LineChart Example | Qt Charts 5.15.18

- Qt 5.15
- Qt Charts
- Qt Charts Examples
- LineChart Example
- Qt Charts | Commercial or GPLv3

# LineChart Example

The example shows how to create a simple line chart.

#### 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.

         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();

Example project @ code.qt.io