// Helene Martin, CSE 142
// Blueprint for creating objects of type Point

public class Point {
	// fields (state)
	int x; // each Point object has own x and y
	int y; 
	
	// constructors don't have explicit return types
	// and have the same name as the class.  They get
	// called when a client creates a new object of 
	// this type using the new keyword.
	public Point(int initialX, int initialY) {
		System.out.println("Building point: " + initialX + ", " + initialY);
		x = initialX;
		y = initialY;
	}
	
	// a class can have multiple constructors.
	public Point() {
		x = 0;
		y = 0;
		// also: this(0,0);
	}
	
	// moves x and y coordinates of a particular point.
	// mutator - changes state (generally void; generally has parameters)
	public void translate(int dx, int dy) {
		x += dx;  // x is interpreted as this.x where 'this'  
		y += dy;	 // is the implicit parameter (object 'translate' is called on)
	}
	
	// calculates and returns the distance from this point to (0, 0)
	// accessor - return something based on object's state
	public double distanceFromOrigin() {
		return Math.sqrt(x * x + y * y);
	}
	
	// sets the point's location to the specified x and y coordinates
	// mutator
	public void setLocation(int newX, int newY) {
		x = newX; // assign to fields (on left)
		y = newY;
	}
	
	/* Another way to avoid shadowing:
	
		public void setLocation(int x, int y) {
		this.x = x; // assign to fields (on left)
		this.y = y;
	}
	*/
	
	// returns a String representation of this point in the form (x, y)
	// (called by println)
	public String toString() {
		return "(" + x + ", " + y + ")";
	}
}