# LabeledDataMapper

VTKExamples/Cxx/Visualization/LabeledDataMapper

### Description

This example demonstrates how to display the point ID at each point.

### Code

LabeledDataMapper.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPointSource.h>
    #include <vtkPolyData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkLabeledDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkActor.h>
    #include <vtkActor2D.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      // Create a point set
      vtkSmartPointer<vtkPointSource> pointSource =
        vtkSmartPointer<vtkPointSource>::New();
      pointSource->SetNumberOfPoints(10);
      pointSource->Update();

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> pointMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      pointMapper->SetInputConnection(pointSource->GetOutputPort());

      vtkSmartPointer<vtkActor> pointActor =
        vtkSmartPointer<vtkActor>::New();
      pointActor->SetMapper(pointMapper);
      pointActor->GetProperty()->SetPointSize(10);
      pointActor->GetProperty()->SetColor(1, 1, .4);

      vtkSmartPointer<vtkLabeledDataMapper> labelMapper =
        vtkSmartPointer<vtkLabeledDataMapper>::New();
      labelMapper->SetInputConnection(pointSource->GetOutputPort());
      vtkSmartPointer<vtkActor2D> labelActor =
        vtkSmartPointer<vtkActor2D>::New();
      labelActor->SetMapper(labelMapper);

      // 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(pointActor);
      renderer->AddActor(labelActor);

      renderer->SetBackground(.1, .3, .2); // Background color green

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(LabeledDataMapper)

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

    add_executable(LabeledDataMapper MACOSX_BUNDLE LabeledDataMapper.cxx )

    target_link_libraries(LabeledDataMapper ${VTK_LIBRARIES})

### Download and Build LabeledDataMapper

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

    cd LabeledDataMapper/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:

    ./LabeledDataMapper

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.