# TransformFilter

VTKExamples/Cxx/PolyData/TransformFilter

### Description

This example stretches an arrow.

### Code

TransformFilter.cxx

    #include <vtkSmartPointer.h>

    #include <vtkArrowSource.h>
    #include <vtkPolyData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkTransform.h>
    #include <vtkTransformFilter.h>

    int main(int, char *[])
    {
      // Create an arrow.
      vtkSmartPointer<vtkArrowSource> arrowSource =
        vtkSmartPointer<vtkArrowSource>::New();

      vtkSmartPointer<vtkTransform> transform =
        vtkSmartPointer<vtkTransform>::New();
      transform->Scale(5,1,1);

      vtkSmartPointer<vtkTransformFilter> transformFilter =
        vtkSmartPointer<vtkTransformFilter>::New();
      transformFilter->SetInputConnection(arrowSource->GetOutputPort());
      transformFilter->SetTransform(transform);

      // Visualize
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(transformFilter->GetOutputPort());
      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      renderer->AddActor(actor);
      renderer->SetBackground(.2, .3, .4);

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(TransformFilter)

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

    add_executable(TransformFilter MACOSX_BUNDLE TransformFilter.cxx)

    target_link_libraries(TransformFilter ${VTK_LIBRARIES})

### Download and Build TransformFilter

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 Some tarballs may be missing or out-of-date.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 TransformFilter and its CMakeLists.txt file. Once the tarball TransformFilter.tar has been downloaded and extracted,

    cd TransformFilter/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:

    ./TransformFilter

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.