PhpOffice\PhpPresentation\Writer\PowerPoint2007\AbstractSlide::writeDrawingRelations PHP Method

    protected function writeDrawingRelations(AbstractSlideAlias $pSlideMaster, $objWriter, $relId)
    {
        if ($pSlideMaster->getShapeCollection()->count() > 0) {
            // Loop trough images and write relationships
            $iterator = $pSlideMaster->getShapeCollection()->getIterator();
            while ($iterator->valid()) {
                if ($iterator->current() instanceof ShapeDrawingFile || $iterator->current() instanceof ShapeDrawingGd) {
                    // Write relationship for image drawing
                    $this->writeRelationship($objWriter, $relId, 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/image', '../media/' . str_replace(' ', '_', $iterator->current()->getIndexedFilename()));
                    $iterator->current()->relationId = 'rId' . $relId;
                    ++$relId;
                } elseif ($iterator->current() instanceof ShapeChart) {
                    // Write relationship for chart drawing
                    $this->writeRelationship($objWriter, $relId, 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/chart', '../charts/' . $iterator->current()->getIndexedFilename());
                    $iterator->current()->relationId = 'rId' . $relId;
                    ++$relId;
                } elseif ($iterator->current() instanceof Group) {
                    $iterator2 = $iterator->current()->getShapeCollection()->getIterator();
                    while ($iterator2->valid()) {
                        if ($iterator2->current() instanceof ShapeDrawingFile || $iterator2->current() instanceof ShapeDrawingGd) {
                            // Write relationship for image drawing
                            $this->writeRelationship($objWriter, $relId, 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/image', '../media/' . str_replace(' ', '_', $iterator2->current()->getIndexedFilename()));
                            $iterator2->current()->relationId = 'rId' . $relId;
                            ++$relId;
                        } elseif ($iterator2->current() instanceof ShapeChart) {
                            // Write relationship for chart drawing
                            $this->writeRelationship($objWriter, $relId, 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/chart', '../charts/' . $iterator2->current()->getIndexedFilename());
                            $iterator2->current()->relationId = 'rId' . $relId;
                            ++$relId;
                        }
                        $iterator2->next();
                    }
                }
                $iterator->next();
            }
        }
    }