Greenfoot

Jammn3 wrote ...

2012/10/29

Wombat - alter code to show the following:

Jammn3

2012/10/29

I have to write code for an assignment in Beginner's Programming class and I am completely lost. I must do the following: In this assignment you will use the “if” conditional statement to do the following changes to the leaves-and-wombats scenario. Currently, the wombats eat as many leaves as they want. Make the wombats stop eating leaves once the attribute (variable) leavesEaten reaches the value of “5” leaves or more. I have done the following following advise given to others:

  private int direction;
    private int leavesEaten;
    private int moves;//JM

    public Wombat()
    {
        setDirection(EAST);
        leavesEaten = 0;
    }

    /**
     * Do whatever the wombat likes to to just now.
     */
    public void act()
    {
        if(foundLeaf() && leavesEaten <5)//JM don't eat more than 5 leaves 
        {
            eatLeaf();
        }
        else if(canMove()) {
            move();
        }
        else {
            turnLeft();
        }
    }

    /**
     * Check whether there is a leaf in the same cell as we are.
     */
    public boolean foundLeaf()
    {
        Actor leaf = getOneObjectAtOffset(0, 0, Leaf.class);
        if(leaf != null) {
            return true;
        }
        else {
            return false;
        }
    }
    
    /**
     * Eat a leaf.
     */
    public void eatLeaf()
    {
        Actor leaf = getOneObjectAtOffset(0, 0, Leaf.class);
        if(leaf != null) {
            // eat the leaf...
            getWorld().removeObject(leaf);
            leavesEaten = leavesEaten + 1; 
        }
    }
    
    /**
     * Move one cell forward in the current direction.
     */
    public void move()
    {
        if (!canMove()) {
            return;
        }
        switch(direction) {
            case SOUTH :
                setLocation(getX(), getY() + 1);
                break;
            case EAST :
                setLocation(getX() + 1, getY());
                break;
            case NORTH :
                setLocation(getX(), getY() - 1);
                break;
            case WEST :
                setLocation(getX() - 1, getY());
                break;
        }
    }

    /**
     * Test if we can move forward. Return true if we can, false otherwise.
     */
    public boolean canMove()
    {
        World myWorld = getWorld();
        int x = getX();
        int y = getY();
        switch(direction) {
            case SOUTH :
                y++;
                break;
            case EAST :
                x++;
                break;
            case NORTH :
                y--;
                break;
            case WEST :
                x--;
                break;
        }
        moves++;//JM
        if (moves == 24)//JM
        {
                moves = 0;//JM
                if (leavesEaten > 0)//JM
                {
                    leavesEaten--;//JM
                }
                else
                {
                    //die?//Jessica Mojica
                }
            }//Jessica Mojica
        if (x >= myWorld.getWidth() || y >= myWorld.getHeight()) {
            return false;
        }
        else if (x < 0 || y < 0) {
            return false;
        }
        return true;
    }

    /**
     * Turns towards the left.
     */
    public void turnLeft()
    {
        switch(direction) {
            case SOUTH :
                setDirection(EAST);
                break;
            case EAST :
                setDirection(NORTH);
                break;
            case NORTH :
                setDirection(WEST);
                break;
            case WEST :
                setDirection(SOUTH);
                break;
        }
    }

    /**
     * Sets the direction we're facing. The 'direction' parameter must
     * be in the range [0..3].
     */
    public void setDirection(int direction)
    {
        if ((direction >= 0) && (direction <= 3)) {
            this.direction = direction;
        }
        switch(direction) {
            case SOUTH :
                setRotation(90);
                break;
            case EAST :
                setRotation(0);
                break;
            case NORTH :
                setRotation(270);
                break;
            case WEST :
                setRotation(180);
                break;
            default :
                break;
        }
    }

    /**
     * Tell how many leaves we have eaten.
     */
    public int getLeavesEaten()
    {
        return leavesEaten;
    }
}

When I run this my wombat eats 5 leaves in the beginning, but then he does not skip the 24 steps before he eats again. I must change the wombats’ code so that each time they move, they use 1/24 of leaf energy and if the leavesEaten is less than 5 the wombat can eat more leaves. Can someone tell me what I am doing wrong?

danpost

2012/10/29

You placed the code related to the energy/leavesEaten in the wrong place. It should not go in the code where you check to see if the wombat can move; instead, it should be in the code where the wombat does move. Move lines 101 through 113 to the end of the move() method at line 77.

Jammn3

2012/10/29

I tried that and it just did not work.My wombat still does not lose energy after eating all the leaves. I am however; able to eat the first five leaves and every 24th leaf after that but I am not able to see where I would insert so that each time they move, they use 1/24 of leaf energy and if the leavesEaten is less than 5 the wombat can eat more leaves. The code I now have reads like this:

import greenfoot.*;  // (World, Actor, GreenfootImage, and Greenfoot)

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

/**
 * Wombat. A Wombat moves forward until it can't do so anymore, at
 * which point it turns left. If a wombat finds a leaf, it eats it.
 * 
 * @author Michael Kolling
 * @version 1.0.1
 */
public class Wombat extends Actor
{
    private static final int EAST = 0;
    private static final int WEST = 1;
    private static final int NORTH = 2;
    private static final int SOUTH = 3;

    private int direction;
    private int leavesEaten;
    private int  stepsTaken;//JM counting number of steps taken
    private int moves;//JM count number of moves made

    public Wombat()
    {
        setDirection(EAST);
        leavesEaten = 0;
    }

    /**
     * Do whatever the wombat likes to to just now.
     */
    public void act()
    
    {
        if(foundLeaf() && leavesEaten <5)//JM don't eat more than 5 leaves turn
        {
            eatLeaf();
        }
        else if(canMove()) {
            move();
        }
        else {
            turnLeft();
        }

    }

    /**
     * Check whether there is a leaf in the same cell as we are.
     */
    public boolean foundLeaf()
    {
        Actor leaf = getOneObjectAtOffset(0, 0, Leaf.class);
        if(leaf != null) {
            return true;
        }
        else {
            return false;
        }
    }
    
    /**
     * Eat a leaf.
     */
    public void eatLeaf()
    {
        Actor leaf = getOneObjectAtOffset(0, 0, Leaf.class);
        if(leaf != null) {
            // eat the leaf...
            getWorld().removeObject(leaf);
            leavesEaten = leavesEaten + 1; 
        }
    }
    
    /**
     * Move one cell forward in the current direction.
     */
    public void move()
    {
        if (!canMove()) {
            return;
        }
        switch(direction) {
            case SOUTH :
                setLocation(getX(), getY() + 1);
                break;
            case EAST :
                setLocation(getX() + 1, getY());
                break;
            case NORTH :
                setLocation(getX(), getY() - 1);
                break;
            case WEST :
                setLocation(getX() - 1, getY());
                break;
        }
        
        {
            moves++;
        if (moves >= 24)//JM eat 1 leaf for every 24 moves
        {
                moves = 0;
                leavesEaten--;
        }
    }                   
    }

    /**
     * Test if we can move forward. Return true if we can, false otherwise.
     */
    public boolean canMove()
    {
        World myWorld = getWorld();
        int x = getX();
        int y = getY();
        switch(direction) {
            case SOUTH :
                y++;
                break;
            case EAST :
                x++;
                break;
            case NORTH :
                y--;
                break;
            case WEST :
                x--;
                break;
        }
      
        if (x >= myWorld.getWidth() || y >= myWorld.getHeight()) {
            return false;
        }
        else if (x < 0 || y < 0) {
            return false;
        }
        return true;
    }

    /**
     * Turns towards the left.
     */
    public void turnLeft()
    {
        switch(direction) {
            case SOUTH :
                setDirection(EAST);
                break;
            case EAST :
                setDirection(NORTH);
                break;
            case NORTH :
                setDirection(WEST);
                break;
            case WEST :
                setDirection(SOUTH);
                break;
        }
    }

    /**
     * Sets the direction we're facing. The 'direction' parameter must
     * be in the range [0..3].
     */
    public void setDirection(int direction)
    {
        if ((direction >= 0) && (direction <= 3)) {
            this.direction = direction;
        }
        switch(direction) {
            case SOUTH :
                setRotation(90);
                break;
            case EAST :
                setRotation(0);
                break;
            case NORTH :
                setRotation(270);
                break;
            case WEST :
                setRotation(180);
                break;
            default :
                break;
        }
    }

    /**
     * Tell how many leaves we have eaten.
     */
    public int getLeavesEaten()
    {
        return leavesEaten;
    }
}

bharris0812

2013/2/19

@Jammn3...Did you ever find out how to make wombat lose energy??

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Wombat - alter code to show the following: