обнаружение столкновений в pygame между draw.circle и draw.rect

Есть ли способ обработать обнаружение столкновений между draw.circle и draw.rect?

Если я попытаюсь использовать обнаружение столкновения спрайтов, то будет сказано, что у круга нет атрибутов прямоугольника.

Создаю двух игроков: прямоугольники. Создаю один шар: круг. Я хотел бы как можно лучше справиться со столкновением двух игроков с мячом. Не могли бы вы помочь?

Я представляю свой код ниже:

# DATE: 090215

TWO PLAYERS
CONTROL VIA KEYBOARD OR MOUSE
#
import pygame, sys
from pygame.constants import MOUSEMOTION, K_LEFT, K_RIGHT, K_DOWN, K_UP

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

SCREENW = 800
SCREENH = 600
SCREEN = pygame.display.set_mode((SCREENW,SCREENH),0,32)

WHITE = (255,255,255)
BLACK = (0,0,0)
BLUE = (0,70,160)
RED = (255,0,0)
RECTH = 100
RECTW = 30
#players
PLAYER1P = (0,((SCREENH - RECTH)/2),RECTW,RECTH)
PLAYER2P = ((SCREENW-RECTW),((SCREENH - RECTH)/2),RECTW,RECTH)
# BALLS append with a ball for collision detection purposes
BALLS = []
# PLAYERS append with players for collision detection purposes
PLAYERS = []
# CLASS TO DEFINE PLAYER
class PlayerSprite(pygame.sprite.Sprite):
# define object atributes
    def __init__(self,x,y,rwidth,rheight):
        pygame.sprite.Sprite.__init__(self)    
        self.x = x
        self.y = y   
        self.width = rwidth
        self.height = rheight
# define object behavior
    def update(self,control,Surface,color):
        key = pygame.key.get_pressed()
        self.control = control
        if self.control == 1:               
            self.y = pygame.mouse.get_pos()[1]
            if self.y >= SCREENH - RECTH:
                self.y = SCREENH - RECTH
        if self.control == 0:
            dist = 20
            if key[pygame.K_DOWN]:
                self.y += dist
            if key[pygame.K_UP]:
                self.y -= dist
            if key[pygame.K_LEFT]:
                None
            if key[pygame.K_RIGHT]:
                None
            if self.y >= SCREENH - RECTH:
                self.y = SCREENH - RECTH
            if self.y <= 0:
                self.y = 0
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    pygame.quit()
                    sys.exit() 
    # draw player as a rectangle 
    # the important bit is that here you can change player shape
        self.player = pygame.Rect(self.x,self.y,self.width,self.height)
        pygame.draw.rect(Surface,color,self.player)

class CircleSprite(pygame.sprite.Sprite):
# define object atributes 
    def __init__(self,x,y,rwidth,rheight,speedx,speedy):
        pygame.sprite.Sprite.__init__(self)    
        self.x = x
        self.y = y
        self.speedx = speedx
        self.speedy = speedy
        self.width = rwidth
        self.height = rheight

# define object behavior 
    def update(self,Surface,color):
        #self.control = control
        #if self.control == 1:               
        #        self.y = pygame.mouse.get_pos()[1] 
        self.x += self.speedx
        self.y += self.speedy
   # draw player as a rectangle
   # the important bit is that here you can change player shape
        pygame.draw.circle(Surface, color, (self.x, self.y), self.width, 0)

 # main function 
def main():
# CREATE PLAYER OBJECT before WHILE loop 
    prec1 = PlayerSprite(0,SCREENH/2 - RECTH/2,RECTW,RECTH)
    prec2 = PlayerSprite(SCREENW - RECTW,SCREENH/2 - RECTH/2,RECTW,RECTH)
    prec3 = CircleSprite(SCREENW/2,SCREENH/2,RECTW/3,RECTH/3,10,5)

    PLAYERS.append(prec1)
    PLAYERS.append(prec2)
    BALLS.append(prec3)
    while True:
    # update OBJECT position 
        SCREEN.fill(WHITE) 
        # 0 = KEYBOARD
        # 1 = MOUSE       
        prec1.update(0,SCREEN,BLUE)
        prec2.update(1,SCREEN,BLACK)
        prec3.update(SCREEN,RED)
        # check collision
        is_a_collision = pygame.sprite.collide_mask(prec1,prec3)
        if is_a_collision:
            print "Boom1"
        # change direction
        if prec3.x >= SCREENW or prec3.x <= 0:
            prec3.speedx = - prec3.speedx
        if prec3.y >= SCREENH or prec3.y <= 0:
            prec3.speedy = - prec3.speedy
        pygame.display.update()  
        clock.tick(50)
    pygame.quit()
main()