Circle

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.vtkRegularPolygonSource;
import vtk.vtkNativeLibrary;
import vtk.vtkPanel;
import vtk.vtkPolyDataMapper;


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


public class Circle 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 Circle() {
        super(new BorderLayout());



      vtkRegularPolygonSource PolygoneSource = new vtkRegularPolygonSource();
      PolygoneSource.SetNumberOfSides(100);
      PolygoneSource.SetRadius(5);
      PolygoneSource.SetCenter(0,0,0);
      //Uncomment below line to Visualize outline of circle
      PolygoneSource.GeneratePolygonOff();
      PolygoneSource.Update();


      vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
      Mapper.SetInputConnection(PolygoneSource.GetOutputPort());

      vtkActor Actor = new vtkActor();
      Actor.SetMapper(Mapper);

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

      // 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("Circle");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.getContentPane().setLayout(new BorderLayout());
            frame.getContentPane().add(new Circle(), BorderLayout.CENTER);
            frame.setSize(400, 400);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
          }
        });
      }
    }