Stepper Motor Controller

#!/usr/bin/env python

# Import required libraries
import time
import pygame
import RPi.GPIO as GPIO

# Use BCM GPIO references
# instead of physical pin numbers
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
# Define some settings
StepCounter = 0
WaitTime = .01
steppingOne = False
steppingTwo = False
positionOne = 0
positionTwo = 0
targetOne = 0
targetTwo = 0

stepPins = []
stepPattern = []
stepPattern = range(0, 8)
stepPattern[0] = [1,0,0,0] # Starting step
stepPattern[1] = [1,1,0,0]
stepPattern[2] = [0,1,0,0] # Second step
stepPattern[3] = [0,1,1,0]
stepPattern[4] = [0,0,1,0] # Third step
stepPattern[5] = [0,0,1,1]
stepPattern[6] = [0,0,0,1] # Fourth step
stepPattern[7] = [1,0,0,1]


def moveFlap(zone, openIt): # zone is 1 or 2, openIt is true or false
    global stepPins
    if (zone==1):
        if (openIt):
            stepPins = [17,4,22,21]
        else:
            stepPins = [21,22,4,17]
    else:
        if (openIt):
            stepPins = [23,18,25,24]
        else:
            stepPins = [24,25,18,23]

def initGPIOpins():
    # Set all pins as output
    global stepPins
    stepPins = [4,17,18,21,22,23,24,25]
    for pin in stepPins:
        GPIO.setup(pin,GPIO.OUT)
        GPIO.output(pin, False)

def stepNow():
    for pin in range(0, 4):
        xpin = StepPins[pin]
        for stepCounter in range(0, 8):
            if StepPattern[stepCounter][pin]!=0:
            # print " Step %i Enable %i" %(StepCounter,xpin)
                GPIO.output(xpin, True)
            else:
                GPIO.output(xpin, False)

def moveAsRequested():
    global positionOne, targetOne, positionTwo, targetTwo
    if (positionOne != targetOne):
        steppingOne = True
        moveFlap(1, positionOne>targetOne)
        stepNow()
        if positionOne>targetOne:
            positionOne -= 4
        else:
            positionOne += 4
    elif (positionTwo != targetTwo):
        steppingTwo = True
        moveFlap(2, positionTwo>targetTwo)
        stepNow()
        if positionTwo>targetTwo:
            positionTwo -= 4
        else:
            positionTwo += 4


def main():
    pygame.init()
    initGPIOpins()
    screen = pygame.display.set_mode((640,480))
    pygame.display.set_caption("Heater Controller")
    clock = pygame.time.Clock()
    # Start main loop
    while 1==1:
        clock.tick(50)
        moveAsRequested()
    # Handle events
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                return
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_q:
                    pygame.quit()
                    return
                elif event.key == pygame.K_g:
                    targetOne=100

        screen.fill((0,0,0))
        pygame.display.flip()

  # If we reach the end of the sequence
  # start again

  # Wait before moving on
if __name__ == "__main__":
    main()