@wasawi2 wooops sorry my newby fault!!

I just had to remove the auto in the cpp file.
Therefore:

linewidget.cpp

//![1] m_series = new QLineSeries; //![1]

linewidget.h

QLineSeries* m_series = nullptr;

Everything under control now.
Thanks again for your fast answer @kkoehne.

Hi,

Why not use QChartView::setChart ?

What you currently do is just replacing the object pointed by ui->diceView by a different one, but that is all.

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

Thank you for your advice. I did as you said and it seems it's working well.

Drawing a QGraphicsRectItem to cover the grid line is the solution.

QChart * pChart = new QChart(nullptr); // add axises, series, points QGraphicsRectItem * pItem = new QGraphicsRectItem(0, 0, 0, 0, pChart->graphicsItem()); pItem->setPen(QPen(Qt::red)); pItem->setBrush(QPen(Qt::red)); pItem->setZValue(3); // points on QScatterSeries covers this item and this item covers grid lines pItem->setRect(/* */); // to cover the gird line

To do this what can be done put a QtTimer in onMouseRelease ( when left mouse is released the zoom is done ). Set the timer for the chart.animationDuration() and then when timer is finished have the callback so chart.setSeriesAnimation( NoAnimation)

The animation on qtchart really slows things down even if chart is not updating. It looks good when doing zoom so keep it for that but turn off when zoom finished.

Hi
Well it could work but you will have the issue that a row can only be one height so
if one big and the rest small, it will look odd.

alt text

But if all chart will be ca same size yes it should work ok.

Alternatively, you could tweak this
https://doc.qt.io/qt-5/qtwidgets-layouts-flowlayout-example.html
and put it into a QScrollArea.
Add this to it
https://wiki.qt.io/Widget-moveable-and-resizeable
Tweak it a bit and it should allow for a group of chars in various sizes and
scrollable.

I'm not sure how this happened to the previous two question askers, but for me the solution was quite simple. Qt works just fine at displaying the plot axis data so long as you:

Have enough space to do so Don't mess with the default settings

In my case, I had the axis tick count set pretty high which was causing the labels to squish together. If you leave the tick counts at their default, or let Qt decide, it should work just fine.

Hi @Md0ngo said in QThread signals|calls to QChart are blocking the GUI:

After so much time lost, solved it!!

It seemed to be the fault of the default QSeries implementation... Series.append() apparently emit a couple of signals and resize the inner vector which contain the QPoints. This combined to a O(kn²) loop totally messes up the main event loop.

It was "as easy" as refractoring the code so the thread builds up a QVector of QPoints, then signals each vector to the chart and it calls to series.replace() instead of append(), that is actually faster and lighter.

great that you were able to fix it yourself, and I learned something new and important about QCharts thank you ;-)

I was about to give up after trying the moveToThread way without success, but I was lucky enough to get the solution after finding this.

So, not a matter of Qthreads after all.. Now I'm wondering whether refracting the code to create a dedicated event-loop was worth it or not.

If an actual worker class is now replacing your infinite while loop, that you posted in the op, than yes it is, definitely!

Don't forget to set your topic to solved ;-)

That was to whole error. As for code I have too much to post.

Anyhow I fixed it by creating a new header file, copying the contents from the original header file into the new one, deleting the original and renaming the new header file to the name of the original one.

I found a solution and post it here: link

I know this is an old questin, but at the time of writing, this is still the first hit on my search so hopefully this will help someone else.

Promote it from a QGraphicsView as outlined on Stack Overflow, or compile the plug-in.
https://stackoverflow.com/questions/48362864/how-to-insert-qchartview-in-form-with-qt-designer

Worked, THX!!!

Works, thank you.