mycanvas.java

j2me的框架~~本人在学习中总结出来的

import javax.microedition.lcdui.*;


public class myCanvas extends Canvas implements Runnable {
	
	public Image player,bk;
	public Image offScreen;
	public Graphics offg;
	public int mx,my,px,py,nowFrame,dir,fx,fy;
	
	
	public  myCanvas(){
		
		mx=this.getWidth();
		my=this.getHeight();
		px=mx/2-11;py=my/2-12;
		fx=fy=0;
		nowFrame=7;
		dir=0;
		
		offScreen=Image.createImage(mx,my);
		offg=offScreen.getGraphics();
		
		try{
			
			
			bk=Image.createImage("/bk.png");
			player=Image.createImage("/player.png");
			
			
		}catch(Exception ex){}
		
		
		new Thread(this).start();
		
		
	}
	
	public void drawBk(){
		
		
		offg.drawImage(bk,fx,fy,0);
		offg.setClip(0,0,mx,my);
		
	}
	
	
	public void drawPlayer(){
		
		
		offg.setClip(px,py,22,24);
		
		offg.drawImage(player,px-22*(nowFrame-1),py,0);
		offg.setClip(0,0,mx,my);
		
	}
	
	public void paint(Graphics g){
		
		
		drawBk();
		drawPlayer();
		
		
		g.drawImage(offScreen, 0, 0, 0);
		
	}
	
	public void keyPressed(int keyCode){
		switch(keyCode){
		case Canvas.KEY_NUM2:dir=1;nowFrame=0;nowFrame++;break;
		case Canvas.KEY_NUM4:dir=2;nowFrame=9;nowFrame++;break;
		case Canvas.KEY_NUM6:dir=3;nowFrame=3;nowFrame++;break;
		case Canvas.KEY_NUM8:dir=4;nowFrame=6;nowFrame++;break;
		}
		
		
	}
	
	public void keyReleased(int keyCode){
		
		dir=0;
		
	}
	
	
	public void move(int k){
		
		nowFrame++;
		if(nowFrame>k+3)
		nowFrame=k+1;
		
		
	}
	
	public void run(){
		
		while(true){
		if(dir==1){
			
			move(0);
			
			if(py>0)
			py-=4;
			
		}
		
		if(dir==2){
			move(9);
			if(px>(mx-22)*1/4)
			px-=4;
			else{fx+=4;
			if(fx>0)
				{fx=0;
				if(px>0)
					px-=4;
				
				}
			}
			
		}
		if(dir==3){
			move(3);
			if(px<(mx-22)*3/4)
			{px+=4;}
			else{
				
			
		if(fx<-320+mx)
			
				{if(px<mx-22)
					px+=4;}
		else fx-=4;
		
			}
			
		}
		if(dir==4){
			move(6);
			if(py<my-46)
			py+=4;
			
		}
		repaint();
		
		try{Thread.sleep(100);}catch(Exception ex){}
		
		
	}}

}