# FillWindow

VTKExamples/Cxx/Images/FillWindow

### Code

FillWindow.cxx

    #include <vtkSmartPointer.h>
    #include <vtkImageData.h>
    #include <vtkCamera.h>
    #include <vtkImageMandelbrotSource.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkInteractorStyleImage.h>
    #include <vtkRenderer.h>
    #include <vtkImageSlice.h>
    #include <vtkImageSliceMapper.h>
    #include <vtkImageCast.h>
    #include <vtkImageMapper3D.h>

    int main(int, char *[])
    {
      // Create an image
      vtkSmartPointer<vtkImageMandelbrotSource> mandelbrotSource =
        vtkSmartPointer<vtkImageMandelbrotSource>::New();
      mandelbrotSource->Update();

      vtkSmartPointer<vtkImageCast> castFilter =
        vtkSmartPointer<vtkImageCast>::New();
      castFilter->SetInputConnection(mandelbrotSource->GetOutputPort());
      castFilter->SetOutputScalarTypeToUnsignedChar();
      castFilter->Update();

      vtkSmartPointer<vtkImageSliceMapper> imageSliceMapper = vtkSmartPointer<vtkImageSliceMapper>::New();
      imageSliceMapper->SetInputConnection(castFilter->GetOutputPort());

      vtkSmartPointer<vtkImageSlice> imageSlice = vtkSmartPointer<vtkImageSlice>::New();
      imageSlice->SetMapper(imageSliceMapper);

      int extent[6];
      castFilter->GetOutput()->GetExtent(extent);

      double origin[3];
      castFilter->GetOutput()->GetOrigin(origin);

      double spacing[3];
      castFilter->GetOutput()->GetSpacing(spacing);

      // Setup renderer
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      renderer->AddActor(imageSlice);
      renderer->ResetCamera();

      // Setup render window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

      vtkCamera* camera = renderer->GetActiveCamera();
      camera->ParallelProjectionOn();
      renderer->SetBackground(1,0,0);

      float xc = origin[0] + 0.5*(extent[0] + extent[1])*spacing[0];
      float yc = origin[1] + 0.5*(extent[2] + extent[3])*spacing[1];
    //  float xd = (extent[1] - extent[0] + 1)*spacing[0]; // not used
      float yd = (extent[3] - extent[2] + 1)*spacing[1];

      float d = camera->GetDistance();
      camera->SetParallelScale(0.5f*static_cast<float>(yd));
      camera->SetFocalPoint(xc,yc,0.0);
      camera->SetPosition(xc,yc,+d);

      // Setup render window interactor
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      vtkSmartPointer<vtkInteractorStyleImage> style =
        vtkSmartPointer<vtkInteractorStyleImage>::New();

      renderWindowInteractor->SetInteractorStyle(style);

      // Render and start interaction
      renderWindowInteractor->SetRenderWindow(renderWindow);
      renderWindowInteractor->Initialize();

      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(FillWindow)

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

    add_executable(FillWindow MACOSX_BUNDLE FillWindow.cxx )

    target_link_libraries(FillWindow ${VTK_LIBRARIES})

### Download and Build FillWindow

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

    cd FillWindow/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:

    ./FillWindow

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.