/** PicturePanel.java -- show a picture inside a panel.  Actually, there are
 *  2 pictures, one for a daytime view, and the other for a nighttime view.
 *  By default we start off with the daytime picture, but whenever there is an
 *  event, we'll reset the boolean variable daytime -- this variable will let
 *  the program choose which picture to display.
 *  Since the 2 pictures are not quite the same size, we'll set the preferred
 *  size of this panel so the rest of the GUI doesn't get shifted up/down.
 */
import java.awt.*;
import javax.swing.*;

public class PicturePanel extends JPanel
{
  private boolean daytime;
  private ImageIcon dayPix, nightPix;
  private JLabel imageLabel;

  public PicturePanel()
  {
    setPreferredSize(new Dimension(300,200));

    dayPix = new ImageIcon("day.jpg");
    nightPix = new ImageIcon("night.jpg");

    // Initialize to the daytime image, and put it in the JPanel.
    daytime = true;
    imageLabel = new JLabel(dayPix);
    add(imageLabel);
  }

  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);
    if (daytime)
      imageLabel.setIcon(dayPix);
    else
      imageLabel.setIcon(nightPix);
  }

  public void setDaytime(boolean isDaytime)
  {
    daytime = isDaytime;
  }
}