# ImageImport

VTKExamples/Cxx/Images/ImageImport

### Code

ImageImport.cxx

    #include <vtkVersion.h>
    #include <vtkImageData.h>
    #include <vtkSmartPointer.h>
    #include <vtkImageImport.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkImageActor.h>
    #include <vtkInteractorStyleImage.h>
    #include <vtkXMLImageDataWriter.h>

    int main(int, char *[])
    {
      // Create a c-style image
      const int width = 4;
      const int height = 4;

      unsigned char cImage[width*height];
      unsigned char value = 0;
      for(unsigned int row = 0; row < height; ++row)
      {
        for(unsigned int col = 0; col < width; ++col)
        {
          cImage[row * width + col] = value;
          value += 10;
        }
      }

      // Convert the c-style image to a vtkImageData
      vtkSmartPointer<vtkImageImport> imageImport =
        vtkSmartPointer<vtkImageImport>::New();
      imageImport->SetDataSpacing(1, 1, 1);
      imageImport->SetDataOrigin(0, 0, 0);
      imageImport->SetWholeExtent(0, width-1, 0, height-1, 0, 0);
      imageImport->SetDataExtentToWholeExtent();
      imageImport->SetDataScalarTypeToUnsignedChar();
      imageImport->SetNumberOfScalarComponents(1);
      imageImport->SetImportVoidPointer(cImage);
      imageImport->Update();

      // Create an actor
      vtkSmartPointer<vtkImageActor> actor =
        vtkSmartPointer<vtkImageActor>::New();
    #if VTK_MAJOR_VERSION <= 5
      actor->SetInput(imageImport->GetOutput());
    #else
      actor->SetInputData(imageImport->GetOutput());
    #endif

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

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

      // 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(ImageImport)

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

    add_executable(ImageImport MACOSX_BUNDLE ImageImport.cxx)

    target_link_libraries(ImageImport ${VTK_LIBRARIES})

### Download and Build ImageImport

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

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

    cd ImageImport/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:

    ./ImageImport

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.