import greenfoot.*;

/**
 * This class defines a crab. Crabs live on the beach.
 */
public class Crab extends Actor
{
    GreenfootImage image1 = new GreenfootImage("crab.png");
    GreenfootImage image2 = new GreenfootImage("crab2.png");
    int count = 0;
    public Crab(){
        setImage(image1);
    }
    public void act()
    {
        keyControl();
        atEdge();
        eat();
        move(2);
        siwtchImage();
    }
    public void siwtchImage() {
        if (getImage() == image1){
            setImage(image2);
    } else {
            setImage(image1);
    }
    }
    public void keyControl(){
        int d = Greenfoot.getRandomNumber(10);
        if (Greenfoot.isKeyDown("left")){
            turn(-d);
            move(2);
        }
        if (Greenfoot.isKeyDown("right")){
            turn(d);
            move(2);
        }
    }
    public void atEdge(){
     int d = Greenfoot.getRandomNumber(30);
     if (isAtEdge()){
          turn(d-15);
       }
     }
    public void eat(){
        if (isTouching(Worm.class)){
            Greenfoot.playSound("slurp.wav");
            removeTouching(Worm.class);
            count++;
            
            World w = getWorld();
            GreenfootImage bj = w.getBackground();
            Font font = bj.getFont();
            font = font.deriveFont(100);
            bj.setFont(font);
            bj.setColor(Color.GREEN);
            w.showText("吃虫数："+ count ,50,40);
            
            
          
            if (count == 5 ) {
                bj.drawString("成功!",170,280);
                Greenfoot.stop();            
            }
        }
        }// Add your action code here
    }