ChartView | An example of custom chart on Android | Canvas library

I'm stuck on a problem where i need to set y-axis based on its plot. Right now program stretches the plot to fit whole chart however i need it to let some free space above the plot. I wasn't able to come up with anything so far. Code looks like this:

I am streaming TimeSeries that I want to chart efficiently (20+ chart live on a small computer). I have tried PyQtChart and pyqtgraph on PyQt5, but with both libs, I am ending up redrawing the whole chart for each data that I receive, which doesn't feel optimal. I settled for PyQtChart because it was handling better DatetimeSeries, but happy to be proven wrong (and share the pyqtgraph code, just didn't want to make the post too big).

Bellow is my working code with PyQtChart using random datas, so that you can run it:

I have a chart with dynamically data.

So I want when the indexes from the list is more than 20 to be activated horizontal Scrollview and my chart to be stretched horizontally ?

My .xaml file look like this:

I have a base component named MyChart.qml like this

The below code is related to qchart example "Custom chart" in qt examples. I tried several different solutions but failed to understand or get a proper idea as a solution. I want to get my chart to update values on run time. so the chart values don't remain static but instead, they are dynamic. I want it to be signal & slot-based. (technically signal will be coming from another file including data but here for testing purposes I tried to use that push button as signal and slot but failed to understand how to do it). I tried it but nothing happens. I just don't know where I am missing it. Below is the code.

main.cpp

The Qt Custom Chart from example looks like this:

But when I add it in another project where I added a frame named chartframe from Qt Designer and added this custom chart to it, it goes to a very small size.

Below is the code for mainwindow.cpp:

I am returning a partial view from the controller and is working fine in local, but after publishing the code on server, it is not loading the partial view. It shows below error:

/Monitoring/GetData:1 Failed to load resource: the server responded with a status of

Failed to load resource: the server responded with a status of 404 (Not Found)

My Controller action is here that returns the partial view GetData:

The QObject::connect returns true and when I manually emit the signal, the breakpoint is hit in the slot, but when I hover over a QCandlestickSet, the signal is not emitted.

I removed all other custom drawings from the chart to be sure nothing was overlaying the candlesticks, but the signal still does not fire.

'chartView' is of type 'ChartView' which is derived from 'QChartView'.

'series' is of type 'QCandlestickSeries'.

Connection:

How can I create 1 chart that represent an array of points rather than creating a multiple charts that represent different value.... What can you recommend to use instead of ForEach...

Challenge: