fix coordinates in animate_2d

[gregordecristoforo]

Fix #41 2d animations use correct x and y coordinates.

[codecov[bot]]

Codecov Report

Merging #81 (f0c67b0) into main (38a0725) will increase coverage by 3.69%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   95.55%   99.25%   +3.69%     
==========================================
  Files           7        6       -1     
  Lines         315      267      -48     
  Branches       41       38       -3     
==========================================
- Hits          301      265      -36     
+ Misses         13        2      -11     
+ Partials        1        0       -1     

see 1 file with indirect coverage changes

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[gregordecristoforo]

Since the plotting isn't covered by the tests, I don't mind ignoring the code coverage.

[gregordecristoforo]

I excluded the plotting.py module from the code coverage