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Hi Mike,
Have you tried blitting? That prevents the draw from redrawing everything
on the plot, allowing it to only redraw the single line that's moving,
which should help any issues with speed. See some of the
examples<http://matplotlib.org/examples/animation/index.html>with
FuncAnimation and also a Q&A using the draw method
here<https://stackoverflow.com/questions/8955869/why-is-plotting-with-matplotlib-so-slow/8956211#8956211>,
which might work more smoothly with QTimer.
Ray
On Sat, Apr 19, 2014 at 12:56 AM, Michael Mossey <mic...@gm...>wrote:
> I'm creating a simple little sound file editor, which includes the ability
> to play a sound file as a vertical line (a "cursor") moves across the plot
> of the waveform in sync with the sound. So the trick is, how to create this
> moving line. First I tried FuncAnimation, but I had problems with the
> synchronization with the sound. I'm guessing that the animation
> capabilities of matplotlib weren't really designed to be synchronized with
> outside activities. So then I tried using QTimer's and modifying the Line2D
> instance that is the vertical bar. This didn't work unless I called draw()
> on the figure canvas every time I modified the Line2D, which caused
> slowdown (probably because my audio data consists of 1000's of points).
>
> So is there a way to animate a vertical line moving across the plot with
> good control over exact timing, in the presence of other plots with
> thousands of points?
>
> Mike
>
>
>
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Dear all,
Did anyone try to make plots using matplotlib, and then put the figure in
the powerpoint for presentation? Currently I am using the ipython notebook
--pylab mode to make the plots, and then save them to *jpg format. But when
I put it into the powerpoint, it does not look nice as I see on the screen
(a little bit blurred). You can really not notice it if you don't examine
carefully. But I really want to make high quality slides. So does anyone
have the same problem? could it be related with the figure format or
backend (GTKAgg) currently I am uisng? thanks a lot in advance.
Cheers,
Chao
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I'm creating a simple little sound file editor, which includes the ability
to play a sound file as a vertical line (a "cursor") moves across the plot
of the waveform in sync with the sound. So the trick is, how to create this
moving line. First I tried FuncAnimation, but I had problems with the
synchronization with the sound. I'm guessing that the animation
capabilities of matplotlib weren't really designed to be synchronized with
outside activities. So then I tried using QTimer's and modifying the Line2D
instance that is the vertical bar. This didn't work unless I called draw()
on the figure canvas every time I modified the Line2D, which caused
slowdown (probably because my audio data consists of 1000's of points).
So is there a way to animate a vertical line moving across the plot with
good control over exact timing, in the presence of other plots with
thousands of points?
Mike