Horde_Pdf_Writer::setMargins PHP Method

    public function setMargins($left, $top, $right = null)
    {
        /* Set left and top margins. */
        $this->_left_margin = $left;
        $this->_top_margin = $top;
        /* If no right margin set default to same as left. */
        $this->_right_margin = is_null($right) ? $left : $right;
    }

 public function run()
 {
     extract($this->_params, EXTR_REFS);
     $driver = $GLOBALS['injector']->getInstance('Jonah_Driver');
     if (!$story_id) {
         try {
             $story_id = $GLOBALS['injector']->getInstance('Jonah_Driver')->getLatestStoryId($channel_id);
         } catch (Exception $e) {
             $this->_exit($e->getMessage());
         }
     }
     try {
         $story = $driver->getStory($story_id, !$browser->isRobot());
     } catch (Exception $e) {
         $this->_exit($e->getMessage());
     }
     // Convert the body from HTML to text if necessary.
     if (!empty($story['body_type']) && $story['body_type'] == 'richtext') {
         $story['body'] = $GLOBALS['injector']->getInstance('Horde_Core_Factory_TextFilter')->filter($story['body'], 'html2text');
     }
     // Set up the PDF object.
     $pdf = new Horde_Pdf_Writer(array('format' => 'Letter', 'unit' => 'pt'));
     $pdf->setMargins(50, 50);
     // Enable automatic page breaks.
     $pdf->setAutoPageBreak(true, 50);
     // Start the document.
     $pdf->open();
     // Start a page.
     $pdf->addPage();
     // Publication date.
     if (!empty($story['published_date'])) {
         $pdf->setFont('Times', 'B', 14);
         $pdf->cell(0, 14, $story['published_date'], 0, 1);
         $pdf->newLine(10);
     }
     // Write the header in Times 24 Bold.
     $pdf->setFont('Times', 'B', 24);
     $pdf->multiCell(0, 24, $story['title'], 'B', 1);
     $pdf->newLine(20);
     // Write the story body in Times 14.
     $pdf->setFont('Times', '', 14);
     $pdf->write(14, $story['body']);
     // Output the generated PDF.
     $browser->downloadHeaders($story['title'] . '.pdf', 'application/pdf');
     echo $pdf->getOutput();
 }