mycanvas.java

Game_Anim_Java_MIDP_v1_0.zip详细的介绍了midp1.0中动画的制作

package example;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Sensible Development Ltd</p>
 * @author Alan Newman
 * @version 1.0
 */

import javax.microedition.lcdui.*;

public class MyCanvas extends Canvas implements Runnable, CommandListener
{
  private ExampleMidlet midlet;
  private volatile Thread animationThread=null;

  private static int canvasHeight, canvasWidth;
  private final MyMovingObject myMovingObject;
  private final MyBackground myBackground;

  private Image buffer;
  private Graphics graphics;

  private boolean running;
  private final int SLEEP=10;

  private Command exit;
  private Command memory;

  public MyCanvas(ExampleMidlet midlet)
  {
    this.midlet=midlet;
    canvasHeight=getHeight();
    canvasWidth=getWidth();

    myMovingObject=new MyMovingObject();
    myBackground=new MyBackground();

    buffer=Image.createImage(canvasWidth, canvasHeight);
    graphics=buffer.getGraphics();

    exit=new Command("Exit", Command.STOP,1);
    memory=new Command("Memory", Command.SCREEN,1);
    this.addCommand(exit);
    this.addCommand(memory);
    this.setCommandListener(this);
  }

  public static int getCanvasHeight() {return canvasHeight;}
  public static int getCanvasWidth() {return canvasWidth;}

  synchronized void start()
  {
    running=true;
    animationThread=new Thread(this);
    animationThread.start();

  }
  public void run()
  {
    try
    {
      while (running)
      {
        repaint(0,0,canvasWidth, canvasHeight);
        serviceRepaints();
        Thread.sleep(SLEEP);
      }
    }
    catch(InterruptedException ie)
    {
      System.out.println(ie.toString());
    }
  }

  synchronized void stop()
  {
    running=false;
  }

  public void paint (Graphics g)
  {
    drawAnimation(g);
  }

  private void drawAnimation(Graphics gr)
  {
    Graphics g=gr;
    if(this.isDoubleBuffered())
    {
      g=graphics;
    }

    try
    {
      myBackground.draw(g);
      myBackground.setPosition();
      myMovingObject.setFrame();
      myMovingObject.draw(g);
      gr.drawImage(buffer,0,0,g.TOP|g.LEFT);

    }
    catch(Exception e)
    {
      System.out.println("drawAnimation Error: "+e.toString());
    }
  }

  public void commandAction(Command c, Displayable d)
  {
    //if any Exit key is pressed then exit
    if(c==exit)
    {
      midlet.exitMidlet();
    }
    else if(c==memory)
    {
      System.out.println("Free memory: "+Runtime.getRuntime().freeMemory());
    }
  }
}