/**
  * Draws the axes in the drawing panel.
  *
  * @param panel
  * @param g
  */
 public void draw(DrawingPanel panel, Graphics g) {
   if (!visible) {
     return;
   }
   if (interiorColor != null) {
     g.setColor(interiorColor);
     int gw = panel.getLeftGutter() + panel.getRightGutter();
     int gh = panel.getTopGutter() + panel.getBottomGutter();
     g.fillRect(
         panel.getLeftGutter(),
         panel.getTopGutter(),
         panel.getWidth() - gw,
         panel.getHeight() - gh);
     g.setColor(Color.lightGray);
     g.drawRect(
         panel.getLeftGutter(),
         panel.getTopGutter(),
         panel.getWidth() - gw,
         panel.getHeight() - gh);
   }
   xaxis.draw(panel, g);
   yaxis.draw(panel, g);
   titleLine.setX((panel.getXMax() + panel.getXMin()) / 2);
   if (panel.getTopGutter() > 20) {
     titleLine.setY(panel.getYMax() + 5 / panel.getYPixPerUnit());
   } else {
     titleLine.setY(panel.getYMax() - 25 / panel.getYPixPerUnit());
   }
   titleLine.draw(panel, g);
 }
 /**
  * Draws the image and the grid.
  *
  * @param panel
  * @param g
  */
 public void draw(DrawingPanel panel, Graphics g) {
   if (scaleFactor < 1) {
     g.drawImage(
         image.getScaledInstance(
             (int) (scaleFactor * image.getWidth()),
             (int) (scaleFactor * image.getHeight()),
             java.awt.Image.SCALE_REPLICATE),
         panel.getLeftGutter(),
         panel.getTopGutter(),
         panel);
   } else {
     // g.drawImage(image, 1+panel.xToPix(xmin), 1+panel.yToPix(ymax), panel);
     g.drawImage(image, panel.getLeftGutter(), panel.getTopGutter(), panel);
   }
 }