mygamewithinputcanvas.java

J2me游戏精灵

import javax.microedition.lcdui.* ;
import javax.microedition.lcdui.game.* ;

public class MyGameWithInputCanvas extends GameCanvas
implements Runnable
{
        public MyGameWithInputCanvas()
        {
                super(true) ;
        }
        boolean conti = true ;
        int rate = 50 ;
        public void run()
        {
                long st = 0 ;
                long et = 0 ;
                Graphics g = getGraphics() ;
                while(conti)
                {
                        st = System.currentTimeMillis() ;
                        input() ;
                        render(g) ;
                        et = System.currentTimeMillis() ;
                        if((et-st)<rate)
                        {
                                try
                                {
                                        Thread.sleep(rate-(et-st));
                                }catch(Exception exp){}
                        }
                }
        }
        int x = 50 ;
        int y = 10 ;
        public void input()
        {
                int keystate = getKeyStates() ;
                if((keystate & UP_PRESSED)!=0)
                {
                        y = y - 2 ;
                }else if((keystate & DOWN_PRESSED)!=0)
                {
                        y = y + 2 ;
                }

        }
        public void render(Graphics g)
        {
                g.setColor(255,255,255);
                g.fillRect(0,0,getWidth(),getHeight());
                g.setColor(0,0,0);
                g.drawString("Test",x,y,0);
                x++ ;
                if(x > getWidth())
                        x = 0 ;
                flushGraphics() ;
        }
        public void start()
        {
                Thread t = new Thread(this) ;
                t.start();
        }
        public void exit()
        {
                conti = false ;
        }
        public void keyPressed(int keycode)
        {
                System.out.println("按键事件");
        }
}