapes.c
index f5447241..fad55e24 100644
--- a/src/shapes.c
+++ b/src/shapes.c
@@ -1471,6 +1471,30 @@ bool CheckCollisionCircleRec(Vector2 center, float radius, Rectangle rec)
     return (cornerDistanceSq <= (radius*radius));
 }
 
+// Check the collision between two lines defined by two points each, returns collision point by reference
+bool CheckCollisionLines(Vector2 startPos1, Vector2 endPos1, Vector2 startPos2, Vector2 endPos2, Vector2 *collisionPoint)
+{
+    const float div = (endPos2.y - startPos2.y)*(endPos1.x - startPos1.x) - (endPos2.x - startPos2.x)*(endPos1.y - startPos1.y);
+
+    if (div == 0.0f) return false;      // WARNING: This check could not work due to float precission rounding issues...
+
+    const float xi = ((startPos2.x - startPos2.x)*(startPos1.x*endPos1.y - startPos1.y*endPos1.x) - (startPos1.x - endPos1.x)*(startPos2.x*endPos2.y - startPos2.y*endPos2.x))/div;
+    const float yi = ((startPos2.y - endPos2.y)*(startPos1.x*endPos1.y - startPos1.y*endPos1.x) - (startPos1.y - endPos1.y)*(startPos2.x*endPos2.y - startPos2.y*endPos2.x))/div;
+
+    if (xi < fminf(startPos1.x, endPos1.x) || xi > fmaxf(startPos1.x, endPos1.x)) return false;
+    if (xi < fminf(startPos2.x, endPos2.x) || xi > fmaxf(startPos2.x, endPos2.x)) return false;
+    if (yi < fminf(startPos1.y, endPos1.y) || yi > fmaxf(startPos1.y, endPos1.y)) return false;
+    if (yi < fminf(startPos2.y, endPos2.y) || yi > fmaxf(startPos2.y, endPos2.y)) return false;
+    
+    if (collisionPoint != NULL)
+    {
+        collisionPoint->x = xi;
+        collisionPoint->y = yi;
+    }
+    
+    return true;
+}
+
 // Get collision rectangle for two rectangles collision
 Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2)
 {