Why is this code to center text on a PDF using the PHP Zend_Pdf Library not working?

Question

I\'m attempting to dynamically create PDF documents on the server and send them to the client using the Zend_Pdf library. All text on the PDF needs to be center aligned to the p

Answer 1

try to use this function:

/**
    * Return length of generated string in points
    *
    * @param string                     $text
    * @param Zend_Pdf_Resource_Font|Zend_Pdf_Page     $font
    * @param int                         $fontSize
    * @return double
*/
public static function getTextWidth($text, $resource, $fontSize = null/*, $encoding = null*/) {
    //if( $encoding == null ) $encoding = 'UTF-8';

    if( $resource instanceof Zend_Pdf_Page ){
        $font = $resource->getFont();
        $fontSize = $resource->getFontSize();
    }elseif( $resource instanceof Zend_Pdf_Resource_Font ){
        $font = $resource;
        if( $fontSize === null ) throw new Exception('The fontsize is unknown');
    }

    if( !$font instanceof Zend_Pdf_Resource_Font ){
        throw new Exception('Invalid resource passed');
    }

    $drawingText = $text;//iconv ( '', $encoding, $text );
    $characters = array ();
    for($i = 0; $i < strlen ( $drawingText ); $i ++) {
        $characters [] = ord ( $drawingText [$i] );
    }
    $glyphs = $font->glyphNumbersForCharacters ( $characters );
    $widths = $font->widthsForGlyphs ( $glyphs );

    $textWidth = (array_sum ( $widths ) / $font->getUnitsPerEm ()) * $fontSize;
    return $textWidth;
}

and call it on your render function, like:

if ($this->getAlign() == self::TEXT_ALIGN_CENTER)
{
        $x = ($currentPage->getWidth() - $this->getTextWidth($text, $currentPage)) / 2;
}
...
$currentPage->drawText($text, $x, $y, ...);

Answer 2

In case anyone else runs into a similar problem, the issue is here:

function getTextWidth($text, $font, $font_size) {
    $drawing_text = iconv('', 'UTF-8', $text);
    $characters    = array();
    for ($i = 0; $i < strlen($drawing_text); $i++) {
        $characters[] = (ord($drawing_text[$i++]) << 8) | ord ($drawing_text[$i]);
    }
    $glyphs        = $font->glyphNumbersForCharacters($characters);
    $widths        = $font->widthsForGlyphs($glyphs);
    $text_width   = (array_sum($widths) / $font->getUnitsPerEm()) * $font_size;
    return $text_width;
}

When building the characters array, the characters are being loaded incorrectly - 8 bits, not 16.

$characters[] = ord ($drawing_text[$i]);

This solves the problem, and correctly calculates text width.

Answer 3

If there is anyone looking for solution to Latin american characters like ó,á,é this worked for me

try {
          $drawing_text = iconv('UTF-8', 'UTF-8', $text);
          $characters    = array();
          for ($i = 0; $i < strlen($drawing_text); $i++) {
              $characters[] = ord ($drawing_text[$i]);
          }
          $glyphs        = $font->glyphNumbersForCharacters($characters);
          $widths        = $font->widthsForGlyphs($glyphs);
          $text_width   = (array_sum($widths) / $font->getUnitsPerEm()) * $font_size;
          return $text_width;
        } catch (\Exception $e) {
          //echo "$e";
        }