t9.cpp

// -----------------------------------------------------------------------------
//
//  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;
}