点燃双创梦想中关村软件园?亿蜂企业服务集市在京成功

QT    += charts

QT_CHARTS_USE_NAMESPACE

#include <QChartView>
#include <QChart>

chart = new QChart();

    mAxY = new QValueAxis();
    mAxX = new QValueAxis();
    mLineSeries = new QLineSeries();

    //y轴范围
    mAxY->setRange(0, 10);
    // Y轴分等份
    mAxY->setTickCount(11);
    mAxX->setRange(0,10);
    mAxX->setTickCount(11);

    // 将系列添加到图表
    chart->addSeries(mLineSeries);
    chart->setTheme(QtCharts::QChart::ChartThemeBrownSand);

    mAxX->setTitleText(QString(tr("ImageNumber")));
    mAxY->setTitleText(QString(tr("ReadRate(%)")));
    chart->addAxis(mAxY, Qt::AlignLeft);
    chart->addAxis(mAxX, Qt::AlignBottom);

    mLineSeries->attachAxis(mAxY);
    mLineSeries->attachAxis(mAxX);

    //隐藏背景
    chart->setBackgroundVisible(false);
    //设置外边界全部为0
    chart->setContentsMargins(0, 0, 0, 0);
    //设置内边界全部为0
    chart->setMargins(QMargins(0, 0, 0, 0));
    //设置背景区域无圆角
    chart->setBackgroundRoundness(0);

    //突出曲线上的点
    mLineSeries->setPointsVisible(true);

    //图例
    QLegend *mlegend = chart->legend();
    mLineSeries->setName("testname");
    mLineSeries->setColor(QColor(255,0,0));
    //在底部显示
    mlegend->setAlignment(Qt::AlignBottom);
    mlegend->show();

    // 将图表绑定到视图 wiget 为 QChartView
    ui->widget->setChart(chart);

    for(int i = 0 ;i < 10;i++){
        mLineSeries->append(i+1, i);
    }

QList<QPointF> oldPoints = mLineSeries->points();
    int pointCount =oldPoints.size();

    if(pointCount > mAxX->max()){

        QList<QPointF> newPoints;

        for(int i = 0; i < pointCount; i++){

            QPointF point;
            point.setX(oldPoints.at(i).x()-1);
            point.setY(oldPoints.at(i).y());

            newPoints.append(point);
        }
        qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
        QPointF point;
        point.setX(oldPoints.at(pointCount -1).x());
        point.setY(qrand()%10);
        newPoints.append(point);
        mLineSeries->clear();
        mLineSeries->append(newPoints);
        mLineSeries->setPointsVisible(true);
    }
    else{
        qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
        QPointF point;
        point.setX(oldPoints.at(pointCount -1).x() +1);
        point.setY(qrand()%10);
        mLineSeries->append(point);
    }

// 最大采样数
const int MaxSize = 100;
// 定时时间间隔-ms
const int TimerBreaks = 10;

void MainWindow::slot_timeout()
{
    static int cnt = 0;
    static QDateTime BeginTime, EndTime;

    if (cnt == 0)
    {
        BeginTime = QDateTime::currentDateTime();
        EndTime = BeginTime.addMSecs(MaxSize*(TimerBreaks + 1));
        mAxDateX->setMin(BeginTime);
        mAxDateX->setMax(EndTime);
    }

    qint64 x1 = QDateTime::currentMSecsSinceEpoch();

    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
    qreal y =qrand()%10;

    cnt = cnt > (MaxSize - 1) ? 1 : (++cnt);

    if (mLineSeries->count() > (MaxSize-1))
    {
        //删除第一个元素
        mLineSeries->removePoints(0, 1);
        EndTime = QDateTime::currentDateTime();
        BeginTime = EndTime.addMSecs((qint64)MaxSize*(-1)*TimerBreaks);

        mAxDateX->setMin(BeginTime);
        mAxDateX->setMax(EndTime);
    }
    
    mLineSeries->append(x1, y);

}

const auto markers = m_chart->legend()->markers();
for (QLegendMarker *marker : markers) {
// Disconnect possible existing connection to avoid multiple connections
 QObject::disconnect(marker, &QLegendMarker::clicked, this ,&MainWidget::handleMarkerClicked);
QObject::connect(marker, &QLegendMarker::clicked, this, &MainWidget::handleMarkerClicked);

//点击事件
void MainWidget::handleMarkerClicked()
{
    QLegendMarker* marker = qobject_cast<QLegendMarker*> (sender());
    //断言
    Q_ASSERT(marker);
    switch (marker->type())
    {
        case QLegendMarker::LegendMarkerTypeXY:
        {
        //控序列隐藏/显示
        // Toggle visibility of series
        marker->series()->setVisible(!marker->series()->isVisible());

        // Turn legend marker back to visible, since hiding series also hides the marker
        // and we don't want it to happen now.
        marker->setVisible(true);
        
        //修改图例
        // Dim the marker, if series is not visible
        qreal alpha = 1.0;

        if (!marker->series()->isVisible())
            alpha = 0.5;

        QColor color;
        QBrush brush = marker->labelBrush();
        color = brush.color();
        color.setAlphaF(alpha);
        brush.setColor(color);
        marker->setLabelBrush(brush);

        brush = marker->brush();
        color = brush.color();
        color.setAlphaF(alpha);
        brush.setColor(color);
        marker->setBrush(brush);

        QPen pen = marker->pen();
        color = pen.color();
        color.setAlphaF(alpha);
        pen.setColor(color);
        marker->setPen(pen);
        break;
        }
    default:
        {
        qDebug() << "Unknown marker type";
        break;
        }
    }
}

m_chart->setAnimationOptions(QChart::NoAnimation);

line->setUseOpenGL();

line->append(newPoints);