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% --- start of displayed preamble in the book ---
vardef stxp(expr s,p)=
save len,prefix,car,lab,xpos,cpos,ratio;
numeric len[];
string prefix,car;
picture lab;
len0=0;
for i:=length s step -1 until 1:
prefix:=substring(0,i) of s;
lab:=thelabel(prefix,(0,0));
len[i]=2*(xpart(urcorner lab));
endfor;
ratio=arclength(p)/len[length s];
for i=0 upto (length s)-1:
car:=substring(i,i+1) of s;
if car<>" ":
xpos:=((len[i]+len[i+1])/2)*ratio;
cpos:=arctime xpos of p;
lab:=thelabel(car,(0,0));
draw lab rotated (angle (direction cpos of p))
shifted (point cpos of p);
fi;
endfor;
enddef;
% --- end of displayed preamble in the book ---
% graphic converted to gray in book using 'color2gray'
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
path p;
p=((0,0)..(4cm,7cm)..(5cm,3cm)..(3cm,2cm)) yscaled .5;
draw p withcolor red;
stxp("IN PRINCIPIO CREAVIT DEUS CÆLUM ET TERRAM.",p);
endfig;
end;
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