如何使用QCustomplot绘制地震单道波形图

在地震剖面中，我们常需要绘制如下的波形图，如何使用Qt来实现呢？下面是一种尝试，可能帮你解决问题。如果你有更好的方案，欢迎评论，帮助更多人解决问题。 单道波形图

    QCustomPlot *plot = new QCustomPlot();
    customPlot->setMinimumSize(600, 400);
    // Generate datasets to plot
    QVector<double> x(1000), y(1000);
    for (int i = 0; i < 1000; ++i) {
        x[i] = i / 10.0;
        y[i] = sin(x[i]) * exp(-x[i] / 10.0) + 0.1 * (rand() / (double)RAND_MAX - 0.5);
    }

    // create and configure the graph
    QCPGraph *graph = customPlot->addGraph();
    graph->setData(x, y);
    graph->setPen(QPen(Qt::black));
    graph->setBrush(QBrush(Qt::black));

    // find the minimum and maximum y values
    double ymin = INFINITY, ymax = -INFINITY;
    for (int i=0; i<y.size(); ++i)
    {
        if (y[i] < ymin)
            ymin = y[i];
        if (y[i] > ymax)
            ymax = y[i];
    }

    // create and configure the rect item to cover the area below the x axis
    QCPItemRect *rect = new QCPItemRect(customPlot);
    rect->setBrush(QBrush(Qt::white));
    
    // set QCPItemRect only display inside of the axis
    rect->setClipToAxisRect(true);
    rect->setPen(QPen(Qt::NoPen));
    rect->topLeft->setCoords(x.first(), ymin);
    rect->bottomRight->setCoords(x.last(), 0);
    QCPGraph *graph1 = customPlot->addGraph();
    graph1->setData(x, y);
    graph1->setPen(QPen(Qt::black));
    graph1->setBrush(Qt::NoBrush);

    // set blank axis lines:
    customPlot->rescaleAxes();
    customPlot->xAxis->grid()->setVisible(false);
    customPlot->yAxis->grid()->setVisible(false);

    // make top right axes clones of bottom left axes:
    customPlot->axisRect()->setupFullAxesBox();
    // set the range and labels for the axes
    customPlot->xAxis->setRange(x.first(), x.last());
    customPlot->xAxis->setLabel("X Axis");
    customPlot->yAxis->setRange(ymin, ymax);
    customPlot->yAxis->setLabel("Y Axis");

    // show the plot
    customPlot->replot();
    customPlot->show();