Merge pull request #2 from menghuan007/master

fuck
half finished lens light
Merge pull request #6 from Sorrow17/master

Add a function called "draw_lens_on"
Merge pull request #7 from OnlineOpticLaboratory/master

Merge pull request #2 from menghuan007/master
Merge pull request #8 from Sorrow17/master

a bug fix for self-testing draw_lens.py
80% lens
a
add lens_drawing in the main function