Glyph2D

VTKExamples/Cxx/Filtering/Glyph2D


Description

Copy a polydata to every point in the input set. We use a hexagon for the demo.

Other Languages

See (Python), (Java)

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

Glyph2D.cxx

#include <vtkSmartPointer.h>
#include <vtkRegularPolygonSource.h>
#include <vtkPolyData.h>
#include <vtkPoints.h>
#include <vtkGlyph2D.h>
#include <vtkCellArray.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkPoints> points = 
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(0,0,0);
  points->InsertNextPoint(1,1,0);
  points->InsertNextPoint(2,2,0);

  vtkSmartPointer<vtkPolyData> polydata = 
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(points);

  // Create anything you want here, we will use a polygon for the demo.
  vtkSmartPointer<vtkRegularPolygonSource> polygonSource = 
      vtkSmartPointer<vtkRegularPolygonSource>::New(); //default is 6 sides

  vtkSmartPointer<vtkGlyph2D> glyph2D = 
    vtkSmartPointer<vtkGlyph2D>::New();
  glyph2D->SetSourceConnection(polygonSource->GetOutputPort());
  glyph2D->SetInputData(polydata);
  glyph2D->Update();

  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(glyph2D->GetOutputPort());
  mapper->Update();

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

  // Visualize
  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);

  vtkSmartPointer<vtkInteractorStyleImage> style = 
    vtkSmartPointer<vtkInteractorStyleImage>::New();
  renderWindowInteractor->SetInteractorStyle( style );

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Glyph2D)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping Glyph2D: ${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(Glyph2D MACOSX_BUNDLE Glyph2D.cxx )
  target_link_libraries(Glyph2D PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(Glyph2D MACOSX_BUNDLE Glyph2D.cxx )
  target_link_libraries(Glyph2D PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS Glyph2D
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build Glyph2D

Click here to download Glyph2D and its CMakeLists.txt file. Once the tarball Glyph2D.tar has been downloaded and extracted,

cd Glyph2D/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:

./Glyph2D

WINDOWS USERS

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