SWT program that draws a circle and plots 9 regularly-spaced points on its circumference

Circle.java

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Circle {
  public void run() {
    Display display = new Display();
    Shell shell = new Shell(display);
    createContents(shell);
    shell.open();
    while (!shell.isDisposed())
      if (!display.readAndDispatch())
        display.sleep();
    display.dispose();
  }
  
  private void createContents(Shell shell) {
    shell.setLayout(new FillLayout());
    final Canvas canvas = new Canvas(shell, SWT.NONE);
    canvas.addPaintListener(new PaintListener() {
      @Override
      public void paintControl(PaintEvent e) {
        Canvas canvas = (Canvas) e.widget;
        int width = canvas.getBounds().width - 10;
        int height = canvas.getBounds().height - 10;
        int min = Math.min(width, height);
        
        // Draw the circle
        e.gc.setLineWidth(1);
        e.gc.setForeground(Display.getCurrent().getSystemColor(SWT.COLOR_BLUE));
        e.gc.drawOval(5, 5, min, min);
        
        // Divide into 9 pieces
        int numPieces = 9;
        e.gc.setForeground(Display.getCurrent().getSystemColor(SWT.COLOR_RED));
        e.gc.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_RED));
        double cx = (5 + min) / 2.0;
        double cy = (5 + min) / 2.0;
        double radius = min / 2.0;
        double increment = 360.0 / (double) numPieces;
        for (int i = 0; i < numPieces; i++) {
          int x = (int) (cx + radius * (Math.cos(i * increment * Math.PI / 180.0)));
          int y = (int) (cy + radius * (Math.sin(i * increment * Math.PI / 180.0)));
          e.gc.fillOval(x, y, 5, 5);
        }
      }
    });
  }
  
  /**
   * @param args
   */
  public static void main(String[] args) {
    new Circle().run();
  }
}