BusCritter.java

/* 
 * AP(r) Computer Science GridWorld Case Study:
 * Copyright(c) 2005-2006 Cay S. Horstmann (http://horstmann.com)
 *
 * This code is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * @author Chris Nevison
 * @author Barbara Cloud Wells
 * @author Cay Horstmann
 */

import info.gridworld.grid.Grid;
import info.gridworld.actor.Actor;
import info.gridworld.actor.Critter;
import info.gridworld.grid.Location;
import java.awt.Color;

import java.util.*;

public class BusCritter extends Critter
{
    private int moveCounter = 0;

    public void processActors(ArrayList<Actor> neighbors)
    {
        Grid<Actor> grid = getGrid();
        for (Actor a: neighbors)
        {
            if (a instanceof Note){
                if (a.getLocation() != this.getLocation().getAdjacentLocation(this.getDirection()) || a.getLocation() != this.getLocation().getAdjacentLocation(this.getDirection() - 180))
                    grid.remove(a.getLocation());
            }
        }
    }

    /**
     * Turns towards the new location as it moves.
     */
    public void makeMove(Location loc)
    {
        setDirection(getLocation().getDirectionToward(loc));
        super.makeMove(loc);
        moveCounter++;
        dropSmiley();
    }

    public void dropSmiley()
    {
        Grid<Actor> gr = getGrid();
        Location loc = new Location(getLocation().getRow() - 1, getLocation().getCol());

        Smiley smiley = new Smiley();
        if(moveCounter % 3 == 0){
            if (gr.isValid(loc)){
                smiley.putSelfInGrid(gr, loc);
            }
        }
    }
}

BusRunner.java

/* 
 * AP(r) Computer Science GridWorld Case Study:
 * Copyright(c) 2005-2006 Cay S. Horstmann (http://horstmann.com)
 *
 * This code is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * @author Chris Nevison
 * @author Barbara Cloud Wells
 * @author Cay Horstmann
 */

import info.gridworld.actor.ActorWorld;
import info.gridworld.actor.Actor;
import info.gridworld.grid.Location;

import java.awt.Color;

/**
 * This class runs a world that contains chameleon critters. <br />
 * This class is not tested on the AP CS A and AB exams.
 */
public class BusRunner
{
    public static void main(String[] args)
    {
        ActorWorld world = new ActorWorld();
        world.add(new Location(7, 8), new BusCritter());
        world.add(new Location(3, 3), new Smiley());
        world.add(new Location(5, 4), new Note());
        world.show();
    }
}

Note.java

/**
 * Write a description of class Smiley here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */

import info.gridworld.actor.Actor;
import info.gridworld.actor.Critter;
import info.gridworld.grid.Location;
import info.gridworld.grid.Grid;

import java.awt.Color;

import java.util.ArrayList;

public class Note extends Actor
{
    public void act()
    {
        
    }
}

Smiley.java

/**
 * Write a description of class Smiley here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */

import info.gridworld.actor.Actor;
import info.gridworld.actor.Critter;
import info.gridworld.grid.Location;
import info.gridworld.grid.Grid;

import java.awt.Color;

import java.util.ArrayList;
public class Smiley extends Actor
{
    private int actCounter = 0;

    private void lighten() 
    { 
        Color c = getColor(); 
        int red = c.getRed(); 
        int green = c.getGreen(); 
        int blue = c.getBlue(); 
        if(red < 255) 
            red = red + 30;
        if(green < 255) 
            green = green + 30; 
        if(blue < 255) 
            blue = blue + 30; 
        setColor(new Color(red, green, blue)); 
    }

    public void act()
    {
        if (actCounter > 6)
        {
            Grid<Actor> gr = getGrid();
            Location loc = getLocation();
            Note note = new Note();
            note.putSelfInGrid(gr, loc);
        }
        actCounter++;
        lighten();
    }
}