// This class defines a blueprint for Point objects.
// Points have an x and y value and have methods for
// translating, finding the distance to the origin and
// converting to Strings.
public class Point {
   //fields: data / information
   // every Point object will have an x and y value
   
   int x;
   int y;
   
   //Constructors: These are called when a client
   // makes a new Point() call
   
   // constructor that takes an x and y parameter
   public Point(int newX, int newY){
      //Note that the passed in parameters were named differently 
      // from the fields so Java wouldn't get confused. "x" is short
      // for "this.x".
      x = newX;
      y = newY;
   }
   
   // constructor that doesn't take any parameters
   // but just sets the default values
   public Point(){
      this.x = 0;
      this.y = 0;
   }
   
   //instance methods: behavoir / actions
   // every Point object can perform these methods
   
   // Translates this point by the given dx and dy
   public void translate(int dx, int dy) {
      // "this" refers to the object that translate was called on
      this.x += dx;
      this.y += dy;
   }
   
   // Returns this Point's distance from origin
   public double distanceFromOrigin() {
      // Note that in this case, "x" is just shorthand for "this.x"
      return Math.sqrt(x * x + y * y);
   }
   
   // Returns the String representation of this Point.
   // Since this is "public String toString()" Java will
   // use it whenever a Point object is used as a string.
   // Eg. p1 + "", or System.out.println(p1)
   public String toString(){
      return this.x + ", " + this.y;
   }
}