@jsulm Thanks , yes I missed this. now It's working ! Thank you

@esvo
[PROBLEM SOLVED]
Turns out its a problem that is independent of windeployqt or qtcharts. Will be logging my findings here in case anyone else comes across this specific-ish issue as well. (Or if anyone has other insights)

The qml files with the charts being loaded in use singletons. I registered these singletons in the c++ main. When I registered the singletons I have the code looking into the working directory for the singleton qml files using the QDir::currentPath() function.

The folder including all the singletons must be included in the same folder as the exe for the app to have access to these files. Dropping the folder with the singleton qml files into the same folder as the exe fixes the problem.

"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.

@CJha try to useOpenGL for series, for qml i use series.useOpenGL = true

@Kent-Dorfman thanx for reply.

Actually I saw few java script programs for pointing accurate pixel values on image by using Mercator projection and it's formula.

I checked it works fine in Java script. But in qt I want to display whole lat long trace so wanted to plot chart with image as it's background. But not able to correctly det the background image as per chart x and y axis values.

@BobbyG Below is the sample code which can be used to update the Chart from C++

void PlotData::updateData(QAbstractSeries *p_series) { QVector<QPointF> pointList; pointList.reserve(numPts); for(int count = 0; count < plot_data_vector.size(); ++count) { pointList.append(x_data, y_data); // fill your plot data here } if(p_series) { QXYSeries *xySeries = static_cast<QXYSeries *>(p_series); xySeries->replace(pointList); } } void PlotData::clearSeries(QAbstractSeries *p_series) { if(p_series) { QXYSeries *xySeries = static_cast<QXYSeries *>(p_series); xySeries->clear(); } }

And from the QML you need to call this function by passing the chart view series.

PlotData.updateData(chartView.series(1))

Hope this helps...

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) )

It might not be the answer but it is a answer. I declare my charts using QML to maintain declarative / visual design.

I only control them from C++ with C++ data. I do all the processing of dynamic axis ranges inside that, I do stupidly high frequency updates.

I'd recommend, if you very frequently update your line series like I do to use: void QXYSeries::replace(QVector<QPointF> points) (or QList...)

and also set your LineSeries to use open GL either from QML or C++ works fine, you do lose some functionality but it saves using canvas (which is slower) if you have lots of points of data, with many fast updates.

HTH

@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)

You can use any of this signals to react to events on a series and do whatever

@JKSH I'm currently thinking about using QCustomPlot which still does not support retina (some performance issues).
@maximo That would be just so overkill, but at least it works :D

Hi,

Do you mean something like setPointsVisible ?

Hi and welcome to devnet,

QtCharts is a licensed feature, you should contact the Qt Company directly from Support Center in your Qt Account page