// CSE 142, Autumn 2010, Marty Stepp
// This class defines a new type of objects named Point.
// Each Point object represents one (x, y) location.
// Today's version adds a constructor and some new methods.

import java.awt.*;  // for Graphics

public class Point {
    int x;    // each Point object has its own copy
    int y;    // of each of these variables  (fields)
    
    // constructor - Initializes new objects as they are created.
    // Example call: Point p = new Point(3, 5);
    public Point(int startX, int startY) {
        x = startX;
        y = startY;
    }   
    
    // Returns the distance between this point and the origin, (0, 0).
    // Example call: p1.distanceFromOrigin()
    public double distanceFromOrigin() {
        return Math.sqrt(x*x + y*y);
    }
    
    // Returns the distance between this point and the given other point.
    // Example call: p1.distance(p2)
    // We pass just 1 point parameter, not 2, because the other point
    //  is "this" point, the implicit parameter, the object you called the method on.
    public double distance(Point other) {
        int dx = other.x - x;
        int dy = other.y - y;
        return Math.sqrt(dx*dx + dy*dy);
    }
    
    // EACH Point object gets its own copy of the method,
    // the method knows which object you called it on,
    // and it can directly access the data (fields) in that object by name.
    // This method draws this point using the given graphics pen.
    public void draw(Graphics g) {
        g.fillOval(x, y, 3, 3);
        g.drawString("(" + x + ", " + y + ")", x, y);
    }

    // This method returns a String representation of this point,
    // such as "(3, -4)", so that Points can be printed.
    public String toString() {
        return "(" + x + ", " + y + ")";
    }
}