Nouvelles séries d'exemples : courbes en polaires

[mp-gdd.git] / exemples / polaires / pol03.mp

diff --git a/exemples/polaires/pol03.mp b/exemples/polaires/pol03.mp
new file mode 100644 (file)
index 0000000..6f3b6bb
--- /dev/null
+++ b/exemples/polaires/pol03.mp
@@ -0,0 +1,55 @@
+input gdd;
+input gdd-rep;
+input gdd-lbl;
+input gdd-tra;
+input svgnames;
+
+lblPreambule := "\usepackage[frenchb]{babel}"       &
+                "\usepackage[garamond]{mathdesign}" &
+                "\usepackage{amsmath}";
+
+input gdd-fct;
+input gdd-plt;
+
+labeloffset := 6;
+gddU:=1.2cm;
+
+vardef r(expr t) = 1+2*cos(t) enddef;
+
+vardef rp(expr t) = (r(t)*cos(t),r(t)*sin(t)) enddef;
+
+def traceDoubleVecteur(expr o,d)= drawdblarrow ((o-d)--(o+d)) gddEnPlace enddef;
+
+def avecCrayon(expr t,c) = withpen pencircle scaled t withcolor c enddef;
+
+
+
+beginfig(1);
+
+
+ Repere(10,10,2.2,5,2,2);
+ Axes; 
+ Debut; 
+  Graduations; Unites(1);
+
+  drawoptions(withcolor LightSlateGrey);
+
+  nb = 50;
+  pas = 4 / nb;
+  for i=1 upto nb:
+    vardef rt(expr t) = 1 + (-1+i*pas)*cos(t) enddef;
+    trace CourbeEnPolaires(rt,-Pi,Pi,100) withcolor ((i/nb)[Gainsboro,Chartreuse]);
+  endfor;
+
+  trace CourbeEnPolaires(r,-Pi,Pi,100) avecCrayon(1.5,LightSeaGreen);
+
+  pointe Point(0,0);
+  pointe Point(0,1);
+  pointe Point(0,-1);
+
+ Fin;
+
+
+endfig;
+
+end
\ No newline at end of file