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// Gmsh - Copyright (C) 1997-2019 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
#include "GmshConfig.h"
#include "Context.h"
#include "OS.h"
#include "StringUtils.h"
#include "PViewOptions.h"
#include "BoundaryAngles.h"
#include "GModel.h"
#include "discreteEdge.h"
#include "MLine.h"
#include <cstring>
#include <algorithm>
#include <string>
#include <vector>
StringXNumber BoundaryAnglesOptions_Number[] = {
{GMSH_FULLRC, "View", nullptr, -1.},
{GMSH_FULLRC, "Save", nullptr, 0.},
{GMSH_FULLRC, "Visible", nullptr, 0.},
{GMSH_FULLRC, "Remove", nullptr, 0.},
};
StringXString BoundaryAnglesOptions_String[] = {
{GMSH_FULLRC, "Filename", nullptr, "Angles_Surface"},
{GMSH_FULLRC, "Dir", nullptr, ""},
};
extern "C" {
GMSH_Plugin *GMSH_RegisterBoundaryAnglesPlugin()
{
return new GMSH_BoundaryAnglesPlugin();
}
}
std::string GMSH_BoundaryAnglesPlugin::getHelp() const
{
return "Plugin(BoundaryAngles) computes the (interior) angles between the "
"line elements on the boundary of all surfaces. The angles, computed "
"modulo 2*Pi, are stored in a new post-processing view, one for each "
"surface. The plugin currently only works for planar surfaces."
"Available options:"
"- Visible (1=True, 0 = False, Default = 1): Visibility of the Views "
"in the GUI "
"- Save (1=True, 0 = False, Default = 0): Save the Views on disk ?"
"- Remove (1=True, 0 = False, Default = 0): Remove the View from the "
"memory after execution?"
"- Filename (Default = 'Angles_Surface'): Root name for the Views (in "
"case of save / Visibility)"
"- Dir (Default = ''): Output directory (possibly nested)";
}
int GMSH_BoundaryAnglesPlugin::getNbOptions() const
{
return sizeof(BoundaryAnglesOptions_Number) / sizeof(StringXNumber);
}
StringXNumber *GMSH_BoundaryAnglesPlugin::getOption(int iopt)
{
return &BoundaryAnglesOptions_Number[iopt];
}
int GMSH_BoundaryAnglesPlugin::getNbOptionsStr() const
{
return sizeof(BoundaryAnglesOptions_String) / sizeof(StringXString);
}
StringXString *GMSH_BoundaryAnglesPlugin::getOptionStr(int iopt)
{
return &BoundaryAnglesOptions_String[iopt];
}
struct Less_EdgeEle {
bool operator()(const std::pair<MEdge, MElement *> &e1,
const std::pair<MEdge, MElement *> &e2) const
{
MEdgeLessThan le;
return le(e1.first, e2.first);
}
};
PView *GMSH_BoundaryAnglesPlugin::execute(PView *v)
{
int saveOnDisk = (int)BoundaryAnglesOptions_Number[1].def;
int viewVisible = (int)BoundaryAnglesOptions_Number[2].def;
int removeView = (int)BoundaryAnglesOptions_Number[3].def;
std::string opt_filename = BoundaryAnglesOptions_String[0].def;
std::string opt_dir = BoundaryAnglesOptions_String[1].def;
// get the mesh of the current model, and iterate on the surfaces
GModel *m = GModel::current();
for(auto it = m->firstFace(); it != m->lastFace(); ++it) {
GFace *gf = *it;
std::set<std::pair<MEdge, MElement *>, Less_EdgeEle> boundaryEdges;
for(std::size_t i = 0; i < gf->getNumMeshElements(); i++) {
MElement *e = gf->getMeshElement(i);
for(int j = 0; j < e->getNumEdges(); j++) {
std::pair<MEdge, MElement *> ed(e->getEdge(j), e);
auto it = boundaryEdges.find(ed);
if(it == boundaryEdges.end()) { boundaryEdges.insert(ed); }
else {
boundaryEdges.erase(it);
}
}
}
if(boundaryEdges.empty()) continue;
PView *view = new PView();
PViewDataList *data = getDataList(view);
std::vector<MEdge> edges;
SVector3 normal(0, 0, 1.);
for(auto it = boundaryEdges.begin(); it != boundaryEdges.end(); ++it) {
edges.push_back(it->first);
if(it == boundaryEdges.begin()) normal = it->second->getFace(0).normal();
}
std::vector<std::vector<MVertex *> > nodes;
if(SortEdgeConsecutive(edges, nodes)) {
if(nodes.size() != 1) { Msg::Warning("Non connected boundary!"); }
else {
// Preserve orientation of the mesh
// Algo: Take first edge ; find "it" in the sorted vertices and check
// order; reverse if necessary
{
// First edge (and element) of the boundary
auto it2 = boundaryEdges.begin();
// Loop on every sorted and consecutive nodes
for(int j = 0; j < static_cast<int>(nodes[0].size()) - 1; j++) {
// Find the vertex that is the starting point of the edge it2->first
if(nodes[0][j]->getNum() == it2->first.getVertex(0)->getNum()) {
// Check that next vertex is also the end-point of the edge
if(nodes[0][j + 1]->getNum() !=
it2->first.getVertex(1)->getNum()) {
std::reverse(nodes[0].begin(), nodes[0].end());
}
break;
}
}
}
// Handle last elements
nodes[0].push_back(nodes[0][1]);
// Compute angle at each point (mod 2pi)
for(std::size_t i = 0; i < nodes[0].size() - 2; i++) {
SPoint3 p1 = nodes[0][i]->point();
SPoint3 p2 = nodes[0][i + 1]->point();
SPoint3 p3 = nodes[0][i + 2]->point();
SVector3 v1(p2, p1);
SVector3 v2(p2, p3);
double a = signedAngle(v1, v2, normal);
data->SP.push_back(p2.x());
data->SP.push_back(p2.y());
data->SP.push_back(p2.z());
// Choose the angle inside the polygon
if(a > 0) a = -(2 * M_PI - a);
data->SP.push_back(a);
data->NbSP++;
}
}
}
// Filename and path
std::string currentDir =
SplitFileName(GetAbsolutePath(GModel::current()->getFileName()))[0];
// Cleaning filename (if needed)
std::string rootname = SplitFileName(opt_filename)[1];
// Output directory
// Add trailing (back)slash if needed
#if defined(WIN32)
char slash = '\\';
#else
char slash = '/';
#endif
if(opt_dir[opt_dir.length() - 1] != slash) opt_dir.push_back(slash);
std::string outputdir = currentDir + opt_dir;
CreatePath(outputdir);
// viewname and filename (=outputdir/viewname.pos)
char viewname[500];
char filename[500];
sprintf(viewname, "%s_%d", rootname.c_str(), gf->tag());
sprintf(filename, "%s%s_%d.pos", outputdir.c_str(), rootname.c_str(),
gf->tag());
data->Time.push_back(0.);
data->setName(viewname);
data->setFileName(filename);
data->finalize();
if(!viewVisible) view->getOptions()->visible = 0;
if(saveOnDisk) view->write(filename, 0, false);
if(removeView) delete view;
}
return nullptr;
}
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