# ScaleGlyphs

VTKExamples/Cxx/Visualization/ScaleGlyphs

### Code

ScaleGlyphs.cxx

    #include <vtkVersion.h>
    #include <vtkSmartPointer.h>
    #include <vtkPointData.h>
    #include <vtkCubeSource.h>
    #include <vtkPolyData.h>
    #include <vtkPoints.h>
    #include <vtkGlyph3D.h>
    #include <vtkCellArray.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkFloatArray.h>

    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);

      // Setup scales
      vtkSmartPointer<vtkFloatArray> scales =
        vtkSmartPointer<vtkFloatArray>::New();
      scales->SetName("scales");

      scales->InsertNextValue(1.0);
      scales->InsertNextValue(2.0);
      scales->InsertNextValue(3.0);

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

      // Create anything you want here, we will use a cube for the demo.
      vtkSmartPointer<vtkCubeSource> cubeSource =
        vtkSmartPointer<vtkCubeSource>::New();

      vtkSmartPointer<vtkGlyph3D> glyph3D =
        vtkSmartPointer<vtkGlyph3D>::New();
      glyph3D->SetScaleModeToScaleByScalar();
      glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
    #if VTK_MAJOR_VERSION <= 5
      glyph3D->SetInput(polydata);
    #else
      glyph3D->SetInputData(polydata);
    #endif
      glyph3D->Update();

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(glyph3D->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(1,1,1); // Background color white

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ScaleGlyphs)

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

    add_executable(ScaleGlyphs MACOSX_BUNDLE ScaleGlyphs.cxx )

    target_link_libraries(ScaleGlyphs ${VTK_LIBRARIES})

### Download and Build ScaleGlyphs

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

    cd ScaleGlyphs/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:

    ./ScaleGlyphs

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.