# ParametricObjectsDemo2

VTKExamples/Cxx/GeometricObjects/ParametricObjectsDemo2

### Code

ParametricObjectsDemo2.cxx

    #include <vtkSmartPointer.h>
    #include <vtkCamera.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkTextMapper.h>
    #include <vtkActor.h>
    #include <vtkActor2D.h>
    #include <vtkProperty.h>
    #include <vtkTextProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkParametricFunctionSource.h>
    #include <vtkMath.h>
    #include <vtkPoints.h>

    #include <vtkParametricBohemianDome.h>
    #include <vtkParametricBour.h>
    #include <vtkParametricCatalanMinimal.h>
    #include <vtkParametricFunction.h>
    #include <vtkParametricHenneberg.h>
    #include <vtkParametricKuen.h>
    #include <vtkParametricPluckerConoid.h>
    #include <vtkParametricPseudosphere.h>

    #include <vector>

    int main(int, char *[])
    {
      // Select one of the following (matching the selection above)
      std::vector<vtkSmartPointer<vtkParametricFunction> > parametricObjects;

      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricBohemianDome>::New());
      static_cast<vtkParametricBohemianDome*>(
        parametricObjects.back().GetPointer())->SetA(5.0);
      static_cast<vtkParametricBohemianDome*>(
        parametricObjects.back().GetPointer())->SetB(1.0);
      static_cast<vtkParametricBohemianDome*>(
        parametricObjects.back().GetPointer())->SetC(2.0);
      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricBour>::New());
      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricCatalanMinimal>::New());
      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricHenneberg>::New());
      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricKuen>::New());
      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricPluckerConoid>::New());
      parametricObjects.push_back(
        vtkSmartPointer<vtkParametricPseudosphere>::New());

      std::vector<vtkSmartPointer<vtkParametricFunctionSource> >
        parametricFunctionSources;
      std::vector<vtkSmartPointer<vtkRenderer> >
        renderers;
      std::vector<vtkSmartPointer<vtkPolyDataMapper> >
        mappers;
      std::vector<vtkSmartPointer<vtkActor> >
        actors;
      std::vector<vtkSmartPointer<vtkTextMapper> >
        textmappers;
      std::vector<vtkSmartPointer<vtkActor2D> >
        textactors;

      // Create one text property for all
      vtkSmartPointer<vtkTextProperty> textProperty =
        vtkSmartPointer<vtkTextProperty>::New();
      textProperty->SetFontSize(10);
      textProperty->SetJustificationToCentered();

      vtkSmartPointer<vtkProperty> backProperty =
        vtkSmartPointer<vtkProperty>::New();
      backProperty->SetColor(1.0, 0.0, 0.0);

      // Create a parametric function source, renderer, mapper, and actor
      // for each object
      for(unsigned int i = 0; i < parametricObjects.size(); i++)
      {
        parametricFunctionSources.push_back(
          vtkSmartPointer<vtkParametricFunctionSource>::New());
        parametricFunctionSources[i]->SetParametricFunction(parametricObjects[i]);
        parametricFunctionSources[i]->Update();

        mappers.push_back(vtkSmartPointer<vtkPolyDataMapper>::New());
        mappers[i]->SetInputConnection(
          parametricFunctionSources[i]->GetOutputPort());

        actors.push_back(vtkSmartPointer<vtkActor>::New());
        actors[i]->SetMapper(mappers[i]);
        actors[i]->SetBackfaceProperty(backProperty);

        textmappers.push_back(vtkSmartPointer<vtkTextMapper>::New());
        textmappers[i]->SetInput(parametricObjects[i]->GetClassName());
        textmappers[i]->SetTextProperty(textProperty);

        textactors.push_back(vtkSmartPointer<vtkActor2D>::New());
        textactors[i]->SetMapper(textmappers[i]);
        textactors[i]->SetPosition(100, 16);
        renderers.push_back(vtkSmartPointer<vtkRenderer>::New());
      }
      unsigned int gridXDimensions = 4;
      unsigned int gridYDimensions = 2;

      // Need a renderer even if there is no actor
      for(size_t i = parametricObjects.size();
          i < gridXDimensions * gridYDimensions;
          i++)
      {
        renderers.push_back(vtkSmartPointer<vtkRenderer>::New());
      }

      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      int rendererSize = 200;
      renderWindow->SetSize(
        rendererSize*gridXDimensions, rendererSize*gridYDimensions);

      for(int row = 0; row < static_cast<int>(gridYDimensions); row++)
      {
        for(int col = 0; col < static_cast<int>(gridXDimensions); col++)
        {
          int index = row*gridXDimensions + col;

          // (xmin, ymin, xmax, ymax)
          double viewport[4] =
            {static_cast<double>(col) * rendererSize / (gridXDimensions * rendererSize),
             static_cast<double>(gridYDimensions - (row+1)) * rendererSize / (gridYDimensions * rendererSize),
             static_cast<double>(col+1)*rendererSize / (gridXDimensions * rendererSize),
             static_cast<double>(gridYDimensions - row) * rendererSize / (gridYDimensions * rendererSize)};
          renderWindow->AddRenderer(renderers[index]);
          renderers[index]->SetViewport(viewport);
          if(index > static_cast<int>(parametricObjects.size() - 1))
          {
            continue;
          }
          renderers[index]->AddActor(actors[index]);
          renderers[index]->AddActor(textactors[index]);
          renderers[index]->SetBackground(.2, .3, .4);
          renderers[index]->ResetCamera();
          renderers[index]->GetActiveCamera()->Azimuth(30);
          renderers[index]->GetActiveCamera()->Elevation(-30);
          renderers[index]->GetActiveCamera()->Zoom(0.9);
          renderers[index]->ResetCameraClippingRange();
        }
      }

      vtkSmartPointer<vtkRenderWindowInteractor> interactor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      interactor->SetRenderWindow(renderWindow);

      renderWindow->Render();
      interactor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ParametricObjectsDemo2)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(ParametricObjectsDemo2 MACOSX_BUNDLE ParametricObjectsDemo2.cxx )

    target_link_libraries(ParametricObjectsDemo2 ${VTK_LIBRARIES})

### Download and Build ParametricObjectsDemo2

Click here to download ParametricObjectsDemo2 and its CMakeLists.txt file. Once the tarball ParametricObjectsDemo2.tar has been downloaded and extracted,

    cd ParametricObjectsDemo2/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./ParametricObjectsDemo2

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.