Re: [matplotlib-devel] animation of a fill_between region

[Mauricio C. <moc...@gm...>]

Thank you Jake.

I will take a look at this example with care.

Cheers!


On Sun, Feb 2, 2014 at 2:10 PM, Jacob Vanderplas
<ja...@cs...>wrote:

> Hi Mauricio,
> Patch objects are a bit more difficult to work with than line objects,
> because unlike line objects are a step removed from the input data supplied
> by the user.  There is an example similar to what you want to do here:
> http://matplotlib.org/examples/animation/histogram.html
>
> Basically, you need to modify the vertices of the path at each frame.  It
> might look something like this:
>
> from matplotlib import animation
> import numpy as np
> import matplotlib.pyplot as plt
>
> fig, ax = plt.subplots()
> ax.set_xlim([0,10000])
>
> x = np.linspace(6000.,7000., 5)
> y = np.ones_like(x)
>
> collection = plt.fill_between(x, y)
>
> def animate(i):
>     path = collection.get_paths()[0]
>     path.vertices[:, 1] *= 0.9
>
> animation.FuncAnimation(fig, animate,
>                         frames=25, interval=30)
>
> Take a look at path.vertices to see how they're laid out.
> Hope that helps,
>    Jake
>
>
> On Sat, Feb 1, 2014 at 7:44 AM, Mauricio Calvao <moc...@gm...>wrote:
>
>> Hi there,
>>
>> I have the following simple code to plot a (static)  fill_between region
>> in a given plot.
>>
>>
>> import numpy as np
>> import matplotlib. pyplot as plt
>>
>> plt.figure()
>> ax=plt.axes()
>> ax.set_xlim([0,10000])
>>
>> x = np.linspace(6000.,7000.)
>> y = np.ones(np.shape(x))
>>
>> plt.fill_between(x,y)
>>
>>
>> I would like now to animate this band (which is a PolyCollection object,
>> and not a Line2D one) so that it moves smoothly to the right up together
>> with being stretched, that is, to the new x positions: .7200, 8400. I saw
>> several animations in the matplotlib homepage, but they only looped over
>> line or image objects, not polycollection ones, such as fill_between... Is
>> this possible?
>>
>> In stackoverflow there is this link:
>> http://stackoverflow.com/questions/16120801/matplotlib-animate-fill-between-shape,
>> which might solve this question but I was not able to understand it fully
>> in order to have a simple minmal working example. If that is the right
>> direction, I would appreciate immensely if someone could provide such an
>> example!
>>
>> Thanks in advance
>>
>> --
>> #######################################
>> Prof. Mauricio Ortiz Calvao
>> Federal University of Rio de Janeiro
>> Institute of Physics, P O Box 68528
>> CEP 21941-972 Rio de Janeiro, RJ
>> Brazil
>>
>> Email: or...@if...
>> Phone: (55)(21)25627483
>> Homepage: http://www.if.ufrj.br/~orca
>> #######################################
>>
>>
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>


-- 
#######################################
Prof. Mauricio Ortiz Calvao
Federal University of Rio de Janeiro
Institute of Physics, P O Box 68528
CEP 21941-972 Rio de Janeiro, RJ
Brazil

Email: or...@if...
Phone: (55)(21)25627483
Homepage: http://www.if.ufrj.br/~orca
#######################################