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<?php |
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/** |
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* PHP Exif FocalLength ValueObject |
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* |
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* @link http://github.com/PHPExif/php-exif-common for the canonical source repository |
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* @copyright Copyright (c) 2016 Tom Van Herreweghe <[email protected]> |
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* @license http://github.com/PHPExif/php-exif-common/blob/master/LICENSE MIT License |
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* @category PHPExif |
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* @package Common |
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*/ |
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namespace PHPExif\Common\Data\ValueObject\Exif; |
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use PHPExif\Common\Data\ValueObject\StringObject; |
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use \InvalidArgumentException; |
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use \RuntimeException; |
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/** |
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* FocalLength class |
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* |
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* A value object to describe the FocalLength data |
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* |
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* @category PHPExif |
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* @package Common |
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*/ |
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class FocalLength extends StringObject |
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{ |
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/** |
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* @param string $stringData |
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* |
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* @throws InvalidArgumentException If given argument is not a string |
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*/ |
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public function __construct($stringData) |
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{ |
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if (!is_string($stringData)) { |
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throw new InvalidArgumentException('Given data is not a string'); |
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} |
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if (!preg_match('#^([0-9]+)/([0-9]+)$#', $stringData, $matches)) { |
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throw new RuntimeException('Given focal length is not in a valid format. Need: "<number>/<number>"'); |
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} |
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$numerator = (int) $matches[1]; |
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$denominator = (int) $matches[2]; |
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// normalize: |
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$numerator /= $denominator; |
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$this->setStringData("{$numerator}mm"); |
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} |
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/** |
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* Creates new instance with data in milimeter |
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* |
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* @param string $stringData |
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* |
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* @return FocalLength |
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*/ |
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public static function fromMM($stringData) |
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{ |
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if (!is_string($stringData)) { |
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throw new InvalidArgumentException('Given data is not a string'); |
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} |
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if (!preg_match('#^([0-9]+)mm$#', $stringData, $matches)) { |
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throw new RuntimeException('Given focal length is not in a valid format. Need: "<number>mm"'); |
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} |
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$numerator = $matches[1]; |
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return new self( |
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"{$numerator}/1" |
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); |
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} |
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/** |
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* Creates a new instance from given FocalLength object |
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* |
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* @param FocalLength $focalLength |
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* |
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* @return FocalLength |
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*/ |
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public static function fromFocalLength(FocalLength $focalLength) |
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{ |
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return self::fromMM($focalLength->getStringData()); |
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} |
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} |
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PHPExif /
php-exif-common
