From 3ee98f3bac24fd1c70a9de3e0fbe774e762c25b3 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Fri, 26 Jun 2009 15:31:34 +0000
Subject: Add lots of comments, and some code fixes discovered in the process.

---
 libdimensionxx/dimensionxx/geometry.hpp | 55 +++++++++++++++++++++++++++++++--
 1 file changed, 53 insertions(+), 2 deletions(-)

(limited to 'libdimensionxx/dimensionxx/geometry.hpp')

diff --git a/libdimensionxx/dimensionxx/geometry.hpp b/libdimensionxx/dimensionxx/geometry.hpp
index f623eda..606f83a 100644
--- a/libdimensionxx/dimensionxx/geometry.hpp
+++ b/libdimensionxx/dimensionxx/geometry.hpp
@@ -18,15 +18,17 @@
  * <http://www.gnu.org/licenses/>.                                       *
  *************************************************************************/
 
+// Wrappers for geometric types (Vectors, Matricies, Lines (rays)).
+
 #ifndef DIMENSIONXX_GEOMETRY_HPP
 #define DIMENSIONXX_GEOMETRY_HPP
 
-// Wrappers for geometric types (Vectors, Matricies, Lines (rays)).
-
 #include <dimension.h>
 
 namespace Dimension
 {
+  class Vector;
+
   // Wrapper for dmnsn_matrix
   class Matrix
   {
@@ -56,6 +58,12 @@ namespace Dimension
     // Get the wrapped matrix
     dmnsn_matrix dmnsn() const { return m_matrix; }
 
+    // Special constructors
+    static inline Matrix identity();
+    static inline Matrix scale(const Vector& factor);
+    static inline Matrix translation(const Vector& d);
+    static inline Matrix rotation(const Vector& theta);
+
   private:
     dmnsn_matrix m_matrix;
   };
@@ -126,6 +134,49 @@ namespace Dimension
     dmnsn_line m_line;
   };
 
+  // Matrix operators
+
+  inline Matrix
+  operator*(const Matrix& lhs, const Matrix& rhs)
+  {
+    // This order is important!
+    Matrix r = rhs;
+    r *= lhs;
+    return r;
+  }
+
+  inline Matrix
+  inverse(const Matrix& M)
+  {
+    return Matrix(dmnsn_matrix_inverse(M.dmnsn()));
+  }
+
+  // Special Matrix constructors
+
+  inline Matrix
+  Matrix::identity()
+  {
+    return Matrix(dmnsn_identity_matrix());
+  }
+
+  inline Matrix
+  Matrix::scale(const Vector& factor)
+  {
+    return Matrix(dmnsn_scale_matrix(factor.dmnsn()));
+  }
+
+  inline Matrix
+  Matrix::translation(const Vector& d)
+  {
+    return Matrix(dmnsn_translation_matrix(d.dmnsn()));
+  }
+
+  inline Matrix
+  Matrix::rotation(const Vector& theta)
+  {
+    return Matrix(dmnsn_rotation_matrix(theta.dmnsn()));
+  }
+
   // Vector operators
 
   inline Vector
-- 
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