From 0211ed5b3763379f65805581d5f4acfb1a87fd6c Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Thu, 2 Apr 2015 14:58:02 +1100
Subject: [PATCH] matrix: add 2d translate convenience function

---
 matrix.cpp | 9 +++++++++
 matrix.hpp | 1 +
 2 files changed, 10 insertions(+)

diff --git a/matrix.cpp b/matrix.cpp
index 96c6c5e0..1801e0b7 100644
--- a/matrix.cpp
+++ b/matrix.cpp
@@ -439,6 +439,15 @@ matrix<T>::look_at (util::point<3,T> eye,
 }
 
 
+//-----------------------------------------------------------------------------
+template <typename T>
+matrix<T>
+matrix<T>::translate (util::vector<2,T> v)
+{
+    return translate ({v.x, v.y, 0});
+}
+
+
 //-----------------------------------------------------------------------------
 template <typename T>
 matrix<T>
diff --git a/matrix.hpp b/matrix.hpp
index 3d0ace2b..629d0e6c 100644
--- a/matrix.hpp
+++ b/matrix.hpp
@@ -67,6 +67,7 @@ namespace util {
         static matrix<T> look_at (point<3,T> eye, point<3,T> centre, vector<3,T> up);
 
         // Affine matrices
+        static matrix<T> translate (util::vector<2,T>);
         static matrix<T> translate (util::vector<3,T>);
         static matrix<T> scale     (util::vector<3,T>);
         static matrix<T> scale     (T);