On Jul 20, 2016, at 10:03 AM, Tom Goddard <goddard@sonic.net> wrote:

For 3, your extension could be notified on every zoom and adjust the strut and ribbon sizes. You are right this will probably be to slow to be usable for a modest size protein because I believe it will recompute the ribbon at each zoom step. The strut size changes would probably be fast enough. Maybe the ribbon resize would be for a small protein. You’d have to try it to know.

You could start a short timer when a zoom is detected and if the timer goes off without any further zoom activity (which would restart the timer) then adjust the sizes. This is how the MOTION_START / MOTION_STOP triggers in chimera/__init__.py work. You could look in that file for an example of how you would code your just-after-zoom adjustment.