Thank you- that’s very helpful indeed. I will have a go a rewriting using layers and animation.

Thanks JonB,

Can you animate scene_drawings?

I have succesfully managed to create a standalone using the Xcode PythonistaAppTemplate with a fairly simple script. I have another script I wish to turn into an app that uses shapenodes and spritenodes in an animated scene within a custom UI component. However when I run the stand alone version created by Xcode i get the following error:

'NoneType' object has no attribute 'line_width'

at the point of insatantiation - None of my nodes seem to work :-( Are nodes implemented in the Xcode template?

Many thanks for any help.

Thanks for you comments brumm. Yes indeed - I've written it on an original iPad Air - and it does get a bit jittery if you stress it. That's why I've called it a scrolling graph and not an oscilloscope! It serves the function for which I've written it which is to act as a simulator for a medical monitor. Perhaps there is a more efficient solution to the problem?

Hello everyone - new to Pythonista, GitHub and all. I have made a foray into pythonista coding with this offering: https://gist.github.com/13a36a95cfee655b4ff88445a53e476d

It is a horizontal scrolling graph custom UI. Grateful for comments...