this post was submitted on 05 Jul 2023
1 points (100.0% liked)

TeX typesetting

106 readers
1 users here now

A place to share ideas, resources, tips, and hacks for Donald Knuths typesetting software TeX. All variants and formats like OpTeX, LaTeX and ConTeXt are welcome.

Tagging your post with [] is optional, but can help others to know if it uses or pertains to a certain format/engine/system.

Rules: Posts and comments should be civil and somehow related to *TeX and/or typesetting in general.

founded 1 year ago
MODERATORS
 

There's this guy called Stephan V. Bechtolsheim who wrote a series of books on TeX called "TeX in Practice". He's really good at the finer details of, well, everything.

In one of the books, he makes a macro to visualize boxes. It's built up over many pages and chapters with lots of small macros as building blocks. Because he's reusing these macros in different places, it makes a lot of sense.

However, when I wanted to use the box visualizing macro, I found that I had to look up and copy a lot of code to make it work. This was no fun, so I re-wrote it in a "flatter" way where it's just regular plain old macros.

I ended up with this:

\newdimen\linethickness \linethickness=0.4pt

\def\boxlines #1{%
    \hbox{%
        % Save original (argument) box
        \setbox0 = #1%
        % Place bullet at baseline and vertical align of the box
        \setbox1 = \hbox{\hskip -2.5pt \lower 2.5pt \hbox{$\circ$}}%
        \ht1=0pt \dp1=0pt \wd1=0pt
        \box1
        % Place a dashed line at baseline
        \setbox2 = \hbox to \wd0{%
            \xleaders\hbox to 4pt{%
                \hskip 1pt
                \vrule depth 0.5\linethickness 
                	   height 0.5\linethickness 
                	   width 2pt
                \hfil
            }%
            \hfil
        }%
        \ht2=0pt \dp2=0pt \wd2=0pt 
        \box2
        % Place frame
        \setbox 3 = \hbox{%         
            \hskip -0.5\linethickness
            \vrule width \linethickness height \ht0 depth \dp0% 
            \hskip \wd0% 
            \hskip -\linethickness
            \vrule width \linethickness height \ht0 depth \dp0% 
            \hskip -\wd0% 
            \hskip -\linethickness
            \dimen0 = \wd0% 
            \advance\dimen0 by \linethickness
            \dimen2 = \ht0% 
            \advance\dimen2 by 0.5\linethickness
            \dimen4 = \ht0% 
            \advance\dimen4 by -0.5\linethickness
            \dimen4 = -\dimen4
            \vrule width \dimen0 height \dimen2 depth \dimen4
            \hskip -\dimen0
            \dimen2 = \dp0% 
            \advance\dimen2 by -0.5\linethickness
            \dimen2 = -\dimen2
            \dimen4 = \dp0% 
            \advance\dimen4 by 0.5\linethickness
            \vrule width \dimen0 height \dimen2 depth \dimen4
        }%
        \ht3=0pt \dp3=0pt \wd3=0pt 
        \box3
        % Place original argument box
        \box0
    }%
}

The macro takes a box as an argument, for example \boxlines{\box0}

It puts lines around the box, and marks out the baseline and the horizontal alignment. The neat thing is that the lines are made so that they don't interfere with the typesetting at all. Everything is placed as it would be without the lines.

If you have something that looks misaligned or strange, like these words:

it can help to visualize the boxes:

no comments (yet)
sorted by: hot top controversial new old
there doesn't seem to be anything here