"append" causes a redraw. There is no way to disable the redraw that I can find. The QML api for charts is kinda crappy for adding data points. Which is why I had to use "replace" in C++. I have done thousands of points this way and it doesn't cause delays in the UI interface.

@J-Hilk Thank you for answering the question.

Take a look at VXYModelMapper . It lets you create series from a QAbstractTableModel with not all the glue code you did here.

@JonB Thanks for pointing that out, I completely missed it. I'll go with PySide2 until more features are released in Qt6 like you mentioned. Thanks again.

Wating bugfix https://bugreports.qt.io/browse/QTBUG-85053

so for now I use this which seems to work... xAxis->setRange(0,dat.size()); yAxis->setRange(*std::min_element(dat.constBegin(),dat.constEnd()),*std::max_element(dat.constBegin(),dat.constEnd()));

@mrjj thank you :)

@Gojir4 yeah, that's more or less how I used the Component.onCompleted

@lopeztel said in Property of object is not a function: This is what happens when you spend hours staring at the screen ... Sometimes when you have had too much to think you need a break and coffee.

Hi Eventhough this thread is quite old, I faced a similar issue with this truncated axis labels. I found a workaround which is working for me by removing and adding the axes again to the chart. Here is the example code I use (precondition: axes must be added once to chart and series before): auto axes = chart()->axes(); QHash<QAbstractSeries*, QList<QAbstractAxis*>> seriesAxes; for (auto serie : series) { auto attachedAxes = serie->attachedAxes(); for (auto axis : attachedAxes) { if (axes.contains(axis)) { auto &serieAxes = seriesAxes[serie]; serieAxes.append(axis); } } } for (auto axis : axes) { chart()->removeAxis(axis); auto alignment = axis->alignment(); chart()->addAxis(axis, alignment); } QHashIterator<QAbstractSeries*, QList<QAbstractAxis*>> iSeriesAxes(seriesAxes); while (iSeriesAxes.hasNext()) { auto serie = iSeriesAxes.next().key(); auto axes = iSeriesAxes.value(); for (auto axis : axes) { serie->attachAxis(axis); } } Cheers, Reto

@SGaist thanks I‘ll bookmark that as well I was just googleing qtcharts source and took the firts link 🙈

@SGaist Hi Sam, Thank you for your hint, but my first problem was preventing the edit trigger on single click. For the posterity I have ended up with the following solution: Disable the textInteraction flags by default Override the QGraphicsTextItem::sceneEvent with the following: bool ValueAxisLabel::sceneEvent(QEvent *event) { if (event->type() == QEvent::GraphicsSceneMouseDoubleClick) { setTextInteractionFlags(Qt::TextEditorInteraction); bool ret = QGraphicsTextItem::sceneEvent(event); // QGraphicsTextItem::sceneevent needs to be processed before // the focus setFocus(Qt::MouseFocusReason); return ret; } return QGraphicsTextItem::sceneEvent(event); } The textInteractionFlags should be disabled in the overridden focusOutEvent.

I'd recommend using https://doc.qt.io/qt-5.10/qxyseries.html#replace-5 Replacing points one by one destroys a cpu. The metrics for me was just not even worth measuring - it was just an immediate hell no - forget that - I need faster updates. I like declarative QML for gui as a preference but calling replace on a single point fires way too many signals and takes way too long. I throw my QML LineSeries to a QXYSeries and call replace in c++ In the future I'll probably just declare my series in C++. I wish I could have a better supported hybrid of c++ and QML charts but I have this working very fast using useOpenGL : true; (you can also c++ setUseOpenGL(true) )

In case anyone else falls into this error, i found the solution was that my Debug build in Visual studio was linked against QChart.lib, not QChartd.lib. Once i changed this it worked.

Worth linking this topic to the answer documented on StackOverflow: https://stackoverflow.com/questions/46886443/scrollable-qml-charts

@rahulch_pp Try to comment the line 18 of main.qml " animationOptions: ChartView.AllAnimations". It seems to be buggy from Qt5.12 (and also Qt5.12.1)

do you want to plot the axis and legend? or just the pixels? and you want to plot the matrix from image or from data?

Works, thank you.

@awawawa Hi. Try in your test.h as follows: #ifndef TEST_H #define TEST_H #include <QtCharts> QT_CHARTS_USE_NAMESPACE #include <QMainWindow> #include "ui_test.h" class test : public QMainWindow { [...] Do not modify your ui_test.h.

Thanks a lot! solve my problem, it is really easy to foget that!

I've found out that it has already been implemented. https://bugreports.qt.io/browse/QTBUG-50544

OK so this example is about QLineSeries, not QBarSeries, and there is a reason: QLineSeries has clicked(QPointF) and hovered(QPointF, bool) signals, QBarSeries doesn't. So I think I'll have to simply implement a BarView that displays the value, using QGraphics framework.

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@Wieland No problem :)

Hi and welcome to devnet, How did you compile that module for your BBB ?

@RTjen which begs to differ, is this a known bug with the Spline function I don't know, as I said I don't use the module, but you could look here (you can login with your forum credentials). One thing that caught my eye though is this bug, which doesn't speak well of the implementation of the charts module, as the developer provided some lazy excuse (this is simply implemented by notifying the owner of the destruction). Anyway, you could either file a bug report or try something else. My father (who uses a commercial license) gave up on the charts and is currently using QCustomPlot, so you could try that if it provides what you're after. I hope that helps. Kind regards.

@vladstelmahovsky Thanks! That worked like a charm. It also gave me a good starting for digging into the interaction code and figuring out how the mouse handlers work between QML and C++.

Hello, Thanks you for the answer. Mid'.