@Override
    public Line2D.Float transformLine(int x1, int y1, int x2, int y2) {
      return new Line2D.Float(x2,
                              Math.abs(y2),
                              x1,
                              Math.abs(y1));
    }
@Override
    public Line2D.Float transformLine(int x1, int y1, int x2, int y2)