PhpOffice\PhpPresentation\Writer\PowerPoint2007\PptCharts::render PHP Method

    public function render()
    {
        for ($i = 0; $i < $this->getDrawingHashTable()->count(); ++$i) {
            $shape = $this->getDrawingHashTable()->getByIndex($i);
            if ($shape instanceof Chart) {
                $this->getZip()->addFromString('ppt/charts/' . $shape->getIndexedFilename(), $this->writeChart($shape));
                if ($shape->hasIncludedSpreadsheet()) {
                    $this->getZip()->addFromString('ppt/charts/_rels/' . $shape->getIndexedFilename() . '.rels', $this->writeChartRelationships($shape));
                    $pFilename = 'PHPExcel';
                    $this->getZip()->addFromString('ppt/embeddings/' . $shape->getIndexedFilename() . '.xlsx', $this->writeSpreadsheet($this->getPresentation(), $shape, $pFilename . '.xlsx'));
                }
            }
        }
        return $this->getZip();
    }