Polygon area in GUI

[ZoeJacky]

1. enable user to choose the option to show the area information of the polygon drawn by to target path and to center path;
2. add test cases to _area() function
3. refactor the notebook area_calculation.ipynb

[codecov[bot]]

Codecov Report

Merging #241 (9c0df63) into main (1dd7f46) will increase coverage by 0.15%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #241      +/-   ##
==========================================
+ Coverage   89.65%   89.80%   +0.15%     
==========================================
  Files          19       19              
  Lines        1546     1570      +24     
==========================================
+ Hits         1386     1410      +24     
  Misses        160      160              

Files Changed	Coverage Δ
src/vstt/display.py	100.00% <ø> (ø)
src/vstt/stats.py	98.74% <100.00%> (+0.13%)	:arrow_up:
src/vstt/vis.py	95.49% <100.00%> (+0.16%)	:arrow_up:
src/vstt/vtypes.py	98.66% <100.00%> (+0.01%)	:arrow_up:

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication