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+% make a (fairly large) font chart
+
+\newlinechar=`@
+\message{@Name of the font to chart = }
+\read-1 to \fontname
+
+\font\f=\fontname at .75in
+\f
+
+% Here's the best way I know to discover character height and depth
+% when they are possibly negative.
+\fontdimen5\f=-10000pt % a new (rather small) xheight
+\textfont0=\f
+\newdimen\h \newdimen\d % will be set to the character's height, depth
+\def\htdp#1{\setbox0=\hbox{\char#1}\h=-\ht0
+ \setbox0=\hbox{\accent#1\char#1}\advance\h\ht0 \advance\h-10000pt
+ \setbox0=\null \wd0=-10000pt % in case the character has a charlist!
+ \setbox0=\hbox{$\mathaccent#1{\box0}$}%
+ \d=\ht0 \advance\d-10000pt \advance\d-\h}
+
+% (By the way, my previous best was this:
+% \textfont15=\f % use family "F
+% \fontdimen8\tenex=0pt % set defaultrulethickness zero
+% \setbox1=\null \ht1=-10000pt \setbox2=\null \dp3=-10000pt
+% \newdimen\d \newdimen\h \newcount\n
+% \n=#1 \advance\n"F00
+% \setbox0=\hbox{$\radical\n{\copy1}$}
+% \d=\dp0 \advance\d-5000pt \advance\d\d %\showthe\d
+% \setbox0=\hbox{$\radical\n{\copy2}$}
+% \h=\ht0 \advance\h-5000pt \advance\h-.5\d
+% \ifdim\h>0pt \h=.5\h \fi
+% ....very tricky! But it works only when height+depth is positive.)
+
+\tracinglostchars=0
+\nopagenumbers
+
+\def\testrow#1#2{\setbox0=\hbox{\penalty1\def\\{\char'#1#2}%
+ \\0\\1\\2\\3\\4\\5\\6\\7\global\chardef\p=\lastpenalty}} % p=1 if none there
+
+\raggedbottom
+\baselineskip=1in
+\topskip=.75in
+\newdimen\w \w=.75in
+\headline={\vtop{\hbox{\tt\fontname\unskip, page \folio\hfil}
+ \kern-.75in\unitsdigits}\hss}
+\footline={\unitsdigits\hss}
+\def\unitsdigits{\hbox{\kern.3in \tt
+ \hbox to\w{\ \ 0\hss}%
+ \hbox to\w{\ \ 1\hss}%
+ \hbox to\w{\ \ 2\hss}%
+ \hbox to\w{\ \ 3\hss}%
+ \hbox to\w{\ \ 4\hss}%
+ \hbox to\w{\ \ 5\hss}%
+ \hbox to\w{\ \ 6\hss}%
+ \hbox to\w{\ \ 7\hss}}}
+
+\def\row#1#2{\testrow#1#2%
+\ifnum\p=0\hbox{\hbox to.3in{\tt#1#2\hfil}%
+ \mod#1#20\mod#1#21\mod#1#22\mod#1#23\mod#1#24\mod#1#25\mod#1#26\mod#1#27%
+ \hbox to.3in{\tt\hfil#1#2}}\fi}
+
+\newdimen\pixel \pixel=.00333333in
+\def\mod#1#2#3{\chardef\c='#1#2#3 \htdp\c
+ \setbox0=\hbox{\penalty1\c\global\chardef\p=\lastpenalty}%
+ \ifnum\p=1 \hbox to\w{}\else
+ \setbox2=\hbox{\c\/}%
+ \hbox to\w{\kern-\pixel \vrule width\pixel height\h depth\d
+ \copy\leftbox\copy0\copy\rightbox
+ \vrule width\pixel height\h depth\d \kern-\pixel \kern-\wd0
+ \raise\h\vbox{\hrule height\pixel width\wd0}\kern-\wd0
+ \lower\d\vbox{\hrule height0pt depth\pixel width\wd0}\kern-\wd0
+ \ifdim\wd2>\wd0 \kern\wd2\raise\h\copy\icbox \fi
+ \hss}\fi}
+
+\newbox\leftbox % marking the baseline at the left
+\setbox\leftbox=\hbox{\kern-\pixel\vrule width\pixel height4pt
+ \vrule height0pt depth\pixel width4pt \kern-4pt}
+\newbox\rightbox % marking the baseline at the right
+\setbox\rightbox=\hbox{\kern-4pt\vrule height0pt depth\pixel width4pt
+ \vrule width\pixel height4pt \kern-\pixel}
+\newbox\icbox % the mark of an italic correction
+\setbox\icbox=\hbox{\kern-4pt\vrule height\pixel width4pt depth0pt
+ \vrule width\pixel depth4pt}
+
+\row00 \row01 \row02 \row03 \row04 \row05 \row06 \row07
+\row10 \row11 \row12 \row13 \row14 \row15 \row16 \row17
+\row20 \row21 \row22 \row23 \row24 \row25 \row26 \row27
+\row30 \row31 \row32 \row33 \row34 \row35 \row36 \row37
+\bye