Added centers of bounding box

src/math/bounding_box.rs

@@ -94,6 +94,7 @@ macro_rules! make_bounding_box {
                 }
                 ret
             }
+
         }
 
     }
@@ -103,6 +104,21 @@ make_bounding_box!(BoundingBox2, Vector2, 2);
 make_bounding_box!(BoundingBox3, Vector3, 3);
 make_bounding_box!(BoundingBox4, Vector4, 4);
 
+macro_rules! impl_center {
+    ($name: ident, $vector: ident, $f: tt) => {
+        impl $name<$f> {
+            /// Returns the center of the bounding box.
+            pub fn center(&self) -> $vector<$f> {
+                (self.min + self.max) / 2.0
+            }
+        }
+    }
+}
+
+impl_center!(BoundingBox2, Vector2, f32);
+impl_center!(BoundingBox2, Vector2, f64);
+
+
 #[cfg(test)]
 mod tests {