package ex1_4;

/**
 * Title:       Robot class
 * Description: Simple robot class
 *              Models a robot which can move around on a 2-D grid
 *
 *              This class is complete and you should not need to change it
 * Copyright:   Copyright (c) 2004 - 2006
 * Company:     The Open University
 * @author      M257 Course Team
 * @version     1.0
 */

public class Robot
{
    // Instance variables
    // We have declared these variables as protected rather than private.
    // This allows x and y to be accessed by subclasses of Robot.
    // This is all you need to know about "protected" access at present.
    // Access modifiers are explained in detail in Unit 3.
    
    private int x; // x-position(W-E) of robot
    private int y; // y-position(N-S) of robot
    
    // Constructors
    public Robot()
    {
        x = 1;
        y = 1;
    }
    
    public Robot(int xPos, int yPos)
    {
        x = xPos;
        y = yPos;
    }
    
    // Methods
    public void moveNorth()
    {
        y = y + 1;
    }
    
    public void moveSouth()
    {
        y = y - 1;
    }
    
    public void moveEast()
    {
        x = x + 1;
    }
    
    public void moveWest()
    {
        x = x - 1;
    }
    
    public void setX(int xPos)
    {
        x = xPos;
    }
    
    public void setY(int yPos)
    {
        y = yPos;
    }
    
    public int getX()
    {
        return x;
    }
    
    public int getY()
    {
        return y;
    }
    
    public void moveTo(int xPos, int yPos)
    {
        x = xPos;
        y = yPos;
    }
    
    // Returns a character string indicating the current position,
    // formatted as (x,y)
    // This is an extra method, not mentioned in the course text, but
    // added here for convenience in displaying the robot's position
    // At this stage, you do not need to understand in detail how it works
    public String getPosition()
    {
        return ("(" + x + ", " + y + ")");
    }
    
} // end of class