Performance graph example

Cobra91151

Hello!
I want to build a performance widget using Qt to display the download progress, cpu/ram usage etc. I want something like in the screenshot below:

Should I use the QGraphicsScene or QSplineSeries with QChart to achieve it? I have/extract the actual data, but want to display it in the graphs. Thanks.

beibei

It is easier to implement with QChart and QChartView.

Cobra91151

@beibei

Good. I will try it. Thanks.

JonB

@Cobra91151
Are you already using Qt Charts in your application? If not, just checking you are OK about licensing implication.

Cobra91151

@JonB

I am working on the website now. Will check it later. What do you mean regarding Qt Charts?

JonB

@Cobra91151
I am just checking that you aware if you choose to start using Qt Charts for this then your own code has to become GPL, and therefore you must release the source code if you distribute the binary. Which you may or may not care about (e.g. if your code is only for your own use). Or buy a Qt commercial licence. Just a heads-up if it influences your decision.

Cobra91151

@JonB

Ok. This applies for all Qt versions regarding the Qt Charts or only the latest? For example, when using Qt 5.9.9?

JonB

@Cobra91151
All. Qt Charts has always been (so far as I know) GPL/Commercial, never LGPL.

I don't blame you for wishing to use Qt Charts. I would too on one project I'm working on. But that's not an option if you want to keep source closed but can't afford/don't want to pay for the commercial licence. As I said, just a heads-up before you commit to your way forward.

Cobra91151

@JonB

Good, I understand. I have not decided what to choose yet. I do not think that Qt Charts would be useful in my case. I would prefer something like this: https://www.youtube.com/watch?v=eSHTXQbPquk

I think it was done using QPainter. It should work well for Linux, but need to reimplement it for Windows. Thanks.

mrjj

@Cobra91151
Hi
Since you dont need zoom and panning etc, using QPainter should work
super.