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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 InvalidArgumentException; |
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use Stratadox\Pathfinder\Environment; |
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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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use Stratadox\Pathfinder\Metric; |
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use Stratadox\Pathfinder\Position; |
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final class GraphEnvironment |
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{ |
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private $metric; |
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private $locations; |
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private function __construct(?Metric $metric, Location ...$locations) |
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{ |
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$this->metric = $metric; |
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$this->locations = $locations; |
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} |
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public static function create(): self |
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{ |
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return new self(null); |
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} |
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public function withLocation( |
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string $label, |
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Position $position, |
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EdgeDefinition $edges |
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): self { |
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return new self($this->metric, ...array_merge( |
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$this->locations, |
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[Location::at($position, $label, $edges->gather())] |
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)); |
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} |
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public function determineEdgeCostsAs(Metric $metric): self |
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{ |
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return new self($metric, ...$this->locations); |
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} |
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public function make(): Environment |
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{ |
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return GeometricGraph::with(...$this->actualLocations()); |
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} |
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private function actualLocations(): array |
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{ |
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if (null === $this->metric) { |
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return $this->locations; |
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} |
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$actualLocations = []; |
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foreach ($this->locations as $i => $location) { |
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$newEdges = []; |
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foreach ($location->edges() as $edge) { |
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$newEdges[] = Road::towards($edge->target(), $this->newCost( |
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$edge->cost(), |
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$this->metric->distanceBetween( |
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$location->position(), |
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$this->positionOf($edge->target()) |
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) |
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)); |
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} |
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$actualLocations[] = Location::at( |
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$location->position(), |
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$location->label(), |
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Roads::available(...$newEdges) |
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); |
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} |
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return $actualLocations; |
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} |
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private function newCost(float $previousCost, float $distance): float |
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{ |
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return $previousCost - 1.0 + $distance; |
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} |
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private function positionOf(string $node): Position |
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{ |
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foreach ($this->locations as $location) { |
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if ($node === $location->label()) { |
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return $location->position(); |
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} |
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} |
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throw new InvalidArgumentException("$node does not exist!"); |
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} |
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} |
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Stratadox /
Pathfinder
