mygamewithcollicanvas.java

同样是用j2me写的

import javax.microedition.lcdui.* ;
import javax.microedition.lcdui.game.* ;
public class MyGameWithColliCanvas extends GameCanvas
implements Runnable
{
        private LayerManager lm;
        private TankCanFireSprite c1 ;
        private BadSprite bad ;
		public static int Score = 10;
		

        public MyGameWithColliCanvas()
        {
                super(true) ;
                lm = new LayerManager();
                c1 = createTank("/pic/tank.png") ;
                c1.setPosition(80,100);
                lm.append(c1);
                bad = createBad("/pic/bad.png") ;
                bad.setPosition(20,0);
                lm.append(bad);


        }
        private TankCanFireSprite createTank(String pic)
        {
                Image img = null ;
                try
                {
                        img = Image.createImage(pic);
                }catch(Exception exp)
                {
                        System.out.println(exp);
                }
                return new TankCanFireSprite(img,32,32,128,128)  ;
        }
        private BadSprite createBad(String pic)
        {
                Image img = null ;
                try
                {
                        img = Image.createImage(pic);
                }catch(Exception exp)
                {
                        System.out.println(exp);
                }
                return new BadSprite(img,64,64,128,128)  ;
        }
        boolean conti = true ;
        int rate = 100 ;
        public void run()
        {
                long st = 0 ;
                long et = 0 ;
                Graphics g = getGraphics() ;
                while(conti&&Score!=0)
                {
                        st = System.currentTimeMillis() ;
                        input() ;
                        bad.AI();
                        if(collidect())
                        {
                                render(g) ;
                                break ;
                        }
                        render(g) ;
                        et = System.currentTimeMillis() ;
                        if((et-st)<rate)
                        {
                                try
                                {
                                        Thread.sleep(rate-(et-st));
                                }catch(Exception exp){}
                        }
                }
				if(Score == 0)
					render(g);

        }
        public boolean collidect()
        {
                if(bad.collidesWith(c1,false))
                {
                        Image good = null ;
                        try
                        {
                                good = Image.createImage("/pic/good.png") ;
								Score = Score - 2;
                        }catch(Exception exp){}
                        bad.setImage(good,64,64);
                }
                return bad.collidesWith(c1,false) ;
        }
        public void input()
        {
                int keystate = getKeyStates() ;
                if((keystate & UP_PRESSED)!=0)
                {
                        c1.moveUp() ;
                }if((keystate & DOWN_PRESSED)!=0)
                {
                        c1.moveDown();
                }if((keystate & LEFT_PRESSED)!=0)
                {
                        c1.moveLeft();

                }if((keystate & RIGHT_PRESSED)!=0)
                {
                        c1.moveRight();
                }
        }
        public void render(Graphics g)
        {
			if(Score!=0)
			{
                g.setColor(255,255,255);
                g.fillRect(0,0,getWidth(),getHeight());

                lm.paint(g,10,10);

                g.setColor(0,0,0); 
                g.drawRect(10,10,128,128);
				g.drawString("Score : "+Score,10,160,20);
				flushGraphics() ;
			}
			else
			{
				g.setColor(255,255,255);
                g.fillRect(0,0,getWidth(),getHeight());

                lm.paint(g,10,10);

                g.setColor(0,0,0); 
                g.drawRect(10,10,128,128);
				g.drawString("Game Over! ",10,160,20);
				flushGraphics() ;

			}

        }
        public void start()
        {
                Thread t = new Thread(this) ;
                t.start();
        }
        public void exit()
        {
                conti = false ;
        }
}