Databases
StackOverflow2013
Postsdbo
POMatplotlib animate fill_between shape
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POMatplotlib animate fill_between shape
    primarykey
    data
    text
    <p>I am trying to animate a fill_between shape inside matplotlib and I don't know how to update the data of the PolyCollection. Take this simple example: I have two lines and I am always filling between them. Of course, the lines change and are animated.</p> <p>Here is a dummy example:</p> <pre><code>import matplotlib.pyplot as plt # Init plot: f_dummy = plt.figure(num=None, figsize=(6, 6)); axes_dummy = f_dummy.add_subplot(111); # Plotting: line1, = axes_dummy.plot(X, line1_data, color = 'k', linestyle = '--', linewidth=2.0, animated=True); line2, = axes_dummy.plot(X, line2_data, color = 'Grey', linestyle = '--', linewidth=2.0, animated=True); fill_lines = axes_dummy.fill_between(X, line1_data, line2_data, color = '0.2', alpha = 0.5, animated=True); f_dummy.show(); f_dummy.canvas.draw(); dummy_background = f_dummy.canvas.copy_from_bbox(axes_dummy.bbox); # [...] # Update plot data: def update_data(): line1_data = # Do something with data line2_data = # Do something with data f_dummy.canvas.restore_region( dummy_background ); line1.set_ydata(line1_data); line2.set_ydata(line2_data); # Update fill data too axes_dummy.draw_artist(line1); axes_dummy.draw_artist(line2); # Draw fill too f_dummy.canvas.blit( axes_dummy.bbox ); </code></pre> <p>The question is how to update the fill_between Poly data based on line1_data and line2_data each time update_data() is called and draw them before blit ("# Update fill data too" &amp; "# Draw fill too"). I tried fill_lines.set_verts() without success and could not find an example...</p> <p>Thanks!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USdenfromufa
    1. USSebastian
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou may need to delete and fully re-draw every frame. The `*collection` objects do not play nice with updating. The reason is that they have thrown away all of the meta-data that would allow you to map between data-space and draw-space, and just keep a list of what to draw. This is a trade off to render them quickly.
      singulars
      1. POMatplotlib animate fill_between shape
      1. UStacaswell
    2. CODo you mean to use f_dummy.canvas.draw() inside update_data? I started with this but unfortunately I need a fast plotting since I am processing and playing a signal in real-time and I need the plotting not to affect the playback (calling draw() stalls the playback). If you know a fast threading trick to redraw everything while playing the sounds, would be nice - I called draw with threading.start(...). I know there are other faster plotting libraries but I prefer sticking to matplotlib and the restore/blit trick worked fast enough for me.
      singulars
      1. POMatplotlib animate fill_between shape
      1. USSebastian
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload