Gradient
3 years ago
Surface
3 years ago
Tag
3 years ago
CssLength.php
3 years ago
DefaultStyle.php
3 years ago
Document.php
3 years ago
Style.php
3 years ago
CssLength.php
99 lines
| 1 | <?php |
| 2 | |
| 3 | namespace IAWP\Svg; |
| 4 | |
| 5 | class CssLength |
| 6 | { |
| 7 | /** |
| 8 | * Array of valid css length units. |
| 9 | * Should be pre-sorted by unit text length so no earlier length can be |
| 10 | * contained within a latter (eg. 'in' within 'vmin'). |
| 11 | * |
| 12 | * @var string[] |
| 13 | */ |
| 14 | protected static $units = ['vmax', 'vmin', 'rem', 'px', 'pt', 'cm', 'mm', 'in', 'pc', 'em', 'ex', 'ch', 'vw', 'vh', '%', 'q']; |
| 15 | /** |
| 16 | * A list of units that are inch-relative, and their unit division within an inch. |
| 17 | * |
| 18 | * @var array<string, float> |
| 19 | */ |
| 20 | protected static $inchDivisions = ['in' => 1, 'cm' => 2.54, 'mm' => 25.4, 'q' => 101.6, 'pc' => 6, 'pt' => 72]; |
| 21 | /** |
| 22 | * The CSS length unit indicator. |
| 23 | * Will be lower-case and one of the units listed in the '$units' array or empty. |
| 24 | * |
| 25 | * @var string |
| 26 | */ |
| 27 | protected $unit = ''; |
| 28 | /** |
| 29 | * The numeric value of the given length. |
| 30 | * |
| 31 | * @var float |
| 32 | */ |
| 33 | protected $value = 0; |
| 34 | /** |
| 35 | * The original unparsed length provided. |
| 36 | * |
| 37 | * @var string |
| 38 | */ |
| 39 | protected $unparsed; |
| 40 | public function __construct(string $length) |
| 41 | { |
| 42 | $this->unparsed = $length; |
| 43 | $this->parseLengthComponents($length); |
| 44 | } |
| 45 | /** |
| 46 | * Parse out the unit and value components from the given string length. |
| 47 | */ |
| 48 | protected function parseLengthComponents(string $length) : void |
| 49 | { |
| 50 | $length = \strtolower($length); |
| 51 | foreach (self::$units as $unit) { |
| 52 | $pos = \strpos($length, $unit); |
| 53 | if ($pos) { |
| 54 | $this->value = \floatval(\substr($length, 0, $pos)); |
| 55 | $this->unit = $unit; |
| 56 | return; |
| 57 | } |
| 58 | } |
| 59 | $this->unit = ''; |
| 60 | $this->value = \floatval($length); |
| 61 | } |
| 62 | /** |
| 63 | * Get the unit type of this css length. |
| 64 | * Units are standardised to be lower-cased. |
| 65 | * |
| 66 | * @return string |
| 67 | */ |
| 68 | public function getUnit() : string |
| 69 | { |
| 70 | return $this->unit; |
| 71 | } |
| 72 | /** |
| 73 | * Get this CSS length in the equivalent pixel count size. |
| 74 | * |
| 75 | * @param float $referenceSize |
| 76 | * @param float $dpi |
| 77 | * |
| 78 | * @return float |
| 79 | */ |
| 80 | public function toPixels(float $referenceSize = 11.0, float $dpi = 96.0) : float |
| 81 | { |
| 82 | // Standard relative units |
| 83 | if (\in_array($this->unit, ['em', 'rem', 'ex', 'ch'])) { |
| 84 | return $this->value * $referenceSize; |
| 85 | } |
| 86 | // Percentage relative units |
| 87 | if (\in_array($this->unit, ['%', 'vw', 'vh', 'vmin', 'vmax'])) { |
| 88 | return $this->value * ($referenceSize / 100); |
| 89 | } |
| 90 | // Inch relative units |
| 91 | if (\in_array($this->unit, \array_keys(static::$inchDivisions))) { |
| 92 | $inchValue = $this->value * $dpi; |
| 93 | $division = static::$inchDivisions[$this->unit]; |
| 94 | return $inchValue / $division; |
| 95 | } |
| 96 | return $this->value; |
| 97 | } |
| 98 | } |
| 99 |