Is there a way to find out about the coordinates of letters in a formatted piece of text?
Suppose the compiled text has three columns, and the letters are equally spaced. Then what I'm looking for is a command that decides, depending on its (row, column) coordinates, if a letter is printed bold, or not.
Probably things are getting clearer if I explain what it's used for. It's some sort of superimposed ASCII image, hidden in a text. When reading the text, you may notice that some characters are printed bold, some are not, in a seemingly random fashion.
When looking at the text from a distance, you see the big picture.
The dots represent regular text, while the `s' are a stand-in for bold characters.
The main challenge is that it needs to be a multi-column text which makes it harder to tell which characters need to be printed bold.
I'm heading towards using
dvitype for my needs.
But does anybody know what, e.g.
131: setchar72 h:=1310720+491521=1802241, hh:=114
might encode? What I do know is that
H according to ASCII which is the first letter of the
Hello World! tex file
Hello World! \bye
But what's the meaning of the other digits?