QCustomPlot：如何在y軸上設置百分比？ 如何更改刻度標簽對齊方式？

Question

我正在玩Qt的QCustomPlot庫。 我成功創建了一些圖。 但是我仍然有疑問：

1：如何將y軸范圍設置為0％到100％？

2：我的刻度標簽在刻度下方居中。 如何將其更改為左對齊？

謝謝你的幫助。

彼得

// generate some data:
    QVector<double> x(101), y(101); // initialize with entries 0..100
    for (int i=0; i<101; ++i)
    {
      x[i] = (i*960); // x goes from -1 to 1
      y[i] = x[i]/96000.0; // let's plot a quadratic function
    }
    // create graph and assign data to it:
    ui->customPlot->addGraph();
    ui->customPlot->graph(0)->setData(x, y);

    // set axes ranges, so we see all data:
    ui->customPlot->xAxis->setTickLabelType(QCPAxis::ltDateTime);
    ui->customPlot->xAxis->setDateTimeSpec(Qt::UTC);
    ui->customPlot->xAxis->setDateTimeFormat("hh:mm");
    ui->customPlot->xAxis->setAutoTickStep(false);
    ui->customPlot->xAxis->setTickStep(3600);
    ui->customPlot->xAxis->setRange(0, 86399);
    ui->customPlot->yAxis->setRange(0, 1);
    ui->customPlot->replot();

ui->customPlot->xAxis->setBasePen(QPen(Qt::white, 1));
ui->customPlot->yAxis->setBasePen(QPen(Qt::white, 1));
ui->customPlot->xAxis->setTickPen(QPen(Qt::white, 1));
ui->customPlot->yAxis->setTickPen(QPen(Qt::white, 1));
ui->customPlot->xAxis->setSubTickPen(QPen(Qt::white, 1));
ui->customPlot->yAxis->setSubTickPen(QPen(Qt::white, 1));
ui->customPlot->xAxis->setTickLabelColor(Qt::white);
ui->customPlot->yAxis->setTickLabelColor(Qt::white);
ui->customPlot->xAxis->grid()->setPen(QPen(QColor(140, 140, 140), 1, Qt::DotLine));
ui->customPlot->yAxis->grid()->setPen(QPen(QColor(140, 140, 140), 1, Qt::DotLine));
ui->customPlot->xAxis->grid()->setSubGridPen(QPen(QColor(80, 80, 80), 1, Qt::DotLine));
ui->customPlot->yAxis->grid()->setSubGridPen(QPen(QColor(80, 80, 80), 1, Qt::DotLine));
ui->customPlot->xAxis->grid()->setSubGridVisible(true);
ui->customPlot->yAxis->grid()->setSubGridVisible(true);
ui->customPlot->xAxis->grid()->setZeroLinePen(Qt::NoPen);
ui->customPlot->yAxis->grid()->setZeroLinePen(Qt::NoPen);
ui->customPlot->xAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);
ui->customPlot->yAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);

Answer 1

您應該同時解決兩個問題

ui->customPlot->yAxis->setRange(0, 100, Qt::AlignLeft);

編輯：要顯示刻度的自定義文本，您應該添加以下代碼：

QVector<double> TickValues;
QVector<QString> TickLabels;
// you can safely change the values according to the output
TickValues << 0  << 20 << 40 << 60 << 80 << 100;
TickLabels << "0" << "20%" << "40%" << "60%" << "80%" << "100%";
// disable default ticks and their labels
ui->customPlot->yAxis->setAutoTicks(false);
ui->customPlot->yAxis->setAutoTickLabels(false);
// add your custom values and labels
ui->customPlot->yAxis->setTickVector(TicksValues);
ui->customPlot->yAxis->setTickVectorLabels(TickLabels);