%% auteur : gh
100 setxunit
-1 3 setxrange
-1 2 setyrange
/cosa {pi 6 div Cos} def
/sina {pi 6 div Sin} def
/F {0 0} def
/M {cosa sina} def
/Mx {cosa 0} def
/Hx {2 0} def
/H {2 sina} def
traceaxes
axesarrow
1.7 setcurvelinewidth
continu
bleu
H Hx droite
16 setfontsize
setTimesItalic
(F) F dltext
(D) Hx 0 -1 addv ultext
1.2 setcurvelinewidth
rouge
[M H] points
setTimesItalic
(M) M ultext
(H) H crtext
F M (-) line
pointilles
M H (-) line
0.7 setcurvelinewidth
noir
M Mx (-) line
continu
/arrowangle -5 store
1 0 F M 0.4 (->) tripointarc
setSymbol
(q) F pi 12 div dup Cos exch Sin 0.4 mulv addv crtext
<tex>
$$
d-\rho\cos\theta
$$
</tex>
M H milieu [1.5 1.5] uctexlabel
<tex>
$$
d
$$
</tex>
F Hx milieu [1.5 1.5] dctexlabel
<tex>
$$
\rho
$$
</tex>
F M milieu [1.5 1.5] {30} uctexlabel
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