当前路径：Classes/PHPExcel/Writer/PDF/Core.php
<?php

/**
 *  PHPExcel_Writer_PDF_Core
 *
 *  Copyright (c) 2006 - 2015 PHPExcel
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  @category    PHPExcel
 *  @package     PHPExcel_Writer_PDF
 *  @copyright   Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 *  @license     http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 *  @version     ##VERSION##, ##DATE##
 */
abstract class PHPExcel_Writer_PDF_Core extends PHPExcel_Writer_HTML
{
    /**
     * Temporary storage directory
     *
     * @var string
     */
    protected $tempDir = '';

    /**
     * Font
     *
     * @var string
     */
    protected $font = 'freesans';

    /**
     * Orientation (Over-ride)
     *
     * @var string
     */
    protected $orientation;

    /**
     * Paper size (Over-ride)
     *
     * @var int
     */
    protected $paperSize;


    /**
     * Temporary storage for Save Array Return type
     *
     * @var string
     */
    private $saveArrayReturnType;

    /**
     * Paper Sizes xRef List
     *
     * @var array
     */
    protected static $paperSizes = array(
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_LETTER
            => 'LETTER',                 //    (8.5 in. by 11 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_LETTER_SMALL
            => 'LETTER',                 //    (8.5 in. by 11 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_TABLOID
            => array(792.00, 1224.00),   //    (11 in. by 17 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_LEDGER
            => array(1224.00, 792.00),   //    (17 in. by 11 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_LEGAL
            => 'LEGAL',                  //    (8.5 in. by 14 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_STATEMENT
            => array(396.00, 612.00),    //    (5.5 in. by 8.5 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_EXECUTIVE
            => 'EXECUTIVE',              //    (7.25 in. by 10.5 in.)
        PHPExcel_Worksheet_PageSetup::PAPERSIZE_A3
            => 'A3',                     //...