如何在pygame中将每个圆圈连接到左上角？

import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((800, 600))

circle_pos = [(100, 100), (200, 200), (300, 300)]
circle_radius = 50

def draw_circles():
    for pos in circle_pos:
        pygame.draw.circle(screen, (255, 0, 0), pos, circle_radius)
        pygame.draw.line(screen, (0, 0, 255), pos, (0, 0))

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    screen.fill((255, 255, 255))
    draw_circles()
    pygame.display.update()