artist-pen-lineartist-pen-line is a compiled Lisp function in `
artist.el'. (artist-pen-line X1 Y1) Draw a line from last pen position to X1, Y1. The character is replaced with the character in `artist-fill-char'. This will store all points in `artist-key-poly-point-list' in reversed order (I assume it is faster to cons to the beginning of the list than to append to the end of the list, when doing free-hand drawing).