QCustomPlot - 各种标签中的图

我目前通过串行通信接收信息，请参阅下面的数据示例：

"A Ch1:45.23 Ch2:23.58 Ch3:12.45 Ch4:1.56"
"B Ch1:12.63 Ch2:15.45 Ch3:6.23 Ch4:45.32"
"C Ch1:22.20 Ch2:3.85 Ch3:2.45 Ch4:51.58"
"D Ch1:21.25 Ch2:2.58 Ch3:12.13 Ch4:61.52"
"A Ch1:4.27 Ch2:25.52 Ch3:22.15 Ch4:31.56" etc.

现在我要做的是获取所有传入的数据并绘制它 . 为此，我创建了一个带有多个选项卡的Qt应用程序 .

Tab 1 - All Sections
Tab 2 - Section A
Tab 3 - Section B
Tab 4 - Section C
Tab 5 - Section D

我在每个选项卡中添加了一个小部件，并将其提升为QCustomPlot .

我按如下方式设置每个QCustomPlot：

// Would be nice to improve this
setupGraph(ui->sectionA);   // Setup Section A QCustomPlot
setupGraph(ui->sectionB);   // Setup Section B QCustomPlot
setupGraph(ui->sectionC);   // Setup Section C QCustomPlot
setupGraph(ui->sectionD);   // Setup Section D QCustomPlot

void MainWindow::setupGraph(QCustomPlot *graphPlot)
{
    QStringList legend;

    legend << "Load Cell 1" << "Load Cell 2" << "Load Cell 3" << "Load Cell 4" << "Total Weight";

    graphPlot->legend->setVisible(true);
    graphPlot->legend->setFont(QFont("Helvetica",9));

    for (int i = 0; i < legend.size(); i++)
    {
        graphPlot->addGraph();
        graphPlot->graph(i)->setName(legend[i]);
        graphPlot->graph(i)->setLineStyle(QCPGraph::lsLine);
    }

    graphPlot->graph(0)->setPen(QPen(Qt::blue));
    graphPlot->graph(1)->setPen(QPen(Qt::red));
    graphPlot->graph(2)->setPen(QPen(Qt::green));
    graphPlot->graph(3)->setPen(QPen(Qt::darkCyan));
    graphPlot->axisRect()->setupFullAxesBox();
    graphPlot->xAxis->setRange(-10,0);
    graphPlot->yAxis->setRange(0,5);
    connect(graphPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), graphPlot->xAxis2, SLOT(setRange(QCPRange)));
    connect(graphPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), graphPlot->yAxis2, SLOT(setRange(QCPRange)));
}

完成后，我打开串口并连接到ReadyRead信号 . 每次有新数据时，我都会检查新数据的来源，我想绘制它 .

void MainWindow::readData()
{
    QByteArray serialData;

    if (serial->canReadLine())
        serialData = serial->readLine();

    if (serialData.startsWith('A'))
        realtimePlot(ui->sectionA) // Plot the data for Section A
    if (serialData.startsWith('B'))
        realtimePlot(ui->sectionB) // Plot the data for Section B
    if (serialData.startsWith('C'))
        realtimePlot(ui->sectionC) // Plot the data for Section C
    if (serialData.startsWith('D'))
        realtimePlot(ui->sectionD) // Plot the data for Section D
}

我省略了从传入数据中提取实际值的代码 .

void MainWindow::realtimePlot(QCustomPlot *graphPlot)
{
    range_y_min = 0;
    range_y_max = 100;
    // Add data to the lines
    graphPlot->graph(0)->addData(key_x, ch1);
    graphPlot->graph(1)->addData(key_x, ch2);
    graphPlot->graph(2)->addData(key_x, ch3);
    graphPlot->graph(3)->addData(key_x, ch4);
    // Remove data outside the visible range
    graphPlot->graph(0)->removeDataBefore(key_x-10);
    graphPlot->graph(1)->removeDataBefore(key_x-10);
    graphPlot->graph(2)->removeDataBefore(key_x-10);
    graphPlot->graph(3)->removeDataBefore(key_x-10);
    // Make the x-axis range scroll with the data (at a constant range size of 10):
    graphPlot->xAxis->setRange(key_x+1/frequency,10,Qt::AlignRight);
    // Set the range of the y-axis
    graphPlot->yAxis->setRange(range_y_min,range_y_max+5);
    // Replot the graph
    graphPlot->replot();
    key_x += 1/frequency; // defines horizontal gap between two data points on graph
}

现在我希望removeDataBefore（key_x-10）在该点之前删除所有数据，因为我发现我的内存很快就会填满 . key_x和频率在其他地方定义 .

我目前拥有的代码（类似于上面的代码）确实有效，但过了一段时间，一切都开始变慢，一切都被延迟了 . 所以我不太确定是什么问题或导致这种情况发生 . 我还想知道如何使用选项卡1上的A部分，B部分，C部分和D部分的图表，因为我不想在第一个选项卡上创建另外4个小部件来绘制数据 .

我希望我已经给你足够的背景资料 .

提前谢谢你的帮助 .