protected function writeGradientFill(XMLWriter $objWriter, Fill $pFill)
{
// a:gradFill
$objWriter->startElement('a:gradFill');
// a:gsLst
$objWriter->startElement('a:gsLst');
// a:gs
$objWriter->startElement('a:gs');
$objWriter->writeAttribute('pos', '0');
$this->writeColor($objWriter, $pFill->getStartColor());
$objWriter->endElement();
// a:gs
$objWriter->startElement('a:gs');
$objWriter->writeAttribute('pos', '100000');
$this->writeColor($objWriter, $pFill->getEndColor());
$objWriter->endElement();
$objWriter->endElement();
// a:lin
$objWriter->startElement('a:lin');
$objWriter->writeAttribute('ang', CommonDrawing::degreesToAngle($pFill->getRotation()));
$objWriter->writeAttribute('scaled', '0');
$objWriter->endElement();
$objWriter->endElement();
}