/usr/share/texmf-texlive/metapost/slideshow/pathalong.mp is in texlive-metapost 2009-15.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | %% 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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