Présentation de 171.jps

%% PhS

%% 


%% échelle et étendue de l'image

60 setxunit
-3 3  setxrange
-0.5 3.5  setyrange
/xgauche -6 def    %% c'est la limite gauche de l'image

/xdroite 6 def     %% c'est la limite droite de l'image

/ybasse  -4 def    %% c'est la limite basse de l'image

/yhaute  4 def     %% c'est la limite haute de l'image


10 4 point 

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%%  DANGER !! Il ne faut pas utiliser de variables

%%  DANGER !! qui commence par les lettres :

%%  DANGER !! xmin, xmax, ymin et ymax...

%%  DANGER !! Utiliser x_min, y_min...

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%% plages initiales pour les paramètres (peuvent être modifiées pour chaque fonctions tracées

/x_min -5 def
/x_max 5 def
/t_min -9 def
/t_max 9 def


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%% procédures

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%% on donne ici x(t)

/xdet {
1 dict begin
	/t exch def
	t
end
	} def

%% on donne ici y(t)

/ydet {
1 dict begin
	/t exch def
	t abs
end
	} def


%% dessine un bout de droite

/bddroite { %% Ax Ay Bx By kg (=proportion vers A) kd (=prop vers B) 

8 dict begin
	/kd exch def
	/kg exch def
	/By exch def
	/Bx exch def
	/B {Bx By} def
	/Ay exch def
	/Ax exch def
	/A {Ax Ay} def
	gsave
	[A A B vecteur kg mulv addv A A B vecteur kd mulv addv] ligne
	grestore
end
	} def


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%% définitions des couleurs

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/coul1 {120 255 div 70 255 div 9 255 div setrgbcolor} def



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%% tracés

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%% tracé des axes et du point Origine

1 setlinewidth
15 setfontsize
noir
continu
traceaxes
marks
tracerepere


2 setlinewidth
coul1
continu
-3 3  settrange
{xdet} {ydet} courbeparam




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%% texte

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setTimesItalic