用python写个弹球小游戏

以下是用Python实现的弹球小游戏的代码和说明：

# 引入必要的库
import pygame
import random

# 初始化pygame
pygame.init()

# 定义颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
BLUE = (50, 153, 213)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

# 设置屏幕大小
SCREEN_WIDTH = 700
SCREEN_HEIGHT = 500
screen = pygame.display.set_mode([SCREEN_WIDTH, SCREEN_HEIGHT])

# 设置游戏标题
pygame.display.set_caption("弹球小游戏")

# 定义球的类
class Ball:
    def __init__(self, x, y, radius, color):
        self.x = x
        self.y = y
        self.radius = radius
        self.color = color
        self.speed_x = random.randint(3, 6)
        self.speed_y = random.randint(3, 6)

    def draw(self):
        pygame.draw.circle(screen, self.color, [self.x, self.y], self.radius)

    def move(self):
        self.x += self.speed_x
        self.y += self.speed_y

        # 碰到左右边界反弹
        if self.x < self.radius or self.x > SCREEN_WIDTH - self.radius:
            self.speed_x = -self.speed_x

        # 碰到上边界反弹
        if self.y < self.radius:
            self.speed_y = -self.speed_y

        # 碰到下边界游戏结束
        if self.y > SCREEN_HEIGHT - self.radius:
            return True

        return False

# 定义挡板的类
class Paddle:
    def __init__(self, x, y, width, height, color):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.color = color
        self.speed = 0

    def draw(self):
        pygame.draw.rect(screen, self.color, [self.x, self.y, self.width, self.height])

    def move(self):
        self.x += self.speed

        # 碰到左右边界停止移动
        if self.x < 0:
            self.x = 0
        elif self.x > SCREEN_WIDTH - self.width:
            self.x = SCREEN_WIDTH - self.width

# 创建球和挡板对象
ball = Ball(SCREEN_WIDTH // 2, SCREEN_HEIGHT // 2, 10, WHITE)
paddle = Paddle(SCREEN_WIDTH // 2 - 50, SCREEN_HEIGHT - 20, 100, 10, GREEN)

# 设置游戏时钟
clock = pygame.time.Clock()

# 游戏循环
done = False
while not done:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                paddle.speed = -5
            elif event.key == pygame.K_RIGHT:
                paddle.speed = 5
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                paddle.speed = 0

    # 清屏
    screen.fill(BLACK)

    # 移动球和挡板
    if ball.move():
        done = True
    paddle.move()

    # 绘制球和挡板
    ball.draw()
    paddle.draw()

    # 碰撞检测
    if ball.y + ball.radius >= paddle.y and ball.x >= paddle.x and ball.x <= paddle.x + paddle.width:
        ball.speed_y = -ball.speed_y

    # 更新屏幕
    pygame.display.flip()

    # 设置游戏帧率
    clock.tick(60)

# 退出游戏
pygame.quit()