/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022/03/27
 * Description: This is the Shape class.
 */

public class Shape {
	private double x;
	private double y;

	/**
	 * Constructor
	 *
	 * @param x the position of the center point of the shape
	 * @param y the position of the center point of the shape
	 */
	public Shape(double x, double y) {
		this.x = x;
		this.y = y;
	}

	/**
	 * Getter of x
	 *
	 * @return the position of the center point of the shape
	 */
	public double getX() {
		return x;
	}

	/**
	 * Getter of y
	 *
	 * @return the position of the center point of the shape
	 */
	public double getY() {
		return y;
	}

	/**
	 * The are of the shape
	 *
	 * @return the area of the shape
	 */
	public double area() {
		System.out.println("An unknown shape has an unknown area!");
		return -1.0;
	}

	/**
	 * toString method
	 */
	public String toString() {
		return this.getClass().getName() + " has area " + area();
	}

	/**
	 * Test
	 */
	public static void testShape() {
		Shape s = new Shape(1.0, 2.0);
		System.out.println(s.getX() == 1.0);
		System.out.println(s.getY() == 2.0);
		System.out.println(s.area() == -1.0);
	}
}