public SectionView (S section, Zoom zoom)
public SectionView (S section)
    public SectionView (S section,                        Zoom zoom)    {        this.section = section;        // Delimitating points        final int pointNb = 4 * section.getRunNb();        dspPolygon = new Polygon(new int[pointNb],                                 new int[pointNb],                                 pointNb);        // Compute zoom-dependent variables        setZoom(zoom);    }