On 2015/06/23 10:39 AM, Eric Firing wrote:
> I would like to be able to publish plots that are updated as data are
> received by the server. I don't actually want any of the toolbar
> interactivity--I just want the updated plot to appear in the browser
> automatically. I suspect this can all be done quite easily using the
> webagg backend, but I have not yet figured it out by looking at the
> embedding_in_webagg.py example and the backend_webagg* code. I expect
> that stripping out the toolbar is straightforward, but what I don't
> understand is how to achieve the dynamic updates, preferably without
> using the animation framework, which I think would add unnecessary
> complexity.
>
> Are there any other examples floating around that would help?
>
> Thanks.
>
> Eric
To answer my own question, in case anyone else is interested, here is a
block of code that can be substituted for the corresponding elements of
the embedding_in_webagg.py example. The whole block goes at the bottom.
-------------------------------------------------
def create_figure():
fig = Figure()
ax = fig.add_subplot(1,1,1)
ax.set_xlim(0, 1)
ax.set_ylim(0, 1)
line, = ax.plot([], [], 'r-')
return fig, line
if __name__ == "__main__":
figure, line = create_figure()
application = MyApplication(figure)
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8080)
print("http://127.0.0.1:8080/";)
print("Press Ctrl+C to quit")
def update2():
line.set_data(np.random.rand(2, 25))
figure.canvas.draw_idle()
io_loop = tornado.ioloop.IOLoop.instance()
cb = tornado.ioloop.PeriodicCallback(update2, 1000)
cb.start()
io_loop.start()
----------------------------------------------------------
Instead of the using the PeriodicCallback I will probably be using
ZMQStream.on_recv() to register a callback on a socket, but that doesn't
change the basic structure.
Eric
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