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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver\Puzzle\SlidingPuzzle; |
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use Stratadox\PuzzleSolver\Move; |
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final class Slide implements Move |
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{ |
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private const UP = 'up'; |
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private const DOWN = 'down'; |
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private const LEFT = 'left'; |
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private const RIGHT = 'right'; |
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private const ADD_ROW = [ |
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Slide::UP => -1, |
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Slide::DOWN => 1, |
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Slide::LEFT => 0, |
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Slide::RIGHT => 0, |
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]; |
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private const ADD_COL = [ |
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Slide::UP => 0, |
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Slide::DOWN => 0, |
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Slide::LEFT => -1, |
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Slide::RIGHT => 1, |
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]; |
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/** @var int */ |
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private $piece; |
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/** @var string */ |
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private $direction; |
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/** @var int */ |
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private $row; |
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/** @var int */ |
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private $col; |
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private function __construct( |
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int $piece, |
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string $direction, |
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int $row, |
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int $col |
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) { |
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$this->piece = $piece; |
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$this->direction = $direction; |
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$this->row = $row; |
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$this->col = $col; |
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} |
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public static function up(array $pieces, int $row, int $col): self |
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{ |
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return new self($pieces[$row][$col], Slide::UP, $row, $col); |
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} |
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public static function down(array $pieces, int $row, int $col): self |
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{ |
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return new self($pieces[$row][$col], Slide::DOWN, $row, $col); |
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} |
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public static function left(array $pieces, int $row, int $col): self |
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{ |
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return new self($pieces[$row][$col], Slide::LEFT, $row, $col); |
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} |
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public static function right(array $pieces, int $row, int $col): self |
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{ |
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return new self($pieces[$row][$col], Slide::RIGHT, $row, $col); |
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} |
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public function applyTo(array $pieces): array |
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{ |
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$otherR = $this->row + self::ADD_ROW[$this->direction]; |
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$otherC = $this->col + self::ADD_COL[$this->direction]; |
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$swap = $pieces[$otherR][$otherC]; |
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$pieces[$otherR][$otherC] = $pieces[$this->row][$this->col]; |
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$pieces[$this->row][$this->col] = $swap; |
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return $pieces; |
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} |
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public function __toString(): string |
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{ |
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return "Slide {$this->piece} {$this->direction}"; |
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} |
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} |
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Stratadox /
PuzzleSolver
