Frame.php

<?php

namespace Opsone\Util;

class Frame
{
    protected $point;
    protected $size;
    
    public function __construct(Point $point, Size $size)
    {
        $this->point = $point;
        $this->size  = $size;
    }
    
    public function __toString()
    {
        return __CLASS__ . '@' . spl_object_hash($this);
    }
}

Line.php

<?php

namespace Opsone\Util;

class Line
{
    protected $a;
    protected $b;

    public function __construct(Point $a, Point $b)
    {
        $this->a = $a;
        $this->b = $b;
    }
    
    public function intersect(Line $line)
    {
        
    }
    
    public function middle()
    {
        $x = ($this->a->x() + $this->b->x()) / 2;
        $x = ($this->a->y() + $this->b->y()) / 2;

        return new Point($x, $y);
    }
    
    public function __toString()
    {
        return __CLASS__ . '@' . spl_object_hash($this);
    }
}

Math.php

<?php

namespace Opsone\Util;

class Math
{
    public static function square($num)
    {
        return pow($num, 2);
    }

    public static function cube($num)
    {
        return pow($num, 3);
    }
}

Point.php

<?php

namespace Opsone\Util;

class Point
{
    protected $x;
    protected $y;
    
    public function __construct($x=null, $y=null)
    {
        $this->x = null;
        $this->y = null;
    }
    
    public function x()
    {
        return $this->x;
    }
    
    public function y()
    {
        return $this->y;
    }
    
    public function distance(Point $b)
    {
        return sqrt( Math::square($b->x() - $this->x()) + Math::square($b->y() - $this->y()) );
    }
    
    public function __toString()
    {
        return __CLASS__ . '@' . spl_object_hash($this);
    }
}

Size.php

<?php

namespace Opsone\Util;

class Size
{
    protected $width;
    protected $height;
    
    public function __construct($width, $height)
    {
        $this->width  = $width;
        $this->height = $height;
    }
    
    public function __toString()
    {
        return __CLASS__ . '@' . spl_object_hash($this);
    }
}

Volume.php

<?php

namespace Opsone\Util;

class Volume extends Size
{
    protected $depth;

    public function __construct($width, $height, $depth)
    {
        $this->depth = $depth;
        
        parent::__construct($width, $height);
    }
}