PySide6 QLineSeries doesn't plot correctly

[jronald]

Versions

Python             3.13.2
PySide6            6.9.0
PySide6_Addons     6.9.0
PySide6_Essentials 6.9.0
shiboken6          6.9.0

Codes for the chart

def initChart(self):
        self.axis_x = QValueAxis()
        self.axis_x.setTitleText("x")

        self.axis_y = QValueAxis()
        self.axis_y.setTitleText("y")

        self.series = QLineSeries()
        self.series.setName("Line Series")

        self.series.append(0, 6)
        self.series.append(1, 4)
        self.series.append(2, 5)

        self.series.attachAxis(self.axis_x)
        self.series.attachAxis(self.axis_y)

        self.axis_x.setRange(0, 2)
        self.axis_x.setTickCount(3)
        self.axis_y.setRange(0, 6)
        self.axis_y.setTickCount(7)

        self.chart = QChart()
        self.chart.setAnimationOptions(QChart.AllAnimations)
        self.chart.addAxis(self.axis_x, Qt.AlignBottom)
        self.chart.addAxis(self.axis_y, Qt.AlignLeft)
        self.chart.addSeries(self.series)

        self.ui.chartView.setChart(self.chart)
        self.ui.chartView.setRenderHint(QPainter.Antialiasing)

Result

[JonB]

@jronald
Not sure why this is going wrong. Try playing with combinations of: add the series before the axes, remove series' own axes, use createDefaultAxes(). Any difference?

Also FWIW whatever the cause this should not be a PySide6/Python issue, rather the underlying QtCharts code must be the problem.

[jronald]

@JonB said in PySide6 QLineSeries doesn't plot correctly:

this should not be a PySide6/Python issue

Yes, https://bugreports.qt.io/browse/PYSIDE-3083

For it seems not so robust, I tries PythonQwt, but it is not complete, e.g. QwtArraySeriesData is not ported for python.
Now I'm using matplotlib with qtagg backend, it works fine.
It's said that QtGraphs is going to replace QtCharts, but the API in C++ is not complete so far, I'll follow it.

Thanks