private PaintableElevator paintableObject;
private Line2D wallLeftSide = new Line2D.Double();
private Line2D wallRightSide = new Line2D.Double();
private Rectangle2D elevator = new Rectangle2D.Double();

@Override
public void componentResized (ComponentEvent e)
{
wallLeftSide.setLine(new Point2D.Double(0, changeYCoordsOrigin(getHeight() * paintableObject.getTotalHeight())), new Point2D.Double(0, getWidth()));

wallRightSide.setLine(new Point2D.Double(getWidth(), changeYCoordsOrigin(getHeight() * paintableObject.getTotalHeight())), new Point2D.Double(getWidth(), getHeight()));

elevator.setRect(0, changeYCoordsOrigin(getHeight() * paintableObject.getHeightInShaft()), getWidth(), paintableObject.getCabinHeight() * getHeight() *-1);
}

public double changeYCoordsOrigin (double coord)
{
   return getHeight() - coord;
}

@Override
public void setHeigth (double height)
{
elevator.setRect(0, getHeight() * height, getWidth(), paintableObject.getCabinHeight());
repaint();
}

@Override
public void paint (Graphics g)
{
   if (g instanceof Graphics2D)
   {
       Graphics2D g2 = (Graphics2D) g;
       g2.draw(wallLeftSide);
       g2.draw(wallRightSide);
       g2.setBackground(Color.gray);
       g2.draw(elevator);
    }
}