mysprite.java

SymbianOS J2ME一书的源码

/*
 * Copyright 2003, 2004 Symbian Ltd.
 * For License terms see http://www.symbian.com/developer/techlib/codelicense.html
 */

import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.Sprite;

public class MySprite extends Sprite {
    protected final int SLEEP=1000;
    
    protected static final int RAW_FRAMES=13;
    protected static final int HELLOWORLD_FRAME=12;
    protected static final int SYMBIAN_FRAME=0;
    
    protected boolean direction=false;
    
    public MySprite(Image image, int width, int height) {
        super(image,width,height);
    }
    
    public void backwards() {
        this.getDirection();
        this.prevFrame();
    }
    public void tick() {
        this.getDirection();
        if(direction) {
            this.nextFrame();
        }
        else {
            this.prevFrame();
        }
    }
    public void getDirection() {
        if (this.getFrame() == SYMBIAN_FRAME | this.getFrame()== HELLOWORLD_FRAME) {
            getDelay();
            if(direction) {
                direction=false;
            }
            else {
                direction=true;
            }
        }
    }
    
    private void getDelay() {
        try {
            Thread.sleep(SLEEP);
        }
        catch(InterruptedException ie) {
            System.out.println(ie.toString());
        }
        
    }
}