Re: [Matplotlib-users] Smooth animations

[v0idnull <v0i...@ps...>]

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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