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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; |
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use PHPCoord\CoordinateReferenceSystem\Projected; |
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use PHPCoord\CoordinateSystem\Axis; |
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use PHPCoord\Exception\UnknownAxisException; |
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use PHPCoord\UnitOfMeasure\Length\Length; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use PHPCoord\UnitOfMeasure\UnitOfMeasureFactory; |
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/** |
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* Coordinate representing a point on a map projection. |
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* @author Doug Wright |
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*/ |
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class WestingNorthingPoint extends ProjectedPoint |
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{ |
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/** |
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* Westing. |
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* @var Length |
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*/ |
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protected $westing; |
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/** |
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* Northing. |
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* @var Length |
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*/ |
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protected $northing; |
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/** |
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* Constructor. |
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* @param Length $westing refer to CRS for preferred unit of measure, but any length unit accepted |
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* @param Length $northing refer to CRS for preferred unit of measure, but any length unit accepted |
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*/ |
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public function __construct(Length $westing, Length $northing, Projected $crs) |
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{ |
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parent::__construct($crs); |
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$this->westing = UnitOfMeasureFactory::convertLength($westing, $this->getAxisByName(Axis::WESTING)->getUnitOfMeasureId()); |
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$this->northing = UnitOfMeasureFactory::convertLength($northing, $this->getAxisByName(Axis::NORTHING)->getUnitOfMeasureId()); |
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} |
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public function getWesting(): Length |
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{ |
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return $this->westing; |
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} |
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public function getNorthing(): Length |
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{ |
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return $this->northing; |
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} |
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/** |
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* Calculate distance between two points. |
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* Because this is a simple grid, we can use Pythagoras. |
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*/ |
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public function calculateSurfaceDistance(Point $to): Length |
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{ |
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if ($to->getCRS()->getEpsgCode() !== $this->crs->getEpsgCode()) { |
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throw new \InvalidArgumentException('Can only calculate distances between two points in the same CRS'); |
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} |
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/* @var WestingNorthingPoint $to */ |
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return new Metre( |
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sqrt( |
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($to->getWesting()->getValue() - $this->getWesting()->getValue()) ** 2 + |
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($to->getNorthing()->getValue() - $this->getNorthing()->getValue()) ** 2 |
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) |
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); |
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} |
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public function __toString(): string |
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{ |
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$values = []; |
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foreach ($this->getCRS()->getCoordinateSystem()->getAxes() as $axis) { |
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if ($axis->getName() === Axis::WESTING) { |
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$values[] = $this->westing; |
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} elseif ($axis->getName() === Axis::NORTHING) { |
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$values[] = $this->northing; |
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} else { |
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throw new UnknownAxisException(); // @codeCoverageIgnore |
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} |
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} |
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return '(' . implode(', ', $values) . ')'; |
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} |
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} |
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dvdoug /
PHPCoord
