Add coordinates access to translations.

Fix #509.

src/geometry/mod.rs

@@ -37,6 +37,7 @@ mod translation_alga;
 mod translation_alias;
 mod translation_construction;
 mod translation_conversion;
+mod translation_coordinates;
 mod translation_ops;
 
 mod isometry;

src/geometry/translation_coordinates.rs

@@ -0,0 +1,44 @@
+use std::mem;
+use std::ops::{Deref, DerefMut};
+
+use base::allocator::Allocator;
+use base::coordinates::{X, XY, XYZ, XYZW, XYZWA, XYZWAB};
+use base::dimension::{U1, U2, U3, U4, U5, U6};
+use base::{DefaultAllocator, Scalar};
+
+use geometry::Translation;
+
+/*
+ *
+ * Give coordinates to Translation{1 .. 6}
+ *
+ */
+
+macro_rules! deref_impl(
+    ($D: ty, $Target: ident $(, $comps: ident)*) => {
+        impl<N: Scalar> Deref for Translation<N, $D>
+            where DefaultAllocator: Allocator<N, $D> {
+            type Target = $Target<N>;
+
+            #[inline]
+            fn deref(&self) -> &Self::Target {
+                unsafe { mem::transmute(self) }
+            }
+        }
+
+        impl<N: Scalar> DerefMut for Translation<N, $D>
+            where DefaultAllocator: Allocator<N, $D> {
+            #[inline]
+            fn deref_mut(&mut self) -> &mut Self::Target {
+                unsafe { mem::transmute(self) }
+            }
+        }
+    }
+);
+
+deref_impl!(U1, X, x);
+deref_impl!(U2, XY, x, y);
+deref_impl!(U3, XYZ, x, y, z);
+deref_impl!(U4, XYZW, x, y, z, w);
+deref_impl!(U5, XYZWA, x, y, z, w, a);
+deref_impl!(U6, XYZWAB, x, y, z, w, a, b);