From 3dbbd5be1baa70fff6d2e22af58b21b655501320 Mon Sep 17 00:00:00 2001
From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Mon, 24 Mar 2014 03:14:05 +0000
Subject: [PATCH] Adjust implementation of laplace_transform to what had been
 documented.

git-svn-id: https://svn.dealii.org/trunk@32685 0785d39b-7218-0410-832d-ea1e28bc413d
---
 tests/deal.II/grid_transform_02.cc     |  89 ++++
 tests/deal.II/grid_transform_02.output | 653 +++++++++++++++++++++++++
 2 files changed, 742 insertions(+)
 create mode 100644 tests/deal.II/grid_transform_02.cc
 create mode 100644 tests/deal.II/grid_transform_02.output

diff --git a/tests/deal.II/grid_transform_02.cc b/tests/deal.II/grid_transform_02.cc
new file mode 100644
index 0000000000..9ceb05b33c
--- /dev/null
+++ b/tests/deal.II/grid_transform_02.cc
@@ -0,0 +1,89 @@
+// ---------------------------------------------------------------------
+// $Id$
+//
+// Copyright (C) 1998 - 2014 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE at
+// the top level of the deal.II distribution.
+//
+// ---------------------------------------------------------------------
+
+
+// Verify that GridTools::laplace_transform can deal with interior
+// nodes being pinned to a new location as well. The test itself
+// doesn't make much sense since it leads to a few inverted cells, but
+// it allows for easy visual inspection that the desired result
+// happens.
+//
+// (Testcase adapted from one by Denis Davydov.)
+
+
+#include "../tests.h"
+#include <deal.II/base/logstream.h>
+#include <deal.II/grid/tria.h>
+#include <deal.II/grid/tria_accessor.h>
+#include <deal.II/grid/tria_boundary_lib.h>
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/grid_tools.h>
+#include <deal.II/fe/mapping_q.h>
+
+#include <fstream>
+#include <iomanip>
+
+
+int main ()
+{
+  const int dim = 2;
+
+  Triangulation< dim >	tria;
+  std::map< unsigned int, Point< dim > > new_points;
+  const unsigned int N = 16;
+  GridGenerator::subdivided_hyper_cube (tria, N, -5, 5);
+
+  // find the vertex at the origin
+  Triangulation<dim>::active_cell_iterator
+    cell = GridTools::find_active_cell_around_point	(tria,Point<dim>());
+
+  unsigned int best_vertex   = cell->vertex_index(0);//vertex number on local triangulation
+  Point<dim>   best_pos      = cell->vertex(0);
+  double       best_dist     = Point<dim>().distance(best_pos);
+
+  for (unsigned int vertex_no = 1; vertex_no < GeometryInfo<dim>::vertices_per_cell; vertex_no++) {
+    const double dist = Point<dim>().distance(cell->vertex(vertex_no));
+    if (dist < best_dist)
+      {
+	best_pos    = cell->vertex(vertex_no);
+	best_vertex = cell->vertex_index(vertex_no);
+	best_dist   = dist;
+      }
+  }
+  // move the point at the origin by 2 units to the right
+  new_points[best_vertex] = Point<dim>();
+  new_points[best_vertex][0] += 2;
+
+  // now pin all of the points on the boundary
+  cell = tria.begin_active();
+  Triangulation<dim>::active_cell_iterator endc = tria.end();
+
+  for ( ; cell != endc; ++cell)
+    if (cell->at_boundary() == true)
+      for (unsigned int face = 0; face < GeometryInfo<dim>::faces_per_cell;++face)
+	if (cell->face(face)->at_boundary() == true)
+	  for (unsigned int v=0; v < GeometryInfo<dim>::vertices_per_face;++v) {
+	    unsigned int vertex_number = cell->face(face)->vertex_index(v);
+	    new_points[vertex_number] =  cell->face(face)->vertex(v);
+	  }
+
+  // then compute new point locations and output the result
+  GridTools::laplace_transform	(new_points,tria);
+  std::ofstream out ("output");
+  GridOut grid_out;
+  grid_out.write_eps (tria, out);
+}
diff --git a/tests/deal.II/grid_transform_02.output b/tests/deal.II/grid_transform_02.output
new file mode 100644
index 0000000000..86305e75be
--- /dev/null
+++ b/tests/deal.II/grid_transform_02.output
@@ -0,0 +1,653 @@
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2.39.5