Starting to work

src/math/vector.rs

@@ -66,6 +66,11 @@ macro_rules! make_vector {
                 pub fn $x(&self) -> T {
                     self.data[$y]
                 }
+
+                /// Get a mut ref to the coordinate of the vector.
+                pub fn $x_mut(&mut self) -> &mut T {
+                    &mut self.data[$y]
+                }
              )*
         }