an object falls onto a body moving in a circular path

"""An object falls onto another object moving in a circular path and stays on it without falling off"""
import sys, os, pygame
from pygame.locals import *
from standard_object_creator import *
from math import sin, cos, pi, radians

SCREENW = 800
SCREENH = 700

pygame.init()
FPSCLOCK = pygame.time.Clock()

FONT1= "data\Cookie-Regular.ttf"

if sys.platform == 'win32' or sys.platform == 'win64':
    #os.environ['SDL_VIDEO_CENTERED'] = '2'# center of screen
    os.environ['SDL_VIDEO_WINDOW_POS'] = "%d,%d" % (10,30)#top left corner

SCREEN = pygame.display.set_mode((SCREENW, SCREENH))
pygame.display.set_caption('rotating object')

BLUE = (0, 50, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
PURPLE = (145, 0, 100)
yellow = (220,220,  0)

FPS = 160  # frames per second


platforms = pygame.sprite.Group()
boxes = pygame.sprite.Group()

## this is the center of rotation. objects will be placed on the radius according to the step
cx = SCREENW / 2 # x pos in relation to screen width
cy = SCREENH / 2 # y pos in relation to screen height

## self, posx, posy, imagelist, speedx = 0, speedy = 0, value = 0
plat = pygame.image.load("platform.png").convert_alpha()
box = pygame.image.load("box.png").convert_alpha()

box = object_factory ([box], cx, cy - 300, 0, 2)

boxes.add(box)

RADIUS = 100 # distance from the center
angle = radians(0)  # angular distance between objects
omega = 1
for x in xrange(1):
    xpos = (cos(angle * x) * RADIUS) + cx
    ypos = (sin(angle * x) * RADIUS) + cy
    obj = object_factory([plat], xpos, ypos)
    obj.cx = cx
    obj.cy = cy
    obj.angle = radians(60 * x) # position each object around (cx,cy)
    obj.radius = RADIUS  # distance from the center
    obj.omega = radians(omega)
    obj.offsetx = cos(obj.angle) * obj.radius
    obj.offsety = -sin(obj.angle) * obj.radius
    platforms.add(obj)

mouseposlist = []
okkoma = [platforms, boxes]

l = []
x = 0
rotations = 0
while True:  #x < 360:

    SCREEN.fill(BLACK)
    x += 1
    if x >= 360:
        rotations += 1
        x = 0
        print "rotations=", rotations
    #print box.speedy, obj.speedy
    ##--------------------------------------------------------------
    pygame.event.pump()
    keys = pygame.key.get_pressed()
    for event in pygame.event.get():
        if event.type == MOUSEBUTTONDOWN:
            if event.button == 1:
                pos = pygame.mouse.get_pos()
                val = [pos[0], pos[1], 0, 0]
                print val
                mouseposlist.append(val)
            elif event.button == 3 and mouseposlist != []:
                mouseposlist.pop(-1)

        if event.type == KEYDOWN and event.key == K_ESCAPE:
            print mouseposlist
            pygame.quit()
            sys.exit()

        #elif event.type == KEYDOWN and event.key == K_RIGHT:
            #box.speedx += 10


        #elif event.type == KEYDOWN and event.key == K_LEFT:
            #box.speedx -= 10

        #elif event.type == KEYDOWN and event.key == K_UP:
            #box.speedy -= 5


        #elif event.type == KEYDOWN and event.key == K_DOWN:
            #box.speedy += 5

        #else:
            #box.speedx = 0
    #print box.speedx, box.speedy, obj.speedx, obj.speedy

    for hp in boxes:
        hp.move()
        hp.collide(platforms)

    ## MOVE THE SPRITE IN A CIRCLE center of rotation = cx,cy. Each object is placed by varying the step)

    for obj in platforms:

        obj.angle += obj.omega  # larger value increases speed ( angle gets larger)
        #obj.radius += .1  # this will make the object move in an expanding spiral
        obj.offsetx = cos(obj.angle) * obj.radius
        obj.offsety = -sin(obj.angle) * obj.radius
        obj.difx = obj.offsetx - obj.rect.x
        obj.dify = obj.offsety - obj.rect.y
        obj.speedx = round(obj.cx + obj.difx, 2)
        obj.speedy = round(obj.cy + obj.dify, 2)

        obj.move()

    l.append([round(box.speedx - obj.speedx, 2), round(box.speedy - obj.speedy, 2)])

    for ekak in okkoma:
        ekak.update()
        ekak.draw(SCREEN)

    ## --------------------------------------------------------------------
    pygame.draw.line(SCREEN, BLUE, (0, SCREENH / 2), (SCREENW, SCREENH / 2), 2)
    pygame.draw.line(SCREEN, BLUE, (SCREENW / 2, 0), (SCREENW / 2, SCREENH), 2)
    pygame.draw.circle(SCREEN, BLUE, (cx, cy), RADIUS, 2)


    pygame.display.update()
    FPSCLOCK.tick(FPS)


    pygame.time.wait(0)

print l