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input graph
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
numeric r,last; path c,w;
r:=5; c:=fullcircle scaled 2r;
last:=0.0;
def wedge (expr lang,value,perc) =
numeric current,n,half,xoff,yoff;
picture p;
n:=perc*3.6;
current:=last+n; half:=last+(n/2);
w:=buildcycle((0,0)--(2r,0) rotated last,
c, (2r,0)--(0,0) rotated current);
gfill w withcolor (0,0.8-(perc/100),0);
gdraw w;
if perc > 5:
p = lang infont defaultfont
scaled defaultscale;
glabel(image(unfill bbox p; draw p),
3/4r*dir(half));
fi;
last:=current;
enddef;
draw begingraph(3in,3in);
defaultscale:=0.7;
gdata ("langs.dat",c,
wedge(c1, (scantokens c2),
(scantokens c3)););
autogrid(,); frame withcolor white;
endgraph;
endfig;
end;
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