Java Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class DrawExample {

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Drawing Example");

    Canvas canvas = new Canvas(shell, SWT.NONE);
    canvas.setSize(150, 150);
    canvas.setLocation(20, 20);
    shell.open();
    shell.setSize(200, 220);

    GC gc = new GC(canvas);
    gc.drawRectangle(10, 10, 40, 45);
    gc.drawOval(65, 10, 30, 35);
    gc.drawLine(130, 10, 90, 80);
    gc.drawPolygon(new int[] { 20, 70, 45, 90, 70, 70 });
    gc.drawPolyline(new int[] { 10, 120, 70, 100, 100, 130, 130, 75 });
    gc.dispose();

    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}