# RegularPolygonSource

VTKExamples/Java/GeometricObjects/RegularPolygonSource

### Description

Java Program to create a pentagon.

Other Languages

See (Cxx), (Python), (CSharp)

### Code

RegularPolygonSource.java

    import java.awt.BorderLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.SwingUtilities;

    import vtk.vtkActor;
    import vtk.vtkNamedColors;
    import vtk.vtkNativeLibrary;
    import vtk.vtkPanel;
    import vtk.vtkRegularPolygonSource;
    import vtk.vtkShrinkPolyData;
    import vtk.vtkPolyDataMapper;
    import vtk.vtkProperty;

    public class RegularPolygonSource extends JPanel implements ActionListener {
      private static final long serialVersionUID = 1L;
      private vtkPanel renWin;
      private JButton exitButton;

      // -----------------------------------------------------------------
      // Load VTK library and print which library was not properly loaded
      static {
        if (!vtkNativeLibrary.LoadAllNativeLibraries()) {
          for (vtkNativeLibrary lib : vtkNativeLibrary.values()) {
            if (!lib.IsLoaded()) {
              System.out.println(lib.GetLibraryName() + " not loaded");
            }
          }
        }
        vtkNativeLibrary.DisableOutputWindow(null);
      }
      // -----------------------------------------------------------------

      public RegularPolygonSource() {
        super(new BorderLayout());

        vtkNamedColors Color = new vtkNamedColors();

        //For Actor Color
        double ActorColor[] = new double[4];
        //Renderer Background Color
        double BgColor[] = new double[4];
        //BackFace color
        double BackColor[] = new double[4];

        //Change Color Name to Use your own Color for Change Actor Color
        Color.GetColor("DarkMagenta",ActorColor);
        //Change Color Name to Use your own Color for Renderer Background
        Color.GetColor("White",BgColor);
        //Change Color Name to Use your own Color for BackFace Color
        Color.GetColor("Yellow",BackColor);

        vtkRegularPolygonSource PolygonSource = new vtkRegularPolygonSource();
        PolygonSource.SetNumberOfSides(5);
        PolygonSource.SetRadius(5);
        PolygonSource.SetCenter(0,0,0);

        //shrink cells composing an arbitrary data set
        vtkShrinkPolyData shrink = new vtkShrinkPolyData();
        shrink.SetInputConnection(PolygonSource.GetOutputPort());
        shrink.SetShrinkFactor(.9);

        //Create a Mapper and Actor
        vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
        Mapper.SetInputConnection(shrink.GetOutputPort());

        vtkProperty Back = new vtkProperty();
        Back.SetColor(BackColor);

        vtkActor Actor = new vtkActor();
        Actor.SetMapper(Mapper);
        Actor.GetProperty().EdgeVisibilityOn();
        Actor.GetProperty().SetLineWidth(5);
        Actor.GetProperty().SetColor(ActorColor);
        Actor.SetBackfaceProperty(Back);

        renWin = new vtkPanel();
        renWin.GetRenderer().AddActor(Actor);
        renWin.resetCamera();
        renWin.GetRenderer().SetBackground(BgColor);

        // Add Java UI components
        exitButton = new JButton("Exit");
        exitButton.addActionListener(this);

        add(renWin, BorderLayout.CENTER);
        add(exitButton, BorderLayout.SOUTH);
      }

      /** An ActionListener that listens to the button. */
      public void actionPerformed(ActionEvent e) {
        if (e.getSource().equals(exitButton)) {
          System.exit(0);
        }
      }

      public static void main(String s[]) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
              JFrame frame = new JFrame("Regular Polygon Source");
              frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              frame.getContentPane().setLayout(new BorderLayout());
              frame.getContentPane().add(new RegularPolygonSource(), BorderLayout.CENTER);
              frame.setSize(400, 400);
              frame.setLocationRelativeTo(null);
              frame.setVisible(true);
            }
          });
      }
    }