Measure along / within ROIs

Not sure if this is within the scope of the project, but it would be nice to be able to measure along ROIs (e.g. a "profile line" through that moves through space in one (more, eventually?) axis. Through lines, it could be a profile line. With polygons, it could be average intensity (or any other function that takes a set of pixels and returns a number), or a profile line along the circumference of the shape.

Something like this as an example of the profile line:

I worked on something like this a couple of years ago, and might give it a shot when I have the time, but I thought I'd leave this here so I could remember, and if it inspired anyone else to give it a shot since I think it'd be very useful!

Nell'issue non sono indicati file, test o entry point. Inizia esaminando gli entry point esistenti del repository per ROI e plotting, quindi chiarisci se i profili di linea, l'aggregazione dei poligoni e i profili della circonferenza rientrano nell'ambito. L'attività deve considerarsi completata quando le misurazioni ROI supportate e il loro comportamento previsto sono definiti esplicitamente.