AreaChart Example#
The example shows how to create a simple area 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 Area Charts#
To create area charts, we need two QLineSeries instances. They are going to define the upper and lower boundary of the area.
series0 = QLineSeries() series1 = QLineSeries()
We add data to both series and use the stream operator.
series0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) << QPointF(12, 6) << QPointF(16, 7) << QPointF(18, 5) series1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) << QPointF(12, 3) << QPointF(16, 4) << QPointF(18, 3)
Now we create a QAreaSeries instance using two line series objects. We set the custom gradient fill and width of the outline.
series = QAreaSeries(series0, series1) series.setName("Batman") pen = QPen(0x059605) pen.setWidth(3) series.setPen(pen) gradient = QLinearGradient(QPointF(0, 0), QPointF(0, 1)) gradient.setColorAt(0.0, 0x3cc63c) gradient.setColorAt(1.0, 0x26f626) gradient.setCoordinateMode(QGradient.ObjectBoundingMode) series.setBrush(gradient)
Last we create the QChartView instance, set the title, set anti-aliasing, and add the area series. We also create the default axes and specify the ranges on them.
chart = QChart() chart.addSeries(series) chart.setTitle("Simple areachart example") chart.createDefaultAxes() chart.axes(Qt.Horizontal).first().setRange(0, 20) chart.axes(Qt.Vertical).first().setRange(0, 10)
The chart is ready to be shown.
chartView = QChartView(chart) chartView.setRenderHint(QPainter.Antialiasing)