On 1/30/2026 9:53 AM, Jeong Dal via ntg-context wrote:
Hi, Hans,
It is great to see the result of defining fonts of Logic gates.
Also, I learn your clever way of drawing logic gates a lot from your code.
It was just a quick hack. I cleaned it up a bit.
Last year, I need to make a short manuscript of logic which contains the logic
gates and Karnaugh Map for high school teachers.
You may remember that I asked a lot to use Lua and MetaFun to draw Karnaugh map.
You helped a lot and I am able to draw them more easily.
Later, I found a Karnaugh Map module!
At that time, another huddle is to draw logic gates. I draw it one by one that
is a real time consuming job, and connecting those gates with lines is another
trial and error job.
I wonder if the flowchart module could help you there. After all there
we have shapes, connecting lines, etc.
There are so many math symbols like \infty, \sum, etc.
Is it possible to define them like math symbols to use them \logicNot,
\logicOr, …
It depends on how you use the font. We basically hook them into a
regular font.
BTW, logic gates is used to draw a circuit diagram, so it is another way to use
them as figure.
I believe that you find the best way of using it.
For circuit diagram there are cad-like programs that also validate the
design.
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------%D \module
%D [ file=meta-imp-logicsymbols,
%D version=2026.01.29,
%D title=\METAPOST\ Graphics,
%D subtitle=Logic Symbols,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
This module is a quick and dirty answer to a (few) question(s) on the mailing
list
asking for a font that has such symbols. Here we show how to use \METAFUN\ to
meet this demand.
that shows how to make a font
\startMPcalculation{simplefun}
path Logic[] ;
Logic[30] := (0,1 ) -- (-1,1 ) ;
Logic[31] := (0,0.5) -- (-1,0.5) ;
Logic[32] := (0,1.5) -- (-1,1.5) ;
Logic[33] := (2,1 ) -- ( 3,1 ) ;
Logic[34] := fullcircle scaled .4 shifted (2.2,1) -- (2.4,1) -- (3,1) ;
Logic[35] := (-.2,2) .. (.2,1) .. (-.2,0) ;
Logic[1] := (0,0) -- (1,0) .. (2,1) .. (1,2) -- (0,2) -- cycle ;
Logic[2] := (0,0) -- (2,1) -- (0,2)-- cycle ;
Logic[3] := (-.2,0) -- (1,0) .. (2,1) .. (1,2) -- (-.2,2) .. (.2,1) ..
cycle ;
Logic[4] := ( .2,0) -- (1,0) .. (2,1) .. (1,2) -- ( .2,2) .. (.6,1) ..
cycle ;
numeric LogicPenWidth ; LogicPenWidth := 1/6 ;
def LogicBUFFER =
pickup pencircle scaled LogicPenWidth ;
draw Logic[2] && Logic[30] && Logic[33] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicNOT =
pickup pencircle scaled LogicPenWidth ;
draw Logic[2] && Logic[30] && Logic[34] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicAND =
pickup pencircle scaled LogicPenWidth ;
draw Logic[1] && Logic[31] && Logic[32] && Logic[33] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicNAND =
pickup pencircle scaled LogicPenWidth ;
draw Logic[1] && Logic[31] && Logic[32] && Logic[34] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicOR =
pickup pencircle scaled LogicPenWidth ;
draw Logic[3] && Logic[31] && Logic[32] && Logic[33] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicNOR =
pickup pencircle scaled LogicPenWidth ;
draw Logic[3] && Logic[31] && Logic[32] && Logic[34] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicXOR =
pickup pencircle scaled LogicPenWidth ;
draw Logic[4] && Logic[31] && Logic[32] && Logic[33] && Logic[35] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
def LogicNXOR =
pickup pencircle scaled LogicPenWidth ;
draw Logic[4] && Logic[31] && Logic[32] && Logic[34] && Logic[35] ;
currentpicture := currentpicture shifted (1,0) ;
enddef ;
lmt_registerglyphs [
name = "symbols:logic",
units = 4,
width = 4,
height = 2,
depth = 0,
usecolor = true,
] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0xF800", code =
"LogicBUFFER;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0x00AC", code =
"LogicNOT;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0x2227", code =
"LogicAND;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0x2228", code =
"LogicOR;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0x22BC", code =
"LogicNAND;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0x22BD", code =
"LogicNOR;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0x22BB", code =
"LogicXOR;" ] ;
lmt_registerglyph [ category = "symbols:logic", unicode = "0xF801", code =
"LogicNXOR;" ] ;
\stopMPcalculation
\definefontfeature
[symbols:logic]
[default]
[metapost={category=symbols:logic}]
\definefontsynonym[LogicGates][Serif*symbols:logic]
\definesymbol[LogicBUFFER] [\getglyph{LogicGates}{\char"F800}]
\protected\def\lBUFFER{\symbol[LogicBUFFER]}
\definesymbol[LogicNOT] [\getglyph{LogicGates}{\char"00AC}]
\protected\def\lNOT {\symbol[LogicNOT]}
\definesymbol[LogicAND] [\getglyph{LogicGates}{\char"2227}]
\protected\def\lAND {\symbol[LogicAND]}
\definesymbol[LogicOR] [\getglyph{LogicGates}{\char"2228}]
\protected\def\lOR {\symbol[LogicOR]}
\definesymbol[LogicNAND] [\getglyph{LogicGates}{\char"22BC}]
\protected\def\lNAND {\symbol[LogicNAND]}
\definesymbol[LogicNOR] [\getglyph{LogicGates}{\char"22BD}]
\protected\def\lNOR {\symbol[LogicNOR]}
\definesymbol[LogicXOR] [\getglyph{LogicGates}{\char"22BB}]
\protected\def\lXOR {\symbol[LogicXOR]}
\definesymbol[LogicNXOR] [\getglyph{LogicGates}{\char"F801}]
\protected\def\lNXOR {\symbol[LogicNXOR]}
\continueifinputfile{meta-imp-logicsymbols.mkxl}
\starttext
\showglyphs
\definefont[logic][Serif*symbols:logic]
\protected\def\Gate#1{\logic \char"#1 }
\protected\def\Mate#1{\im{\Gate{#1}}}
\startTEXpage[offset=3pt]
\starttabulate[|c|c|c|c|c|c|c|c|]
\NC AND \NC NAND \NC OR \NC NOR \NC
XOR \NC NXOR \NC NOT \NC BUFFER \NC \NR
\NC \Gate{2227} \NC \Gate{22BC} \NC \Gate{2228} \NC \Gate{22BD} \NC
\Gate{22BB} \NC \Gate{F800} \NC \Gate{00AC} \NC \Gate{F801} \NC \NR
\NC \Mate{2227} \NC \Mate{22BC} \NC \Mate{2228} \NC \Mate{22BD} \NC
\Mate{22BB} \NC \NC \Mate{00AC} \NC \NC \NR
\NC \logic ∧ \NC \logic ⊼ \NC \logic ∨ \NC \logic ⊽ \NC
\logic ⊻ \NC \logic \NC \logic ¬ \NC \logic \NC \NR
\stoptabulate
\stopTEXpage
\startTEXpage[offset=3pt]
\symbol{LogicBUFFER} \symbol{LogicNOT}
\symbol{LogicAND} \symbol{LogicOR}
\symbol{LogicNAND} \symbol{LogicNOR}
\symbol{LogicXOR} \symbol{LogicNXOR}
\par \darkred
\lBUFFER\space \lNOT\space
\lAND \space \lOR \space
\lNAND \space \lNOR\space
\lXOR \space \lNXOR
\stopTEXpage
\stoptext
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