写一份QT实时绘制折线图的代码

好的，以下是一份基于QT实时绘制折线图的代码示例：

#include <QApplication>
#include <QMainWindow>
#include <QWidget>
#include <QtCharts/QChartView>
#include <QtCharts/QLineSeries>
#include <QPointF>
#include <QTimer>
#include <QDebug>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QMainWindow window;

    QLineSeries *series = new QLineSeries();
    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->createDefaultAxes();
    chart->setTitle("Real-time Line Chart");

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    window.setCentralWidget(chartView);
    window.resize(800, 600);
    window.show();

    // Create a timer for updating the chart
    QTimer timer;
    QObject::connect(&timer, &QTimer::timeout, [&](){
        qreal x = QDateTime::currentDateTime().toMSecsSinceEpoch()/1000.0;
        qreal y = qrand() % 10;
        qDebug() << "Adding data point: (" << x << ", " << y << ")";
        series->append(x, y);
        // Keep maximum of 10 data points in series
        if (series->count() > 10) {
            series->removePoints(0, series->count() - 10);
            chart->axisX()->setRange(x - 10, x);
        }
    });

    // Start the timer
    timer.start(1000);

    return a.exec();
}

这份代码通过使用QT的QtCharts模块实现了实时绘制折线图的功能。具体来说，它使用了QLineSeries来存储数据，使用QChart来绘制图表，并且使用QTimer每隔1秒钟更新一次图表。在每次更新时，代码会生成一个随机的y数值，并将当前时间戳作为x坐标，通过调用QLineSeries的append方法将数据添加到线性图中，实现实时绘制效果。