Bomb Catcher 游戏 (Pygame)

import sys, random, time, pygame
from pygame.locals import *


def print_text(font, x, y, text, color=(255, 255, 255)):
    imgText = font.render(text, True, color)
    screen.blit(imgText, (x, y))


pygame.init()#初始化
screen = pygame.display.set_mode((600, 500))#创建高600，宽500的界面
pygame.display.set_caption("Bomb Catching Game")#窗口标题
font1 = pygame.font.Font(None, 24)#数字越大 字体越大 
pygame.mouse.set_visible(False)  #隐藏或显示当前的鼠标
white = 255, 255, 255
red = 220, 50, 50
yellow = 230, 230, 50
black = 0, 0, 0
lives = 3
score = 0
game_over = True
mouse_x = mouse_y = 0
pos_x = 300
pos_y = 460
bomb_x = random.randint(0, 500)#随机产生数字
bomb_y = -50#初始炸弹在上方
vel_y = 1.7#下降速度


while True:
    for event in pygame.event.get():
        if event.type == QUIT:#叉掉窗口
            sys.exit()
        elif event.type == MOUSEMOTION:#鼠标动作
            mouse_x, mouse_y = event.pos#鼠标当前坐标
            move_x, move_y = event.rel#鼠标相对移动
        elif event.type == MOUSEBUTTONUP:
            if game_over:
                game_over = False
                lives = 3
                score = 0

        keys = pygame.key.get_pressed()#轮询键盘接口，返回一个布尔值的大列表
        if keys[K_ESCAPE]:
            sys.exit()

        screen.fill((0, 0, 100))
        if game_over:
            print_text(font1, 100, 200, "<CLICK TO PLAY>")
        else:
            bomb_y += vel_y
        if bomb_y > 500:
            bomb_x = random.randint(0, 500)
            bomb_y = -50
            lives -= 1
            if lives == 0:
                game_over = True
        elif bomb_y > pos_y:
            if (bomb_x > pos_x) and (bomb_x < pos_x+120):
                score += 10
                bomb_x = random.randint(0, 500)
                bomb_y = -50
        #pygame.draw.circle(screen, black, (bomb_x-4, int(bomb_y)-4), 30, 0)
        pygame.draw.circle(screen, yellow, (bomb_x, int(bomb_y)), 30, 0)

        pos_x = mouse_x
        if pos_x < 0:
            pos_x = 0
        elif pos_x > 500:
            pos_x = 500
        #pygame.draw.rect(screen, black, (pos_x-4, pos_y-4, 120, 40), 0)
        pygame.draw.rect(screen, red, (pos_x, pos_y, 120, 40), 0)

        print_text(font1, 0, 0, "LIVES: "+str(lives))

        print_text(font1, 500, 0, "SCORE: "+str(score))
        pygame.display.update()