LineChart Example▲
Running the Example▲
To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.
Creating Line Charts▲
To create a line chart, a QLineSeries instance is needed. Let's create one.
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QLineSeries *series = new QLineSeries();Then we add data to the series. We can use the append() member function or use the stream operator.
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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.
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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.
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QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);The chart is ready to be shown.
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QMainWindow window;
window.setCentralWidget(chartView);
window.resize(400, 300);
window.show();