当前路径：Classes/PHPExcel/Writer/Excel2007/Drawing.php
<?php

/**
 * PHPExcel_Writer_Excel2007_Drawing
 *
 * 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_Excel2007
 * @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##
 */
class PHPExcel_Writer_Excel2007_Drawing extends PHPExcel_Writer_Excel2007_WriterPart
{
    /**
     * Write drawings to XML format
     *
     * @param     PHPExcel_Worksheet    $pWorksheet
     * @param    int                    &$chartRef        Chart ID
     * @param    boolean                $includeCharts    Flag indicating if we should include drawing details for charts
     * @return     string                 XML Output
     * @throws     PHPExcel_Writer_Exception
     */
    public function writeDrawings(PHPExcel_Worksheet $pWorksheet = null, &$chartRef, $includeCharts = false)
    {
        // Create XML writer
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
        }

        // XML header
        $objWriter->startDocument('1.0', 'UTF-8', 'yes');

        // xdr:wsDr
        $objWriter->startElement('xdr:wsDr');
        $objWriter->writeAttribute('xmlns:xdr', 'http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing');
        $objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');

        // Loop through images and write drawings
        $i = 1;
        $iterator = $pWorksheet->getDrawingCollection()->getIterator();
        while ($iterator->valid()) {
            $this->writeDrawing($objWriter, $iterator->current(), $i);

            $iterator->next();
            ++$i;
        }

        if ($includeCharts) {
            $chartCount = $pWorksheet->getChartCount();
            // Loop through charts and write the chart position
            if ($chartCount > 0) {
                for ($c = 0; $c < $chartCount; ++$c) {
                    $this->writeChart($objWriter, $pWorksheet->getChartByIndex($c), $c+$i);
                }
            }
        }

        $objWriter->endElement();

        // Return
        return $objWriter->getData();
    }

    /**
     * Write drawings to XML format
     *
     * @param     PHPExcel_Shared_XMLWriter    $objWriter         XML Writer
     * @param     PHPExcel_Chart                $pChart
     * @param     int                            $pRelationId
     * @throws     PHPExcel_Writer_Exception
     */
    public function writeChart(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Chart $pChart = null, $pRelationId = -1)
    {
        $tl = $pChart->getTopLeftPosition();
        $tl['colRow'] = PHPExcel_Cell::coordinateFromString($tl['cell']);
        $br = $pChart->getBottomRightPosition();
        $br['colRow'] = PHPExcel_Cell::coordinateFromString($br['cell']);

        $objWriter->startElement('xdr:twoCellAnchor');

            $objWriter->startElement('xdr:from');
                $objWriter->writeElement('xdr:col', PHPExcel_Cell::columnIndexFromString($tl['colRow'][0]) - 1);
                $objWriter->writeElement('xdr:colOff', PHPExcel_Shared_Drawing::pixelsToEMU($tl['xOffset']));
                $objWriter->writeElement('xdr:row', $tl['colRow'][1] - 1);
                $objWriter->writeElement('xdr:rowOff', PHPExcel_Shared_Drawing::pixelsToEMU($tl['yOffset']));
            $objWriter->endElement();
            $objWriter->startElement('xdr:to');
                $objWriter->writeElement('xdr:col', PHPExcel_Cell::columnIndexFromString($br['colRow'][0]) - 1...