ProgrammableGlyphFilter

VTKExamples/Cxx/Visualization/ProgrammableGlyphFilter


Code

ProgrammableGlyphFilter.cxx

#include <vtkVersion.h>

#include <vtkSmartPointer.h>
#include <vtkPointData.h>
#include <vtkCubeSource.h>
#include <vtkConeSource.h>
#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkPoints.h>
#include <vtkProgrammableGlyphFilter.h>
#include <vtkCellArray.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkFloatArray.h>

void CalcGlyph(void *arg)
{

  vtkProgrammableGlyphFilter *glyphFilter = (vtkProgrammableGlyphFilter*) arg;

  if(!glyphFilter)
  {
    std::cerr << "glyphFilter is not valid!" << std::endl;
  }
  double pointCoords[3];
  glyphFilter->GetPoint(pointCoords);

  std::cout << "Calling CalcGlyph for point "
            << glyphFilter->GetPointId() << std::endl;
  std::cout << "Point coords are: "
            << pointCoords[0] << " "
            << pointCoords[1] << " "
            << pointCoords[2] << std::endl;
  if(glyphFilter->GetPointId() == 0)
  {
    vtkSmartPointer<vtkConeSource> coneSource =
      vtkSmartPointer<vtkConeSource>::New();
    coneSource->SetCenter(pointCoords);
#if VTK_MAJOR_VERSION <= 5
    glyphFilter->SetSource(coneSource->GetOutput());
#else
    glyphFilter->SetSourceConnection(coneSource->GetOutputPort());
#endif
  }
  else if(glyphFilter->GetPointId() == 1)
  {
    vtkSmartPointer<vtkCubeSource> cubeSource =
      vtkSmartPointer<vtkCubeSource>::New();
    cubeSource->SetCenter(pointCoords);
#if VTK_MAJOR_VERSION <= 5
    glyphFilter->SetSource(cubeSource->GetOutput());
#else
    glyphFilter->SetSourceConnection(cubeSource->GetOutputPort());
#endif
  }
  else if(glyphFilter->GetPointId() == 2)
  {
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->SetCenter(pointCoords);
#if VTK_MAJOR_VERSION <= 5
    glyphFilter->SetSource(sphereSource->GetOutput());
#else
    glyphFilter->SetSourceConnection(sphereSource->GetOutputPort());
#endif
  }
}

int main(int, char *[])
{
  // Create points
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(0,0,0);
  points->InsertNextPoint(5,0,0);
  points->InsertNextPoint(10,0,0);

  // Combine into a polydata
  vtkSmartPointer<vtkPolyData> polydata =
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(points);

  vtkSmartPointer<vtkProgrammableGlyphFilter> glyphFilter =
    vtkSmartPointer<vtkProgrammableGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
  glyphFilter->SetInput(polydata);
#else
  glyphFilter->SetInputData(polydata);
#endif
  glyphFilter->SetGlyphMethod(CalcGlyph, glyphFilter);
  //need a default glyph, but this should not be used
  vtkSmartPointer<vtkConeSource> coneSource =
    vtkSmartPointer<vtkConeSource>::New();
#if VTK_MAJOR_VERSION <= 5
  glyphFilter->SetSource(coneSource->GetOutput());
#else
  glyphFilter->SetSourceConnection(coneSource->GetOutputPort());
#endif

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(glyphFilter->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(.2, .3, .4);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ProgrammableGlyphFilter)

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

add_executable(ProgrammableGlyphFilter MACOSX_BUNDLE ProgrammableGlyphFilter.cxx )

target_link_libraries(ProgrammableGlyphFilter ${VTK_LIBRARIES})

Download and Build ProgrammableGlyphFilter

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

cd ProgrammableGlyphFilter/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:

./ProgrammableGlyphFilter

WINDOWS USERS

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