make GridGenerator::hyper_ball_balanced() work with nonzero origins.

diff --git a/doc/news/changes/minor/20220209DavidWells b/doc/news/changes/minor/20220209DavidWells
new file mode 100644 (file)
index 0000000..81954d1
--- /dev/null
+++ b/doc/news/changes/minor/20220209DavidWells
@@ -0,0 +1,4 @@
+Fixed: GridGenerator::hyper_ball_balanced() now works correctly with nonzero
+centers.
+<br>
+(David Wells, 2022/02/09)

diff --git a/source/grid/grid_generator.cc b/source/grid/grid_generator.cc
index 5b935f3ca64f021633e18d592a26992a13572f96..1f7187a11877b9519b8adf5852ee4ce4692a16c8 100644 (file)
--- a/source/grid/grid_generator.cc
+++ b/source/grid/grid_generator.cc
@@ -5835,9 +5835,12 @@ namespace GridGenerator
     // a time by appropriate rotations, starting from the quarter ball. The
     // rotations make sure we do not generate inverted cells that would appear
     // if we tried the slightly simpler approach to simply mirror the cells.
+    //
+    // Make the rotations easy by centering at the origin now and shifting by p
+    // later.
 
     Triangulation<dim> tria_piece;
-    GridGenerator::quarter_hyper_ball(tria_piece, p, radius);
+    GridGenerator::quarter_hyper_ball(tria_piece, Point<dim>(), radius);
 
     for (unsigned int round = 0; round < dim; ++round)
       {
@@ -5910,6 +5913,7 @@ namespace GridGenerator
         cell->set_manifold_id(1);
       else
         cell->set_all_manifold_ids(numbers::flat_manifold_id);
+    GridTools::shift(p, tria);
 
     tria.set_all_manifold_ids_on_boundary(0);
     tria.set_manifold(0, SphericalManifold<dim>(p));

diff --git a/tests/grid/grid_generator_hyper_ball_balanced.cc b/tests/grid/grid_generator_hyper_ball_balanced.cc
index 94bdadf8a5f5c7a7693920457a02090ee4500971..40c281c9bceaf57ee135ed2787029651821bb068 100644 (file)
--- a/tests/grid/grid_generator_hyper_ball_balanced.cc
+++ b/tests/grid/grid_generator_hyper_ball_balanced.cc
@@ -28,22 +28,31 @@ template <int dim>
 void
 check_grid()
 {
-  Triangulation<dim> triangulation;
-  GridGenerator::hyper_ball_balanced(triangulation, Point<dim>(), 1.);
-  deallog << "Number of cells: " << triangulation.n_cells() << std::endl;
-  deallog << "Number of vertices: " << triangulation.n_vertices() << std::endl;
-  triangulation.refine_global();
-
-  GridOut            go;
-  GridOutFlags::XFig xfig_flags;
-  xfig_flags.fill_style = 25;
-
-  go.set_flags(xfig_flags);
-  GridOut::OutputFormat format = GridOut::xfig;
-  if (dim == 3)
-    format = GridOut::dx;
-
-  go.write(triangulation, deallog.get_file_stream(), format);
+  // Check centered at the origin and at another point
+  std::array<Point<dim>, 2> centers;
+  centers[1][0]       = 0.6;
+  centers[1][1]       = 0.5;
+  centers[1][dim - 1] = 0.5;
+  for (const Point<dim> &center : centers)
+    {
+      Triangulation<dim> triangulation;
+      GridGenerator::hyper_ball_balanced(triangulation, center, 1.);
+      deallog << "Number of cells: " << triangulation.n_cells() << std::endl;
+      deallog << "Number of vertices: " << triangulation.n_vertices()
+              << std::endl;
+      triangulation.refine_global();
+
+      GridOut            go;
+      GridOutFlags::XFig xfig_flags;
+      xfig_flags.fill_style = 25;
+
+      go.set_flags(xfig_flags);
+      GridOut::OutputFormat format = GridOut::xfig;
+      if (dim == 3)
+        format = GridOut::dx;
+
+      go.write(triangulation, deallog.get_file_stream(), format);
+    }
 }
 
 

diff --git a/tests/grid/grid_generator_hyper_ball_balanced.output b/tests/grid/grid_generator_hyper_ball_balanced.output
index 6f56607ce29fec3887878956057865faf7c31150..327f201b02dae411fa27104a5f6501a2645c5351 100644 (file)
--- a/tests/grid/grid_generator_hyper_ball_balanced.output
+++ b/tests/grid/grid_generator_hyper_ball_balanced.output
@@ -560,6 +560,567 @@ Single
        514     514
        681     681
        849     358
+DEAL::Number of cells: 12
+DEAL::Number of vertices: 17
+#FIG 3.2
+Landscape
+Center
+Inches
+A4
+100.00
+Single
+-3
+# generated by deal.II GridOut class
+# reduce first number to scale up image
+1200 2
+0 32 #ff0000
+0 33 #ff8000
+0 34 #ffd000
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 DEAL::Number of cells: 32
 DEAL::Number of vertices: 53
 object "vertices" class array type float rank 1 shape 3 items 321 data follows
@@ -1164,3 +1725,607 @@ component "level" value "level"
 object "grid data" class group
 member "cells" value "cell data"
 end
+DEAL::Number of cells: 32
+DEAL::Number of vertices: 53
+object "vertices" class array type float rank 1 shape 3 items 321 data follows
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+       320     287     274     180     269     175     156     51
+attribute "element type" string "cubes"
+attribute "ref" string "positions"
+
+object "material" class array type int rank 0 items 256 data follows
+ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+attribute "dep" string "connections"
+
+object "level" class array type int rank 0 items 256 data follows
+ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
+attribute "dep" string "connections"
+
+object "deal data" class field
+component "positions" value "vertices"
+component "connections" value "cells"
+object "cell data" class field
+component "positions" value "vertices"
+component "connections" value "cells"
+component "material" value "material"
+component "level" value "level"
+
+object "grid data" class group
+member "cells" value "cell data"
+end