import java.awt.Graphics;

public class Bubble extends Shape {
	private double radius;

	/**
	 * Constructor for the Bubble class.
	 *
	 * @param x the x coordinate of the center of the bubble
	 * @param y the y coordinate of the center of the bubble
	 */
	public Bubble(int x, int y) {
		super(x, y);
		this.radius = 10;
	}

	// Find the point (wx, wy) inside the window which is closest to the
	// center (x, y) of the circle. In other words, find the wx in the
	// interval [0, w - 1] which is closest to x, and find the wy in the
	// interval [0, h - 1] which is closest to y.
	// If the distance between (wx, wy) and (x, y) is less than the radius
	// of the circle (using Pythagoras's theorem) then at least part of
	// the circle is visible in the window.
	// Note: if the center of the circle is inside the window, then (wx, wy)
	// is the same as (x, y), and the distance is 0.
	@Override
	public boolean isVisible(int w, int h) {
		double x = getX();
		double y = getY();
		double wx = (x < 0 ? 0 : (x > w - 1 ? w - 1 : x));
		double wy = (y < 0 ? 0 : (y > h - 1 ? h - 1 : y));
		double dx = wx - x;
		double dy = wy - y;
		return dx * dx + dy * dy <= radius * radius;
	}

	/**
	 * Whether the point at xy is currently inside the bubble
	 *
	 * @param x the x coordinate of the point
	 * @param y the y coordinate of the point
	 * @return true if the point is inside the bubble, false otherwise
	 */
	@Override
	public boolean isIn(int x, int y) {
		double dx = x - getX();
		double dy = y - getY();
		return dx * dx + dy * dy < radius * radius;
	}

	/**
	 * Draw the bubble.
	 *
	 * @param g the graphics context
	 */
	@Override
	public void draw(Graphics g) {
		super.draw(g);
		g.drawOval(
				getX() - (int) radius,
				getY() - (int) radius,
				(int) radius * 2,
				(int) radius * 2);
	}

	public static void testBubble() {
		Bubble b = new Bubble(20, 30);

		System.out.println(b.getX() == 20);
		System.out.println(b.getY() == 30);

		b.setX(40);
		System.out.println(b.getX() == 40);
		System.out.println(b.getY() == 30);

		b.setY(60);
		System.out.println(b.getX() == 40);
		System.out.println(b.getY() == 60);
		System.out.println(b.isVisible(100, 100) == true);

		b.setX(50);
		b.setY(0);
		System.out.println(b.isVisible(100, 100) == true);

		b.setX(99);
		b.setY(50);
		System.out.println(b.isVisible(100, 100) == true);
	}
}