# RegularPolygonSource

VTKExamples/Java/GeometricObjects/RegularPolygonSource

Java Program to create a pentagon.

Author: Bharatesh Chakravarthi Affiliation: VE Lab, Chung Ang University, Seoul, South Korea.

### 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);
              }
            });
          }
        }