line.py

           __ 
          / /\ 
         / /  \ 
        / /    \__________ 
       / /      \        /\ 
      /_/        \      / / 
   ___\ \      ___\____/_/_ 
  /____\ \    /___________/\ 
  \     \ \   \           \ \ 
   \     \ \   \____       \ \ 
    \     \ \  /   /\       \ \ 
     \   / \_\/   / /        \ \ 
      \ /        / /__________\/ 
       /        / /     / 
      /        / /     / 
     /________/ /\    / 
     \________\/\ \  / 
                 \_\/jiri
                  
        3d X-Y matrix