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

    protected function writeSlideBackground(AbstractSlideAlias $pSlide, XMLWriter $objWriter)
    {
        if (!$pSlide->getBackground() instanceof Slide\AbstractBackground) {
            return;
        }
        $oBackground = $pSlide->getBackground();
        // p:bg
        $objWriter->startElement('p:bg');
        if ($oBackground instanceof Slide\Background\Color) {
            // p:bgPr
            $objWriter->startElement('p:bgPr');
            // a:solidFill
            $objWriter->startElement('a:solidFill');
            // a:srgbClr
            $objWriter->startElement('a:srgbClr');
            $objWriter->writeAttribute('val', $oBackground->getColor()->getRGB());
            $objWriter->endElement();
            // > a:solidFill
            $objWriter->endElement();
            // p:bgPr/a:effectLst
            $objWriter->writeElement('a:effectLst');
            // > p:bgPr
            $objWriter->endElement();
        }
        if ($oBackground instanceof Slide\Background\Image) {
            // p:bgPr
            $objWriter->startElement('p:bgPr');
            // a:blipFill
            $objWriter->startElement('a:blipFill');
            // a:blip
            $objWriter->startElement('a:blip');
            $objWriter->writeAttribute('r:embed', $oBackground->relationId);
            // > a:blipFill
            $objWriter->endElement();
            // a:stretch
            $objWriter->startElement('a:stretch');
            // a:fillRect
            $objWriter->writeElement('a:fillRect');
            // > a:stretch
            $objWriter->endElement();
            // > a:blipFill
            $objWriter->endElement();
            // > p:bgPr
            $objWriter->endElement();
        }
        /**
         * @link : http://www.officeopenxml.com/prSlide-background.php
         */
        if ($oBackground instanceof Slide\Background\SchemeColor) {
            // p:bgRef
            $objWriter->startElement('p:bgRef');
            $objWriter->writeAttribute('idx', '1001');
            // a:schemeClr
            $objWriter->startElement('a:schemeClr');
            $objWriter->writeAttribute('val', $oBackground->getSchemeColor()->getValue());
            $objWriter->endElement();
            // > p:bgRef
            $objWriter->endElement();
        }
        // > p:bg
        $objWriter->endElement();
    }