<?php
namespace BlackScorp\Astar\Heuristic;

use BlackScorp\Astar\HeuristicInterface;
use BlackScorp\Astar\Node;

class Manhattan implements HeuristicInterface
{

    public function compare(Node $node, Node $goal)
    {
        $deltaX = abs($node->getX() - $goal->getX());
        $deltaY = abs($node->getY() - $goal->getY());
        return $deltaX + $deltaY;
    }
}