// Allison Obourn
// CSE 143 - lecture 13
// Points represent positions in 2D space.
// demonstrates using the Comparable<E> interface and implementing a compareTo method

public class Point implements Comparable<Point> {
   private int x;
   private int y;
   
   // compares this point to another first using the x value
   // and then using the y value. Returns a negative number if this point
   // has a smaller x (or smaller y if the xs are equal), a positive number 
   // if this point has a bigger x (or bigger y if the xs are equal) and
   // 0 otherwise.
   public int compareTo(Point other) {
      if(x != other.x) {
         return x - other.x;
      } else {
         return y - other.y; // same x; break ties with y.
      }
   }

   // Create a Point a the given position.
   public Point(int initialX, int initialY) {
      x = initialX;
      y = initialY;
   }

   // Create a Point representing the origin.
   public Point() {
      x = 0;
      y = 0;
   }

   // setters
   public void setX(int newX) {
      if (newX > 0) {
         x = newX;
      }
   }

   // Moves x and y coordinates of this point by specified amounts
   public void translate(int dx, int dy) {
      x += dx;
      y += dy;
   }

   // Changes the location of this Point.
   public void setLocation(int newX, int newY) {
      x = newX;
      y = newY;
   }

   // Returns this point's x coordinate.
   public int getX() {
      return x;
   }

   // Returns this point's y coordinate.
   public int getY() {
      return y;
   }

   // Returns the distance of this Point from the origin.
   public double distanceFromOrigin() {
      return Math.sqrt(x * x + y * y);
   }

   // Returns the distance between this Point and another Point.
   public double distance(Point other) {
      int dx = x - other.x;
      int dy = y - other.y;
      return Math.sqrt(dx * dx + dy * dy);
   }

   // Returns this Point's coordinates surrounded by parentheses
   // and separated by a comma.
   public String toString() {
      return "(" + x + ", " + y + ")";
   }
}