import greenfoot.*;
public class Crab extends Actor
{
    static int cnt = 0;  
    GreenfootImage image1= new GreenfootImage("crab.png");
    GreenfootImage image2= new GreenfootImage("crab2.png");
    public Crab()
    {
        setImage(image1);
    }
    public void act()
    {
        move(5);
        keyControl();
        eat();
        switchImage();
    }
    public void switchImage()
    {
        if(getImage()==image1){
            setImage(image2);
        }
        else{
            setImage(image1);
        }
    }
    public void keyControl()
    {
        if(Greenfoot.isKeyDown("left"))
        {
            turn(-5);
        }
        if(Greenfoot.isKeyDown("right"))
        {
            turn(5);
        }
        if(Greenfoot.isKeyDown("up"))
        {
            move(10);
        }
        if(Greenfoot.isKeyDown("down"))
        {
            move(5);
        }
    }
    public void eat()
    {
        if (isTouching(Worm.class)){
           removeTouching(Worm.class);
           Greenfoot.playSound("slurp.wav");
           cnt++;
           CrabWorld w = (CrabWorld)getWorld();
           w.showScore(cnt);
           //w.showText("吃虫数： "+ cnt, 50 , 30);
        }
        if (cnt == 3){   
           World w = getWorld();
           GreenfootImage bg = w.getBackground();
           bg.setFont(new Font(true,true,100));
           bg.setColor(new Color(0,255,0));
           bg.drawString("成功！",200,200);
           cnt = 0;
           Greenfoot.stop();
        }   
    }
}