"""File:     draw_polygon_rec.py
   Purpose:  Draw a regular polygon (i.e., all sides have same length)

   Run:      python draw_polygon_rec

   Input:    n = number of sides
             length = sidelength
   Output:   Regular polygon drawn from current position of turtle
   Note:     This version uses recursion
"""
from TurtleWorld import *

def draw_polygon(t, length, n, degrees):  
   """Draw a regular polygon with n sides and sidelength length
      using turtle t
   """
   if n < 1:
      return
   else:
      fd(t, length)
      lt(t, degrees)
      draw_polygon(t, length, n-1, degrees)

# Program start here
world = TurtleWorld() # Create an instance of TurtleWorld -- i.e, a window
bob = Turtle() # Create an instance of a Turtle

n = int(raw_input("How many sides does the polygon have?\n   "))
length = int(raw_input("How long is each side?\n   "))
degrees = 360.0/n
draw_polygon(bob, length, n, degrees)

wait_for_user()