LabeledDataMapper

VTKExamples/Cxx/Visualization/LabeledDataMapper


Description

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

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

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 3.3 FATAL_ERROR)

project(LabeledDataMapper)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingLabel
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping LabeledDataMapper: ${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(LabeledDataMapper MACOSX_BUNDLE LabeledDataMapper.cxx )
  target_link_libraries(LabeledDataMapper PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(LabeledDataMapper MACOSX_BUNDLE LabeledDataMapper.cxx )
  target_link_libraries(LabeledDataMapper PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS LabeledDataMapper
    MODULES ${VTK_LIBRARIES}
    )
endif () 

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

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