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<?php |
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namespace OneSheet\Size; |
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/** |
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* Class SizeCalculator to calculate the approximate width |
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* of cells based on the current font, size and content. |
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* |
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* @package OneSheet\Size |
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*/ |
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class SizeCalculator |
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{ |
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/** |
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* @var array |
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*/ |
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private $fonts; |
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/** |
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* @var array |
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*/ |
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private $sizes; |
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/** |
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* @param string|null $fontsDirectory |
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*/ |
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public function __construct($fontsDirectory) |
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{ |
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$fontsPattern = $this->determineFontsPattern($fontsDirectory); |
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foreach (glob($fontsPattern) as $path) { |
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$meta = new FontMeta($path); |
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if (strlen($meta->getFontName())) { |
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$this->fonts[$meta->getFontName()] = $path; |
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} |
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} |
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} |
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/** |
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* Get the calculated cell width for a given value. |
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* |
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* @param string $fontName |
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* @param int $fontSize |
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* @param mixed $value |
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* |
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* @return float|int |
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*/ |
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public function getCellWidth($fontName, $fontSize, $value) |
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{ |
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$width = 1; |
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foreach ($this->getSingleCharacterArray($value) as $char) { |
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$width += $this->getCharacterWidth($fontName, $fontSize, $char); |
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} |
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return $width; |
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} |
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/** |
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* Get width of a single character. Calculate & cache if necessary. |
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* |
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* @param string $fontName |
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* @param int $fontSize |
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* @param string $char |
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* |
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* @return float |
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*/ |
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private function getCharacterWidth($fontName, $fontSize, $char) |
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{ |
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if (!isset($this->sizes[$fontName][$fontSize][$char])) { |
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$this->sizes[$fontName][$fontSize][$char] = |
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$this->calculateCharacterWith($fontName, $fontSize, $char); |
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} |
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return $this->sizes[$fontName][$fontSize][$char]; |
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} |
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/** |
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* Calculate the width of a single character for the given fontname and size. |
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* Create image that contains the character 100 times to get more accurate results. |
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* |
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* @param string $fontName |
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* @param int $fontSize |
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* @param string $char |
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* |
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* @return float |
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*/ |
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private function calculateCharacterWith($fontName, $fontSize, $char) |
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{ |
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if (isset($this->fonts[$fontName])) { |
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$box = imageftbbox($fontSize, 0, $this->fonts[$fontName], str_repeat($char, 100)); |
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$width = abs($box[4] - $box[0]) / 6.73 / 100; |
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return round($width, 3); |
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} |
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return 0.1 * $fontSize; |
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} |
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/** |
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* Split value into individual characters. |
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* |
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* @param mixed $value |
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* @return array |
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*/ |
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private function getSingleCharacterArray($value) |
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{ |
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if (mb_strlen($value) == strlen($value)) { |
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return str_split($value); |
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} |
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return preg_split('~~u', $value, -1, PREG_SPLIT_NO_EMPTY); |
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} |
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/** |
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* Determine glob pattern by fonts directory. |
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* |
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* @param $fontsDirectory |
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* @return string |
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*/ |
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private function determineFontsPattern($fontsDirectory) |
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{ |
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if (!isset($fontsDirectory) || !is_dir($fontsDirectory)) { |
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$fontsDirectory = '/usr/share/fonts'; |
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if (false !== stripos(php_uname(), 'win')) { |
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$fontsDirectory = 'C:/Windows/Fonts'; |
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} |
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} |
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return rtrim($fontsDirectory, DIRECTORY_SEPARATOR) . '/*.ttf'; |
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} |
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} |
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nimmneun /
onesheet
