// Marty Stepp, CSE 142, Autumn 2009
// This file defines a new type of objects named Point.
//
// This second version of the class adds methods to each object.
//
// Keep in mind that each method's code is copied into each Point,
// and the code runs inside that Point object.
// Think of the method as having an identity; it knows which object
// it was called on and can access that object's x/y fields directly.

import java.awt.*;   // for Graphics

public class Point {
    int x;    // each Point object has an int x and y in it
    int y;
    
    // Draws this point onto the given drawing window.
    public void draw(Graphics g) {
        g.fillOval(x, y, 3, 3);
        g.drawString("(" + x + ", " + y + ")", x, y);
    }

    // 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;
    }
    
    // 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
    }
}