/**
* Write charts to XML format
*
* @param \PHPExcel\Chart $pChart
*
* @return string XML Output
* @throws \PHPExcel\Writer\Exception
*/
public function writeChart(\PHPExcel\Chart $pChart = null, $calculateCellValues = true)
{
$this->calculateCellValues = $calculateCellValues;
// Create XML writer
$objWriter = null;
if ($this->getParentWriter()->getUseDiskCaching()) {
$objWriter = new \PHPExcel\Shared\XMLWriter(\PHPExcel\Shared\XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
} else {
$objWriter = new \PHPExcel\Shared\XMLWriter(\PHPExcel\Shared\XMLWriter::STORAGE_MEMORY);
}
// Ensure that data series values are up-to-date before we save
if ($this->calculateCellValues) {
$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();
}
