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41 results

Get_ElementSource.cpp

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  • t9.cpp 3.40 KiB
    // -----------------------------------------------------------------------------
    //
    //  Gmsh C++ tutorial 9
    //
    //  Plugins
    //
    // -----------------------------------------------------------------------------
    
    // Plugins can be added to Gmsh in order to extend its capabilities. For
    // example, post-processing plugins can modify views, or create new views based
    // on previously loaded views. Several default plugins are statically linked
    // with Gmsh, e.g. Isosurface, CutPlane, CutSphere, Skin, Transform or Smooth.
    //
    // Plugins can be controlled through the API functions in the `gmsh::plugin'
    // namespace, or from the graphical interface (right click on the view button,
    // then `Plugins').
    
    #include <set>
    #include <gmsh.h>
    
    int main(int argc, char **argv)
    {
      gmsh::initialize();
    
      gmsh::model::add("t9");
    
      // Let us for example include a three-dimensional scalar view:
      try {
        gmsh::merge("../view3.pos");
      } catch(...) {
        gmsh::logger::write("Could not load post-processing views: bye!");
        gmsh::finalize();
        return 0;
      }
    
      std::vector<int> v;
      gmsh::view::getTags(v);
      if(v.size() != 1) {
        gmsh::logger::write("Wrong number of views!", "error");
        gmsh::finalize();
        return 1;
      }
    
      // We then set some options for the `Isosurface' plugin (which extracts an
      // isosurface from a 3D scalar view), and run it:
      gmsh::plugin::setNumber("Isosurface", "Value", 0.67); // Iso-value level
      gmsh::plugin::setNumber("Isosurface", "View", 0); // Source view is View[0]
      int v1 = gmsh::plugin::run("Isosurface"); // Run the plugin!
    
      // We also set some options for the `CutPlane' plugin (which computes a
      // section of a 3D view using the plane A*x+B*y+C*z+D=0), and then run it:
      gmsh::plugin::setNumber("CutPlane", "A", 0);
      gmsh::plugin::setNumber("CutPlane", "B", 0.2);
      gmsh::plugin::setNumber("CutPlane", "C", 1);
      gmsh::plugin::setNumber("CutPlane", "D", 0);
      gmsh::plugin::setNumber("CutPlane", "View", 0);
      int v2 = gmsh::plugin::run("CutPlane");
    
      // Add a title (By convention, for window coordinates a value greater than
      // 99999 represents the center. We could also use `General.GraphicsWidth / 2',
      // but that would only center the string for the current window size.):
      gmsh::plugin::setString("Annotate", "Text", "A nice title");
      gmsh::plugin::setNumber("Annotate", "X", 1.e5);
      gmsh::plugin::setNumber("Annotate", "Y", 50);
      gmsh::plugin::setString("Annotate", "Font", "Times-BoldItalic");
      gmsh::plugin::setNumber("Annotate", "FontSize", 28);
      gmsh::plugin::setString("Annotate", "Align", "Center");
      gmsh::plugin::setNumber("Annotate", "View", 0);
      gmsh::plugin::run("Annotate");
    
      gmsh::plugin::setString("Annotate", "Text", "(and a small subtitle)");
      gmsh::plugin::setNumber("Annotate", "Y", 70);
      gmsh::plugin::setString("Annotate", "Font", "Times-Roman");
      gmsh::plugin::setNumber("Annotate", "FontSize", 12);
      gmsh::plugin::run("Annotate");
    
      // We finish by setting some options:
      gmsh::view::option::setNumber(v[0], "Light", 1);
      gmsh::view::option::setNumber(v[0], "IntervalsType", 1);
      gmsh::view::option::setNumber(v[0], "NbIso", 6);
      gmsh::view::option::setNumber(v[0], "SmoothNormals", 1);
      gmsh::view::option::setNumber(v1, "IntervalsType", 2);
      gmsh::view::option::setNumber(v2, "IntervalsType", 2);
    
      // Launch the GUI to see the results:
      std::set<std::string> args(argv, argv + argc);
      if(!args.count("-nopopup")) gmsh::fltk::run();
    
      gmsh::finalize();
      return 0;
    }