ref: db4fa883438f3910a3287320f42ae4aae42cc73b
parent: 524e19eee808837873435f908fd9b80a372673f8
author: rodri <rgl@antares-labs.eu>
date: Sun Jul 18 11:18:55 EDT 2021
add a line clipping procedure based on the Liang-Barsky algorithm. (thanks jmi2k!)