Hello reader,
We are going to try handling user actions in the
HTML canvas - where our visualization occurs. We have done something like
that before but without IPython. Now it is time to try it in the
IPython notebook. We are using JavaScript for listening the events on a
canvas. So we need a protocol for sending this events to Vispy from
JavaScript. Thus, we are designing a JSON protocol.
About the implementation, we are going to focus on the IPython notebook for now. It seems we have two options for that:
1- A Javascript function generates a JSON with the events, following user actions. This JSON is sent to Python via a Unicode trait in the widget. A Python callback function is automatically called when this trait is updated: it parses the JSON, generates the Event instances and passes them to Vispy.
2- We get closer to the widget machinery, following something like this.The idea is to write Python callbacks for user actions on browser's side. The widget machinery makes that possible in a clean way. Javascript is responsible
for sending the appropriate properties (those that are defined in the
JSON protocol) to the Python callbacks. The Python callback functions are responsible for raising the Vispy events.
My
mentor (Cyrille Rossant) and I think the second approach is more
elegant and straightforward. So we are concentrating on the former.
Back to the JSON protocol, we are trying to follow
the same nomenclature and hierarchy as what is currently implemented in
vispy.app. So far I wrote nearly half of it. It seems we need one or two weeks
to implement these ideas.
Next week: Finishing Touches on JSON Protocol
See you next week!
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