mandi (30dec14)

git-svn-id: svn://tug.org/texlive/trunk@35931 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 10 insertions, 7 deletions

diff --git a/Master/texmf-dist/doc/latex/mandi/vdemo.py b/Master/texmf-dist/doc/latex/mandi/vdemo.py
index b50f0c35eea..6af517625a1 100644
--- a/Master/texmf-dist/doc/latex/mandi/vdemo.py
+++ b/Master/texmf-dist/doc/latex/mandi/vdemo.py
@@ -1,22 +1,25 @@
-from __future__ import print_function, division
+from __future__ import division,print_function
 from visual import *
 
-giant = sphere(pos=vector(-1e11,0,0),radius=2e10,mass=2e30,color=color.red)
-giant.p = vector(0, 0, -1e4) * giant.mass
+G = 6.7e-11
 
+# create objects
+giant = sphere(pos=vector(-1e11,0,0),radius=2e10,mass=2e30,color=color.red)
+giant.p = vector(0,0,-1e4) * giant.mass
 dwarf = sphere(pos=vector(1.5e11,0,0),radius=1e10,mass=1e30,color=color.yellow)
 dwarf.p = -giant.p
 
-for a in [giant, dwarf]:
-  a.orbit = curve(color=a.color, radius=2e9)
+for a in [giant,dwarf]:
+  a.orbit = curve(color=a.color,radius=2e9)
 
 dt = 86400
 while 1:
   rate(100)
   dist = dwarf.pos - giant.pos
-  force = 6.7e-11 * giant.mass * dwarf.mass * dist / mag(dist)**3
+  force = G * giant.mass * dwarf.mass * dist / mag(dist)**3
   giant.p = giant.p + force*dt
   dwarf.p = dwarf.p - force*dt
-  for a in [giant, dwarf]:
+  for a in [giant,dwarf]:
     a.pos = a.pos + a.p/a.mass * dt
     a.orbit.append(pos=a.pos)
+