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Glyph2D

vtk-examples/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 question about this example, please use the VTK Discourse Forum

Code

Glyph2D.cxx

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

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkPoints> points;
  points->InsertNextPoint(0, 0, 0);
  points->InsertNextPoint(1, 1, 0);
  points->InsertNextPoint(2, 2, 0);

  vtkNew<vtkPolyData> polydata;
  polydata->SetPoints(points);

  // Create anything you want here, we will use a polygon for the demo.
  vtkNew<vtkRegularPolygonSource> polygonSource; // default is 6 sides

  vtkNew<vtkGlyph2D> glyph2D;
  glyph2D->SetSourceConnection(polygonSource->GetOutputPort());
  glyph2D->SetInputData(polydata);
  glyph2D->Update();

  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(glyph2D->GetOutputPort());
  mapper->Update();

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Salmon").GetData());

  // Visualize
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

  vtkNew<vtkInteractorStyleImage> style;
  renderWindowInteractor->SetInteractorStyle(style);

  renderWindow->SetWindowName("Glyph2D");
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Glyph2D)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  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.