/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-04-15
 * Description: This is the abstract Shape class.
 */

public abstract class Shape {
	/*
	 * Store the position of the central point of the shape.
	 */
	private double x;
	private double y;

	/**
	 * Constructor of the Shape class.
	 *
	 * @param x the x-coordinate of the central point of the shape.
	 * @param y the y-coordinate of the central point of the shape.
	 */
	public Shape(double x, double y) {
		this.x = x;
		this.y = y;
	}

	/**
	 * Getter of the x coordinate of the central point of the shape.
	 *
	 * @return the x coordinate of the central point of the shape.
	 */
	public double getX() {
		return x;
	}

	/**
	 * Getter of the y coordinate of the central point of the shape.
	 *
	 * @return the y coordinate of the central point of the shape.
	 */
	public double getY() {
		return y;
	}

	/**
	 * Move the central point of the shape by amounts dx and dy.
	 *
	 * @param dx the amount of movement in x direction.
	 * @param dy the amount of movement in y direction.
	 */
	public void move(double dx, double dy) {
		x += dx;
		y += dy;
	}

	/**
	 * Abstract method to calculate the area of the shape.
	 *
	 * @return the area of the shape.
	 */
	public abstract double area();

	/**
	 * Abstract method to resize the shape.
	 *
	 * @param newSize the new size of the shape.
	 * @throws CannotResizeException
	 */
	public abstract void resize(double newSize) throws CannotResizeException;

	/**
	 * Test.
	 */
	public static void testShape() {
		Shape s = new Shape(3.9, 4.2) {
			@Override
			public double area() {
				return 0;
			}

			@Override
			public void resize(double newSize) {
			}
		};
		System.out.println(s.getX() == 3.9);
		System.out.println(s.getY() == 4.2);
		s.move(1.0, 2.0);
		System.out.println(s.getX() == 4.9);
		System.out.println(s.getY() == 6.2);
	}
}