Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

Using Multiple Axes#

Shows how to create a chart with a vertical axis for each series.

Note

This is part of the Charts with Widgets Gallery example.

../_images/examples_multiaxis.png

Create the QChart instance, hide the legend of the chart, and set its title.

chart = QChart()
chart.legend().hide()
chart.setTitle("Multiple Vertical Axes in Chart")

Create a QValueAxis instance that will be used as a horizontal axis by both series and add it the bottom of the chart. The axis can be shared between many series, but each series can have only one vertical and horizontal axis.

axisX = QValueAxis()
axisX.setTickCount(10)
chart.addAxis(axisX, Qt.AlignBottom)

Create the first series, and add the data to it. Finally, add the series to the chart. Instantiate its own Y-axis, add it to the chart. Then attach both the common X-axis and the series specific Y-axis. In this example the color of the axis line is set to be the same as the color of the series to make it possible to distinguish which axis is attached to which series.

series = QSplineSeries()
series << QPointF(1, 5) << QPointF(3.5, 18) << QPointF(4.8, 7.5) << QPointF(10, 2.5)
chart.addSeries(series)
axisY = QValueAxis()
axisY.setLinePenColor(series.pen().color())
chart.addAxis(axisY, Qt.AlignLeft)
series.attachAxis(axisX)
series.attachAxis(axisY)

Similarly prepare another series. This time a different axis type is used. Additionally grid lines color is also set to be the same as the color of the series.

series = QSplineSeries()
series << QPointF(1, 0.5) << QPointF(1.5, 4.5) << QPointF(2.4, 2.5) << QPointF(4.3, 12.5)
        << QPointF(5.2, 3.5) << QPointF(7.4, 16.5) << QPointF(8.3, 7.5) << QPointF(10, 17)
chart.addSeries(series)
axisY3 = QCategoryAxis()
axisY3.append("Low", 5)
axisY3.append("Medium", 12)
axisY3.append("High", 17)
axisY3.setLinePenColor(series.pen().color())
axisY3.setGridLinePen((series.pen()))
chart.addAxis(axisY3, Qt.AlignRight)
series.attachAxis(axisX)
series.attachAxis(axisY3)

Create a QChartView object with QChart as a parameter.

createDefaultChartView(chart)