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<?php declare(strict_types=1); |
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namespace Stratadox\Pathfinder\Graph\Builder; |
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use function array_merge; |
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use function array_reduce; |
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use function chr; |
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use Stratadox\Pathfinder\Environment; |
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use Stratadox\Pathfinder\Graph\At; |
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use Stratadox\Pathfinder\Graph\Edges; |
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use Stratadox\Pathfinder\Graph\GeometricGraph; |
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use Stratadox\Pathfinder\Graph\Location; |
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use Stratadox\Pathfinder\Graph\Road; |
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use Stratadox\Pathfinder\Graph\Roads; |
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final class GridEnvironment |
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{ |
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private const MOVEMENT = [ |
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[ |
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['x' => -1, 'y' => 0], |
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['x' => 0, 'y' => -1], |
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['x' => 0, 'y' => 1], |
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['x' => 1, 'y' => 0], |
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], |
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[ |
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['x' => -1, 'y' => 0], |
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['x' => -1, 'y' => -1], |
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['x' => 1, 'y' => -1], |
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['x' => 0, 'y' => -1], |
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['x' => 0, 'y' => 1], |
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['x' => 1, 'y' => 1], |
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['x' => 1, 'y' => -1], |
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['x' => 1, 'y' => 0], |
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], |
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]; |
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/** @var Field[][] */ |
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private $rows; |
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private $allowDiagonal; |
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private function __construct(bool $allowDiagonal, ...$rows) |
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{ |
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$this->allowDiagonal = $allowDiagonal; |
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$this->rows = $rows; |
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} |
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public static function create(): self |
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{ |
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return new self(false); |
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} |
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public static function fromArray(array $gridData): self |
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{ |
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$grid = self::create(); |
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foreach ($gridData as $row => $columns) { |
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$squares = []; |
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foreach ($columns as $column => $price) { |
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$label = self::textual($column) . ($row + 1); |
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$squares[] = $price !== INF |
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? Square::labeled($label)->costing($price) |
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: Obstacle::here(); |
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} |
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$grid = $grid->withRow(...$squares); |
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} |
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return $grid; |
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} |
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private static function textual(int $column): string |
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{ |
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$finalPart = $column % 26; |
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$letter = chr(65 + $finalPart); |
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$firstPart = (int) ($column / 26); |
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if ($firstPart <= 0) { |
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return $letter; |
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} |
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return self::textual($firstPart - 1) . $letter; |
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} |
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public function withRow(Field ...$squares): self |
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{ |
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return new self( |
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$this->allowDiagonal, |
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...array_merge($this->rows, [$squares]) |
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); |
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} |
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public function diagonalMovementAllowed(): self |
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{ |
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return new self(true, ...$this->rows); |
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} |
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public function make(): Environment |
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{ |
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$locations = []; |
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foreach ($this->rows as $row => $fields) { |
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foreach ($fields as $column => $field) { |
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if ($field->isBlocked()) { |
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continue; |
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} |
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$locations[] = Location::at( |
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At::position($column, $row), |
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$field->label(), |
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$this->edgesStartingAt($row, $column) |
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); |
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} |
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} |
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return GeometricGraph::with(...$locations); |
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} |
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private function edgesStartingAt(int $row, int $column): Edges |
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{ |
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return Roads::available(...array_reduce( |
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self::MOVEMENT[$this->allowDiagonal], |
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function (Edges $result, array $add) use ($row, $column): Edges { |
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return $this->addIfAvailable( |
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$result, |
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$row + $add['x'], |
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$column + $add['y'] |
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); |
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}, |
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Roads::none() |
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)); |
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} |
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private function addIfAvailable(Edges $edges, int $row, int $column): Edges |
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{ |
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return $this->isAvailable($row, $column) |
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? $edges->add(Road::towards( |
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$this->targetAt($row, $column), |
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$this->costOfGettingTo($row, $column) |
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)) |
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: $edges; |
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} |
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private function isAvailable(int $row, int $column): bool |
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{ |
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return isset($this->rows[$row][$column]) |
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&& !$this->rows[$row][$column]->isBlocked(); |
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} |
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private function targetAt(int $row, int $column): string |
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{ |
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return $this->rows[$row][$column]->label(); |
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} |
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private function costOfGettingTo(int $row, int $column): float |
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{ |
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return $this->rows[$row][$column]->price(); |
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} |
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} |
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Stratadox /
Pathfinder
