<?php

    interface Geometry {
         public  function getValue ();
         public  function getMass ();
    }

    class Paral  implements   Geometry {
        protected $a;
        protected $b;
        protected $c;
        protected $density;

        public function __construct($a, $b, $c, $density){
            $this->a = $a;
            $this->b = $b;
            $this->c = $c;
            $this->density = $density;
        }

        public  function getValue (){
            return $this->a * $this->b * $this->c;
        }

        public  function getMass (){
            return $this->getValue() * $this->density;
        }

        public function __toString(){
            return (string)($this->getMass());
        }
    }

    class Cube extends Paral implements Geometry  {
        public function __construct($a, $density){
            $this->a = $a;
            $this->b = $a;
            $this->c = $a;
            $this->density = $density;
        }
        public function __toString(){
            return (string) parent::__toString();
        }
    }

    class Sfera  implements Geometry {
        private $r;
        private $density;

        public function __construct($r, $density){
            $this->r = $r;
            $this->density = $density;
        }

        public  function getValue (){
            return 4/3*(3.14*$this->r*$this->r*$this->r);
        }

        public  function getMass (){
            return $this->getValue() * $this->density;

        }

        public function __toString(){
            return (string)($this->getMass());
        }

    }

    class Pyramid  implements Geometry {
        private $a;
        private $b;
        private $c;
        private $h;
        private $density;

        public function __construct($a, $b, $c, $h, $density){
            $this->a = $a;
            $this->b = $b;
            $this->c = $c;
            $this->h = $h;
            $this->density = $density;
        }

        public  function getValue (){
            $a = $this->a;
            $b = $this->b;
            $c = $this->c;
            $h = $this->h;
            $p = ($a+$b+$c)/2;
            $s = sqrt($p * ($p - $a) * ($p - $b)*($p - $c));
            return ($s*$h)/3;
        }

        public  function getMass (){
            return $this->getValue() * $this->density;
        }

        public function __toString(){
            return (string)($this->getMass());
        }
    }


$paral = new Paral(5,6,7.1,0.1);
print "Обем и масса паралелепипеда:" . "\n";
print $paral->getValue() . "\n";
print $paral->getMass() . "\n";
//print $paral;

$cube = new Cube(5,0.1);
print "Обем и масса куба:" . "\n";
print $cube->getValue() . "\n";
print $cube->getMass() . "\n";
//print $cube;

$sfera = new Sfera(3,0.1);
print "Обем и масса сферы:" . "\n";
print $sfera->getValue() . "\n";
print $sfera->getMass() . "\n";

$pyramid = new Pyramid(2, 3, 4, 7, 0.1);
print "Обем и масса пирамиды:" . "\n";
print $pyramid->getValue() . "\n";
print $pyramid->getMass() . "\n";

print "_______________________" . "\n" ;
print "Рандомный выбор фигуры: \n";
$figures = array();                                         //Рандомный выбор фигуры
$figuresMass = array();
for ($j = 0; $j < 4; $j++){
    for ($i = 0; $i < 4; $i++){
        $figures [$j][$i] = rand(0, 3);
        switch ($figures[$j][$i]) {
            case 0:
                $figures[$j][$i] =new Paral(5,6,7.1,0.1);
                $figuresMass[$j][$i] = round($figures[$j][$i]->getMass(), 1);
                break;
            case 1:
                $figures[$j][$i] = new Cube(5,0.1);
                $figuresMass[$j][$i] = round($figures[$j][$i]->getMass(), 1);
                break;
            case 2:
                $figures[$j][$i]=new Sfera(3,0.1);
                $figuresMass[$j][$i] = round($figures[$j][$i]->getMass(), 1);
                break;
            case 3:
                $figures[$j][$i]=new Pyramid(2, 3, 4, 7, 0.1);
                $figuresMass[$j][$i] = round($figures[$j][$i]->getMass(), 2);
                break;
        };
    }
}

/*$figuresMass = array(
    "0"=> array(
        "0" => 4,
        "1" => 5,
        "2" => 3,
        "3" => 2,
        ),
    "1"=>array(
        "0" => 1,
        "1" => 6,
        "2" => 2,
        "3" => 7,
    ),
    "2"=>array(
        "0" => 3,
        "1" => 3,
        "2" => 8,
        "3" => 1,
    ),
    "3"=>array(
        "0" => 2,
        "1" => 1,
        "2" => 5,
        "3" => 4,
    ),
);*/
//$figuresMass[1][0] = 0;

$oneDArray = array();
foreach ($figuresMass as $key_j => $val_j) {
    foreach ($figuresMass[$key_j] as $key_i => $val_i) {
        array_push($oneDArray, $val_i);
        echo "| " . $val_i . " ";
    }
    echo "|" ."\n";
}

print "_______________________" . "\n" ;


//Дигональная сортировка
sort($oneDArray);
$n = sizeof($figuresMass[1])-1;
$figuresMass[0][$n] = $oneDArray[0];
$i=0; $j=$n-1;
$zsuv_j = 1; $zsuv_i = 0;
for  ($k=1; $k < sizeof($oneDArray); $k++){
    if ($i < $n && $j < $n && $j > 0) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        if ($i == 0) $zsuv_j++;
        $i++; $j++;
        //echo "[$j] [$i]". "<br/>";
    }
    elseif ($i<$n && $j==$n) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        $zsuv_i++;
        $i = $i-$zsuv_i;
        $j = $j-$zsuv_j;
    }
    elseif ($i==0 && $j==0) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        $i++; $j++;
    }
    elseif ($i == $n && $j == $n) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        $i = $i-$zsuv_i;
        $j = $j-$zsuv_j;
    }
    elseif ($i < $n && $j == 0) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        $zsuv_i--;
        $i++; $j++;
    }
    elseif ($i == $n && $j < $n) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        $zsuv_j--;
        $i = $i-$zsuv_i;
        $j = $j-$zsuv_j;
    }
    elseif ($i == $n && $j == 0) {
        $figuresMass[$i][$j] = $oneDArray[$k];
        $zsuv_j--;
    }
    else { echo "Ошибка " . "[$i] [$j]". "<br/>"; }

}


echo "Справа на лево: " . "\n";
foreach ($figuresMass as $key_j => $val_j) {
    foreach ($figuresMass[$key_j] as $key_i => $val_i){
        echo "| " . $val_i . " ";
    }
    echo "|" ."\n";
}


?>