From: wolf <wolf@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Wed, 27 Sep 2000 14:42:35 +0000 (+0000)
Subject: CellData::rotate.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b96ece8a372c3a470bb31c4ad748cd35d1c82f16;p=dealii-svn.git

CellData::rotate.


git-svn-id: https://svn.dealii.org/trunk@3349 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/deal.II/include/grid/tria.h b/deal.II/deal.II/include/grid/tria.h
index 583e716a52..009ff436c3 100644
--- a/deal.II/deal.II/include/grid/tria.h
+++ b/deal.II/deal.II/include/grid/tria.h
@@ -35,9 +35,10 @@ template <int dim> class MGDoFHandler;
 
 
 /**
- *  Structure which is passed to the @ref{Triangulation}@p{<dim>::create_triangulation}
- *  function. It contains all data needed to construct a cell, namely the
- *  indices of the vertices and the material indicator.
+ *  Structure which is passed to the
+ *  @ref{Triangulation}@p{<dim>::create_triangulation} function. It
+ *  contains all data needed to construct a cell, namely the indices
+ *  of the vertices and the material indicator.
  */
 template <int dim>
 struct CellData
@@ -48,6 +49,33 @@ struct CellData
     int           vertices[1 << dim];
 #endif
     unsigned char material_id;
+
+				     /**
+				      * Rotate the cell as many times
+				      * as is given by the
+				      * argument. Rotation is done by
+				      * rotating the vertices. Note
+				      * that rotation is not possible
+				      * in 1d, and that there are four
+				      * possible orientations of a
+				      * cell in 2d, which are numbered
+				      * counter-clockwise. The
+				      * function is presently not
+				      * implemented for 3d.
+				      */
+    void rotate (const unsigned int times);
+
+				     /**
+				      * Rotations are not possible in 1d.
+				      */
+    DeclException0 (ExcNotPossible);
+				     /**
+				      * Exception
+				      */
+    DeclException1 (ExcInvalidRotation,
+		    int,
+		    << "The requested number of rotations, " << arg1
+		    << " is not possible in the present space dimension.");
 };
 
 
diff --git a/deal.II/deal.II/source/grid/tria.all_dimensions.cc b/deal.II/deal.II/source/grid/tria.all_dimensions.cc
index c7cbe07d1b..4b8cc045b2 100644
--- a/deal.II/deal.II/source/grid/tria.all_dimensions.cc
+++ b/deal.II/deal.II/source/grid/tria.all_dimensions.cc
@@ -31,6 +31,40 @@
  */
 
 
+template <>
+void CellData<1>::rotate (unsigned int)
+{
+  Assert (false, ExcNotPossible());
+};
+
+
+
+template <>
+void CellData<2>::rotate (unsigned int times)
+{
+  while (times != 0)
+    {
+      const unsigned int x = vertices[0];
+      vertices[0] = vertices[1];
+      vertices[1] = vertices[2];
+      vertices[2] = vertices[3];
+      vertices[3] = x;
+
+      --times;
+    };
+};
+
+
+
+template <>
+void CellData<3>::rotate (unsigned int)
+{
+  Assert (false, ExcNotImplemented());
+};
+
+
+
+
 bool SubCellData::check_consistency (const unsigned int dim) const
 {
   switch (dim)