Zimoz/fix root center in screen

[zhuzimoo]

resolves #17

• change the parameters in set_viewport() function in update_viewport_position() in simulation
• make the screen to keep track of the center of the root

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.75%. Comparing base (e4cbf0e) to head (b37aa79).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/sim/simulation/sim.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #31   +/-   ##
=======================================
  Coverage   89.75%   89.75%           
=======================================
  Files          13       13           
  Lines        1532     1532           
=======================================
  Hits         1375     1375           
  Misses        157      157           

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