J2ME游戏开发之精灵旋转

package com.slinw.sprite;

import java.io.IOException;

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

import com.slinw.gamecanvas.RootGameCanvas;
import com.slinw.graphics.ImageCanvas;
import com.slinw.unit.Logs;

/**
 * 
 * @author 章伟
 * 要实现精灵的变换最重要的一个概念为：参考像素点(reference pixel)
 *         参考像素点通过指定其在 Sprite未经变换的帧内的某一点来定义，使用 defineReferencePixel(x,y)方法。缺省的，参考像素点定义在帧的(0,0)像素点
 * 我们拿旋转来举例：参考像素点既是我们旋转的圆点
 * 
 * 
 *
 */
public class SpriteRorateAnim extends RootGameCanvas{

    private Image image = null;
    
    private Sprite sprite = null;
    private int left = 10;
    private int top = 10;
    private int[] kFrameLookup;  
    private int[] kFrameTranslateLookup;
    private int mCount = 0;
    private int mDirection = 0;
    
    public SpriteRorateAnim(){
        
        initData();
            
    }
    
    public void initData() {
        // TODO Auto-generated method stub

        image = ImageCanvas.getImage("/tank01.png");
        
        sprite = new Sprite(image,57,58);
        
        kFrameLookup = new int[]{0,1,2,
                0,1,2,
                0,1,2,
                0,1,2};  //12帧
        
        kFrameTranslateLookup = new int[]{
                Sprite.TRANS_NONE,Sprite.TRANS_NONE,Sprite.TRANS_NONE,
                Sprite.TRANS_ROT90,Sprite.TRANS_ROT90,Sprite.TRANS_ROT90,
                Sprite.TRANS_ROT180,Sprite.TRANS_ROT180,Sprite.TRANS_ROT180,
                Sprite.TRANS_ROT270,Sprite.TRANS_ROT270,Sprite.TRANS_ROT270,
        };
        
    }
    

    public void drawScreen(Graphics g) {
        // TODO Auto-generated method stub
        g.drawImage(image, left, top, Graphics.LEFT | Graphics.TOP);
        
//        sprite.setPosition(100,300);    
        mCount ++ ;
        mDirection = mCount % 12;
        

        sprite.setFrame(kFrameLookup[mDirection]);
        sprite.setTransform(kFrameTranslateLookup[mDirection]);    
        
                
        sprite.setPosition(100,300);   //记住要先变换以后在设置图像的位置
    
        
        sprite.paint(g);  
        flushGraphics();
        
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
       
        
        
    }

    public void keyLeftPressedEvent() {
        // TODO Auto-generated method stub
        
    }

    public void keyRightPressedEvent() {
        // TODO Auto-generated method stub
        
    }

    public void keyUpPressedEvent() {
        // TODO Auto-generated method stub
        
    }

    public void keyDownPressedEvent() {
        // TODO Auto-generated method stub
        
    }



}