Chaste Commit::baa90ac2819b962188b7562f2326be23c47859a7
ToroidalHoneycombVertexMeshGenerator.cpp
1/*
2
3Copyright (c) 2005-2024, University of Oxford.
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23THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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34*/
35
36#include "ToroidalHoneycombVertexMeshGenerator.hpp"
37#include <boost/make_shared.hpp>
38#include <boost/shared_ptr.hpp>
39
41 unsigned numElementsUp,
42 double cellRearrangementThreshold,
43 double t2Threshold)
44{
45 // numElementsAcross and numElementsUp must be even for toroidal meshes
46 assert(numElementsAcross > 1);
47 assert(numElementsUp > 1);
48 assert(numElementsAcross%2 == 0);
49 assert(numElementsUp%2 == 0);
50
51 assert(cellRearrangementThreshold > 0.0);
52 assert(t2Threshold > 0.0);
53
54 std::vector<Node<2>*> nodes;
55 std::vector<VertexElement<2,2>*> elements;
56
57 unsigned node_index = 0;
58 unsigned node_indices[6];
59 unsigned element_index;
60
61 // Create the nodes
62 for (unsigned j=0; j<2*numElementsUp; j++)
63 {
64 for (unsigned i=0; i<numElementsAcross; i++)
65 {
66 double x_coord = ((j%4 == 0)||(j%4 == 3)) ? i+0.5 : i;
67 double y_coord = (1.5*j - 0.5*(j%2))*0.5/sqrt(3.0);
68
69 Node<2>* p_node = new Node<2>(node_index, false , x_coord, y_coord);
70 nodes.push_back(p_node);
71 node_index++;
72 }
73 }
74
75 /*
76 * Create the elements. The array node_indices contains the
77 * global node indices from bottom, going anticlockwise.
78 */
79 for (unsigned j=0; j<numElementsUp; j++)
80 {
81 for (unsigned i=0; i<numElementsAcross; i++)
82 {
83 element_index = j*numElementsAcross + i;
84
85 node_indices[0] = 2*j*numElementsAcross + i + 1*(j%2==1);
86 node_indices[1] = node_indices[0] + numElementsAcross + 1*(j%2==0);
87 node_indices[2] = node_indices[0] + 2*numElementsAcross + 1*(j%2==0);
88 node_indices[3] = node_indices[0] + 3*numElementsAcross;
89 node_indices[4] = node_indices[0] + 2*numElementsAcross - 1*(j%2==1);
90 node_indices[5] = node_indices[0] + numElementsAcross - 1*(j%2==1);
91
92 if (i == numElementsAcross-1) // on far right
93 {
94 node_indices[0] -= numElementsAcross*(j%2==1);
95 node_indices[1] -= numElementsAcross;
96 node_indices[2] -= numElementsAcross;
97 node_indices[3] -= numElementsAcross*(j%2==1);
98 }
99 if (j == numElementsUp-1) // on far top
100 {
101 node_indices[2] -= 2*numElementsAcross*numElementsUp;
102 node_indices[3] -= 2*numElementsAcross*numElementsUp;
103 node_indices[4] -= 2*numElementsAcross*numElementsUp;
104 }
105
106 std::vector<Node<2>*> element_nodes;
107 for (unsigned k=0; k<6; k++)
108 {
109 element_nodes.push_back(nodes[node_indices[k]]);
110 }
111 VertexElement<2,2>* p_element = new VertexElement<2,2>(element_index, element_nodes);
112 elements.push_back(p_element);
113 }
114 }
115
116 double mesh_width = numElementsAcross;
117 double mesh_height = 1.5*numElementsUp/sqrt(3.0);
118
119 mpMesh = boost::make_shared<Toroidal2dVertexMesh>(mesh_width, mesh_height, nodes, elements, cellRearrangementThreshold, t2Threshold);
120}
121
122boost::shared_ptr<MutableVertexMesh<2,2> > ToroidalHoneycombVertexMeshGenerator::GetMesh()
123{
124 EXCEPTION("A toroidal mesh was created but a normal mesh is being requested.");
125 return mpMesh; // Not really
126}
127
128boost::shared_ptr<Toroidal2dVertexMesh> ToroidalHoneycombVertexMeshGenerator::GetToroidalMesh()
129{
130 return boost::static_pointer_cast<Toroidal2dVertexMesh>(mpMesh);
131}
#define EXCEPTION(message)
boost::shared_ptr< MutableVertexMesh< 2, 2 > > mpMesh
Definition Node.hpp:59
ToroidalHoneycombVertexMeshGenerator(unsigned numElementsAcross, unsigned numElementsUp, double cellRearrangementThreshold=0.01, double t2Threshold=0.001)
boost::shared_ptr< Toroidal2dVertexMesh > GetToroidalMesh()
boost::shared_ptr< MutableVertexMesh< 2, 2 > > GetMesh()