www.pudn.com > resources.zip > GameThread.java

package net.frog_parrot.jump;

/**
 * This class contains the loop that keeps the game running.
 *
 * @author Carol Hamer
 */
public class GameThread extends Thread {

  //---------------------------------------------------------
  //   fields

  /**
   * Whether or not the main thread would like this thread 
   * to pause.
   */
  boolean myShouldPause;

  /**
   * Whether or not the main thread would like this thread 
   * to stop.
   */
  static boolean myShouldStop;

  /**
   * Whether or not this thread has been started.
   */
  boolean myAlreadyStarted;

  /**
   * A handle back to the graphical components.
   */
  JumpCanvas myJumpCanvas;

  //----------------------------------------------------------
  //   initialization

  /**
   * standard constructor.
   */
  GameThread(JumpCanvas canvas) {
    myJumpCanvas = canvas;
  }

  //----------------------------------------------------------
  //   actions

  /**
   * start or pause or unpause the game.
   */
  void go() {
    if(!myAlreadyStarted) {
      myAlreadyStarted = true;
      start();
    } else {
      myShouldPause = !myShouldPause;
    }
  }

  /**
   * pause the game.
   */
  void pause() {
    myShouldPause = true;
  }

  /**
   * stops the game.
   */
  static void requestStop() {
    myShouldStop = true;
  }

  /**
   * start the game..
   */
  public void run() {
    // flush any keystrokes that occurred before the 
    // game started:
    myJumpCanvas.flushKeys();
    myShouldStop = false;
    myShouldPause = false;
    while(true) {
      if(myShouldStop) {
	break;
      }
      if(!myShouldPause) {
	myJumpCanvas.checkKeys();
	myJumpCanvas.advance();
      }
    }
  }

}