UbuntuQT中QcustomPlot怎么画两条线？

Question

我有 Ubuntu 14.04，我正在使用 QT C++。我将绘制两条线（在 QcustomPlot 中），每条线的颜色都不同。我会画一条红色线然后画一条绿色线，like this 我的代码：

customPlot->addGraph() ; // color red 
customPlot->addGraph() ; // color green 
customPlot->graph(0)->setPen(QPen(Qt::red));

customPlot->graph(1)->setPen(QPen(Qt::red));
customPlot->graph(1)->setPen(QPen(Qt::green);
customPlot->graphe(0)->adddata(1,1) ;  
customPlot->graphe(0)->adddata(5,1) ;  
customPlot->graphe(1)->adddata(5,1) ; 
customPlot->graphe(1)->adddata(10,1) ;  
customPlot->graphe(0)->adddata(10,1) ; 
customPlot->graphe(0)->adddata(15,1) ;

问题是红线画在绿线上如何解决问题？

Answer 1

 QCPItemLine *item ;
item = new QCPItemLine(ui->courbe);
customPlot->addItem(item);

item->setPen(QPen(Qt::red));
item->start->setCoords(1,1);
item->end->setCoords(5,1);

item = new QCPItemLine(ui->courbe);
item->start->setCoords(6,1);
item->end->setCoords(10,1);
customPlot->replot();

UbuntuQT中QcustomPlot怎么画两条线？

How do you paint two lines on QcustomPlot in QT in Ubuntu?

c++

qt

qcustomplot