QString svgPath=tr(":/new/prefix1/svg/circle_red.svg");
QSvgRenderer * rendererRedSvg = new QSvgRenderer(svgPath);
QGraphicsSvgItem *led=new QGraphicsSvgItem();
led->setSharedRenderer(rendererRedSvg );
led->setScale(m_svgScale);
acnScene->addItem(led); //acnScene 场景指针