如何在pygame中制作一个按钮显示和更新图像？

import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Button Example")

class Button:
    def __init__(self, x, y, width, height, inactive_color, active_color, text):
        self.rect = pygame.Rect(x, y, width, height)
        self.inactive_color = inactive_color
        self.active_color = active_color
        self.text = text

    def draw(self, screen):
        pygame.draw.rect(screen, self.inactive_color, self.rect)
        font = pygame.font.Font(None, 36)
        text = font.render(self.text, True, (255, 255, 255))
        text_rect = text.get_rect(center=self.rect.center)
        screen.blit(text, text_rect)

    def is_clicked(self, pos):
        return self.rect.collidepoint(pos)

button = Button(300, 250, 200, 100, (0, 0, 255), (0, 255, 0), "Click Me")

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.MOUSEBUTTONDOWN:
            if button.is_clicked(pygame.mouse.get_pos()):
                # 按钮被点击时的操作
                print("Button Clicked")

    screen.fill((255, 255, 255))
    button.draw(screen)
    pygame.display.flip()