如何在pygame中让圆从一个角到另一个角对角移动？

import pygame
import sys

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

circle_pos = [0, 0]  # 圆的初始位置
circle_speed = [1, 1]  # 圆的速度

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

    circle_pos[0] += circle_speed[0]
    circle_pos[1] += circle_speed[1]

    if circle_pos[0] <= 0 or circle_pos[0] >= 800:
        circle_speed[0] = -circle_speed[0]
    if circle_pos[1] <= 0 or circle_pos[1] >= 600:
        circle_speed[1] = -circle_speed[1]

    screen.fill((0, 0, 0))  # 清空屏幕
    pygame.draw.circle(screen, (255, 255, 255), circle_pos, 50)  # 绘制圆

    pygame.display.flip()

    pygame.time.Clock().tick(60)

import pygame
import sys

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

circle_pos = [0, 0]
circle_speed = [1, 1]

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

    circle_pos[0] += circle_speed[0]
    circle_pos[1] += circle_speed[1]

    if circle_pos[0] <= 0 or circle_pos[0] >= 800:
        circle_speed[0] = -circle_speed[0]
    if circle_pos[1] <= 0 or circle_pos[1] >= 600:
        circle_speed[1] = -circle_speed[1]

    screen.fill((0, 0, 0))
    pygame.draw.circle(screen, (255, 255, 255), circle_pos, 50)

    pygame.display.flip()

    pygame.time.Clock().tick(60)