LineChart Example

To create a line chart, a QLineSeries instance is needed. Let's create one.


      QLineSeries *series = new QLineSeries();

Then we add data to the series. We can use the append() member function or use the stream operator.


      series->append(0, 6);
      series->append(2, 4);
      series->append(3, 8);
      series->append(7, 4);
      series->append(10, 5);
      *series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

To present the data on the chart we need a QChart instance. We add the series to it, create the default axes, and set the title of the chart.


      QChart *chart = new QChart();
      chart->legend()->hide();
      chart->addSeries(series);
      chart->createDefaultAxes();
      chart->setTitle("Simple line chart example");

Then we create a QChartView object with QChart as a parameter. This way we don't need to create a QGraphicsView scene ourselves. We also set the Antialiasing on to have the rendered lines look nicer.


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

The chart is ready to be shown.


      QMainWindow window;
      window.setCentralWidget(chartView);
      window.resize(400, 300);
      window.show();

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