// CSE 142, Summer 2008 (Marty Stepp)
// This file defines a new type of objects named Point.
//
// Today's version has the following new features:
// - more methods (distance, distanceFromOrigin, ...)
// - a constructor, so we can say  new Point(3, 5)
// - a toString method, so that we can println Points
// - encapsulation (private fields), so other classes
//   can't directly change a Point's x or y value
public class Point {
	// Fields:
	// What contents should each Point object have?
	private int x;
	private int y;   // EACH Point object has an int x and int y inside it.

	// Constructor:
	// How is each Point object initialized?
	public Point(int initialX, int initialY) {
		x = initialX;
		y = initialY;
	}
	
	// Methods:
	// What behavior should each Point object have?

	// Shifts the x/y position of this Point by the given amounts.
	public void translate(int dx, int dy) {
		setX(x + dx);
		setY(y + dy);
	}
	
	// Returns the direct distance between this Point and the origin, (0, 0).
	public double distanceFromOrigin() {
		// square root of (a^2 + b^2)
		return Math.sqrt(x*x + y*y);
	}
	
	// Returns the direct distance between this Point and the given other Point.
	public double distance(Point otherPoint) {
		int a = otherPoint.x - x;   // change in x
		int b = otherPoint.y - y;   // change in y
		return Math.sqrt(a*a + b*b);
	}
	
	// Converts this Point's state into a String and returns that String.
	public String toString() {
		return "(" + x + ", " + y + ")";
	}
	
	// Returns this Point's x coordinate.
	public int getX() {
		return x;
	}
	
	// Returns this Point's y coordinate.
	public int getY() {
		return y;
	}
	
	// Sets this Point's x coordinate to the given value.
	// Does not allow negative values.
	public void setX(int value) {
		x = Math.max(0, value);
	}
	
	// Sets this Point's y coordinate to the given value.
	// Does not allow negative values.
	public void setY(int value) {
		y = Math.max(0, value);
	}
}