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<?php |
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/** |
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* responsive-images-css |
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* |
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* @category Jkphl |
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* @package Jkphl\Respimgcss |
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* @subpackage Jkphl\Respimgcss\Application\Service |
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* @author Joschi Kuphal <[email protected]> / @jkphl |
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* @copyright Copyright © 2018 Joschi Kuphal <[email protected]> / @jkphl |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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*/ |
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/*********************************************************************************** |
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* The MIT License (MIT) |
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* |
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* Copyright © 2018 Joschi Kuphal <[email protected]> / @jkphl |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
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* the Software, and to permit persons to whom the Software is furnished to do so, |
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* subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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***********************************************************************************/ |
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namespace Jkphl\Respimgcss\Application\Service; |
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use Jkphl\Respimgcss\Application\Contract\UnitLengthInterface; |
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use Jkphl\Respimgcss\Application\Exceptions\InvalidArgumentException; |
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/** |
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* Length normalizer |
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* |
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* @package Jkphl\Respimgcss |
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* @subpackage Jkphl\Respimgcss\Application |
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*/ |
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class LengthNormalizerService |
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{ |
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/** |
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* EM to pixel ratio |
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* |
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* @var int |
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*/ |
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protected $emPixel; |
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/** |
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* Inch to Centimeter ratio |
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* |
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* @var float |
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*/ |
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CONST INCH_IN_CM = 2.54; |
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/** |
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* Default display density |
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* |
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* @var int |
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*/ |
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CONST DEFAULT_DPI = 72; |
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/** |
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* Pixel to point ratio |
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* |
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* @var float |
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*/ |
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CONST PX_IN_PT = .75; |
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/** |
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* Length normalizer constructor |
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* |
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* @param int $emPixel EM to pixel ratio |
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*/ |
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public function __construct(int $emPixel) |
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{ |
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$this->emPixel = $emPixel; |
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} |
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/** |
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* Normalize and return a value with unit |
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* |
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* @param float $value Value |
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* @param string $unit Unit |
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* |
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* @return float Normalized value |
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* @throws InvalidArgumentException If the unit is invalid |
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*/ |
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public function normalize(float $value, string $unit) |
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{ |
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switch ($unit) { |
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case UnitLengthInterface::UNIT_PIXEL: |
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return $value; |
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case UnitLengthInterface::UNIT_REM: |
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case UnitLengthInterface::UNIT_EM: |
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return $value * $this->emPixel; |
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case UnitLengthInterface::UNIT_CM: |
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return round($value * static::DEFAULT_DPI / static::INCH_IN_CM); |
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case UnitLengthInterface::UNIT_MM: |
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return round($value * static::DEFAULT_DPI / (static::INCH_IN_CM * 10)); |
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case UnitLengthInterface::UNIT_IN: |
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return $value * static::DEFAULT_DPI; |
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case UnitLengthInterface::UNIT_PT: |
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return round($value / static::PX_IN_PT); |
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case UnitLengthInterface::UNIT_PC: |
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return round($value * 12 / static::PX_IN_PT); |
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} |
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throw new InvalidArgumentException( |
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sprintf(InvalidArgumentException::INVALID_UNIT_STR, $unit), |
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InvalidArgumentException::INVALID_UNIT |
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); |
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} |
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} |
jkphl /
responsive-images-css
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