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<?php declare(strict_types=1); |
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namespace Stratadox\GraphpFinder; |
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use function array_key_exists; |
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use Fhaculty\Graph\Edge\Base as Edge; |
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use Fhaculty\Graph\Exception\OutOfBoundsException; |
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use Fhaculty\Graph\Graph; |
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use InvalidArgumentException; |
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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\Ids; |
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use Stratadox\Pathfinder\Labels; |
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use Stratadox\Pathfinder\Position; |
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final class AdaptedEnvironment implements Environment |
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{ |
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private $graph; |
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private $coordinate; |
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private $position = []; |
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private function __construct(Graph $graph, array $coordinateOffset) |
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{ |
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$this->graph = $graph; |
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$this->coordinate = $coordinateOffset; |
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} |
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public static function from(Graph $graph): Environment |
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{ |
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return new self($graph, ['x', 'y']); |
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} |
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public static function from3D(Graph $graph): Environment |
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{ |
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return new self($graph, ['x', 'y', 'z']); |
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} |
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public function all(): Labels |
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{ |
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return Ids::consistingOf(...$this->graph->getVertices()->getIds()); |
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} |
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public function neighboursOf(string $node): Labels |
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{ |
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$neighbours = []; |
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try { |
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$start = $this->graph->getVertices()->getVertexId($node); |
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/** @var Edge $edge */ |
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foreach ($start->getEdgesOut() as $edge) { |
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$neighbours[] = (string) $edge->getVertexToFrom($start)->getId(); |
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} |
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} catch (OutOfBoundsException $e) { |
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// no node, no neighbours |
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} |
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return Ids::consistingOf(...$neighbours); |
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} |
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public function areNeighbours(string $source, string $neighbour): bool |
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{ |
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try { |
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$start = $this->graph->getVertices()->getVertexId($source); |
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} catch (OutOfBoundsException $e) { |
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// no source node, no neighbours |
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return false; |
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} |
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/** @var Edge $edge */ |
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foreach ($start->getEdgesOut() as $edge) { |
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if ((string) $edge->getVertexToFrom($start)->getId() === $neighbour) { |
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return true; |
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} |
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} |
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return false; |
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} |
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public function has(string $node): bool |
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{ |
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return $this->graph->hasVertex($node); |
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} |
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public function movementCostBetween( |
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string $source, |
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string $neighbour |
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): float { |
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try { |
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$start = $this->graph->getVertices()->getVertexId($source); |
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} catch (OutOfBoundsException $e) { |
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throw new InvalidArgumentException("Vertex $source not found."); |
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} |
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/** @var Edge $edge */ |
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foreach ($start->getEdgesOut() as $edge) { |
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if ((string) $edge->getVertexToFrom($start)->getId() === $neighbour) { |
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return (float) $edge->getWeight(); |
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} |
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} |
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throw new InvalidArgumentException( |
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"Vertices $source and $neighbour are not neighbours." |
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); |
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} |
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public function hasNegativeEdgeCosts(): bool |
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{ |
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/** @var Edge $edge */ |
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foreach ($this->graph->getEdges() as $edge) { |
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if ($edge->getWeight() < 0) { |
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return true; |
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} |
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} |
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return false; |
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} |
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public function positionOf(string $node): Position |
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{ |
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if (!array_key_exists($node, $this->position)) { |
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try { |
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$vertex = $this->graph->getVertices()->getVertexId($node); |
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} catch (OutOfBoundsException $e) { |
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throw new InvalidArgumentException($e->getMessage(), 0, $e); |
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} |
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$coordinates = []; |
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foreach ($this->coordinate as $key) { |
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$coordinates[] = $vertex->getAttribute($key, 0); |
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} |
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$this->position[$node] = At::position(...$coordinates); |
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} |
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return $this->position[$node]; |
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} |
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} |
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Stratadox /
GraphpFinder
