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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 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 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */


/**
 * PHPExcel_Writer_Excel2007_Chart
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPart
{
        /**
         * Write charts to XML format
         *
         * @param       PHPExcel_Chart                          $pChart
         * @return      string                                          XML Output
         * @throws      PHPExcel_Writer_Exception
         */
        public function writeChart(PHPExcel_Chart $pChart = null)
        {
                // 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);
                }
                //      Ensure that data series values are up-to-date before we save
                $pChart->refresh();

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

                // c:chartSpace
                $objWriter->startElement('c:chartSpace');
                        $objWriter->writeAttribute('xmlns:c', 'http://schemas.openxmlformats.org/drawingml/2006/chart');
                        $objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');
                        $objWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');

                        $objWriter->startElement('c:date1904');
                                $objWriter->writeAttribute('val', 0);
                        $objWriter->endElement();
                        $objWriter->startElement('c:lang');
                                $objWriter->writeAttribute('val', "en-GB");
                        $objWriter->endElement();
                        $objWriter->startElement('c:roundedCorners');
                                $objWriter->writeAttribute('val', 0);
                        $objWriter->endElement();

                        $this->_writeAlternateContent($objWriter);

                        $objWriter->startElement('c:chart');

                                $this->_writeTitle($pChart->getTitle(), $objWriter);

                                $objWriter->startElement('c:autoTitleDeleted');
                                        $objWriter->writeAttribute('val', 0);
                                $objWriter->endElement();

                                $this->_writePlotArea($pChart->getPlotArea(),
                                                                          $pChart->getXAxisLabel(),
                                                                          $pChart->getYAxisLabel(),
                                                                          $objWriter,
                                                                          $pChart->getWorksheet()
                                                                         );

                                $this->_writeLegend($pChart->getLegend(), $objWriter);


                                $objWriter->startElement('c:plotVisOnly');
                                        $objWriter->writeAttribute('val', 1);
                                $objWriter->endElement();

                                $objWriter->startElement('c:dispBlanksAs');
                                        $objWriter->writeAttribute('val', "gap");
                                $objWriter->endElement();

                                $objWriter->startElement('c:showDLblsOverMax');
                                        $objWriter->writeAttribute('val', 0);
                                $objWriter->endElement();

                        $objWriter->endElement();

                        $this->_writePrintSettings($objWriter);

                $objWriter->endElement();

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

        /**
         * Write Chart Title
         *
         * @param       PHPExcel_Chart_Title            $title
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeTitle(PHPExcel_Chart_Title $title = null, $objWriter)
        {
                if (is_null($title)) {
                        return;
                }

                $objWriter->startElement('c:title');
                        $objWriter->startElement('c:tx');
                                $objWriter->startElement('c:rich');

                                        $objWriter->startElement('a:bodyPr');
                                        $objWriter->endElement();

                                        $objWriter->startElement('a:lstStyle');
                                        $objWriter->endElement();

                                        $objWriter->startElement('a:p');

                                                $caption = $title->getCaption();
                                                if ((is_array($caption)) && (count($caption) > 0))
                                                        $caption = $caption[0];
                                                $this->getParentWriter()->getWriterPart('stringtable')->writeRichTextForCharts($objWriter, $caption, 'a');

                                        $objWriter->endElement();
                                $objWriter->endElement();
                        $objWriter->endElement();

                        $layout = $title->getLayout();
                        $this->_writeLayout($layout, $objWriter);

                        $objWriter->startElement('c:overlay');
                                $objWriter->writeAttribute('val', 0);
                        $objWriter->endElement();

                $objWriter->endElement();
        }

        /**
         * Write Chart Legend
         *
         * @param       PHPExcel_Chart_Legend           $legend
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeLegend(PHPExcel_Chart_Legend $legend = null, $objWriter)
        {
                if (is_null($legend)) {
                        return;
                }

                $objWriter->startElement('c:legend');

                        $objWriter->startElement('c:legendPos');
                                $objWriter->writeAttribute('val', $legend->getPosition());
                        $objWriter->endElement();

                        $layout = $legend->getLayout();
                        $this->_writeLayout($layout, $objWriter);

                        $objWriter->startElement('c:overlay');
                                $objWriter->writeAttribute('val', ($legend->getOverlay()) ? '1' : '0');
                        $objWriter->endElement();

                        $objWriter->startElement('c:txPr');
                                $objWriter->startElement('a:bodyPr');
                                $objWriter->endElement();

                                $objWriter->startElement('a:lstStyle');
                                $objWriter->endElement();

                                $objWriter->startElement('a:p');
                                        $objWriter->startElement('a:pPr');
                                                $objWriter->writeAttribute('rtl', 0);

                                                $objWriter->startElement('a:defRPr');
                                                $objWriter->endElement();
                                        $objWriter->endElement();

                                        $objWriter->startElement('a:endParaRPr');
                                                $objWriter->writeAttribute('lang', "en-US");
                                        $objWriter->endElement();

                                $objWriter->endElement();
                        $objWriter->endElement();

                $objWriter->endElement();
        }

        /**
         * Write Chart Plot Area
         *
         * @param       PHPExcel_Chart_PlotArea         $plotArea
         * @param       PHPExcel_Chart_Title            $xAxisLabel
         * @param       PHPExcel_Chart_Title            $yAxisLabel
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writePlotArea(PHPExcel_Chart_PlotArea $plotArea,
                                                                        PHPExcel_Chart_Title $xAxisLabel = NULL,
                                                                        PHPExcel_Chart_Title $yAxisLabel = NULL,
                                                                        $objWriter,
                                                                        PHPExcel_Worksheet $pSheet)
        {
                if (is_null($plotArea)) {
                        return;
                }

                $id1 = $id2 = 0;
                $this->_seriesIndex = 0;
                $objWriter->startElement('c:plotArea');

                        $layout = $plotArea->getLayout();

                        $this->_writeLayout($layout, $objWriter);

                        $chartTypes = self::_getChartType($plotArea);
                        $catIsMultiLevelSeries = $valIsMultiLevelSeries = FALSE;
                        $plotGroupingType = '';
                        foreach($chartTypes as $chartType) {
                                $objWriter->startElement('c:'.$chartType);

                                        $groupCount = $plotArea->getPlotGroupCount();
                                        for($i = 0; $i < $groupCount; ++$i) {
                                                $plotGroup = $plotArea->getPlotGroupByIndex($i);
                                                $groupType = $plotGroup->getPlotType();
                                                if ($groupType == $chartType) {

                                                        $plotStyle = $plotGroup->getPlotStyle();
                                                        if ($groupType === PHPExcel_Chart_DataSeries::TYPE_RADARCHART) {
                                                                $objWriter->startElement('c:radarStyle');
                                                                        $objWriter->writeAttribute('val', $plotStyle );
                                                                $objWriter->endElement();
                                                        } elseif ($groupType === PHPExcel_Chart_DataSeries::TYPE_SCATTERCHART) {
                                                                $objWriter->startElement('c:scatterStyle');
                                                                        $objWriter->writeAttribute('val', $plotStyle );
                                                                $objWriter->endElement();
                                                        }

                                                        $this->_writePlotGroup($plotGroup, $chartType, $objWriter, $catIsMultiLevelSeries, $valIsMultiLevelSeries, $plotGroupingType, $pSheet);
                                                }
                                        }

                                        $this->_writeDataLbls($objWriter, $layout);

                                        if ($chartType === PHPExcel_Chart_DataSeries::TYPE_LINECHART) {
                                                //      Line only, Line3D can't be smoothed

                                                $objWriter->startElement('c:smooth');
                                                        $objWriter->writeAttribute('val', (integer) $plotGroup->getSmoothLine() );
                                                $objWriter->endElement();
                                        } elseif (($chartType === PHPExcel_Chart_DataSeries::TYPE_BARCHART) ||
                                                ($chartType === PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D)) {

                                                $objWriter->startElement('c:gapWidth');
                                                        $objWriter->writeAttribute('val', 150 );
                                                $objWriter->endElement();

                                                if ($plotGroupingType == 'percentStacked' ||
                                                        $plotGroupingType == 'stacked') {

                                                        $objWriter->startElement('c:overlap');
                                                                $objWriter->writeAttribute('val', 100 );
                                                        $objWriter->endElement();
                                                }
                                        } elseif ($chartType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) {

                                                        $objWriter->startElement('c:bubbleScale');
                                                                $objWriter->writeAttribute('val', 25 );
                                                        $objWriter->endElement();

                                                        $objWriter->startElement('c:showNegBubbles');
                                                                $objWriter->writeAttribute('val', 0 );
                                                        $objWriter->endElement();
                                        } elseif ($chartType === PHPExcel_Chart_DataSeries::TYPE_STOCKCHART) {

                                                        $objWriter->startElement('c:hiLowLines');
                                                        $objWriter->endElement();
                                        }

                                        //      Generate 2 unique numbers to use for axId values
//                                      $id1 = $id2 = rand(10000000,99999999);
//                                      do {
//                                              $id2 = rand(10000000,99999999);
//                                      } while ($id1 == $id2);
                                        $id1 = '75091328';
                                        $id2 = '75089408';

                                        if (($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART) &&
                                                ($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) &&
                                                ($chartType !== PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)) {

                                                $objWriter->startElement('c:axId');
                                                        $objWriter->writeAttribute('val', $id1 );
                                                $objWriter->endElement();
                                                $objWriter->startElement('c:axId');
                                                        $objWriter->writeAttribute('val', $id2 );
                                                $objWriter->endElement();
                                        } else {
                                                $objWriter->startElement('c:firstSliceAng');
                                                        $objWriter->writeAttribute('val', 0);
                                                $objWriter->endElement();

                                                if ($chartType === PHPExcel_Chart_DataSeries::TYPE_DONUTCHART) {

                                                        $objWriter->startElement('c:holeSize');
                                                                $objWriter->writeAttribute('val', 50);
                                                        $objWriter->endElement();
                                                }
                                        }

                                $objWriter->endElement();
                        }

                        if (($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART) &&
                                ($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) &&
                                ($chartType !== PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)) {

                                if ($chartType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) {
                                        $this->_writeValAx($objWriter,$plotArea,$xAxisLabel,$chartType,$id1,$id2,$catIsMultiLevelSeries);
                                } else {
                                        $this->_writeCatAx($objWriter,$plotArea,$xAxisLabel,$chartType,$id1,$id2,$catIsMultiLevelSeries);
                                }

                                $this->_writeValAx($objWriter,$plotArea,$yAxisLabel,$chartType,$id1,$id2,$valIsMultiLevelSeries);
                        }

                $objWriter->endElement();
        }

        /**
         * Write Data Labels
         *
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @param       PHPExcel_Chart_Layout           $chartLayout    Chart layout
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeDataLbls($objWriter, $chartLayout)
        {
                $objWriter->startElement('c:dLbls');

                        $objWriter->startElement('c:showLegendKey');
                                $showLegendKey = (empty($chartLayout)) ? 0 : $chartLayout->getShowLegendKey();
                                $objWriter->writeAttribute('val', ((empty($showLegendKey)) ? 0 : 1) );
                        $objWriter->endElement();


                        $objWriter->startElement('c:showVal');
                                $showVal = (empty($chartLayout)) ? 0 : $chartLayout->getShowVal();
                                $objWriter->writeAttribute('val', ((empty($showVal)) ? 0 : 1) );
                        $objWriter->endElement();

                        $objWriter->startElement('c:showCatName');
                                $showCatName = (empty($chartLayout)) ? 0 : $chartLayout->getShowCatName();
                                $objWriter->writeAttribute('val', ((empty($showCatName)) ? 0 : 1) );
                        $objWriter->endElement();

                        $objWriter->startElement('c:showSerName');
                                $showSerName = (empty($chartLayout)) ? 0 : $chartLayout->getShowSerName();
                                $objWriter->writeAttribute('val', ((empty($showSerName)) ? 0 : 1) );
                        $objWriter->endElement();

                        $objWriter->startElement('c:showPercent');
                                $showPercent = (empty($chartLayout)) ? 0 : $chartLayout->getShowPercent();
                                $objWriter->writeAttribute('val', ((empty($showPercent)) ? 0 : 1) );
                        $objWriter->endElement();

                        $objWriter->startElement('c:showBubbleSize');
                                $showBubbleSize = (empty($chartLayout)) ? 0 : $chartLayout->getShowBubbleSize();
                                $objWriter->writeAttribute('val', ((empty($showBubbleSize)) ? 0 : 1) );
                        $objWriter->endElement();

                        $objWriter->startElement('c:showLeaderLines');
                                $showLeaderLines = (empty($chartLayout)) ? 1 : $chartLayout->getShowLeaderLines();
                                $objWriter->writeAttribute('val', ((empty($showLeaderLines)) ? 0 : 1) );
                        $objWriter->endElement();

                $objWriter->endElement();
        }

        /**
         * Write Category Axis
         *
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @param       PHPExcel_Chart_PlotArea         $plotArea
         * @param       PHPExcel_Chart_Title            $xAxisLabel
         * @param       string                                          $groupType              Chart type
         * @param       string                                          $id1
         * @param       string                                          $id2
         * @param       boolean                                         $isMultiLevelSeries
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeCatAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $xAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries)
        {
                $objWriter->startElement('c:catAx');

                        if ($id1 > 0) {
                                $objWriter->startElement('c:axId');
                                        $objWriter->writeAttribute('val', $id1);
                                $objWriter->endElement();
                        }

                        $objWriter->startElement('c:scaling');
                                $objWriter->startElement('c:orientation');
                                        $objWriter->writeAttribute('val', "minMax");
                                $objWriter->endElement();
                        $objWriter->endElement();

                        $objWriter->startElement('c:delete');
                                $objWriter->writeAttribute('val', 0);
                        $objWriter->endElement();

                        $objWriter->startElement('c:axPos');
                                $objWriter->writeAttribute('val', "b");
                        $objWriter->endElement();

                        if (!is_null($xAxisLabel)) {
                                $objWriter->startElement('c:title');
                                        $objWriter->startElement('c:tx');
                                                $objWriter->startElement('c:rich');

                                                        $objWriter->startElement('a:bodyPr');
                                                        $objWriter->endElement();

                                                        $objWriter->startElement('a:lstStyle');
                                                        $objWriter->endElement();

                                                        $objWriter->startElement('a:p');
                                                                $objWriter->startElement('a:r');

                                                                        $caption = $xAxisLabel->getCaption();
                                                                        if (is_array($caption))
                                                                                $caption = $caption[0];
                                                                        $objWriter->startElement('a:t');
//                                                                              $objWriter->writeAttribute('xml:space', 'preserve');
                                                                                $objWriter->writeRawData(PHPExcel_Shared_String::ControlCharacterPHP2OOXML( $caption ));
                                                                        $objWriter->endElement();

                                                                $objWriter->endElement();
                                                        $objWriter->endElement();
                                                $objWriter->endElement();
                                        $objWriter->endElement();

                                        $layout = $xAxisLabel->getLayout();
                                        $this->_writeLayout($layout, $objWriter);

                                        $objWriter->startElement('c:overlay');
                                                $objWriter->writeAttribute('val', 0);
                                        $objWriter->endElement();

                                $objWriter->endElement();

                        }

                        $objWriter->startElement('c:numFmt');
                                $objWriter->writeAttribute('formatCode', "General");
                                $objWriter->writeAttribute('sourceLinked', 1);
                        $objWriter->endElement();

                        $objWriter->startElement('c:majorTickMark');
                                $objWriter->writeAttribute('val', "out");
                        $objWriter->endElement();

                        $objWriter->startElement('c:minorTickMark');
                                $objWriter->writeAttribute('val', "none");
                        $objWriter->endElement();

                        $objWriter->startElement('c:tickLblPos');
                                $objWriter->writeAttribute('val', "nextTo");
                        $objWriter->endElement();

                        if ($id2 > 0) {
                                        $objWriter->startElement('c:crossAx');
                                                $objWriter->writeAttribute('val', $id2);
                                        $objWriter->endElement();

                                        $objWriter->startElement('c:crosses');
                                                $objWriter->writeAttribute('val', "autoZero");
                                        $objWriter->endElement();
                        }

                        $objWriter->startElement('c:auto');
                                $objWriter->writeAttribute('val', 1);
                        $objWriter->endElement();

                        $objWriter->startElement('c:lblAlgn');
                                $objWriter->writeAttribute('val', "ctr");
                        $objWriter->endElement();

                        $objWriter->startElement('c:lblOffset');
                                $objWriter->writeAttribute('val', 100);
                        $objWriter->endElement();

                        if ($isMultiLevelSeries) {
                                $objWriter->startElement('c:noMultiLvlLbl');
                                        $objWriter->writeAttribute('val', 0);
                                $objWriter->endElement();
                        }
                $objWriter->endElement();

        }


        /**
         * Write Value Axis
         *
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @param       PHPExcel_Chart_PlotArea         $plotArea
         * @param       PHPExcel_Chart_Title            $yAxisLabel
         * @param       string                                          $groupType              Chart type
         * @param       string                                          $id1
         * @param       string                                          $id2
         * @param       boolean                                         $isMultiLevelSeries
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeValAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $yAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries)
        {
                $objWriter->startElement('c:valAx');

                        if ($id2 > 0) {
                                $objWriter->startElement('c:axId');
                                        $objWriter->writeAttribute('val', $id2);
                                $objWriter->endElement();
                        }

                        $objWriter->startElement('c:scaling');
                                $objWriter->startElement('c:orientation');
                                        $objWriter->writeAttribute('val', "minMax");
                                $objWriter->endElement();
                        $objWriter->endElement();

                        $objWriter->startElement('c:delete');
                                $objWriter->writeAttribute('val', 0);
                        $objWriter->endElement();

                        $objWriter->startElement('c:axPos');
                                $objWriter->writeAttribute('val', "l");
                        $objWriter->endElement();

                        $objWriter->startElement('c:majorGridlines');
                        $objWriter->endElement();

                        if (!is_null($yAxisLabel)) {
                                $objWriter->startElement('c:title');
                                        $objWriter->startElement('c:tx');
                                                $objWriter->startElement('c:rich');

                                                        $objWriter->startElement('a:bodyPr');
                                                        $objWriter->endElement();

                                                        $objWriter->startElement('a:lstStyle');
                                                        $objWriter->endElement();

                                                        $objWriter->startElement('a:p');
                                                                $objWriter->startElement('a:r');

                                                                        $caption = $yAxisLabel->getCaption();
                                                                        if (is_array($caption))
                                                                                $caption = $caption[0];
                                                                        $objWriter->startElement('a:t');
//                                                                              $objWriter->writeAttribute('xml:space', 'preserve');
                                                                                $objWriter->writeRawData(PHPExcel_Shared_String::ControlCharacterPHP2OOXML( $caption ));
                                                                        $objWriter->endElement();

                                                                $objWriter->endElement();
                                                        $objWriter->endElement();
                                                $objWriter->endElement();
                                        $objWriter->endElement();

                                        if ($groupType !== PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) {
                                                $layout = $yAxisLabel->getLayout();
                                                $this->_writeLayout($layout, $objWriter);
                                        }

                                        $objWriter->startElement('c:overlay');
                                                $objWriter->writeAttribute('val', 0);
                                        $objWriter->endElement();

                                $objWriter->endElement();
                        }

                        $objWriter->startElement('c:numFmt');
                                $objWriter->writeAttribute('formatCode', "General");
                                $objWriter->writeAttribute('sourceLinked', 1);
                        $objWriter->endElement();

                        $objWriter->startElement('c:majorTickMark');
                                $objWriter->writeAttribute('val', "out");
                        $objWriter->endElement();

                        $objWriter->startElement('c:minorTickMark');
                                $objWriter->writeAttribute('val', "none");
                        $objWriter->endElement();

                        $objWriter->startElement('c:tickLblPos');
                                $objWriter->writeAttribute('val', "nextTo");
                        $objWriter->endElement();

                        if ($id1 > 0) {
                                        $objWriter->startElement('c:crossAx');
                                                $objWriter->writeAttribute('val', $id2);
                                        $objWriter->endElement();

                                        $objWriter->startElement('c:crosses');
                                                $objWriter->writeAttribute('val', "autoZero");
                                        $objWriter->endElement();

                                        $objWriter->startElement('c:crossBetween');
                                                $objWriter->writeAttribute('val', "midCat");
                                        $objWriter->endElement();
                        }

                        if ($isMultiLevelSeries) {
                                if ($groupType !== PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) {
                                        $objWriter->startElement('c:noMultiLvlLbl');
                                                $objWriter->writeAttribute('val', 0);
                                        $objWriter->endElement();
                                }
                        }
                $objWriter->endElement();

        }


        /**
         * Get the data series type(s) for a chart plot series
         *
         * @param       PHPExcel_Chart_PlotArea         $plotArea
         * @return      string|array
         * @throws      PHPExcel_Writer_Exception
         */
        private static function _getChartType($plotArea)
        {
                $groupCount = $plotArea->getPlotGroupCount();

                if ($groupCount == 1) {
                        $chartType = array($plotArea->getPlotGroupByIndex(0)->getPlotType());
                } else {
                        $chartTypes = array();
                        for($i = 0; $i < $groupCount; ++$i) {
                                $chartTypes[] = $plotArea->getPlotGroupByIndex($i)->getPlotType();
                        }
                        $chartType = array_unique($chartTypes);
                        if (count($chartTypes) == 0) {
                                throw new PHPExcel_Writer_Exception('Chart is not yet implemented');
                        }
                }

                return $chartType;
        }

        /**
         * Write Plot Group (series of related plots)
         *
         * @param       PHPExcel_Chart_DataSeries               $plotGroup
         * @param       string                                                  $groupType                              Type of plot for dataseries
         * @param       PHPExcel_Shared_XMLWriter               $objWriter                              XML Writer
         * @param       boolean                                                 &$catIsMultiLevelSeries Is category a multi-series category
         * @param       boolean                                                 &$valIsMultiLevelSeries Is value set a multi-series set
         * @param       string                                                  &$plotGroupingType              Type of grouping for multi-series values
         * @param       PHPExcel_Worksheet                              $pSheet
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writePlotGroup( $plotGroup,
                                                                          $groupType,
                                                                          $objWriter,
                                                                          &$catIsMultiLevelSeries,
                                                                          &$valIsMultiLevelSeries,
                                                                          &$plotGroupingType,
                                                                          PHPExcel_Worksheet $pSheet
                                                                        )
        {
                if (is_null($plotGroup)) {
                        return;
                }

                if (($groupType == PHPExcel_Chart_DataSeries::TYPE_BARCHART) ||
                        ($groupType == PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D)) {
                        $objWriter->startElement('c:barDir');
                                $objWriter->writeAttribute('val', $plotGroup->getPlotDirection());
                        $objWriter->endElement();
                }

                if (!is_null($plotGroup->getPlotGrouping())) {
                        $plotGroupingType = $plotGroup->getPlotGrouping();
                        $objWriter->startElement('c:grouping');
                                $objWriter->writeAttribute('val', $plotGroupingType);
                        $objWriter->endElement();
                }

                //      Get these details before the loop, because we can use the count to check for varyColors
                $plotSeriesOrder = $plotGroup->getPlotOrder();
                $plotSeriesCount = count($plotSeriesOrder);

                if (($groupType !== PHPExcel_Chart_DataSeries::TYPE_RADARCHART) &&
                        ($groupType !== PHPExcel_Chart_DataSeries::TYPE_STOCKCHART)) {

                        if ($groupType !== PHPExcel_Chart_DataSeries::TYPE_LINECHART) {
                                if (($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART) ||
                                        ($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) ||
                                        ($groupType == PHPExcel_Chart_DataSeries::TYPE_DONUTCHART) ||
                                        ($plotSeriesCount > 1)) {
                                        $objWriter->startElement('c:varyColors');
                                                $objWriter->writeAttribute('val', 1);
                                        $objWriter->endElement();
                                } else {
                                        $objWriter->startElement('c:varyColors');
                                                $objWriter->writeAttribute('val', 0);
                                        $objWriter->endElement();
                                }
                        }
                }

                foreach($plotSeriesOrder as $plotSeriesIdx => $plotSeriesRef) {
                        $objWriter->startElement('c:ser');

                                $objWriter->startElement('c:idx');
                                        $objWriter->writeAttribute('val', $this->_seriesIndex + $plotSeriesIdx);
                                $objWriter->endElement();

                                $objWriter->startElement('c:order');
                                        $objWriter->writeAttribute('val', $this->_seriesIndex + $plotSeriesRef);
                                $objWriter->endElement();

                                if (($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART) ||
                                        ($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) ||
                                        ($groupType == PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)) {

                                        $objWriter->startElement('c:dPt');
                                                $objWriter->startElement('c:idx');
                                                        $objWriter->writeAttribute('val', 3);
                                                $objWriter->endElement();

                                                $objWriter->startElement('c:bubble3D');
                                                        $objWriter->writeAttribute('val', 0);
                                                $objWriter->endElement();

                                                $objWriter->startElement('c:spPr');
                                                        $objWriter->startElement('a:solidFill');
                                                                $objWriter->startElement('a:srgbClr');
                                                                        $objWriter->writeAttribute('val', 'FF9900');
                                                                $objWriter->endElement();
                                                        $objWriter->endElement();
                                                $objWriter->endElement();
                                        $objWriter->endElement();
                                }

                                //      Labels
                                $plotSeriesLabel = $plotGroup->getPlotLabelByIndex($plotSeriesRef);
                                if ($plotSeriesLabel && ($plotSeriesLabel->getPointCount() > 0)) {
                                        $objWriter->startElement('c:tx');
                                                $objWriter->startElement('c:strRef');
                                                        $this->_writePlotSeriesLabel($plotSeriesLabel, $objWriter);
                                                $objWriter->endElement();
                                        $objWriter->endElement();
                                }

                                //      Formatting for the points
                                if ($groupType == PHPExcel_Chart_DataSeries::TYPE_LINECHART) {
                                        $objWriter->startElement('c:spPr');
                                                $objWriter->startElement('a:ln');
                                                        $objWriter->writeAttribute('w', 12700);
                                                $objWriter->endElement();
                                        $objWriter->endElement();
                                }

                                $plotSeriesValues = $plotGroup->getPlotValuesByIndex($plotSeriesRef);
                                if ($plotSeriesValues) {
                                        $plotSeriesMarker = $plotSeriesValues->getPointMarker();
                                        if ($plotSeriesMarker) {
                                                $objWriter->startElement('c:marker');
                                                        $objWriter->startElement('c:symbol');
                                                                $objWriter->writeAttribute('val', $plotSeriesMarker);
                                                        $objWriter->endElement();

                                                        if ($plotSeriesMarker !== 'none') {
                                                                $objWriter->startElement('c:size');
                                                                        $objWriter->writeAttribute('val', 3);
                                                                $objWriter->endElement();
                                                        }
                                                $objWriter->endElement();
                                        }
                                }

                                if (($groupType === PHPExcel_Chart_DataSeries::TYPE_BARCHART) ||
                                        ($groupType === PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D) ||
                                        ($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART)) {

                                        $objWriter->startElement('c:invertIfNegative');
                                                $objWriter->writeAttribute('val', 0);
                                        $objWriter->endElement();
                                }

                                //      Category Labels
                                $plotSeriesCategory = $plotGroup->getPlotCategoryByIndex($plotSeriesRef);
                                if ($plotSeriesCategory && ($plotSeriesCategory->getPointCount() > 0)) {
                                        $catIsMultiLevelSeries = $catIsMultiLevelSeries || $plotSeriesCategory->isMultiLevelSeries();

                                        if (($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART) ||
                                                ($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) ||
                                                ($groupType == PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)) {

                                                if (!is_null($plotGroup->getPlotStyle())) {
                                                        $plotStyle = $plotGroup->getPlotStyle();
                                                        if ($plotStyle) {
                                                                $objWriter->startElement('c:explosion');
                                                                        $objWriter->writeAttribute('val', 25);
                                                                $objWriter->endElement();
                                                        }
                                                }
                                        }

                                        if (($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) ||
                                                ($groupType === PHPExcel_Chart_DataSeries::TYPE_SCATTERCHART)) {
                                                $objWriter->startElement('c:xVal');
                                        } else {
                                                $objWriter->startElement('c:cat');
                                        }

                                                $this->_writePlotSeriesValues($plotSeriesCategory, $objWriter, $groupType, 'str', $pSheet);
                                        $objWriter->endElement();
                                }

                                //      Values
                                if ($plotSeriesValues) {
                                        $valIsMultiLevelSeries = $valIsMultiLevelSeries || $plotSeriesValues->isMultiLevelSeries();

                                        if (($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) ||
                                                ($groupType === PHPExcel_Chart_DataSeries::TYPE_SCATTERCHART)) {
                                                $objWriter->startElement('c:yVal');
                                        } else {
                                                $objWriter->startElement('c:val');
                                        }

                                                $this->_writePlotSeriesValues($plotSeriesValues, $objWriter, $groupType, 'num', $pSheet);
                                        $objWriter->endElement();
                                }

                                if ($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) {
                                        $this->_writeBubbles($plotSeriesValues, $objWriter, $pSheet);
                                }

                        $objWriter->endElement();

                }

                $this->_seriesIndex += $plotSeriesIdx + 1;
        }

        /**
         * Write Plot Series Label
         *
         * @param       PHPExcel_Chart_DataSeriesValues         $plotSeriesLabel
         * @param       PHPExcel_Shared_XMLWriter                       $objWriter                      XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writePlotSeriesLabel($plotSeriesLabel, $objWriter)
        {
                if (is_null($plotSeriesLabel)) {
                        return;
                }

                $objWriter->startElement('c:f');
                        $objWriter->writeRawData($plotSeriesLabel->getDataSource());
                $objWriter->endElement();

                $objWriter->startElement('c:strCache');
                        $objWriter->startElement('c:ptCount');
                                $objWriter->writeAttribute('val', $plotSeriesLabel->getPointCount() );
                        $objWriter->endElement();

                        foreach($plotSeriesLabel->getDataValues() as $plotLabelKey => $plotLabelValue) {
                                $objWriter->startElement('c:pt');
                                        $objWriter->writeAttribute('idx', $plotLabelKey );

                                        $objWriter->startElement('c:v');
                                                $objWriter->writeRawData( $plotLabelValue );
                                        $objWriter->endElement();
                                $objWriter->endElement();
                        }
                $objWriter->endElement();

        }

        /**
         * Write Plot Series Values
         *
         * @param       PHPExcel_Chart_DataSeriesValues         $plotSeriesValues
         * @param       PHPExcel_Shared_XMLWriter                       $objWriter                      XML Writer
         * @param       string                                                          $groupType                      Type of plot for dataseries
         * @param       string                                                          $dataType                       Datatype of series values
         * @param       PHPExcel_Worksheet                                      $pSheet
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writePlotSeriesValues( $plotSeriesValues,
                                                                                         $objWriter,
                                                                                         $groupType,
                                                                                         $dataType='str',
                                                                                         PHPExcel_Worksheet $pSheet
                                                                                   )
        {
                if (is_null($plotSeriesValues)) {
                        return;
                }

                if ($plotSeriesValues->isMultiLevelSeries()) {
                        $levelCount = $plotSeriesValues->multiLevelCount();

                        $objWriter->startElement('c:multiLvlStrRef');

                                $objWriter->startElement('c:f');
                                        $objWriter->writeRawData( $plotSeriesValues->getDataSource() );
                                $objWriter->endElement();

                                $objWriter->startElement('c:multiLvlStrCache');

                                        $objWriter->startElement('c:ptCount');
                                                $objWriter->writeAttribute('val', $plotSeriesValues->getPointCount() );
                                        $objWriter->endElement();

                                        for ($level = 0; $level < $levelCount; ++$level) {
                                                $objWriter->startElement('c:lvl');

                                                foreach($plotSeriesValues->getDataValues() as $plotSeriesKey => $plotSeriesValue) {
                                                        if (isset($plotSeriesValue[$level])) {
                                                                $objWriter->startElement('c:pt');
                                                                        $objWriter->writeAttribute('idx', $plotSeriesKey );

                                                                        $objWriter->startElement('c:v');
                                                                                $objWriter->writeRawData( $plotSeriesValue[$level] );
                                                                        $objWriter->endElement();
                                                                $objWriter->endElement();
                                                        }
                                                }

                                                $objWriter->endElement();
                                        }

                                $objWriter->endElement();

                        $objWriter->endElement();
                } else {
                        $objWriter->startElement('c:'.$dataType.'Ref');

                                $objWriter->startElement('c:f');
                                        $objWriter->writeRawData( $plotSeriesValues->getDataSource() );
                                $objWriter->endElement();

                                $objWriter->startElement('c:'.$dataType.'Cache');

                                        if (($groupType != PHPExcel_Chart_DataSeries::TYPE_PIECHART) &&
                                                ($groupType != PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) &&
                                                ($groupType != PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)) {

                                                if (($plotSeriesValues->getFormatCode() !== NULL) &&
                                                        ($plotSeriesValues->getFormatCode() !== '')) {
                                                        $objWriter->startElement('c:formatCode');
                                                                $objWriter->writeRawData( $plotSeriesValues->getFormatCode() );
                                                        $objWriter->endElement();
                                                }
                                        }

                                        $objWriter->startElement('c:ptCount');
                                                $objWriter->writeAttribute('val', $plotSeriesValues->getPointCount() );
                                        $objWriter->endElement();

                                        $dataValues = $plotSeriesValues->getDataValues();
                                        if (!empty($dataValues)) {
                                                if (is_array($dataValues)) {
                                                        foreach($dataValues as $plotSeriesKey => $plotSeriesValue) {
                                                                $objWriter->startElement('c:pt');
                                                                        $objWriter->writeAttribute('idx', $plotSeriesKey );

                                                                        $objWriter->startElement('c:v');
                                                                                $objWriter->writeRawData( $plotSeriesValue );
                                                                        $objWriter->endElement();
                                                                $objWriter->endElement();
                                                        }
                                                }
                                        }

                                $objWriter->endElement();

                        $objWriter->endElement();
                }
        }

        /**
         * Write Bubble Chart Details
         *
         * @param       PHPExcel_Chart_DataSeriesValues         $plotSeriesValues
         * @param       PHPExcel_Shared_XMLWriter                       $objWriter                      XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeBubbles($plotSeriesValues, $objWriter, PHPExcel_Worksheet $pSheet)
        {
                if (is_null($plotSeriesValues)) {
                        return;
                }

                $objWriter->startElement('c:bubbleSize');
                        $objWriter->startElement('c:numLit');

                                $objWriter->startElement('c:formatCode');
                                        $objWriter->writeRawData( 'General' );
                                $objWriter->endElement();

                                $objWriter->startElement('c:ptCount');
                                        $objWriter->writeAttribute('val', $plotSeriesValues->getPointCount() );
                                $objWriter->endElement();

                                $dataValues = $plotSeriesValues->getDataValues();
                                if (!empty($dataValues)) {
                                        if (is_array($dataValues)) {
                                                foreach($dataValues as $plotSeriesKey => $plotSeriesValue) {
                                                        $objWriter->startElement('c:pt');
                                                                $objWriter->writeAttribute('idx', $plotSeriesKey );
                                                                $objWriter->startElement('c:v');
                                                                        $objWriter->writeRawData( 1 );
                                                                $objWriter->endElement();
                                                        $objWriter->endElement();
                                                }
                                        }
                                }

                        $objWriter->endElement();
                $objWriter->endElement();

                $objWriter->startElement('c:bubble3D');
                        $objWriter->writeAttribute('val', 0 );
                $objWriter->endElement();
        }

        /**
         * Write Layout
         *
         * @param       PHPExcel_Chart_Layout           $layout
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeLayout(PHPExcel_Chart_Layout $layout = NULL, $objWriter)
        {
                $objWriter->startElement('c:layout');

                        if (!is_null($layout)) {
                                $objWriter->startElement('c:manualLayout');

                                        $layoutTarget = $layout->getLayoutTarget();
                                        if (!is_null($layoutTarget)) {
                                                $objWriter->startElement('c:layoutTarget');
                                                        $objWriter->writeAttribute('val', $layoutTarget);
                                                $objWriter->endElement();
                                        }

                                        $xMode = $layout->getXMode();
                                        if (!is_null($xMode)) {
                                                $objWriter->startElement('c:xMode');
                                                        $objWriter->writeAttribute('val', $xMode);
                                                $objWriter->endElement();
                                        }

                                        $yMode = $layout->getYMode();
                                        if (!is_null($yMode)) {
                                                $objWriter->startElement('c:yMode');
                                                        $objWriter->writeAttribute('val', $yMode);
                                                $objWriter->endElement();
                                        }

                                        $x = $layout->getXPosition();
                                        if (!is_null($x)) {
                                                $objWriter->startElement('c:x');
                                                        $objWriter->writeAttribute('val', $x);
                                                $objWriter->endElement();
                                        }

                                        $y = $layout->getYPosition();
                                        if (!is_null($y)) {
                                                $objWriter->startElement('c:y');
                                                        $objWriter->writeAttribute('val', $y);
                                                $objWriter->endElement();
                                        }

                                        $w = $layout->getWidth();
                                        if (!is_null($w)) {
                                                $objWriter->startElement('c:w');
                                                        $objWriter->writeAttribute('val', $w);
                                                $objWriter->endElement();
                                        }

                                        $h = $layout->getHeight();
                                        if (!is_null($h)) {
                                                $objWriter->startElement('c:h');
                                                        $objWriter->writeAttribute('val', $h);
                                                $objWriter->endElement();
                                        }

                                $objWriter->endElement();
                        }

                $objWriter->endElement();
        }

        /**
         * Write Alternate Content block
         *
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writeAlternateContent($objWriter)
        {
                $objWriter->startElement('mc:AlternateContent');
                        $objWriter->writeAttribute('xmlns:mc', 'http://schemas.openxmlformats.org/markup-compatibility/2006');

                        $objWriter->startElement('mc:Choice');
                                $objWriter->writeAttribute('xmlns:c14', 'http://schemas.microsoft.com/office/drawing/2007/8/2/chart');
                                $objWriter->writeAttribute('Requires', 'c14');

                                $objWriter->startElement('c14:style');
                                        $objWriter->writeAttribute('val', '102');
                                $objWriter->endElement();
                        $objWriter->endElement();

                        $objWriter->startElement('mc:Fallback');
                                $objWriter->startElement('c:style');
                                        $objWriter->writeAttribute('val', '2');
                                $objWriter->endElement();
                        $objWriter->endElement();

                $objWriter->endElement();
        }

        /**
         * Write Printer Settings
         *
         * @param       PHPExcel_Shared_XMLWriter       $objWriter              XML Writer
         * @throws      PHPExcel_Writer_Exception
         */
        private function _writePrintSettings($objWriter)
        {
                $objWriter->startElement('c:printSettings');

                        $objWriter->startElement('c:headerFooter');
                        $objWriter->endElement();

                        $objWriter->startElement('c:pageMargins');
                                $objWriter->writeAttribute('footer', 0.3);
                                $objWriter->writeAttribute('header', 0.3);
                                $objWriter->writeAttribute('r', 0.7);
                                $objWriter->writeAttribute('l', 0.7);
                                $objWriter->writeAttribute('t', 0.75);
                                $objWriter->writeAttribute('b', 0.75);
                        $objWriter->endElement();

                        $objWriter->startElement('c:pageSetup');
                                $objWriter->writeAttribute('orientation', "portrait");
                        $objWriter->endElement();

                $objWriter->endElement();
        }

}