QCustomPlot：如何在 y 轴上设置百分比？如何更改刻度标签对齐方式？

Question

我正在研究 Qt 的 QCustomPlot 库。我成功地创建了一些地块。但我还有问题：

1：如何将 y 轴范围设置为 0% 到 100%？

2：我的刻度标签在刻度下方居中。我怎样才能将其更改为左对齐？

感谢您的帮助。

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

你应该用

解决这两个问题

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

编辑：要显示刻度的自定义文本，您应该添加此代码：

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);

QCustomPlot：如何在 y 轴上设置百分比？如何更改刻度标签对齐方式？

QCustomPlot: How to set percent on the y-axis? How to change tick label alignment?

c++

user-interface

charts

qt

qcustomplot