Re: [Matplotlib-users] Smooth animations

[Michael D. <md...@st...>]

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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