<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2011 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 - 2011 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 - 2011 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 	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);
		}

		// 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);

				$this->_writeLegend($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:p');

						$caption = $title->getCaption();
						if (is_array($caption))
							$caption = $caption[0];
						$this->getParentWriter()->getWriterPart('stringtable')->writeRichText($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,
									$objWriter)
	{
		if (is_null($plotArea)) {
			return;
		}

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

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

			$chartTypes = self::_getChartType($plotArea);
			$catIsMultiLevelSeries = $valIsMultiLevelSeries = FALSE;
			foreach($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) {
							$this->_writePlotGroup($plotGroup, $groupType, $objWriter, $catIsMultiLevelSeries, $valIsMultiLevelSeries);
						}
					}

					$this->_writeDataLbls($objWriter);

					if (($groupType === PHPExcel_Chart_DataSeries::TYPE_LINECHART) ||
						($groupType === PHPExcel_Chart_DataSeries::TYPE_LINECHART_3D) ||
						($groupType === PHPExcel_Chart_DataSeries::TYPE_AREACHART) ||
						($groupType === PHPExcel_Chart_DataSeries::TYPE_AREACHART_3D)) {
						$objWriter->startElement('c:smooth');
							$objWriter->writeAttribute('val', (integer) $plotGroup->getSmoothLine() );
						$objWriter->endElement();
					} elseif (($groupType === PHPExcel_Chart_DataSeries::TYPE_BARCHART) ||
						($groupType === PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D)) {
						$objWriter->startElement('c:gapWidth');
							$objWriter->writeAttribute('val', 150 );
						$objWriter->endElement();
					}

					if (($groupType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART) &&
						($groupType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) &&
						($groupType !== PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)) {
						//	Generate 2 unique numbers to use for axId values
						$id1 = $id2 = rand(10000000,99999999);
						do {
							$id2 = rand(10000000,99999999);
						} while ($id1 == $id2);

						$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();
					}

				$objWriter->endElement();
			}

			$this->_writeCatAx($objWriter,$plotArea,$xAxisLabel,$id1,$id2,$catIsMultiLevelSeries);

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

		$objWriter->endElement();
	}

	private function _writeDataLbls($objWriter)
	{
		$objWriter->startElement('c:dLbls');

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

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

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

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

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

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

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

		$objWriter->endElement();
	}

	private function _writeCatAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $xAxisLabel, $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();

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

								$caption = $xAxisLabel->getCaption();
								if (is_array($caption))
									$caption = $caption[0];
								$this->getParentWriter()->getWriterPart('stringtable')->writeRichText($objWriter, $caption, 'a');

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

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

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

			}

			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();

	}


	private function _writeValAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $yAxisLabel, $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();

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

								$caption = $yAxisLabel->getCaption();
								if (is_array($caption))
									$caption = $caption[0];
								$this->getParentWriter()->getWriterPart('stringtable')->writeRichText($objWriter, $caption, 'a');

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

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

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

				$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) {
				$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 Exception('Chart is not yet implemented');
			}
		}

		return $chartType;
	}

	private function _writePlotGroup($plotGroup, $groupType, $objWriter, &$catIsMultiLevelSeries, &$valIsMultiLevelSeries)
	{
		if (is_null($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())) {
			$objWriter->startElement('c:grouping');
				$objWriter->writeAttribute('val', $plotGroup->getPlotGrouping());
			$objWriter->endElement();
		}

		//	TODO	Set to 1 if any plotseries values don't have style colours defined, otherwise set to 0
		$objWriter->startElement('c:varyColors');
			$objWriter->writeAttribute('val', 1);
		$objWriter->endElement();

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

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

				$objWriter->startElement('c:order');
					$objWriter->writeAttribute('val', $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();
				}

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

					$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();
					$objWriter->startElement('c:cat');
						$this->_writePlotSeriesValues($plotSeriesCategory, $objWriter, 'str');
					$objWriter->endElement();
				}

				//	Values
				$plotSeriesValues = $plotGroup->getPlotValuesByIndex($plotSeriesRef);
				if ($plotSeriesValues) {
					$valIsMultiLevelSeries = $valIsMultiLevelSeries || $plotSeriesValues->isMultiLevelSeries();
					$objWriter->startElement('c:val');
						$this->_writePlotSeriesValues($plotSeriesValues, $objWriter, 'num');
					$objWriter->endElement();
				}

			$objWriter->endElement();

		}
	}

	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, $dataType='str')
	{
		if (is_null($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');

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

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

					foreach($plotSeriesValues->getDataValues() 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 _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();
	}

}