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.
series = 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.
chart = 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.
chartView = QChartView(chart) chartView.setRenderHint(QPainter.Antialiasing)
The chart is ready to be shown.
window = QMainWindow() window.setCentralWidget(chartView) window.resize(400, 300) window.show()
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