Normally, I think visual presentations of programming languages, such as Labview, are more a problem than a solution, but there is one case where I don’t think that’s the case: when the program is operating on a stream of data, and the program should be able to be changed without stopping the stream. The canonical use case for this, in my opinion, is realtime operation on a video stream. In this case, you can watch the video output change in realtime as operations are added, removed, and modified.
What I was hoping to do, at some point, is to write a set of operations for video that are wrappers for e.g. GStreamer, and by putting them in a visual programming framework. That would give me a set of VJing operations that can be played with in realtime to do things like chromakeying a live video stream on human skin colors or dropping swirling masks on all the faces detected in the video stream.
Pyqtgraph has a lot of promise as a framework for this. My main desire for the framework is that I don’t have to deal with things like handling mouse clicks, and can just get a description of the pipeline and shove data through it. It may be someone already did this, but firtree.org is dead, so maybe it doesn’t matter if they did.