贪吃蛇大作战
想要提高编程能力就要多敲代码,自己写一款小游戏是一个很不错的练习方式,接下来我们一起来完成一款经典的游戏
贪吃蛇大作战
, 在实践过程中体会面向对象的优点
游戏流程
1.初始化游戏窗口
# 初始化 Pygame
pygame.init()
# 设置游戏界面大小、背景颜色和游戏标题
screen_width = 640
screen_height = 480
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('贪吃蛇')
# 定义颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
snake_size = 20
# 定义一个计时器来控制蛇的移动速度
clock = pygame.time.Clock()
2.定义相关类
定义snake类
class snake(object):
# 初始化蛇的初始位置、大小和速度
def __init__(self):
self.snake_x = 100
self.snake_y = 100
self.snake_size = 20
self.snake_speed = 5
# 定义蛇的移动方向
snake_direction = 'right'
# 定义一个列表来保存蛇的身体坐标
snake_body = []
def move_(self, snake_direction):
if snake_direction == 'up':
self.snake_y -= self.snake_speed
elif snake_direction == 'down':
self.snake_y += self.snake_speed
elif snake_direction == 'left':
self.snake_x -= self.snake_speed
elif snake_direction == 'right':
self.snake_x += self.snake_speed
self.snake_direction=snake_direction
self.snake_body.insert(0, [self.snake_x, self.snake_y])
每移动一步,将新的头部坐标加入snake_body[0],后面会有更新身体操作
定义food类
# 定义食物的大小
food_size = 20
#定义食物类
class food(object):
def __init__(self,food_x,food_y):
self.food_x = food_x
self.food_y = food_y
#检测食物是否被吃
def ate(self, snake):
snake_x = snake.snake_x
snake_y = snake.snake_y
food_x = self.food_x
food_y = self.food_y
if (snake_x == food_x and snake_y == food_y) or (snake_x == food_x and abs(snake_y - food_y) < snake_size) or (
snake_y == food_y and abs(snake_x - food_x) < snake_size):
self.food_x = random.randrange(0, screen_width - snake_size, 10)
self.food_y = random.randrange(0, screen_height - snake_size, 10)
snake.snake_body.append([snake_x, snake_y])
蛇吃到食物的3种情况
- 蛇头坐标和食物坐标重合(snake_x == food_x and snake_y == food_y)
- 蛇从左右两侧碰到食物(snake_x == food_x and abs(snake_y - food_y) < snake_size)
- 蛇从上下两侧碰到食物 snake_y == food_y and abs(snake_x - food_x) < snake_size)
3.游戏的主体部分
1.定义一个draw函数
# 定义一个函数来绘制蛇和食物
def draw(snake, food):
screen.fill(BLACK)
for pos in snake.snake_body:
pygame.draw.rect(screen, GREEN, [pos[0], pos[1], snake_size, snake_size])
print(food.food_x, food.food_y)
pygame.draw.rect(screen, RED, [food.food_x, food.food_y, food_size, food_size])
pygame.display.update()
函数最开始一定要进行screen.fill(BLACK),清空整个窗口,因为pygame.display.update()是在原来的基础上进行更新,会保留蛇和食物的痕迹
2.main()函数
# 主循环
def main(snake,food):
while True:
snake_direction = snake.snake_direction
# 处理事件
for event in pygame.event.get():
if event.type == pygame.QUIT:
# 退出游戏
pygame.quit()
quit()
# 处理按键事件
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
snake_direction = 'up'
elif event.key == pygame.K_DOWN:
snake_direction = 'down'
elif event.key == pygame.K_LEFT:
snake_direction = 'left'
elif event.key == pygame.K_RIGHT:
snake_direction = 'right'
# 移动蛇的头部
snake.move_( snake_direction)
# 判断是否吃到食物
food.ate(snake)
# 更新蛇的身体坐标
if len(snake.snake_body) > 1:
snake.snake_body.pop()
# 判断游戏是否结束
snake_x = snake.snake_x
snake_y = snake.snake_y
food_x = food.food_x
food_y = food.food_y
snake_body = snake.snake_body
if snake_x < 0 or snake_x > screen_width - snake_size or snake_y < 0 or snake_y > screen_height - snake_size or [
snake_x, snake_y] in snake_body[1:]:
# 游戏结束,显示分数并等待退出
font = pygame.font.Font(None, 36)
text = font.render('Score: ' + str(len(snake_body)), True, WHITE)
screen.blit(text, ((screen_width - text.get_width()) / 2, (screen_height - text.get_height()) / 2))
pygame.display.update()
pygame.time.wait(2000)
pygame.quit()
quit()
# 绘制蛇和食物
draw(snake, food)
# 控制蛇的移动速度
clock.tick(20)
游戏结束的2种情况
1.蛇撞墙(snake_x < 0 or snake_x > screen_width - snake_size or snake_y < 0 or snake_y > screen_height - snake_size)
2.蛇吃自己 ([ snake_x, snake_y] in snake_body[1:])
4.成果展示
到这里游戏以及圆满完成了,来看看运行效果
完整代码
import pygame
import random
# 初始化 Pygame
pygame.init()
# 设置游戏界面大小、背景颜色和游戏标题
screen_width = 640
screen_height = 480
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('贪吃蛇')
# 定义颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
snake_size = 20
# 定义一个计时器来控制蛇的移动速度
clock = pygame.time.Clock()
class snake(object):
# 初始化蛇的初始位置、大小和速度
def __init__(self):
self.snake_x = 100
self.snake_y = 100
self.snake_size = 20
self.snake_speed = 5
# 定义蛇的移动方向
snake_direction = 'right'
# 定义一个列表来保存蛇的身体坐标
snake_body = []
def move_(self, snake_direction):
if snake_direction == 'up':
self.snake_y -= self.snake_speed
elif snake_direction == 'down':
self.snake_y += self.snake_speed
elif snake_direction == 'left':
self.snake_x -= self.snake_speed
elif snake_direction == 'right':
self.snake_x += self.snake_speed
self.snake_direction=snake_direction
self.snake_body.insert(0, [self.snake_x, self.snake_y])
# 定义食物的大小
food_size = 20
#定义食物类
class food(object):
def __init__(self,food_x,food_y):
self.food_x = food_x
self.food_y = food_y
def ate(self, snake):
snake_x = snake.snake_x
snake_y = snake.snake_y
food_x = self.food_x
food_y = self.food_y
if (snake_x == food_x and snake_y == food_y) or (snake_x == food_x and abs(snake_y - food_y) < snake_size) or (
snake_y == food_y and abs(snake_x - food_x) < snake_size):
self.food_x = random.randrange(0, screen_width - snake_size, 10)
self.food_y = random.randrange(0, screen_height - snake_size, 10)
snake.snake_body.append([snake_x, snake_y])
# 定义一个函数来绘制蛇和食物
def draw(snake, food):
screen.fill(BLACK)
for pos in snake.snake_body:
pygame.draw.rect(screen, GREEN, [pos[0], pos[1], snake_size, snake_size])
print(food.food_x, food.food_y)
pygame.draw.rect(screen, RED, [food.food_x, food.food_y, food_size, food_size])
pygame.display.update()
# 主循环
def main(snake,food):
while True:
snake_direction = snake.snake_direction
# 处理事件
for event in pygame.event.get():
if event.type == pygame.QUIT:
# 退出游戏
pygame.quit()
quit()
# 处理按键事件
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
snake_direction = 'up'
elif event.key == pygame.K_DOWN:
snake_direction = 'down'
elif event.key == pygame.K_LEFT:
snake_direction = 'left'
elif event.key == pygame.K_RIGHT:
snake_direction = 'right'
# 移动蛇的头部
snake.move_( snake_direction)
print(1)
# 判断是否吃到食物
food.ate(snake)
print(2)
# 更新蛇的身体坐标
if len(snake.snake_body) > 1:
snake.snake_body.pop()
# 判断游戏是否结束
snake_x = snake.snake_x
snake_y = snake.snake_y
food_x = food.food_x
food_y = food.food_y
snake_body = snake.snake_body
if snake_x < 0 or snake_x > screen_width - snake_size or snake_y < 0 or snake_y > screen_height - snake_size or [
snake_x, snake_y] in snake_body[1:]:
# 游戏结束,显示分数并等待退出
font = pygame.font.Font(None, 36)
text = font.render('Score: ' + str(len(snake_body)), True, WHITE)
screen.blit(text, ((screen_width - text.get_width()) / 2, (screen_height - text.get_height()) / 2))
pygame.display.update()
pygame.time.wait(2000)
pygame.quit()
quit()
# 绘制蛇和食物
print(3)
draw(snake, food)
# 控制蛇的移动速度
clock.tick(20)
if __name__ == "__main__":
main( snake(),food(random.randrange(0, screen_width - snake_size, 20),random.randrange(0, screen_width - snake_size, 20)))
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