artist-vaporize-lineartist-vaporize-line is a compiled Lisp function in `
artist.el'. (artist-vaporize-line X1 Y1) Vaporize (erase) the straight line through X1, Y1. Do this by replacing the characters that forms the line with `artist-erase-char'. Output is a list of endpoints for lines through X1, Y1. An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y).