# SourceObjectsDemo

VTKExamples/Cxx/GeometricObjects/SourceObjectsDemo

### Code

SourceObjectsDemo.cxx

    #include <vtkActor.h>
    #include <vtkActor2D.h>
    #include <vtkCamera.h>
    #include <vtkMath.h>

    #include <vtkNamedColors.h>
    #include <vtkPolyDataAlgorithm.h>

    #include <vtkPoints.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkSmartPointer.h>
    #include <vtkTextMapper.h>
    #include <vtkTextProperty.h>

    #include <vtkSphereSource.h>
    #include <vtkConeSource.h>
    #include <vtkCylinderSource.h>
    #include <vtkCubeSource.h>
    #include <vtkPlaneSource.h>
    #include <vtkTextSource.h>
    #include <vtkPointSource.h>
    #include <vtkDiskSource.h>
    #include <vtkLineSource.h>

    #include <array>
    #include <vector>

    int main(int, char* [])
    {
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      std::vector<vtkSmartPointer<vtkPolyDataAlgorithm>> sourceObjects;
      sourceObjects.push_back(vtkSmartPointer<vtkSphereSource>::New());
      static_cast<vtkSphereSource *>(sourceObjects.back().GetPointer())
        ->SetPhiResolution(21);
      static_cast<vtkSphereSource *>(sourceObjects.back().GetPointer())
        ->SetThetaResolution(21);

      sourceObjects.push_back(vtkSmartPointer<vtkConeSource>::New());
      static_cast<vtkConeSource *>(sourceObjects.back().GetPointer())
        ->SetResolution(51);

      sourceObjects.push_back(vtkSmartPointer<vtkCylinderSource>::New());
      static_cast<vtkCylinderSource *>(sourceObjects.back().GetPointer())
        ->SetResolution(51);

      sourceObjects.push_back(vtkSmartPointer<vtkCubeSource>::New());
      sourceObjects.push_back(vtkSmartPointer<vtkPlaneSource>::New());
      sourceObjects.push_back(vtkSmartPointer<vtkTextSource>::New());
      static_cast<vtkTextSource *>(sourceObjects.back().GetPointer())
        ->SetText("Hello");
      static_cast<vtkTextSource *>(sourceObjects.back().GetPointer())
        ->BackingOff();

      sourceObjects.push_back(vtkSmartPointer<vtkPointSource>::New());
      static_cast<vtkPointSource *>(sourceObjects.back().GetPointer())
        ->SetNumberOfPoints(500);

      sourceObjects.push_back(vtkSmartPointer<vtkDiskSource>::New());
      static_cast<vtkDiskSource *>(sourceObjects.back().GetPointer())
        ->SetCircumferentialResolution(51);

      sourceObjects.push_back(vtkSmartPointer<vtkLineSource>::New());

      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(colors->GetColor3d("Red").GetData());

      // Create a source, renderer, mapper, and actor
      // for each object
      for (unsigned int i = 0; i < sourceObjects.size(); i++)
      {
        mappers.push_back(vtkSmartPointer<vtkPolyDataMapper>::New());
        mappers[i]->SetInputConnection(
          sourceObjects[i]->GetOutputPort());

        actors.push_back(vtkSmartPointer<vtkActor>::New());
        actors[i]->SetMapper(mappers[i]);
        actors[i]->GetProperty()->SetColor(colors->GetColor3d("White").GetData());
        actors[i]->SetBackfaceProperty(backProperty);

        textmappers.push_back(vtkSmartPointer<vtkTextMapper>::New());
        textmappers[i]->SetInput(sourceObjects[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());
      }

      auto gridDimensions = 3;

      // Need a renderer even if there is no actor
      for (auto i = static_cast<int>(sourceObjects.size());
           i < gridDimensions * gridDimensions; i++)
      {
        renderers.push_back(vtkSmartPointer<vtkRenderer>::New());
      }

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

      for (auto row = 0; row < gridDimensions; row++)
      {
        for (auto col = 0; col < gridDimensions; col++)
        {
          auto index = row * gridDimensions + col;
          auto x0 = double(col) / gridDimensions;
          auto y0 = double(gridDimensions - row - 1) / gridDimensions;
          auto x1 = double(col + 1) / gridDimensions;
          auto y1 = double(gridDimensions - row) / gridDimensions;
          renderWindow->AddRenderer(renderers[index]);
          renderers[index]->SetViewport(x0, y0, x1, y1);

          if (index > static_cast<int>(sourceObjects.size() - 1))
          {
            continue;
          }

          renderers[index]->AddActor(actors[index]);
          renderers[index]->AddActor(textactors[index]);
          renderers[index]->SetBackground(colors->GetColor3d("SlateGray").GetData());
          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(SourceObjectsDemo)

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

    add_executable(SourceObjectsDemo MACOSX_BUNDLE SourceObjectsDemo.cxx )

    target_link_libraries(SourceObjectsDemo ${VTK_LIBRARIES})

### Download and Build SourceObjectsDemo

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

    cd SourceObjectsDemo/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:

    ./SourceObjectsDemo

WINDOWS USERS

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