import greenfoot.*;

import java.util.List;
import java.util.ArrayList;




| Animal. This is the base class for all animals. In addition to the standard Actor
| methods, it provides methods to check for being at the edge of the world, as well as
| seeing and eating other classes.
|
| @author Michael Kolling
| @version 2.0
|
public class Animal
extends Actor
{    
private static final int WALKING_SPEED = 5;

    


| Move forward in the current direction.
|
public void move()
    {
        move(WALKING_SPEED);
    }

    
    


| Test if we are close to one of the edges of the world. Return true if we are.
|
public boolean atWorldEdge()
    {
        if(getX() < 20 || getX() > getWorld().getWidth() - 20)
            return true;
        if(getY() < 20 || getY() > getWorld().getHeight() - 20)
            return true;
        else
            return false;
    }
    
    
    


| Return true if we can see an object of class 'clss' right where we are.
| False if there is no such object here.
|
public boolean canSee(Class clss)
    {
        Actor actor = getOneObjectAtOffset(0, 0, clss);
        return actor != null;        
    }

    
    


| Try to eat an object of class 'clss'. This is only successful if there
| is such an object where we currently are. Otherwise this method does
| nothing.
|
public void eat(Class clss)
    {
        Actor actor = getOneObjectAtOffset(0, 0, clss);
        if(actor != null) {
            getWorld().removeObject(actor);
        }
    }
}