tsem­lines – Sup­port for the an­cient \em­line macro

Oc­ca­sional Doc­u­ments ap­pear, that use graph­ics gen­er­ated by tex­cad from the em­tex dis­tri­bu­tion.
Th­ese doc­u­ments of­ten use the \em­line macro, which pro­duced lines at an ar­bi­trary ori­en­ta­tion. The present pack­age em­u­lates the macro, us­ing TikZ.