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%% draw some text (t) along a curve (p)
vardef pathalong (expr _p, t) =
save l, ll, del,let, pos, p;
picture let, ll;
path del, p;
l := length(t) - 1;
pos = 0;
p := _p;
ll := nullpicture;
for i := 0 upto l:
let := substring (i,i+1) of t infont defaultfont scaled defaultscale;
addto ll also (let rotated(angle(direction pos of p)))
shifted point pos of p;
del := (((xpart urcorner let, infinity)--(xpart urcorner let, -infinity))
rotated(angle(direction pos of p)))
shifted point pos of p;
p := subpath(pos,length(p)) of p;
pos := ypart (del intersectiontimes p);
exitif pos <= 0;
endfor;
ll
enddef;
%% draw the text contained in t so that the bottoms of the letters are on
%% the base-line and the tops abut path p
vardef textunder(expr p,t) =
save l, ll, pos, h, i;
picture l, ll;
numeric pos, h, i;
ll := nullpicture;
pos := 0;
for i = 0 upto (length t - 1):
l := substring(i, i+1) of t infont defaultfont scaled defaultscale;
h := ypart urcorner l;
if h > 0:
addto ll also (l yscaled ((ypart (((pos,-infinity)--(pos,infinity)) intersectionpoint p)) / ypart ulcorner l)) shifted (pos, 0);
fi;
pos := pos + xpart lrcorner l;
endfor;
ll
enddef;
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