PHP拆分字体+获取字符宽度

我写道https://github.com/Pomax/PHP-Font-Parser因为这是很久以前的事了；fonttest.php生成JSON，但如果您实际运行代码，您会看到JSON还包含SVG路径轮廓，您可以将其放入带有<path d="..."/>元素的SVG框架中，并设置一个与字形的JSON提供的维度相匹配的视图框。

下面的代码将使用给定的字体从一个字母创建一个图像。按照这个步骤获取您的图像，然后在这里查看如何将其转换为SVG。。

    // Create an image from the letter "A" using a certain font at 12 points
    $image = createTextImage("A", "12", "font.ttf");
    /**
    * Make an image of text
    * @param type $text
    * @param type $size
    * @param type $color
    * @param type $font
    */
   function createTextImage($text, $font_size, $font_file){
          // Make sure font file exists
          if(!file_exists($font_file)) throw new Exception("Font file does not exist: {$font_file}");         
          // Retrieve bounding box:
          $type_space = imagettfbbox($font_size, 0, $font_file, $text);
          // Determine image width and height, 10 pixels are added for 5 pixels padding:
          $image_width = abs($type_space[4] - $type_space[0]) + 10;
          $image_height = abs($type_space[5] - $type_space[1]) + 10;
          $line_height = getLineHeight($font_size, $font_file) +10;
          // Create image:
          $image = imagecreatetruecolor($image_width, $image_height);
          // Allocate text and background colors (RGB format):
          $text_color = imagecolorallocate($image, 250, 250, 250);
          // Fill with transparent background
          imagealphablending($image, false);
          imagesavealpha($image, true);
          $transparent = imagecolorallocatealpha($image, 255, 255, 255, 127);
          imagefill($image, 0, 0, $transparent);
          // Fix starting x and y coordinates for the text:
          $x = 5; // Padding of 5 pixels.
          $y = $line_height - 5; // So that the text is vertically centered.
          // Add TrueType text to image:
          imagettftext($image, $font_size, 0, $x, $y, $text_color, $font_file, $text);
          // Save the image to a temp png file to use in our constructor
          $tmpname = tempnam('/tmp', 'IMG');
          // Generate and save image
          imagepng($image, $tmpname, 9);
          return $tmpname;
   }
   /**
   * Returns the line height based on the font and font size
   * @param type $fontSize
   * @param type $fontFace
   */
  function getLineHeight($fontSize, $fontFace){
    // Arbitrary text is drawn, can't be blank or just a space
    $type_space = imagettfbbox($fontSize, 0, $fontFace, "Robert is awesome!");
    $line_height = abs($type_space[5] - $type_space[1]);
    return $line_height;
  }