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% circlespeedprofile.mp
% L. Nobre G.
% 2012
prologues := 1;
beginfig(1);
numeric u, s, a, ai, as, af, dist, b, ray;
pen one;
pair poi, ref, tip, cen, contactpoi, toppoi;
u = 10cm;
s = 0.5;
ai = 270;
as = -8;
af = -90-as;
one = pencircle scaled 0.015u;
draw (-0.5u*(1+s,1))--(u,-0.5u) withpen one withcolor 0.5white;
draw fullcircle scaled u withpen one;
contactpoi = (0,-0.5u);
toppoi = (0,0.5u);
cen = 0.5*(contactpoi+toppoi+(s*u,0));
ray = abs( cen-toppoi );
draw fullcircle scaled 2ray shifted cen withpen one withcolor red;
ref = (0,-0.5u);
ahangle := 30;
ahlength := 0.03u;
for a=ai step as until af:
poi := 0.5u*dir(a);
dist := abs( poi-ref );
tip := poi+s*dist*dir(0.5*a-45);
drawarrow poi--tip;
endfor;
% path prof;
% prof = for a=ai step as until af:
% hide( poi := 0.5u*dir(a);
% dist := abs( poi-ref);
% tip := (poi+s*dist*dir(0.5*a-45));
% drawarrow poi--tip;)
% tip.. endfor cycle;
% draw prof withpen one withcolor red;
endfig;
end.
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