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<?php

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namespace AmpProject;

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/**

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* Unit of a length.

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* This interface defines the available units that can be recognized in HTML and/or CSS dimensions.

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* @see https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Values_and_units

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* @package ampproject/amp-toolbox

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final class LengthUnit

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{

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/**

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* Centimeters.

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* 1cm = 96px/2.54.

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* @var string

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const CM = 'cm';

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/**

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* Millimeters.

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* 1mm = 1/10th of 1cm.

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* @var string

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const MM = 'mm';

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/**

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* Quarter-millimeters.

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* 1Q = 1/40th of 1cm.

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* @var string

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const Q = 'q';

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/**

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* Inches.

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* 1in = 2.54cm = 96px.

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* @var string

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const IN = 'in';

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/**

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* Picas.

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* 1pc = 1/6th of 1in.

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* @var string

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const PC = 'pc';

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/**

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* Points.

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* 1pt = 1/72th of 1in.

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* @var string

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const PT = 'pt';

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/**

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* Pixels.

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* 1px = 1/96th of 1in.

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* @var string

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const PX = 'px';

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/**

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* Font size of the parent, in the case of typographical properties like font-size, and font size of the element

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* itself, in the case of other properties like width.

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* @var string

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const EM = 'em';

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/**

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* x-height of the element's font.

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* @var string

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const EX = 'ex';

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/**

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* The advance measure (width) of the glyph "0" of the element's font.

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* @var string

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const CH = 'ch';

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/**

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* Font size of the root element.

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* @var string

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const REM = 'rem';

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/**

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* Line height of the element.

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* @var string

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const LH = 'lh';

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/**

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* 1% of the viewport's width.

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* @var string

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const VW = 'vw';

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/**

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* 1% of the viewport's height.

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* @var string

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const VH = 'vh';

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/**

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* 1% of the viewport's smaller dimension.

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* @var string

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const VMIN = 'vmin';

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/**

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* 1% of the viewport's larger dimension.

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* @var string

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const VMAX = 'vmax';

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/**

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* Set of known absolute units.

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* @var string[]

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const ABSOLUTE_UNITS = [

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self::CM,

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self::MM,

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self::Q,

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self::IN,

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self::PC,

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self::PT,

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self::PX,

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];

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/**

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* Set of known relative units.

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* @var string[]

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const RELATIVE_UNITS = [

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self::EM,

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self::EX,

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self::CH,

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self::REM,

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self::LH,

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self::VW,

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self::VH,

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self::VMIN,

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self::VMAX,

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];

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/**

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* Pixels per inch resolution to use for conversions.

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* @var int

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const PPI = 96;

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/**

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* Centimeters per inch.

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* @var float

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const CM_PER_IN = 2.54;

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/**

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* Convert a unit-based length into a number of pixels.

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* @param int|float $value Value to convert.

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* @param string $unit Unit of the value.

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* @return int|float|false Converted value, or false if it could not be converted.

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public static function convertIntoPixels($value, $unit)

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{

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if (0 === $value) {

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return 0;

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}

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switch ($unit) {

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case self::CM:

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return $value * self::PPI / self::CM_PER_IN;

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case self::MM:

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return $value * self::PPI / self::CM_PER_IN / 10;

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case self::Q:

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return $value * self::PPI / self::CM_PER_IN / 40;

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case self::IN:

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return $value * self::PPI;

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case self::PC:

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return $value * self::PPI / 6;

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case self::PT:

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return $value * self::PPI / 72;

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case self::PX:

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// No conversion needed for pixel values.

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return $value;

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default:

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return false;

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}

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}

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}

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