Qt 5.9 | Qt Charts | Logarithmic Axis Example | main.cpp Example File

Qt 5.9.9 Reference Documentation

# main.cpp Example File

logvalueaxis/main.cpp

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      ** Contact: https://www.qt.io/licensing/
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      ** This file is part of the Qt Charts module of the Qt Toolkit.
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      #include <QtCharts/QChartView>
      #include <QtCharts/QLineSeries>
      #include <QtCharts/QLogValueAxis>
      #include <QtCharts/QValueAxis>
      #include <QtWidgets/QApplication>
      #include <QtWidgets/QMainWindow>

      QT_CHARTS_USE_NAMESPACE

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

          QLineSeries *series = new QLineSeries();
          *series << QPointF(1.0, 1.0) << QPointF(2.0, 73.0) << QPointF(3.0, 268.0) << QPointF(4.0, 17.0)
                  << QPointF(5.0, 4325.0) << QPointF(6.0, 723.0);

          QChart *chart = new QChart();
          chart->addSeries(series);
          chart->legend()->hide();
          chart->setTitle("Logarithmic axis example");

          QValueAxis *axisX = new QValueAxis();
          axisX->setTitleText("Data point");
          axisX->setLabelFormat("%i");
          axisX->setTickCount(series->count());
          chart->addAxis(axisX, Qt::AlignBottom);
          series->attachAxis(axisX);

          QLogValueAxis *axisY = new QLogValueAxis();
          axisY->setTitleText("Values");
          axisY->setLabelFormat("%g");
          axisY->setBase(8.0);
          axisY->setMinorTickCount(-1);
          chart->addAxis(axisY, Qt::AlignLeft);
          series->attachAxis(axisY);

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

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

          return app.exec();
      }