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

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忘掉有多难
忘掉有多难 2021-02-09 15:14

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

3条回答
  •  长发绾君心
    2021-02-09 15:51

    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, ...);
    

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