Make dynamic graph

Raghvendra

Hey there, I need to make dynamic graph using qt or qml, so please suggest me what should I use either QT or QML and please suggest me library also.

J.Hilk

Hi,

since Qt 5.7, I would suggest Qt Charts it was previously commercial-only, but is now included in Qt under GPLv3 license for open source users.

Besides that, QCustomPlot is popular.

Both are cpp suggestions as I'm not yet really familiar with QML and the options you have there :).

Raghvendra

@J.Hilk okay thanks

mrjj

@Raghvendra

I can highly recommend QCustomPlot as its easy to get going with.

Raghvendra

@mrjj will try with it, right now I am trying with qml's chartview.

mrjj

@Raghvendra said in Make dynamic graph:

chartview.

Ahh, yes. That should also be very easy to get going :)

Raghvendra

@mrjj I am not finding any way to insert data dynamically

LineSeries {
visible:tempVisibilty
id:temperature
name: "Temperature"
XYPoint { x: 0; y: 0 }
XYPoint { x: 1.1; y: 2.1 }
XYPoint { x: 1.9; y: 3.3 }
XYPoint { x: 2.1; y: 2.1 }
XYPoint { x: 2.9; y: 4.9 }
XYPoint { x: 3.4; y: 3.0 }
XYPoint { x: 4.1; y: 3.3 }

like here the number of XYPoint is fixed but i need to send it dynamically and update my graph as well

mrjj

@Raghvendra said in Make dynamic graph:

Hi
Sadly im not into QML so i do not know directly
but
http://doc.qt.io/qt-5/qtcharts-qmloscilloscope-example.html
seems very dynamic?

I think you will need c++ for it but not sure.

Give it some time, maybe others know easy way.

VRonin

@Raghvendra My standard answer to this question:

create a QStandardItemModel in C++ and expose it to qml, use a model mapper for the chart (for example VXYModelMapper) and now you can change the contents of the model dynamically and the changes will be reflected in the chart

Raghvendra

@VRonin Thanks Man, going to try it

Raghvendra

Can you give me an example for implement QStandardItemModel with qml graph or something like this