Warning

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

Customizing Charts

Shows how to customize the appearance of chart elements.

Note

This is part of the Charts with Widgets Gallery example.

We begin by creating a simple line series and a chart object.

series = QLineSeries()
series << QPointF(0, 6) << QPointF(9, 4) << QPointF(15, 20) << QPointF(25, 12) << QPointF(29, 26)
chart = QChart()
chart.legend().hide()
chart.addSeries(series)

First we customize the series and the chart’s title and background.

# Customize series
pen = QPen(QRgb(0xfdb157))
pen.setWidth(5)
series.setPen(pen)
# Customize chart title
font = QFont()
font.setPixelSize(18)
chart.setTitleFont(font)
chart.setTitleBrush(QBrush(Qt.white))
chart.setTitle("Custom Chart")
# Customize chart background
backgroundGradient = QLinearGradient()
backgroundGradient.setStart(QPointF(0, 0))
backgroundGradient.setFinalStop(QPointF(0, 1))
backgroundGradient.setColorAt(0.0, QRgb(0xd2d0d1))
backgroundGradient.setColorAt(1.0, QRgb(0x4c4547))
backgroundGradient.setCoordinateMode(QGradient.ObjectBoundingMode)
chart.setBackgroundBrush(backgroundGradient)
# Customize plot area background
plotAreaGradient = QLinearGradient()
plotAreaGradient.setStart(QPointF(0, 1))
plotAreaGradient.setFinalStop(QPointF(1, 0))
plotAreaGradient.setColorAt(0.0, QRgb(0x555555))
plotAreaGradient.setColorAt(1.0, QRgb(0x55aa55))
plotAreaGradient.setCoordinateMode(QGradient.ObjectBoundingMode)
chart.setPlotAreaBackgroundBrush(plotAreaGradient)
chart.setPlotAreaBackgroundVisible(True)

Then we customize the axes.

axisX = QCategoryAxis()
axisY = QCategoryAxis()
# Customize axis label font
labelsFont = QFont()
labelsFont.setPixelSize(12)
axisX.setLabelsFont(labelsFont)
axisY.setLabelsFont(labelsFont)
# Customize axis colors
axisPen = QPen(QRgb(0xd18952))
axisPen.setWidth(2)
axisX.setLinePen(axisPen)
axisY.setLinePen(axisPen)
# Customize axis label colors
axisBrush = QBrush(Qt.white)
axisX.setLabelsBrush(axisBrush)
axisY.setLabelsBrush(axisBrush)
# Customize grid lines and shades
axisX.setGridLineVisible(False)
axisY.setGridLineVisible(False)
axisY.setShadesPen(Qt.NoPen)
axisY.setShadesBrush(QBrush(QColor(0x99, 0xcc, 0xcc, 0x55)))
axisY.setShadesVisible(True)

Then the axis label values and ranges. Once the axes are ready, we set them to be used by the chart.

axisX.append("low", 10)
axisX.append("optimal", 20)
axisX.append("high", 30)
axisX.setRange(0, 30)
axisY.append("slow", 10)
axisY.append("med", 20)
axisY.append("fast", 30)
axisY.setRange(0, 30)
chart.addAxis(axisX, Qt.AlignBottom)
chart.addAxis(axisY, Qt.AlignLeft)
series.attachAxis(axisX)
series.attachAxis(axisY)

Finally, we create a view containing the chart.

createDefaultChartView(chart)

Now we are ready to show the chart on a main window.