Présentation de ellipse_jardinier.jps

%% auteur : gh
100 setxunit
-2.5 2.5 setxrange
-1.5 1.5 setyrange

/O {0 0} def
/a 2 def
/b 1 def
/c {a 2 exp b 2 exp sub sqrt} def
/F {c neg 0} def
/F' {c 0} def
/Dx {a 2 exp c div neg 0} def
/Dx' {a 2 exp c div 0} def
/D {Dx Dx 0 1 addv} def
/D' {Dx' Dx' 0 1 addv} def


/X {Cos a mul} def
/Y {Sin b mul} def

traceaxes
axesarrow
16 setfontsize
setTimesItalic
   (O) O dltext

2 setlinewidth
rouge
0 pi 2 mul settrange
{X} {Y} courbeparam

1.2 setlinewidth
continu
bleu
[F F'] points
setTimesItalic
(F) F dctext
(F') F' dctext

noir
setTimesItalic
(a) a 0 urtext
(b) 0 b urtext

1.2 setlinewidth
/t {pi 3 div} def
/M {t dup X Y} def

noir
setTimesItalic
(M) M urtext

vert
F M (-) line
F' M (-) line