/** @see IFigure#setPreferredSize(Dimension) */
public void setPreferredSize(Dimension size) {
if (prefSize != null && prefSize.equals(size)) return;
prefSize = size;
revalidate();
}
/** @see IFigure#setMinimumSize(Dimension) */
public void setMinimumSize(Dimension d) {
if (minSize != null && minSize.equals(d)) return;
minSize = d;
revalidate();
}