shell.addListener(SWT.Paint, new Listener() {
@Override
public void handleEvent(Event event) {
GC gc = event.gc;
gc.setLineAttributes(new LineAttributes(10, SWT.CAP_FLAT, SWT.JOIN_MITER, SWT.LINE_SOLID, null, 0, 10));
gc.drawPolyline(new int[] { 50, 100, 50, 20, 60, 30, 50, 45 });
gc.setLineAttributes(new LineAttributes(1 / 2f, SWT.CAP_FLAT, SWT.JOIN_MITER, SWT.LINE_DOT, null, 0, 10));
gc.drawPolyline(new int[] { 100, 100, 100, 20, 110, 30, 100, 45 });
}
});
shell.setSize(150, 150);