Dune Core Modules (2.5.0)

printgrid.hh
1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_PRINTGRID_HH
4#define DUNE_PRINTGRID_HH
5
6#include <fstream>
7#include <string>
8
12
13namespace Dune {
14
15 namespace {
16
17 template<int dim>
18 struct ElementDataLayout
19 {
20 bool contains (Dune::GeometryType gt)
21 {
22 return gt.dim()==dim;
23 }
24 };
25
26 template<int dim>
27 struct NodeDataLayout
28 {
29 bool contains (Dune::GeometryType gt)
30 {
31 return gt.dim()==0;
32 }
33 };
34
35 // Move a point closer to basegeo's center by factor scale (used for drawing relative to the element)
36 template <typename B, typename C>
37 C centrify (const B& basegeo, const C& coords, const double scale) {
38 C ret = coords;
39 ret -= basegeo.center();
40 ret *= scale;
41 ret += basegeo.center();
42 return ret;
43 }
44
45 // Add a line to the plotfile from p1 to p2
46 template <typename Coord>
47 void draw_line (std::ofstream &plotfile, const Coord &p1, const Coord &p2, std::string options) {
48 plotfile << "set object poly from ";
49 plotfile << p1[0] << "," << p1[1] << " to ";
50 plotfile << p2[0] << "," << p2[1] << " to ";
51 plotfile << p1[0] << "," << p1[1];
52 plotfile << " " << options << std::endl;
53 }
54
55 }
56
70 template <typename GridType>
71 void printGrid (const GridType& grid, const Dune::MPIHelper& helper, std::string output_file = "printgrid",
72 int size = 2000, bool execute_plot = true, bool png = true, bool local_corner_indices = true,
73 bool local_intersection_indices = true, bool outer_normals = true)
74 {
75
76 // Create output file
77 output_file = output_file + "_" + std::to_string(helper.rank());
78 std::string plot_file_name = output_file + ".gnuplot";
79 std::ofstream plotfile (plot_file_name, std::ios::out | std::ios::trunc);
80 if (!plotfile.is_open()) {
81 DUNE_THROW(Dune::IOError, "Could not create plot file " << output_file << "!");
82 return;
83 }
84
85 // Basic plot settings
86 plotfile << "set size ratio -1" << std::endl;
87 if (png) {
88 plotfile << "set terminal png size " << size << "," << size << std::endl;
89 plotfile << "set output '" << output_file << ".png'" << std::endl;
90 } else {
91 plotfile << "set terminal svg size " << size << "," << size << " enhanced background rgb 'white'" << std::endl;
92 plotfile << "set output '" << output_file << ".svg'" << std::endl;
93 }
94
95 // Get GridView
96 typedef typename GridType::LeafGridView GV;
97 const GV gv = grid.leafGridView();
98
99 // Create mappers used to retrieve indices
102 ElementMapper elementmapper(grid);
103 NodeMapper nodemapper(grid);
104
105 // Create iterators
106 typedef typename GV::template Codim<0 >::Iterator LeafIterator;
107 typedef typename GV::IntersectionIterator IntersectionIterator;
108
109 LeafIterator it = gv.template begin<0>();
110
111 // Will contain min/max coordinates. Needed for scaling of the plot
112 Dune::FieldVector<typename GridType::ctype,2> max_coord (it->geometry().center()), min_coord (max_coord);
113
114 // Iterate over elements
115 for (; it != gv.template end<0>(); ++it) {
116
117 const auto& entity = *it;
118 auto geo = entity.geometry();
119
120 // Plot element index
121 int element_id = elementmapper.index(entity);
122 plotfile << "set label at " << geo.center()[0] << "," << geo.center()[1] << " '"
123 << element_id << "' center" << std::endl;
124
125 for (int i = 0; i < geo.corners(); ++i) {
126 // Plot corner indices
127 const int globalNodeNumber1 = nodemapper.subIndex(entity, i, 2);
128 auto labelpos = centrify (geo, geo.corner(i), 0.7);
129 plotfile << "set label at " << labelpos[0] << "," << labelpos[1] << " '" << globalNodeNumber1;
130 if (local_corner_indices)
131 plotfile << "(" << i << ")";
132 plotfile << "' center" << std::endl;
133
134 // Adapt min / max coordinates
135 for (int dim = 0; dim < 2; ++dim) {
136 if (geo.corner(i)[dim] < min_coord[dim])
137 min_coord[dim] = geo.corner(i)[dim];
138 else if (geo.corner(i)[dim] > max_coord[dim])
139 max_coord[dim] = geo.corner(i)[dim];
140 }
141 }
142
143 // Iterate over intersections
144 for (IntersectionIterator is = gv.ibegin(entity); is != gv.iend(entity); ++is) {
145
146 const auto& intersection = *is;
147 auto igeo = intersection.geometry();
148
149 // Draw intersection line
150 draw_line (plotfile, igeo.corner(0), igeo.corner(1), "fs empty border 1");
151
152 // Plot local intersection index
153 if (local_intersection_indices) {
154 auto label_pos = centrify (geo, igeo.center(), 0.8);
155 plotfile << "set label at " << label_pos[0] << "," << label_pos[1]
156 << " '" << intersection.indexInInside() << "' center" << std::endl;
157 }
158
159 // Plot outer normal
160 if (outer_normals) {
161 auto intersection_pos = igeo.center();
162 auto normal = intersection.centerUnitOuterNormal();
163 normal *= 0.15 * igeo.volume();
164 auto normal_end = intersection_pos + normal;
165 plotfile << "set arrow from " << intersection_pos[0] << "," << intersection_pos[1]
166 << " to " << normal_end[0] << "," << normal_end[1] << " lt rgb \"gray\"" << std::endl;
167 }
168
169 // Get corners for inner intersection representation
170 auto inner_corner1 = centrify (geo, igeo.corner(0), 0.5);
171 auto inner_corner2 = centrify (geo, igeo.corner(1), 0.5);
172
173 // Thick line in case of boundary()
174 if (intersection.boundary())
175 draw_line (plotfile, inner_corner1, inner_corner2, "fs empty border 3 lw 4");
176
177 // Thin line with color according to neighbor()
178 if (intersection.neighbor())
179 draw_line (plotfile, inner_corner1, inner_corner2, "fs empty border 2");
180 else
181 draw_line (plotfile, inner_corner1, inner_corner2, "fs empty border 1");
182 }
183
184 }
185
186 // Finish plot, pass extend of the grid
187 Dune::FieldVector<typename GridType::ctype,2> extend (max_coord - min_coord);
188
189 extend *= 0.2;
190 min_coord -= extend;
191 max_coord += extend;
192 plotfile << "plot [" << min_coord[0] << ":" << max_coord[0] << "] [" << min_coord[1]
193 << ":" << max_coord[1] << "] NaN notitle" << std::endl;
194 plotfile.close();
195
196 if (execute_plot) {
197 std::string cmd = "gnuplot -p '" + plot_file_name + "'";
198 if (std::system (cmd.c_str()) != 0)
199 DUNE_THROW(Dune::Exception,"Error running GNUPlot: " << cmd);
200 }
201 }
202
203}
204
205#endif // #ifndef DUNE_PRINTGRID_HH
Base class for Dune-Exceptions.
Definition: exceptions.hh:94
vector space out of a tensor product of fields.
Definition: fvector.hh:93
Unique label for each type of entities that can occur in DUNE grids.
Definition: type.hh:268
Default exception class for I/O errors.
Definition: exceptions.hh:229
Mesh entities of codimension 0 ("elements") allow to visit all intersections with "neighboring" eleme...
Definition: intersectioniterator.hh:81
Multiple codim and multiple geometry type mapper for leaf entities.
Definition: mcmgmapper.hh:275
A real mpi helper.
Definition: mpihelper.hh:160
int rank() const
return rank of process
Definition: mpihelper.hh:227
A few common exception classes.
#define DUNE_THROW(E, m)
Definition: exceptions.hh:216
I trunc(const T &val, typename EpsilonType< T >::Type epsilon)
truncate using epsilon
Definition: float_cmp.cc:381
bool gt(const T &first, const T &second, typename EpsilonType< T >::Type epsilon)
test if first greater than second
Definition: float_cmp.cc:132
Mapper for multiple codim and multiple geometry types.
Helpers for dealing with MPI.
Dune namespace.
Definition: alignment.hh:11
void printGrid(const GridType &grid, const Dune::MPIHelper &helper, std::string output_file="printgrid", int size=2000, bool execute_plot=true, bool png=true, bool local_corner_indices=true, bool local_intersection_indices=true, bool outer_normals=true)
Print a grid as a gnuplot for testing and development.
Definition: printgrid.hh:71
Static tag representing a codimension.
Definition: dimension.hh:22
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