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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\UnitOfMeasure\Scale; |
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use PHPCoord\Exception\UnknownUnitOfMeasureException; |
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use PHPCoord\UnitOfMeasure\UnitOfMeasure; |
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use function array_map; |
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abstract class Scale implements UnitOfMeasure |
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{ |
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/** |
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* Coefficient |
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* Used when parameters are coefficients. They inherently take the units which depend upon the term to which the |
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* coefficient applies. |
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*/ |
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public const EPSG_COEFFICIENT = 'urn:ogc:def:uom:EPSG::9203'; |
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/** |
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* Parts per billion |
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* Billion is internationally ambiguous, in different languages being 1E+9 and 1E+12. One billion taken here to be |
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* 1E+9. |
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*/ |
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public const EPSG_PARTS_PER_BILLION = 'urn:ogc:def:uom:EPSG::1028'; |
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/** |
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* Parts per million. |
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*/ |
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public const EPSG_PARTS_PER_MILLION = 'urn:ogc:def:uom:EPSG::9202'; |
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/** |
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* Unity |
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* EPSG standard unit for scale. SI coherent derived unit (standard unit) for dimensionless quantity, expressed by |
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* the number one but this is not explicitly shown. |
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*/ |
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public const EPSG_UNITY = 'urn:ogc:def:uom:EPSG::9201'; |
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/** |
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* @var array<string, array{name: string, fqcn?: class-string<self>, help: string}> |
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*/ |
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protected static array $sridData = [ |
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'urn:ogc:def:uom:EPSG::1028' => [ |
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'name' => 'parts per billion', |
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'help' => 'Billion is internationally ambiguous, in different languages being 1E+9 and 1E+12. One billion taken here to be 1E+9.', |
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], |
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'urn:ogc:def:uom:EPSG::9201' => [ |
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'name' => 'unity', |
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'help' => 'EPSG standard unit for scale. SI coherent derived unit (standard unit) for dimensionless quantity, expressed by the number one but this is not explicitly shown.', |
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], |
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'urn:ogc:def:uom:EPSG::9202' => [ |
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'name' => 'parts per million', |
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'help' => '', |
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], |
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'urn:ogc:def:uom:EPSG::9203' => [ |
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'name' => 'coefficient', |
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'help' => 'Used when parameters are coefficients. They inherently take the units which depend upon the term to which the coefficient applies.', |
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], |
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]; |
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abstract public function __construct(float $scale); |
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abstract public function asUnity(): Unity; |
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public function add(self $unit): self |
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{ |
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if ($this::class === $unit::class) { |
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return new static($this->getValue() + $unit->getValue()); |
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} |
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$resultAsUnity = new Unity($this->asUnity()->getValue() + $unit->asUnity()->getValue()); |
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$conversionRatio = (new static(1))->asUnity()->getValue(); |
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return new static($resultAsUnity->getValue() / $conversionRatio); |
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} |
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public function subtract(self $unit): self |
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{ |
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if ($this::class === $unit::class) { |
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return new static($this->getValue() - $unit->getValue()); |
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} |
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$resultAsUnity = new Unity($this->asUnity()->getValue() - $unit->asUnity()->getValue()); |
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$conversionRatio = (new static(1))->asUnity()->getValue(); |
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return new static($resultAsUnity->getValue() / $conversionRatio); |
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} |
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public function multiply(float $multiplicand): self |
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{ |
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return new static($this->getValue() * $multiplicand); |
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} |
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public function divide(float $divisor): self |
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{ |
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return new static($this->getValue() / $divisor); |
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} |
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public static function makeUnit(float $measurement, string $srid): self |
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{ |
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switch ($srid) { |
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197 |
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case self::EPSG_COEFFICIENT: |
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return new Coefficient($measurement); |
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case self::EPSG_PARTS_PER_BILLION: |
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return new PartsPerBillion($measurement); |
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case self::EPSG_PARTS_PER_MILLION: |
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return new PartsPerMillion($measurement); |
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case self::EPSG_UNITY: |
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return new Unity($measurement); |
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} |
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throw new UnknownUnitOfMeasureException($srid); |
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} |
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/** |
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* @return array<string, string> |
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*/ |
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public static function getSupportedSRIDs(): array |
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{ |
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return array_map(fn ($supportedSrid) => $supportedSrid['name'], self::$sridData); |
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} |
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/** |
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* @return array<string, array{name: string, help: string}> |
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*/ |
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public static function getSupportedSRIDsWithHelp(): array |
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{ |
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return array_map(fn (array $data) => [ |
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'name' => $data['name'], |
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'help' => $data['help'], |
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], static::$sridData); |
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} |
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public function __toString(): string |
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{ |
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return (string) $this->getValue(); |
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} |
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} |
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dvdoug /
PHPCoord
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