QChart 选中图例对应折线变色

因为项目中需要用的折线比较多，查找某一条比较困难所以做了选中图例折线变色的功能，代码比较简单：

QColor              m_color;

QChart                               m_chart;

void MainWindow::markers()//关联初始化

{

    foreach(QLegendMarker* pLegendMarker, m_chart->legend()->markers())

    {

        connect(pLegendMarker, SIGNAL(hovered(bool)), this,SLOT(sltHandleMarkerClicked(bool)));

    }

}

 

void MainWindow::sltHandleMarkerClicked(bool status)

{

    QLegendMarker* poLegendMarker = qobject_cast<QLegendMarker*> (sender());

    switch (poLegendMarker->type())

    {

    case QLegendMarker::LegendMarkerTypeXY:

    {

        QLineSeries* LineSeries = dynamic_cast<QLineSeries*>(poLegendMarker->series());

        poLegendMarker->setVisible(true);

        if(status)

        {

            m_color = LineSeries->color();

            LineSeries->setColor(QColor(255,0,0));

        }

        else{

            LineSeries->setColor(m_color);

            LineSeries->chart()->legend()->setColor(m_color);

        }

        break;

    }

    default:

    {

        qDebug() << "Unknown type";

        break;

    }

    }

}

效果图：前

后：

下载：https://download.youkuaiyun.com/download/u010304326/10930311