Am 01.09.22 um 15:40 schrieb Taco Hoekwater:
Adding grouping makes sense:def Moire(expr size)(text densities)=begingroup endgroup As that at least makes it an expression instead of a statement list. But also depthless() is never defined?
Oops, I forgot to copy that part (confusing source...)
It still doesn’t compile:
---
\setupbodyfont[plex,ss,8bp]
\startreusableMPgraphic{moiree}
% 1994 by Bogusław Jackowski (GUST)
defaultfont := "\truefontname{Sans}";
pickup pencircle scaled 0.3bp;
defaultscale := .8;
linecap := butt;
labeloffset := 1.5bp;
defaultthickness:=.3bp; % 5 pixels at 1200 dpi
% tertiarydef p ulshiftedto s = p shifted (s-ulcorner(p)) enddef;
vardef depthless(expr p) =
save p_; picture p_;
p_:=p if string p: infont defaultfont scaled defaultscale fi;
setbounds p_ to (xpart(llcorner p_),0)--(xpart(lrcorner p_),0)--
urcorner(p_)--ulcorner(p_)--cycle;
p_
enddef;
def Moire(expr size)(text densities)=
begingroup
save dn,a,b,k,labit,n,p,q,s,xs;
n := 32;
dn := 0;
for i := densities:
d[incr dn] := abs(i);
if i>1: labit[dn]:=1; fi
endfor
a := min(d[1],d[dn]);
b := max(d[1],d[dn]);
image(
for i=-n upto n:
draw (0,i*in/a)--(size,i*in/b);
%withpen pencircle scaled 3/5defaultthickness;
endfor
for i=1 upto dn:
k:=(a/d[i]-1)/(a/b-1);
if known labit[i]:
string s; s:=decimal(d[i]); xs:=0;
picture p,q; q := p := depthless(s);
if i=dn:
q := depthless(s & " lpi");
xs := width(q)-width(p);
fi
label.top(q, (k*size+1/2xs, n*in/a+1.5mm));
fi
draw (k*size, n*in/a+1.5mm)--(k*size, k[n*in/a,n*in/b]+.5mm);
draw (k*size, -n*in/a-1.5mm)--(k*size, -k[n*in/a,n*in/b]-.5mm);
endfor
)
endgroup;
enddef;
draw Moire(57.5mm)(200, 175, 150, 125, 100, 75);
% ulshiftedto (142mm, 38.5mm);
\stopreusableMPgraphic
\starttext
\reuseMPgraphic{moiree}
\stoptext
moireetest.tex
Description: TeX document
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