新手求助QQCPGraph怎么画封闭的区域！！谢谢 [复制链接]

QCPGraph *graph = ui->widgetYield->addGraph();                   graph->setPen(QPen(Qt::blue, 3));                   graph->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 2));                   graph->setLineStyle(QCPGraph::lsLine);                   graph->addData(latVector, lonVector,true);

QCPGraph *graph = ui->widgetYield->addGraph();                  
graph->setPen(QPen(Qt::blue, 3));                
  graph->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, 2));                
  graph->setLineStyle(QCPGraph::lsLine);              
    graph->addData(latVector, lonVector,true);

6个点，想画封闭的6边形，但是画出来的线不封闭