# ImageToStructuredPoints

VTKExamples/Cxx/Images/ImageToStructuredPoints

### Code

ImageToStructuredPoints.cxx

    #include <vtkSmartPointer.h>
    #include <vtkImageData.h>
    #include <vtkStructuredPoints.h>
    #include <vtkImageCanvasSource2D.h>
    #include <vtkImageToStructuredPoints.h>
    #include <vtkDataSetMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      // Create an image
      vtkSmartPointer<vtkImageCanvasSource2D> source =
        vtkSmartPointer<vtkImageCanvasSource2D>::New();
      source->SetExtent(0, 20, 0, 20, 0, 0);
      source->SetScalarTypeToUnsignedChar();
      source->SetNumberOfScalarComponents(3);
      source->SetDrawColor(127,127,127);
      source->FillBox(0,20,0,20);
      source->SetDrawColor(255,127,127);
      source->FillBox(0,15,0,20);
      source->Update();

      vtkSmartPointer<vtkImageToStructuredPoints> convertFilter =
        vtkSmartPointer<vtkImageToStructuredPoints>::New();
      convertFilter->SetInputConnection(source->GetOutputPort());
      convertFilter->Update();

    //  vtkStructuredPoints* structuredPoints = convertFilter->GetStructuredPointsOutput();

      // Create a mapper and actor
      vtkSmartPointer<vtkDataSetMapper> mapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      mapper->SetInputConnection(convertFilter->GetOutputPort());

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      // Create a renderer, render window, and interactor
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // Add the actor to the scene
      renderer->AddActor(actor);
      renderer->SetBackground(.3, .6, .3); // Background color green

      // Render and interact
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ImageToStructuredPoints)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkCommonExecutionModel
      vtkImagingSources
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping ImageToStructuredPoints: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(ImageToStructuredPoints MACOSX_BUNDLE ImageToStructuredPoints.cxx )
      target_link_libraries(ImageToStructuredPoints PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(ImageToStructuredPoints MACOSX_BUNDLE ImageToStructuredPoints.cxx )
      target_link_libraries(ImageToStructuredPoints PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS ImageToStructuredPoints
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build ImageToStructuredPoints

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

    cd ImageToStructuredPoints/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:

    ./ImageToStructuredPoints

WINDOWS USERS

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