Chart.php

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<?php
class PHPExcel_Writer_Excel2007_Chart extends
  PHPExcel_Writer_Excel2007_WriterPart {

  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(),
        $pChart->getChartAxisX(),
        $pChart->getChartAxisY(),
        $pChart->getMajorGridlines(),
        $pChart->getMinorGridlines()
    );

    $this->_writeLegend($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();
  }

  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();
  }

  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();
  }

  private function _writePlotArea(PHPExcel_Chart_PlotArea $plotArea,
      PHPExcel_Chart_Title $xAxisLabel = NULL,
      PHPExcel_Chart_Title $yAxisLabel = NULL,
      $objWriter,
      PHPExcel_Worksheet $pSheet,
      PHPExcel_Chart_Axis $xAxis,
      PHPExcel_Chart_Axis $yAxis,
      PHPExcel_Chart_GridLines $majorGridlines,
      PHPExcel_Chart_GridLines $minorGridlines
  ) {
    if (is_null($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();

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

        $objWriter->startElement('c:gapWidth');
        $objWriter->writeAttribute('val', 300);
        $objWriter->endElement();

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

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

        $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, $xAxis, $yAxis, $majorGridlines, $minorGridlines);
      } else {
        $this->_writeCatAx($objWriter, $plotArea, $xAxisLabel, $chartType, $id1, $id2, $catIsMultiLevelSeries, $xAxis, $yAxis);
      }

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

    $objWriter->endElement();
  }

  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();
  }

  private function _writeCatAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $xAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries, $xAxis, $yAxis) {
    $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', $yAxis->getAxisOptionsProperty('orientation'));
    $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', $yAxis->getAxisNumberFormat());
    $objWriter->writeAttribute('sourceLinked', $yAxis->getAxisNumberSourceLinked());
    $objWriter->endElement();

    $objWriter->startElement('c:majorTickMark');
    $objWriter->writeAttribute('val', $yAxis->getAxisOptionsProperty('major_tick_mark'));
    $objWriter->endElement();

    $objWriter->startElement('c:minorTickMark');
    $objWriter->writeAttribute('val', $yAxis->getAxisOptionsProperty('minor_tick_mark'));
    $objWriter->endElement();

    $objWriter->startElement('c:tickLblPos');
    $objWriter->writeAttribute('val', $yAxis->getAxisOptionsProperty('axis_labels'));
    $objWriter->endElement();

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

      $objWriter->startElement('c:crosses');
      $objWriter->writeAttribute('val', $yAxis->getAxisOptionsProperty('horizontal_crosses'));
      $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();
  }

  private function _writeValAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $yAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries, $xAxis, $yAxis, $majorGridlines, $minorGridlines) {
    $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', $xAxis->getAxisOptionsProperty('orientation'));

    if (!is_null($xAxis->getAxisOptionsProperty('maximum'))) {
      $objWriter->startElement('c:max');
      $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('maximum'));
      $objWriter->endElement();
    }

    if (!is_null($xAxis->getAxisOptionsProperty('minimum'))) {
      $objWriter->startElement('c:min');
      $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('minimum'));
      $objWriter->endElement();
    }

    $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->startElement('c:spPr');

    if (!is_null($majorGridlines->getLineColorProperty('value'))) {
      $objWriter->startElement('a:ln');
      $objWriter->writeAttribute('w', $majorGridlines->getLineStyleProperty('width'));
      $objWriter->startElement('a:solidFill');
      $objWriter->startElement("a:{$majorGridlines->getLineColorProperty('type')}");
      $objWriter->writeAttribute('val', $majorGridlines->getLineColorProperty('value'));
      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $majorGridlines->getLineColorProperty('alpha'));
      $objWriter->endElement(); //end alpha
      $objWriter->endElement(); //end srgbClr
      $objWriter->endElement(); //end solidFill

      $objWriter->startElement('a:prstDash');
      $objWriter->writeAttribute('val', $majorGridlines->getLineStyleProperty('dash'));
      $objWriter->endElement();

      if ($majorGridlines->getLineStyleProperty('join') == 'miter') {
        $objWriter->startElement('a:miter');
        $objWriter->writeAttribute('lim', '800000');
        $objWriter->endElement();
      } else {
        $objWriter->startElement('a:bevel');
        $objWriter->endElement();
      }

      if (!is_null($majorGridlines->getLineStyleProperty(array('arrow', 'head', 'type')))) {
        $objWriter->startElement('a:headEnd');
        $objWriter->writeAttribute('type', $majorGridlines->getLineStyleProperty(array('arrow', 'head', 'type')));
        $objWriter->writeAttribute('w', $majorGridlines->getLineStyleArrowParameters('head', 'w'));
        $objWriter->writeAttribute('len', $majorGridlines->getLineStyleArrowParameters('head', 'len'));
        $objWriter->endElement();
      }

      if (!is_null($majorGridlines->getLineStyleProperty(array('arrow', 'end', 'type')))) {
        $objWriter->startElement('a:tailEnd');
        $objWriter->writeAttribute('type', $majorGridlines->getLineStyleProperty(array('arrow', 'end', 'type')));
        $objWriter->writeAttribute('w', $majorGridlines->getLineStyleArrowParameters('end', 'w'));
        $objWriter->writeAttribute('len', $majorGridlines->getLineStyleArrowParameters('end', 'len'));
        $objWriter->endElement();
      }
      $objWriter->endElement(); //end ln
    }
    $objWriter->startElement('a:effectLst');

    if (!is_null($majorGridlines->getGlowSize())) {
      $objWriter->startElement('a:glow');
      $objWriter->writeAttribute('rad', $majorGridlines->getGlowSize());
      $objWriter->startElement("a:{$majorGridlines->getGlowColor('type')}");
      $objWriter->writeAttribute('val', $majorGridlines->getGlowColor('value'));
      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $majorGridlines->getGlowColor('alpha'));
      $objWriter->endElement(); //end alpha
      $objWriter->endElement(); //end schemeClr
      $objWriter->endElement(); //end glow
    }

    if (!is_null($majorGridlines->getShadowProperty('presets'))) {
      $objWriter->startElement("a:{$majorGridlines->getShadowProperty('effect')}");
      if (!is_null($majorGridlines->getShadowProperty('blur'))) {
        $objWriter->writeAttribute('blurRad', $majorGridlines->getShadowProperty('blur'));
      }
      if (!is_null($majorGridlines->getShadowProperty('distance'))) {
        $objWriter->writeAttribute('dist', $majorGridlines->getShadowProperty('distance'));
      }
      if (!is_null($majorGridlines->getShadowProperty('direction'))) {
        $objWriter->writeAttribute('dir', $majorGridlines->getShadowProperty('direction'));
      }
      if (!is_null($majorGridlines->getShadowProperty('algn'))) {
        $objWriter->writeAttribute('algn', $majorGridlines->getShadowProperty('algn'));
      }
      if (!is_null($majorGridlines->getShadowProperty(array('size', 'sx')))) {
        $objWriter->writeAttribute('sx', $majorGridlines->getShadowProperty(array('size', 'sx')));
      }
      if (!is_null($majorGridlines->getShadowProperty(array('size', 'sy')))) {
        $objWriter->writeAttribute('sy', $majorGridlines->getShadowProperty(array('size', 'sy')));
      }
      if (!is_null($majorGridlines->getShadowProperty(array('size', 'kx')))) {
        $objWriter->writeAttribute('kx', $majorGridlines->getShadowProperty(array('size', 'kx')));
      }
      if (!is_null($majorGridlines->getShadowProperty('rotWithShape'))) {
        $objWriter->writeAttribute('rotWithShape', $majorGridlines->getShadowProperty('rotWithShape'));
      }
      $objWriter->startElement("a:{$majorGridlines->getShadowProperty(array('color', 'type'))}");
      $objWriter->writeAttribute('val', $majorGridlines->getShadowProperty(array('color', 'value')));

      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $majorGridlines->getShadowProperty(array('color', 'alpha')));
      $objWriter->endElement(); //end alpha

      $objWriter->endElement(); //end color:type
      $objWriter->endElement(); //end shadow
    }

    if (!is_null($majorGridlines->getSoftEdgesSize())) {
      $objWriter->startElement('a:softEdge');
      $objWriter->writeAttribute('rad', $majorGridlines->getSoftEdgesSize());
      $objWriter->endElement(); //end softEdge
    }

    $objWriter->endElement(); //end effectLst
    $objWriter->endElement(); //end spPr
    $objWriter->endElement(); //end majorGridLines

    if ($minorGridlines->getObjectState()) {
      $objWriter->startElement('c:minorGridlines');
      $objWriter->startElement('c:spPr');

      if (!is_null($minorGridlines->getLineColorProperty('value'))) {
        $objWriter->startElement('a:ln');
        $objWriter->writeAttribute('w', $minorGridlines->getLineStyleProperty('width'));
        $objWriter->startElement('a:solidFill');
        $objWriter->startElement("a:{$minorGridlines->getLineColorProperty('type')}");
        $objWriter->writeAttribute('val', $minorGridlines->getLineColorProperty('value'));
        $objWriter->startElement('a:alpha');
        $objWriter->writeAttribute('val', $minorGridlines->getLineColorProperty('alpha'));
        $objWriter->endElement(); //end alpha
        $objWriter->endElement(); //end srgbClr
        $objWriter->endElement(); //end solidFill

        $objWriter->startElement('a:prstDash');
        $objWriter->writeAttribute('val', $minorGridlines->getLineStyleProperty('dash'));
        $objWriter->endElement();

        if ($minorGridlines->getLineStyleProperty('join') == 'miter') {
          $objWriter->startElement('a:miter');
          $objWriter->writeAttribute('lim', '800000');
          $objWriter->endElement();
        } else {
          $objWriter->startElement('a:bevel');
          $objWriter->endElement();
        }

        if (!is_null($minorGridlines->getLineStyleProperty(array('arrow', 'head', 'type')))) {
          $objWriter->startElement('a:headEnd');
          $objWriter->writeAttribute('type', $minorGridlines->getLineStyleProperty(array('arrow', 'head', 'type')));
          $objWriter->writeAttribute('w', $minorGridlines->getLineStyleArrowParameters('head', 'w'));
          $objWriter->writeAttribute('len', $minorGridlines->getLineStyleArrowParameters('head', 'len'));
          $objWriter->endElement();
        }

        if (!is_null($minorGridlines->getLineStyleProperty(array('arrow', 'end', 'type')))) {
          $objWriter->startElement('a:tailEnd');
          $objWriter->writeAttribute('type', $minorGridlines->getLineStyleProperty(array('arrow', 'end', 'type')));
          $objWriter->writeAttribute('w', $minorGridlines->getLineStyleArrowParameters('end', 'w'));
          $objWriter->writeAttribute('len', $minorGridlines->getLineStyleArrowParameters('end', 'len'));
          $objWriter->endElement();
        }
        $objWriter->endElement(); //end ln
      }

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

      if (!is_null($minorGridlines->getGlowSize())) {
        $objWriter->startElement('a:glow');
        $objWriter->writeAttribute('rad', $minorGridlines->getGlowSize());
        $objWriter->startElement("a:{$minorGridlines->getGlowColor('type')}");
        $objWriter->writeAttribute('val', $minorGridlines->getGlowColor('value'));
        $objWriter->startElement('a:alpha');
        $objWriter->writeAttribute('val', $minorGridlines->getGlowColor('alpha'));
        $objWriter->endElement(); //end alpha
        $objWriter->endElement(); //end schemeClr
        $objWriter->endElement(); //end glow
      }

      if (!is_null($minorGridlines->getShadowProperty('presets'))) {
        $objWriter->startElement("a:{$minorGridlines->getShadowProperty('effect')}");
        if (!is_null($minorGridlines->getShadowProperty('blur'))) {
          $objWriter->writeAttribute('blurRad', $minorGridlines->getShadowProperty('blur'));
        }
        if (!is_null($minorGridlines->getShadowProperty('distance'))) {
          $objWriter->writeAttribute('dist', $minorGridlines->getShadowProperty('distance'));
        }
        if (!is_null($minorGridlines->getShadowProperty('direction'))) {
          $objWriter->writeAttribute('dir', $minorGridlines->getShadowProperty('direction'));
        }
        if (!is_null($minorGridlines->getShadowProperty('algn'))) {
          $objWriter->writeAttribute('algn', $minorGridlines->getShadowProperty('algn'));
        }
        if (!is_null($minorGridlines->getShadowProperty(array('size', 'sx')))) {
          $objWriter->writeAttribute('sx', $minorGridlines->getShadowProperty(array('size', 'sx')));
        }
        if (!is_null($minorGridlines->getShadowProperty(array('size', 'sy')))) {
          $objWriter->writeAttribute('sy', $minorGridlines->getShadowProperty(array('size', 'sy')));
        }
        if (!is_null($minorGridlines->getShadowProperty(array('size', 'kx')))) {
          $objWriter->writeAttribute('kx', $minorGridlines->getShadowProperty(array('size', 'kx')));
        }
        if (!is_null($minorGridlines->getShadowProperty('rotWithShape'))) {
          $objWriter->writeAttribute('rotWithShape', $minorGridlines->getShadowProperty('rotWithShape'));
        }
        $objWriter->startElement("a:{$minorGridlines->getShadowProperty(array('color', 'type'))}");
        $objWriter->writeAttribute('val', $minorGridlines->getShadowProperty(array('color', 'value')));
        $objWriter->startElement('a:alpha');
        $objWriter->writeAttribute('val', $minorGridlines->getShadowProperty(array('color', 'alpha')));
        $objWriter->endElement(); //end alpha
        $objWriter->endElement(); //end color:type
        $objWriter->endElement(); //end shadow
      }

      if (!is_null($minorGridlines->getSoftEdgesSize())) {
        $objWriter->startElement('a:softEdge');
        $objWriter->writeAttribute('rad', $minorGridlines->getSoftEdgesSize());
        $objWriter->endElement(); //end softEdge
      }

      $objWriter->endElement(); //end effectLst
      $objWriter->endElement(); //end spPr
      $objWriter->endElement(); //end minorGridLines
    }

    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', $xAxis->getAxisNumberFormat());
    $objWriter->writeAttribute('sourceLinked', $xAxis->getAxisNumberSourceLinked());
    $objWriter->endElement();

    $objWriter->startElement('c:majorTickMark');
    $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('major_tick_mark'));
    $objWriter->endElement();

    $objWriter->startElement('c:minorTickMark');
    $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('minor_tick_mark'));
    $objWriter->endElement();

    $objWriter->startElement('c:tickLblPos');
    $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('axis_labels'));
    $objWriter->endElement();

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

    if (!is_null($xAxis->getFillProperty('value'))) {
      $objWriter->startElement('a:solidFill');
      $objWriter->startElement("a:" . $xAxis->getFillProperty('type'));
      $objWriter->writeAttribute('val', $xAxis->getFillProperty('value'));
      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $xAxis->getFillProperty('alpha'));
      $objWriter->endElement();
      $objWriter->endElement();
      $objWriter->endElement();
    }

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

    $objWriter->writeAttribute('w', $xAxis->getLineStyleProperty('width'));
    $objWriter->writeAttribute('cap', $xAxis->getLineStyleProperty('cap'));
    $objWriter->writeAttribute('cmpd', $xAxis->getLineStyleProperty('compound'));

    if (!is_null($xAxis->getLineProperty('value'))) {
      $objWriter->startElement('a:solidFill');
      $objWriter->startElement("a:" . $xAxis->getLineProperty('type'));
      $objWriter->writeAttribute('val', $xAxis->getLineProperty('value'));
      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $xAxis->getLineProperty('alpha'));
      $objWriter->endElement();
      $objWriter->endElement();
      $objWriter->endElement();
    }

    $objWriter->startElement('a:prstDash');
    $objWriter->writeAttribute('val', $xAxis->getLineStyleProperty('dash'));
    $objWriter->endElement();

    if ($xAxis->getLineStyleProperty('join') == 'miter') {
      $objWriter->startElement('a:miter');
      $objWriter->writeAttribute('lim', '800000');
      $objWriter->endElement();
    } else {
      $objWriter->startElement('a:bevel');
      $objWriter->endElement();
    }

    if (!is_null($xAxis->getLineStyleProperty(array('arrow', 'head', 'type')))) {
      $objWriter->startElement('a:headEnd');
      $objWriter->writeAttribute('type', $xAxis->getLineStyleProperty(array('arrow', 'head', 'type')));
      $objWriter->writeAttribute('w', $xAxis->getLineStyleArrowWidth('head'));
      $objWriter->writeAttribute('len', $xAxis->getLineStyleArrowLength('head'));
      $objWriter->endElement();
    }

    if (!is_null($xAxis->getLineStyleProperty(array('arrow', 'end', 'type')))) {
      $objWriter->startElement('a:tailEnd');
      $objWriter->writeAttribute('type', $xAxis->getLineStyleProperty(array('arrow', 'end', 'type')));
      $objWriter->writeAttribute('w', $xAxis->getLineStyleArrowWidth('end'));
      $objWriter->writeAttribute('len', $xAxis->getLineStyleArrowLength('end'));
      $objWriter->endElement();
    }

    $objWriter->endElement();

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

    if (!is_null($xAxis->getGlowProperty('size'))) {
      $objWriter->startElement('a:glow');
      $objWriter->writeAttribute('rad', $xAxis->getGlowProperty('size'));
      $objWriter->startElement("a:{$xAxis->getGlowProperty(array('color','type'))}");
      $objWriter->writeAttribute('val', $xAxis->getGlowProperty(array('color','value')));
      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $xAxis->getGlowProperty(array('color','alpha')));
      $objWriter->endElement();
      $objWriter->endElement();
      $objWriter->endElement();
    }

    if (!is_null($xAxis->getShadowProperty('presets'))) {
      $objWriter->startElement("a:{$xAxis->getShadowProperty('effect')}");

      if (!is_null($xAxis->getShadowProperty('blur'))) {
        $objWriter->writeAttribute('blurRad', $xAxis->getShadowProperty('blur'));
      }
      if (!is_null($xAxis->getShadowProperty('distance'))) {
        $objWriter->writeAttribute('dist', $xAxis->getShadowProperty('distance'));
      }
      if (!is_null($xAxis->getShadowProperty('direction'))) {
        $objWriter->writeAttribute('dir', $xAxis->getShadowProperty('direction'));
      }
      if (!is_null($xAxis->getShadowProperty('algn'))) {
        $objWriter->writeAttribute('algn', $xAxis->getShadowProperty('algn'));
      }
      if (!is_null($xAxis->getShadowProperty(array('size','sx')))) {
        $objWriter->writeAttribute('sx', $xAxis->getShadowProperty(array('size','sx')));
      }
      if (!is_null($xAxis->getShadowProperty(array('size','sy')))) {
        $objWriter->writeAttribute('sy', $xAxis->getShadowProperty(array('size','sy')));
      }
      if (!is_null($xAxis->getShadowProperty(array('size','kx')))) {
        $objWriter->writeAttribute('kx', $xAxis->getShadowProperty(array('size','kx')));
      }
      if (!is_null($xAxis->getShadowProperty('rotWithShape'))) {
        $objWriter->writeAttribute('rotWithShape', $xAxis->getShadowProperty('rotWithShape'));
      }

      $objWriter->startElement("a:{$xAxis->getShadowProperty(array('color','type'))}");
      $objWriter->writeAttribute('val', $xAxis->getShadowProperty(array('color','value')));
      $objWriter->startElement('a:alpha');
      $objWriter->writeAttribute('val', $xAxis->getShadowProperty(array('color','alpha')));
      $objWriter->endElement();
      $objWriter->endElement();

      $objWriter->endElement();
    }

    if (!is_null($xAxis->getSoftEdgesSize())) {
      $objWriter->startElement('a:softEdge');
      $objWriter->writeAttribute('rad', $xAxis->getSoftEdgesSize());
      $objWriter->endElement();
    }

    $objWriter->endElement(); //effectList
    $objWriter->endElement(); //end spPr

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

      if (!is_null($xAxis->getAxisOptionsProperty('horizontal_crosses_value'))) {
        $objWriter->startElement('c:crossesAt');
        $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('horizontal_crosses_value'));
        $objWriter->endElement();
      } else {
        $objWriter->startElement('c:crosses');
        $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('horizontal_crosses'));
        $objWriter->endElement();
      }

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

      if (!is_null($xAxis->getAxisOptionsProperty('major_unit'))) {
        $objWriter->startElement('c:majorUnit');
        $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('major_unit'));
        $objWriter->endElement();
      }

      if (!is_null($xAxis->getAxisOptionsProperty('minor_unit'))) {
        $objWriter->startElement('c:minorUnit');
        $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('minor_unit'));
        $objWriter->endElement();
      }

    }

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

    $objWriter->endElement();

  }

  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;
  }

  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 (($groupType == PHPExcel_Chart_DataSeries::TYPE_LINECHART) ||
          ($groupType == PHPExcel_Chart_DataSeries::TYPE_STOCKCHART)
      ) {
        $objWriter->startElement('c:spPr');
        $objWriter->startElement('a:ln');
        $objWriter->writeAttribute('w', 12700);
        if ($groupType == PHPExcel_Chart_DataSeries::TYPE_STOCKCHART) {
          $objWriter->startElement('a:noFill');
          $objWriter->endElement();
        }
        $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;
  }

  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();

  }

  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();
    }
  }

  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();
  }

  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();
  }

  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();
  }

  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();
  }

}