/*
CSE 142, Autumn 2007, Marty Stepp

This file defines a new class of objects called Point.
Each Point object contains two ints named x and y, as well as 
its own copy of each method and constructor written below.
*/
public class Point {
    // fields: the data inside of each object
    int x;
    int y;
    
    // constructor: initializes each object when 'new' is used in client
    // This constructor initializes the new Point object to use the given x/y values.
    public Point(int initialX, int initialY) {
        x = initialX;
        y = initialY;
    }
    
    // methods: the behavior inside of each object
    // Each of these methods executes "inside" a particular Point object,
    // so it knows about and can refer to that object's fields directly by name.
    
    // Returns the distance between this Point object and the given Point p2.
    public double distance(Point p2) {
        int dx = x - p2.x;
        int dy = y - p2.y;
        return Math.sqrt(dx * dx + dy * dy);
    }
    
    // Returns the distance between this Point object and the origin, (0, 0).
    public double distanceFromOrigin() {
        Point origin = new Point(0, 0);       // (0, 0)
        return distance(origin);
    }
    
    // Changes this Point object's (x, y) location to the given coordinates.
    public void setLocation(int newX, int newY) {
        x = newX;
        y = newY;
    }
    
    // Shifts this Point object's (x, y) location by the given amounts.
    public void translate(int dx, int dy) {
        setLocation(x + dx, y + dy);
    }
}