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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
404945709 MDExOlB1bGxSZXF1ZXN0MjQ5MDE0MTc3 2729 [WIP] Feature: Animated 1D plots TomNicholas 35968931 closed 0     14 2019-01-30T20:15:52Z 2021-06-24T08:46:31Z 2021-06-23T16:14:28Z MEMBER   0 pydata/xarray/pulls/2729

This is an attempt at a proof-of-principle for making animated plots in the way I suggested in #2355. (Also relevant for #2030.)

This example code: ```python import matplotlib.pyplot as plt import xarray as xr

Load data as done in plotting tutorial

airtemps = xr.tutorial.open_dataset('air_temperature') air = airtemps.air - 273.15 air.attrs = airtemps.air.attrs air.attrs['units'] = 'deg C'

Downsample to make reasonably-sized gif

data = air.isel(lat=10, time=slice(None,None,40))

Create animated plot

anim = data.plot(animate_over='time') anim.save('line1.gif', writer='imagemagick') plt.show() ``` now produces this gif: ~~The units on the timeline are formatted incorrectly because this PR isn't merged yet~~

I think it looks pretty good! It even animates the title properly. The actual animation creation only takes one line to do.

This currently only works for a plot with a single line, which is animated over a coordinate dimension. ~~It also required some minor modifications/bugfixes to animatplot, so it probably isn't reproducible right out of the box yet.~~ If you want to try this out then use the develop branch of my forked version of animatplot.

The reason I've put this up is because I wanted to

  1. show people the level of complexity required, and
  2. get people's opinion on the implementation.

I feel like although it required only ~100 lines extra to do this then the logic is very fragmented and scattered through the plot.line and plot._infer_line_data functions. In 2D this would get even more complicated, but I can't see a good way to abstract the case of animation out?

(@t-makaro I expect you will be interested in this)

EDIT: To-Do list:

  • [x] Animate single line
  • [x] Animated line and static line on same axes
  • [x] Animate multiple lines on same axes
  • [x] Multiple animated line plots on same figure
  • [ ] ~~FacetGrids of multiple animated lines~~ (will leave for a later PR)
  • [ ] Complete set of tests
  • [x] Add animatplot as optional dependency
  • [x] Add new CI tests using animatplot
  • [ ] New documentation page
  • [x] Fix issues with formatting of timeline label (fixed by https://github.com/t-makaro/animatplot/pull/46)
 
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