midlet6.java

这是郭克华老师的J2ME视频的源代码

package prj22_1;

import java.util.Random;

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
//让图片绕着左上角旋转
public class MIDlet6 extends MIDlet {
	private MyGameCanvas mgc = new MyGameCanvas();
	private Display dis;
	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		dis.setCurrent(mgc);

	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		

	}

	protected void pauseApp() {
		

	}
	
	class MyGameCanvas extends GameCanvas implements Runnable{
		private boolean RUN = true;
		private Random rnd = new Random();
		private Graphics gra;
		private Sprite s1;
		private Image img;
		private int STATE = Sprite.TRANS_NONE;
		public MyGameCanvas(){
			super(true);
			gra = this.getGraphics();
			try{
				img = Image.createImage("/img1.png");
			}catch(Exception ex){ex.printStackTrace();}
			s1 = new Sprite(img);			
			//定义悬挂点
			//s1.defineReferencePixel(s1.getWidth()/2,s1.getHeight()/2);//坐标是图像上的坐标
			s1.defineReferencePixel(0,0);
			s1.setRefPixelPosition(100,100);//悬挂点在界面上的坐标
			
			new Thread(this).start();
		}		
		public void run(){
			while(RUN){
				try{
					s1.setTransform(STATE);
					gra.setColor(255,255,255);
					gra.fillRect(0,0,this.getWidth(),this.getHeight());
					gra.setColor(255,0,0);
					gra.drawLine(100,100, 150,200);
					s1.paint(gra);
					this.flushGraphics();
					switch(STATE){
					case Sprite.TRANS_NONE: STATE=Sprite.TRANS_ROT90; break;
					case Sprite.TRANS_ROT90: STATE=Sprite.TRANS_ROT180; break;
					case Sprite.TRANS_ROT180: STATE=Sprite.TRANS_ROT270; break;
					case Sprite.TRANS_ROT270: STATE=Sprite.TRANS_NONE; break;
					}					
					Thread.currentThread().sleep(100);
				}catch(Exception ex){}
			}
		}

	}


}