Killer Game Programming in Java

The Animation Framework

BugPanel is a subclass of JPanel that implements the animation framework described in Chapters 2 and 3; BugPanel closely resembles the WormPanel class. The constructor sets up keyboard and mouse listeners, prepares the ImagesLoader and ClipsLoader objects, and creates the bat and ball sprites:

    public BugPanel(BugRunner br, long period)
    {
      bugTop = br;
      this.period = period;

      setDoubleBuffered(false);
      setBackground(Color.black);
      setPreferredSize( new Dimension(PWIDTH, PHEIGHT));

      setFocusable(true);
      requestFocus();    // now has focus, so receives key events

      addKeyListener( new KeyAdapter() {
        public void keyPressed(KeyEvent e)
        { processKey(e);  }   // handle key presses
      });

      // load the background image
      ImagesLoader imsLoader = new ImagesLoader(IMS_INFO);
      bgImage = imsLoader.getImage("bladerunner");

      // initialise the clips loader
      clipsLoader = new ClipsLoader(SNDS_FILE);

      // create game sprites
      bat = new BatSprite(PWIDTH, PHEIGHT, imsLoader,
                                    (int)(period/1000000L) ); // in ms
      ball = new BallSprite(PWIDTH, PHEIGHT, imsLoader,
                                   clipsLoader, this, bat);

      addMouseListener( new MouseAdapter() {
        public void mousePressed(MouseEvent e)
        { testPress(e.getX()); }  // handle mouse presses
      });


      // set up message font
      msgsFont = new Font("SansSerif", Font.BOLD, 24);
      metrics = this.getFontMetrics(msgsFont);

    }  // end of BugPanel()

The image loaded by ImagesLoader is stored in the global bgImage and later used as the game's background image (see Figure 11-1).

Warning

BladeRunner fans will ...