Dale Fugier

I know this is kinda cheezy, since I use the RhinoScript syntax. But hey! gotta start somewhere...

Python Code:

###############################################################################
# ArchimedeanSpiral.py -- July 2011
# If this code works, it was written by Dale Fugier.
# If not, I don't know who wrote it.
#
# Change 'a_const' to turn the spiral.
# Change 'b_const' to control the distance between turnings.
 
import rhinoscriptsyntax as rs
 
def ArchimedeanSpiral():
   
    print "Archimedean Spiral: Radius = A + B * Theta"
   
    a_const = rs.GetReal("Value of A constant", 1.0, 0.01)
    if a_const is None: return
   
    b_const = rs.GetReal("Value of B constant", 1.0, 0.01)
    if b_const is None: return
   
    num_points = rs.GetInteger("Number of points to calculate", 10, 1)
    if num_points is None: return
   
    step_angle = rs.GetReal("Angle between points",  30.0, 1.0, 45.0)
    if step_angle is None: return
   
    curr_angle = 0.0
    base_point = [0.0, 0.0, 0.0]
    points = []
   
    for i in xrange(0, num_points):
           radius = a_const + (b_const * curr_angle)
           pt = rs.Polar(base_point, radius, curr_angle)
           points.append(pt)
           curr_angle = curr_angle + step_angle
   
    rs.AddInterpCurve(points)
 
##########################################################################
# Check to see if this file is being executed as the "main" python
# script instead of being used as a module by some other python script
# This allows us to use the module which ever way we want.
if( __name__ == "__main__" ):
    ArchimedeanSpiral()

Enjoy!