The Animation Framework

Start Jack Jumping

JumpingJack fixes the frame rate at 30 FPS; anything faster makes it almost impossible to control Jack. The illusion of speed is governed by how fast the bricks and image ribbons move, which is controlled by a single moveSize variable in the BricksManager class. moveSize specifies the distance that the bricks layer should be shifted in each update of the animation loop.

It loads and starts playing a "Jumping Jack Flash" MIDI file using the MidisLoader class developed in Chapter 8:

     // global     private MidisLoader midisLoader;     midisLoader = new MidisLoader( );     midisLoader.load("jjf", "jumping_jack_flash.mid");     midisLoader.play("jjf", true);   // repeatedly play it

The file is played repeatedly until it's stopped as the application window closes:

     // global     private JackPanel jp;  // where the game is drawn     public void windowClosing(WindowEvent e)     { jp.stopGame( );  // stop the game       midisLoader.close( );     }

JumpingJack sets up window listener methods for pausing and resuming the game, in a similar way to the BugRunner application in Chapter 11. For example, window iconification/deiconification causes the game in the JackPanel object, jp, to be paused/resumed:

     public void windowIconified(WindowEvent e)     {  jp.pauseGame( ); }   // jp is the JackPanel object     public void windowDeiconified(WindowEvent e)     {  jp.resumeGame( );  }