// f.setAxisRangeX(50, 200);
// f.setAxisRangeY(100, 200);
final ImageViewer viewer = ((RotaryImageViewer) f.widget).getImageViewer();
viewer.addViewerListener(new IIJViewerListener() {
int index = 1;
@Override
public void valueChanged(IJViewerEvent event) {
// nothing to do