issues with rotations

I wrote a little program to get an understanding of the rotation of objects
and have not been able to get things to work as I would like. I cannot get
objects rotate about their centers. Believe is some code where I am trying
to get a sphere to rotate about the x-axis while maintaining a 2 unit
distance from the yz-plane.


Any assistance would be greatly appreciated.

from visual import *
from time import sleep

#create a set of axes for a visual reference when rotating
xaxis=cylinder(pos=(0,0,0), axis=(5,0,0), color=(1,0,0), radius=0.2)
yaxis=cylinder(pos=(0,0,0), axis=(0,5,0), color=(0,1,0), radius=0.2)
zaxis=cylinder(pos=(0,0,0), axis=(0,0,5), color=(0,0,1), radius=0.2)

#create the ball to be rotated
ball = sphere(pos=(2,2,0), radius = 0.5)

#set rotation angle for 1/20 of a rotation
rotationAngle = 6.28/20.0

#have the ball rotate about the x-axis while
#maintaining 2 units from the xy-plane

for i in range(20):
    ball.rotate(angle=rotationAngle, pos=(2,0,0), axis=(1,0,0))
    sleep(0.2)

thanks again,

Mike

-- 
Michael Zittlow
Mathematics Department Chairperson
Southern Door High School
Brussels, WI 54204

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