Dynamic block diagram - QGraphicsView, QML ? Where to start ?

Goofy

Hi QT Forum,
I'm revamping an old project mde by someone else where there was an area with a dynamic diagram (see image below). In other words, I could move my green blocks and connect inputs/outputs easily.

Honestly, I do not know where to start. Here are my requirements :

Dynamic edition of the diagram (drag & drop, etc).
Blocks with inputs/outputs defined by the dev.
"Automatic" connection.

In other words, I want something +/- similar to Labview or GNURadio (for those who know those tools).

Where should I start ? QGraphicsView ? QML stuff ?

alt text

mrjj

Hi and welcome
What about
http://doc.qt.io/qt-5/qtwidgets-graphicsview-diagramscene-example.html
It has most of what you need for such editor.

for

Blocks with inputs/outputs defined by the dev.

For this you need some spec file for each item. Maybe use xml or json for that.
I assume you already have something in place ?

Goofy

Hi mrjj,
Yes, for inputs/outputs, there is a kind of spec file (a simple .txt with inputs/outputs and a few parameters). But, it was left undocumented, Windows-only, etc. So yes, I was thinking about an XML specification file to configure my block.

Thanks for your link, I'll have a look at it.

mrjj

@Goofy
Ok. xml or json both very easy to work with in Qt.
Might be overkill though depending on the spef files complexity.

Christlike

@Goofy how did you solve the dynamic block diagram queries? Please insight on how you implemented the solutions, I am very interested in the subject. Cheers!