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<?php |
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namespace geoPHP\Geometry; |
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use geoPHP\Exception\InvalidGeometryException; |
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/** |
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* A curve consists of a sequence of Points. |
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* |
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* @package GeoPHPGeometry |
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*/ |
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abstract class Curve extends Collection |
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{ |
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/** |
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* @var Point |
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*/ |
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protected $startPoint; |
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/** |
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* @var Point |
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*/ |
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protected $endPoint; |
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public function __construct( |
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array $components = [], |
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bool $allowEmptyComponents = false, |
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string $allowedComponentType = Point::class |
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) { |
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parent::__construct($components, $allowEmptyComponents, $allowedComponentType); |
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if (count($this->components) === 1) { |
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throw new InvalidGeometryException("Cannot construct a " . static::class . " with a single point"); |
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} |
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} |
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/** |
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* @return string "Curve" |
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*/ |
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public function geometryType(): string |
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{ |
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return Geometry::CURVE; |
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} |
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/** |
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* @return int 1 |
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*/ |
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public function dimension(): int |
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{ |
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return 1; |
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} |
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/** |
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* @return Point |
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*/ |
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public function startPoint() |
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{ |
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if (!isset($this->startPoint)) { |
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$this->startPoint = $this->pointN(1); |
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} |
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return $this->startPoint; |
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} |
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/** |
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* @return Point |
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*/ |
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public function endPoint() |
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{ |
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if (!isset($this->endPoint)) { |
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$this->endPoint = $this->pointN($this->numPoints()); |
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} |
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return $this->endPoint; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isClosed(): bool |
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{ |
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return $this->startPoint()->equals($this->endPoint()); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isRing(): bool |
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{ |
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return ($this->isClosed() && $this->isSimple()); |
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} |
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/** |
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* Tests whether this geometry is simple. |
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* According to the OGR specification a ring is only simple if its start and end point are equal (in all values). |
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* Currently, neither GEOS, nor PostGIS support it. |
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* |
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* @return bool |
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*/ |
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public function isSimple(): bool |
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{ |
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return $this->startPoint()->equals($this->endPoint()); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isValid(): bool |
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{ |
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$geosObj = $this->getGeos(); |
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if (is_object($geosObj)) { |
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/** @noinspection PhpUndefinedMethodInspection */ |
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return $geosObj->checkValidity()['valid']; |
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} |
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return $this->isSimple(); |
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} |
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/** |
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* The boundary of a non-closed Curve consists of its end Points. |
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* |
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* @return LineString|MultiPoint |
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*/ |
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public function boundary(): Geometry |
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{ |
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return $this->isEmpty() ? |
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new LineString() : |
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($this->isClosed() ? |
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new MultiPoint() : |
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new MultiPoint([$this->startPoint() ?? new Point(), $this->endPoint() ?? new Point()]) |
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); |
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} |
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/** |
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* Not valid for this geometry type |
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* |
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* @return float 0.0 |
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*/ |
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public function getArea(): float |
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{ |
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return 0.0; |
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} |
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} |
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This check looks for function or method calls that always return null and whose return value is assigned to a variable.
The method
getObject()
can return nothing but null, so it makes no sense to assign that value to a variable.The reason is most likely that a function or method is imcomplete or has been reduced for debug purposes.