import greenfoot.*;

public class shell extends Animal
{
    double realX, realY;
    
    public void addedToWorld(World world)
    {
        realX = (double) getX();
        realY = (double) getY();
    }
    
    public void act() 
    {
        move();       
    } 

    public void fall()
    {
        int r=Greenfoot.getRandomNumber(60);
        setRotation(60+r);
    }
    
    public void move()
    {
        realX += Math.cos(getRotation() * Math.PI / 180);
        realY += Math.sin(getRotation() * Math.PI / 180);
        setLocation((int) Math.round(realX), (int) Math.round(realY));
    }
}

import greenfoot.*;     
public class shell extends Animal  
{
    int gravity=1;
    int vSpeed=5;
    int i=0;
    public void act()
    {
        turn(20);
        eject();
        if(atWorldEdge()){getWorld().removeObject(this);}
    }
    public void eject()
    {
        setLocation(getX(),getY()-vSpeed);
        timer(2);
    }
    public void timer(int time)  
    {  
        i++;  
        if(i==time)  
        vSpeed-=gravity;  
        if(i==time+1)  
        i=0;  
    }
}