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以下是一个简单的Python Pygame绘图游戏示例:

import pygame
import random

# 初始化Pygame
pygame.init()

# 设置游戏窗口大小
WINDOW_WIDTH = 800
WINDOW_HEIGHT = 600
WINDOW_SIZE = (WINDOW_WIDTH, WINDOW_HEIGHT)

# 创建游戏窗口
screen = pygame.display.set_mode(WINDOW_SIZE)

# 设置游戏标题
pygame.display.set_caption("绘图游戏")

# 设置颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

# 设置字体
font = pygame.font.SysFont(None, 36)

# 设置计分
score = 0

# 退出游戏函数
def game_quit():
    pygame.quit()
    exit()

# 游戏循环
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_quit()

    # 绘制背景
    screen.fill(WHITE)

    # 随机绘制图形
    shape_num = random.randint(1, 3)
    if shape_num == 1:
        pygame.draw.circle(screen, BLUE, (random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT)), random.randint(10, 50))
    elif shape_num == 2:
        pygame.draw.rect(screen, RED, (random.randint(0, WINDOW_WIDTH-100), random.randint(0, WINDOW_HEIGHT-50), 100, 50))
    else:
        pygame.draw.polygon(screen, GREEN, [(random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT)), (random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT)), (random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT))])

    # 判断是否点击到图形
    if event.type == pygame.MOUSEBUTTONDOWN and event.button == 1:
        pos = pygame.mouse.get_pos()
        if shape_num == 1:
            if pygame.Rect(pos[0]-50, pos[1]-50, 100, 100).colliderect(pygame.draw.circle(screen, BLUE, (random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT)), random.randint(10, 50))):
                score += 10
        elif shape_num == 2:
            if pygame.Rect(pos[0], pos[1], 1, 1).colliderect(pygame.draw.rect(screen, RED, (random.randint(0, WINDOW_WIDTH-100), random.randint(0, WINDOW_HEIGHT-50), 100, 50))):
                score += 20
        else:
            if pygame.Rect(pos[0], pos[1], 1, 1).colliderect(pygame.draw.polygon(screen, GREEN, [(random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT)), (random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT)), (random.randint(0, WINDOW_WIDTH), random.randint(0, WINDOW_HEIGHT))])):
                score += 30

    # 显示当前得分
    score_text = font.render("Score: %d" % score, True, BLACK)
    screen.blit(score_text, (20, 20))

    # 刷新屏幕
    pygame.display.update()

运行代码后，将会出现一个800x600的绘图游戏窗口，每次随机绘制一个圆形、长方形或三角形，并在点击到图形时计分，判断点击到的方法为使用colliderect()检测点击位置和绘制出的图形是否相交。