From f8515f468330ad3f924e10b086da2e0147e29016 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Crozet?= <developer@crozet.re>
Date: Sat, 29 Jun 2013 18:59:04 +0000
Subject: [PATCH] Add rotation wrt center of a matrix.

---
 src/traits/rotation.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/traits/rotation.rs b/src/traits/rotation.rs
index c4a7c69a..1aa548e7 100644
--- a/src/traits/rotation.rs
+++ b/src/traits/rotation.rs
@@ -48,3 +48,17 @@ pub fn rotate_wrt_point<M: Translatable<LV, M2>,
 
   res
 }
+
+/**
+ * Applies a rotation centered on the input translation.
+ *
+ *   - `m`:       the object to be rotated.
+ *   - `ammount`: the rotation to apply.
+ */
+#[inline]
+pub fn rotate_wrt_center<M: Translatable<LV, M2> + Translation<LV>,
+                         M2: Rotation<AV> + Translation<LV>,
+                         LV: Neg<LV>,
+                         AV>
+       (m: &M, ammount: &AV) -> M2
+{ rotate_wrt_point(m, ammount, &m.translation()) }