// Marty Stepp, CSE 142, Autumn 2009
// This file defines a new type of objects named Point.
//
// This third version of the class adds constructors, a toString method,
// and encapsulation (private data fields).

import java.awt.*;   // for Graphics

public class Point {
    // private fields (cannot be directly accessed outside this file)
    private int x;    // each Point object has an int x and y in it
    private int y;
    
    // constructor (initializes the state of a newly created Point object)
    public Point(int initialX, int initialY) {
        // setLocation(initialX, initialY);
        x = initialX;
        y = initialY;
    }
    
    // Creates a new Point at location (0, 0).
    public Point() {
        // setLocation(0, 0);
        x = 0;
        y = 0;
    }
    
    // Returns the distance between this point and the given other point p2.
    public double distance(Point p2) {
        // "I'm a Point object."
        // "The client is asking me how far away I am from p2."
        int dx = x - p2.x;
        int dy = y - p2.y;
        double dist = Math.sqrt(dx*dx + dy*dy);
        return dist;
    }
    
    // Draws this point onto the given drawing window.
    public void draw(Graphics g) {
        g.fillOval(x, y, 3, 3);
        g.drawString(toString(), x, y);
    }

    // Modifies this point to have the given x/y coordinates.
    public void setLocation(int theX, int theY) {
        x = theX;
        y = theY;
    }
    
    // Shifts this point object's x/y position by the given amounts.
    public void translate(int dx, int dy) {
        // x = x + dx;
        // y = y + dy;
        setLocation(x + dx, y + dy);   // call setLocation on this Point object
    }
    
    // Returns a String representation of this Point object.
    // This method is called automatically when a Point is printed.
    public String toString() {
        return "(" + x + ", " + y + ")";
    }
}