Rectangle distance

Will be usefull for my UI nav

Source/Engine/Core/Math/Rectangle.cs

@@ -284,6 +284,17 @@ namespace FlaxEngine
             Vector2 toExpand = Size * (scale - 1.0f) * 0.5f;
             return new Rectangle(Location - toExpand * 0.5f, Size + toExpand);
         }
+        
+        /// <summary>
+        /// Computed nearest distance between 2 rectangles.
+        /// </summary>
+        /// <param name="w">Firat rectangle</param>
+        /// <param name="b">Second rectangle</param>
+        /// <returns>Resulting distance, 0 if overlapping</returns>
+        public static float Distance(Rectangle a, Rectangle b)
+        {
+             return Vector2.Max(Vector2.Zero, Vector2.Abs(a.Center - b.Center) - (a.Size * 0.5f - b.Size * 0.5f)).Length;
+        }
 
         /// <summary>
         /// Calculates a rectangle that includes the margins (inside).