COMMON: Add function to find the intersecting rectangle

scummvm · Sep 17, 2011 · 3b9ab4f · 3b9ab4f
1 parent da74436
commit 3b9ab4f
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/common/rect.h b/common/rect.h
@@ -169,6 +169,20 @@ struct Rect {
 		return (left < r.right) && (r.left < right) && (top < r.bottom) && (r.top < bottom);
 	}
 
+	/**
+	 * Find the intersecting rectangle between this rectangle and the given rectangle
+	 *
+	 * @param r the intersecting rectangle
+	 *
+	 * @return the intersection of the rectangles or an empty rectangle if not intersecting
+	 */
+	Rect findIntersectingRect(const Rect &r) const {
+		if (!intersects(r))
+			return Rect();
+
+		return Rect(MAX(r.left, left), MAX(r.top, top), MIN(r.right, right), MIN(r.bottom, bottom));
+	}
+
 	/**
 	 * Extend this rectangle so that it contains r
 	 *