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<?php |
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/** |
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* PHPCoord. |
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* |
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* @author Doug Wright |
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*/ |
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declare(strict_types=1); |
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namespace PHPCoord\CoordinateOperation; |
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use function abs; |
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use function array_column; |
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use function array_merge; |
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use function array_pop; |
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use function array_shift; |
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use function array_sum; |
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use function assert; |
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use function count; |
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use DateTimeImmutable; |
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use function in_array; |
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use PHPCoord\CompoundPoint; |
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use PHPCoord\CoordinateReferenceSystem\CoordinateReferenceSystem; |
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use PHPCoord\CoordinateReferenceSystem\Geographic2D; |
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use PHPCoord\Exception\UnknownConversionException; |
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use PHPCoord\GeocentricPoint; |
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use PHPCoord\GeographicPoint; |
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use PHPCoord\Geometry\GeographicPolygon; |
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use PHPCoord\Point; |
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use PHPCoord\ProjectedPoint; |
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use PHPCoord\UnitOfMeasure\Time\Year; |
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use function strpos; |
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use function usort; |
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trait AutoConversion |
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{ |
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private int $maxChainDepth = 4; // if traits could have constants... |
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private static array $pathCache = []; |
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public function convert(CoordinateReferenceSystem $to, bool $ignoreBoundaryRestrictions = false): Point |
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{ |
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if ($this->getCRS() == $to) { |
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return $this; |
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} |
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if (strpos($this->getCRS()->getSRID(), CoordinateReferenceSystem::CRS_SRID_PREFIX_EPSG) !== 0 || strpos($to->getSRID(), CoordinateReferenceSystem::CRS_SRID_PREFIX_EPSG) !== 0) { |
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throw new UnknownConversionException('Automatic conversions are only supported for EPSG CRSs'); |
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} |
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$point = $this; |
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$path = $this->findOperationPath($to, $ignoreBoundaryRestrictions); |
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foreach ($path as $step) { |
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$target = CoordinateReferenceSystem::fromSRID($step['in_reverse'] ? $step['source_crs'] : $step['target_crs']); |
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$point = $point->performOperation($step['operation'], $target, $step['in_reverse']); |
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} |
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return $point; |
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} |
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protected function findOperationPath(CoordinateReferenceSystem $to, bool $ignoreBoundaryRestrictions): array |
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{ |
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$candidatePaths = $this->buildTransformationPathsToCRS($to); |
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usort($candidatePaths, static function (array $a, array $b) { |
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return count($a['path']) <=> count($b['path']) ?: $a['accuracy'] <=> $b['accuracy']; |
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}); |
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$boundaryCheckPoint = $ignoreBoundaryRestrictions ? null : $this->getPointForBoundaryCheck(); |
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foreach ($candidatePaths as $candidatePath) { |
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$ok = true; |
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foreach ($candidatePath['path'] as $pathStep) { |
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$operation = CoordinateOperations::getOperationData($pathStep['operation']); |
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if ($boundaryCheckPoint) { |
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//filter out operations that only operate outside this point |
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$polygon = GeographicPolygon::createFromArray($operation['bounding_box'], $operation['bounding_box_crosses_antimeridian']); |
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$ok = $ok && $polygon->containsPoint($boundaryCheckPoint); |
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} |
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$operations = static::resolveConcatenatedOperations($pathStep['operation'], false); |
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foreach ($operations as $operation) { |
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//filter out operations that require an epoch if we don't have one |
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if (!$this->getCoordinateEpoch() && in_array($operation['method'], [ |
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CoordinateOperationMethods::EPSG_TIME_DEPENDENT_COORDINATE_FRAME_ROTATION_GEOCEN, |
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CoordinateOperationMethods::EPSG_TIME_DEPENDENT_COORDINATE_FRAME_ROTATION_GEOG2D, |
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CoordinateOperationMethods::EPSG_TIME_DEPENDENT_COORDINATE_FRAME_ROTATION_GEOG3D, |
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CoordinateOperationMethods::EPSG_TIME_DEPENDENT_POSITION_VECTOR_TFM_GEOCENTRIC, |
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CoordinateOperationMethods::EPSG_TIME_DEPENDENT_POSITION_VECTOR_TFM_GEOG2D, |
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CoordinateOperationMethods::EPSG_TIME_DEPENDENT_POSITION_VECTOR_TFM_GEOG3D, |
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CoordinateOperationMethods::EPSG_TIME_SPECIFIC_COORDINATE_FRAME_ROTATION_GEOCEN, |
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CoordinateOperationMethods::EPSG_TIME_SPECIFIC_POSITION_VECTOR_TRANSFORM_GEOCEN, |
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], true)) { |
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$ok = false; |
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} |
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//filter out operations that require a specific epoch |
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if ($this->getCoordinateEpoch() && in_array($operation['method'], [ |
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CoordinateOperationMethods::EPSG_TIME_SPECIFIC_COORDINATE_FRAME_ROTATION_GEOCEN, |
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CoordinateOperationMethods::EPSG_TIME_SPECIFIC_POSITION_VECTOR_TRANSFORM_GEOCEN, |
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], true)) { |
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$params = CoordinateOperationParams::getParamData($pathStep['operation']); |
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$pointEpoch = Year::fromDateTime($this->getCoordinateEpoch()); |
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$ok = $ok && (abs($pointEpoch->getValue() - $params['Transformation reference epoch']['value']) <= 0.001); |
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} |
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} |
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} |
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if ($ok) { |
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return $candidatePath['path']; |
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} |
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} |
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throw new UnknownConversionException('Unable to perform conversion, please file a bug if you think this is incorrect'); |
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} |
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/** |
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* Build the set of *all* possible paths that lead from the current CRS to the target CRS. |
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*/ |
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protected function buildTransformationPathsToCRS(CoordinateReferenceSystem $target): array |
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{ |
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$cacheKey = $this->getCRS()->getSRID() . '|' . $target->getSRID(); |
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if (!isset(self::$pathCache[$cacheKey])) { |
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$simplePaths = []; |
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// Try a simple direct match before doing anything more complex! |
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if (CRSTransformations::getSupportedTransformationsForCRSPair($this->getCRS()->getSRID(), $target->getSRID())) { |
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$simplePaths[] = [$this->getCRS()->getSRID(), $target->getSRID()]; |
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} else { // Otherwise, recursively calculate permutations of intermediate CRSs |
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$visited = []; |
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foreach (CoordinateReferenceSystem::getSupportedSRIDs() as $crs => $name) { |
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$visited[$crs] = false; |
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} |
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$currentPath = []; |
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$this->DFS($this->getCRS()->getSRID(), $target->getSRID(), $visited, $currentPath, $simplePaths); |
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} |
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// Then expand each CRS->CRS permutation with the various ways of achieving that (can be lots :/) |
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$candidatePaths = []; |
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foreach ($simplePaths as $simplePath) { |
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$transformationsToMakePath = [[]]; |
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$from = array_shift($simplePath); |
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assert($from === $this->getCRS()->getSRID()); |
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do { |
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$to = array_shift($simplePath); |
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$wipTransformationsInPath = []; |
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foreach (CRSTransformations::getSupportedTransformationsForCRSPair($from, $to) as $transformation) { |
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foreach ($transformationsToMakePath as $transformationToMakePath) { |
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$wipTransformationsInPath[] = array_merge($transformationToMakePath, [$transformation]); |
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} |
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} |
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$transformationsToMakePath = $wipTransformationsInPath; |
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$from = $to; |
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} while (count($simplePath) > 0); |
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assert($to === $target->getSRID()); |
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$candidatePaths = array_merge($candidatePaths, $transformationsToMakePath); |
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} |
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$candidates = []; |
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foreach ($candidatePaths as $candidatePath) { |
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$candidates[] = ['path' => $candidatePath, 'accuracy' => array_sum(array_column($candidatePath, 'accuracy'))]; |
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} |
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self::$pathCache[$cacheKey] = $candidates; |
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} |
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return self::$pathCache[$cacheKey]; |
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} |
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protected function DFS(string $u, string $v, array &$visited, array &$currentPath, array &$simplePaths): void |
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{ |
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$currentPath[] = $u; |
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if ($u === $v) { |
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$simplePaths[] = $currentPath; |
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} else { |
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$visited[$u] = true; |
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if (count($currentPath) <= $this->maxChainDepth) { |
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foreach (CRSTransformations::getSupportedTransformationsForCRS($u) as $nextU) { |
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if (!$visited[$nextU]) { |
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$this->DFS($nextU, $v, $visited, $currentPath, $simplePaths); |
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} |
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} |
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} |
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} |
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array_pop($currentPath); |
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$visited[$u] = false; |
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} |
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/** |
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* Boundary polygons are defined as WGS84, so theoretically all that needs to happen is |
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* to conversion to WGS84 by calling ->convert(). However, that leads quickly to either circularity |
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* when a conversion is possible, or an exception because not every CRS has a WGS84 transformation |
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* available to it even when chaining. |
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*/ |
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protected function getPointForBoundaryCheck(): ?GeographicValue |
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{ |
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if ($this instanceof CompoundPoint) { |
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$point = $this->getHorizontalPoint(); |
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} else { |
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$point = $this; |
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} |
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try { |
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// try converting to WGS84 if possible... |
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return $point->convert(Geographic2D::fromSRID(Geographic2D::EPSG_WGS_84), true)->asGeographicValue(); |
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} catch (UnknownConversionException $e) { |
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/* |
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* If Projected then either the point is inside the boundary by definition |
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* or the user is deliberately exceeding the safe zone so safe to make a no-op either way. |
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*/ |
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if ($point instanceof ProjectedPoint) { |
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return null; |
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} |
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/* |
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* Otherwise, compensate for non-Greenwich Prime Meridian, but otherwise assume that coordinates |
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* are interchangeable between the actual CRS and WGS84. Boundaries are only defined to the nearest |
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* ≈1km so the error bound should be acceptable within the area of interest |
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*/ |
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if ($point instanceof GeographicPoint) { |
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return new GeographicValue($point->getLatitude(), $point->getLongitude()->subtract($point->getCRS()->getDatum()->getPrimeMeridian()->getGreenwichLongitude()), null, $point->getCRS()->getDatum()); |
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} |
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if ($point instanceof GeocentricPoint) { |
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$asGeographic = $point->asGeographicValue(); |
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return new GeographicValue($asGeographic->getLatitude(), $asGeographic->getLongitude()->subtract($asGeographic->getDatum()->getPrimeMeridian()->getGreenwichLongitude()), null, $asGeographic->getDatum()); |
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} |
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} |
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} |
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abstract public function getCRS(): CoordinateReferenceSystem; |
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abstract public function getCoordinateEpoch(): ?DateTimeImmutable; |
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abstract protected function performOperation(string $srid, CoordinateReferenceSystem $to, bool $inReverse): Point; |
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} |
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dvdoug /
PHPCoord
Loading history...
The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g.
excluded_paths: ["lib/*"], you can move it to the dependency path list as follows:For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths