Graphical user input
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Yes, Qt is suitable to do such a 'graphical editor'. The best way to do this however depends on your exact use case.
You can check out e.g. the UML editor that is part of Qt Creator (also written in Qt): https://doc.qt.io/qtcreator/creator-modeling.html
There are also small examples using QGraphicsView: http://doc.qt.io/qt-5/qtwidgets-graphicsview-diagramscene-example.html
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@nasir said in Graphical user input:
Pspice or labview
There is already such software based on Qt. It allows create virtual instruments almost like LabVIEW does. But it has some advantages over other systems - it is multi-platform, based on plugins, uses powerful extendable scripting language, interactive scripting debugger and much much more. But for while it works only on Russian language. There are plans translate it to English and other languages. This requires funding therefore will be done when non-Russian customer will appear. If you represent the company looking for this software then we can talk about this. If you are serious in this interest then write me chat message from my profile page.