gamethread.java

Source code for j2me game WordSearch

package wordSearch20;

/**
 * This class contains the loop that keeps the game running.
 *
 * @author Jeremiah McLeod xdebugx http://www.xdebugx.net
 */
public class GameThread extends Thread {

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

  /**
   * Whether or not this thread has been started.
   */
  boolean myAlreadyStarted;
  private long runTime,lastCPSTTime;
  int cps,cyclesThisSecond;
  final int MS_PER_FRAME=41;


  /**
   * A handle back to the graphical components.
   */
  mainCanvas myMainCanvas;

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

  /**
   * standard constructor.
   */
  GameThread(mainCanvas canvas) {
    myMainCanvas = canvas;
  }

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

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

  /**
   * pause the game.
   */
  void pause() {
  }

  /**
   * stops the game.
   */
  static void requestStop() {
  }

  /**
   * start the game..
   */
  public void run() {
   runTime=0;
	  runTime=System.currentTimeMillis();
	  lastCPSTTime=0;

   while(true) {
   runTime=System.currentTimeMillis();
   myMainCanvas.advance();



      if (System.currentTimeMillis()-lastCPSTTime>1000)
      {
		  lastCPSTTime=System.currentTimeMillis();
		  cps=cyclesThisSecond;
		 // System.out.println ("cps "+cps);
		  cyclesThisSecond=0;
	  } else
	  cyclesThisSecond++;
	  long timeSinceStart=(runTime-System.currentTimeMillis());
	  if (timeSinceStart<MS_PER_FRAME) {
	  try
	  {
		  if ((MS_PER_FRAME - timeSinceStart)-((System.currentTimeMillis()-lastCPSTTime)-(cyclesThisSecond*MS_PER_FRAME))>0) Thread.sleep((MS_PER_FRAME - timeSinceStart)-((System.currentTimeMillis()-lastCPSTTime)-(cyclesThisSecond*MS_PER_FRAME)));
	  }
	  catch (java.lang.InterruptedException e)
	  {}
  } //if

}// while


}


}