[Visualpython-users] Cylinder example (a little cuter)

I am obviously way too stressed out after a couple of high stress
13 hour days in the lab.  I know I should not specify colors the
way I did.  I just find it so neat you can extract the axis of
an object by simple specifying object.axis.

Here it is, very 60's cylinder

from visual import *
from Numeric import *

length = 3.0
radius = 1.0
number_of_steps_length = 20
number_of_angle_steps = 20
length_step = length / number_of_steps_length
angle_step = 2.0 * 3.1415926 / number_of_angle_steps

scene = display(title='Cylinder',
     width=500, height=500, center=(0,0,0), range=(5,5,5))

f = frame()

for i in xrange(0,number_of_steps_length):
    x1 = i * length_step
    x2 = (i + 1) * length_step
    for j in xrange(0,number_of_angle_steps):
        theta = j * angle_step
        y1 = radius * sin(theta)
        z1 = radius * cos(theta)
        y2 = radius * sin(theta + angle_step)
        z2 = radius * cos(theta + angle_step)

        convex(frame = f,pos =
[(x1,y1,z1),(x1,y2,z2),(x2,y1,z1),(x2,y2,z2)],color = (x1,y1,z1))

for i in xrange(1,200):
    rate(5)
    f.rotate(angle = 0.02,axis = (0,1,0),origin = (0,0,0))
    f.rotate(angle = -0.1,axis=f.axis,origin = (0,0,0))


Wayne Keen