There is nothing available to push points -- matplotlib uses Numpy
arrays internally for the data, and they can not be (efficiently)
resized. I would try implementing this before assuming it's too slow.
Mike
On 07/05/2013 12:02 PM, v0idnull wrote:
Yes, but this is where I am failing. I don't have the code with me
right now but I can explain it:
I get a new number every 2000 milliseconds, and I want to update the
graph say, every 50 milliseconds, and keep a minute of history visible
in the graph.
So that's 30 x-axis ticks.
But if I want to draw this out smoothly, I need 40 more ticks per
update interval. I have five lines I want to show, so every 50ms, 600
points need to be plotted out.
Now, my proof of concept code is just working with arrays in a sort of
FIFO queue, I haven't actually tried to plug those arrays into
matplotlib, but it seems like replotting 600 points is a lot of work.
Maybe I am over reacting? Or is there some feature of matplotlib that
allows me to push data onto a plot instead of replotting all points?
I dunno, I'm not confident in my approach. I seek inspiration.
thanks,
--alex
This means that every 50ms, 600 points need to be updated.
On 13-07-04 05:11 PM, Michael Droettboom wrote:
I see -- you want to basically interpolate between points? I don't
think there's anything built in to matplotlib to do that, but you
could always do that interpolation outside and just update the graph
more often.
Mike
On 07/04/2013 04:28 PM, v0idnull wrote:
eh....
Let me explain my problem in a different way:
Every two seconds I get a value from a service. Let's say I over 8
seconds I get 1, 5, 10, 5 as values.
So if my application updates the graph every two seconds, this will
look choppy and ugly. This is because every two seconds, an entire
line is added onto the graph between the two points.
Imagine if I could control the drawing of said line though. If I
could draw the individual pixels of the line every couple of ticks
instead of just dumping a line in every two seconds, I will end up
with a nice smooth animation. It may not be 100% real time anymore,
but my focus on this personal project of mine is vanity, not
practicality ;)
I hope this better explains what I am trying to accomplish...
Thanks,
--alex
On 13-07-04 04:09 PM, Michael Droettboom wrote:
Have you looked at the simple_anim.py example -- other than the
networking piece, it seems to do what you describe, and it's pretty
fast. Maybe start from that and make changes until it gets slow in
order to determine where the slowness comes from...?
Mike
On 07/03/2013 09:19 PM, v0idnull wrote:
I am receiving a number from a server every two seconds. I would
like to plot this number.out over time for the past say... 30 polls.
Would it be possible to use... Anything, to produce a smooth
animation of the plot line getting drawn? As it stands now the
animation is well... Quite choppy. ;)
I'm using pygame currently to render my graphs on this full screen
application I'm making just for my self. I am not bound to it
though if there are better linux-only things out there.
Thanks in advance,
--alex
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