practice3/Square.php

<?php
/**
 * Created by PhpStorm.
 * User: mrs
 * Date: 28.12.2017
 * Time: 11:06
 */

require_once('InterfacePerimeter.php');
require_once('AbstractArea.php');

class Square extends Area implements Perimeter
{
    public $diagonalLength;
    public $segmentLength;
    public $perimeter;
    public $area;

    public function __construct(float $diagonalLength)
    {
        $this->diagonalLength = $diagonalLength;
    }

    public function getSegmentLength(): float
    {
        $this->segmentLength = ($this->diagonalLength) / sqrt(2);

        return $this->getSegmentLength();

    }

    public function printSegmentLength(): void
    {
        if (empty($this->segmentLength)) {
            $this->getSegmentLength();
        }
        echo "Длина стороны квадрата равна " . $this->segmentLength;
    }

    public function getArea(): float
    {
        $this->area = ($this->segmentLength) ** 2;

        return $this->getArea();
    }

    public function printArea(): void
    {
        if (empty($this->area)) {
            $this->getArea();
        }
        echo "Площадь квадрата равна " . $this->area;
    }

    public function getPerimeter(): float
    {
        $this->perimeter = 4 * ($this->segmentLength);

        return $this->getPerimeter();
    }

    public function printPerimeter(): void
    {
        if (empty($this->perimeter)) {
            $this->getPerimeter();
        }
        echo "Периметр квадрата равен " . $this->perimeter;
    }
}