1. 创建游戏窗口
2. 绘制贪吃蛇与食物
3. 蛇吃食物

# 现在就开始我们的代码，首先，还是导入模块

``````import pygame
import random
import copy
``````

# 1. 创建游戏窗口

### 1.1 游戏初始化

``````pygame.init()
clock = pygame.time.Clock()  # 设置游戏时钟
pygame.display.set_caption("贪吃蛇-解答、源码、相关资料可私信我")  # 初始化标题
screen = pygame.display.set_mode((500, 500))  # 初始化窗口 窗体的大小为 500  500
``````

### 1.2 初始化蛇的位置 蛇的长度 10 10 也就是蛇的 X Y 坐标

``````snake_list = [[10, 10]]
``````

### 初始小蛇方向

``````move_up = False
move_down = False
move_left = False
move_right = True
``````

### 1.3 初始化食物的位置

``````x = random.randint(10, 490)
y = random.randint(10, 490)
food_point = [x, y]
``````

### 1.4 开启游戏循环

``````running = True
while running:
# 游戏时钟 刷新频率
clock.tick(20)
``````

### 1.5 填充背景为白色

``````screen.fill([255, 255, 255])
``````

### 1.6 绘制背景

``````for x in range(0, 501, 10):
pygame.draw.line(screen, (195, 197, 199), (x, 0), (x, 500), 1)
pygame.draw.line(screen, (195, 197, 199), (0, x), (500, x), 1)
food_rect = pygame.draw.circle(screen, [255, 0, 0], food_point, 15, 0)
``````

### 1.7绘制蛇

``````snake_rect = []
for pos in snake_list:
# 1.7.1 绘制蛇的身子
snake_rect.append(pygame.draw.circle(screen, [255, 0, 0], pos, 5, 0))
``````

# 2. 绘制贪吃蛇与食物

### 2.1 获取蛇的长度，移动蛇的身子

``````pos = len(snake_list) - 1
while pos > 0:
snake_list[pos] = copy.deepcopy(snake_list[pos - 1])
pos -= 1
``````

### 2.2 更改蛇头位置

``````if move_up:
snake_list[pos][1] -= 10
if snake_list[pos][1] < 0:
snake_list[pos][1] = 500

if move_down:
snake_list[pos][1] += 10
if snake_list[pos][1] > 500:
snake_list[pos][1] = 0

if move_left:
snake_list[pos][0] -= 10
if snake_list[pos][0] < 0:
snake_list[pos][0] = 500

if move_right:
snake_list[pos][0] += 10
if snake_list[pos][0] > 500:
snake_list[pos][0] = 0
``````

### 2.3 键盘控制移动职位

``````for event in pygame.event.get():
# print(event)
# 判断按下的按键
if event.type == pygame.KEYDOWN:
# 上键
if event.key == pygame.K_UP:
move_up = True
move_down = False
move_left = False
move_right = False
# 下键
if event.key == pygame.K_DOWN:
move_up = False
move_down = True
move_left = False
move_right = False
# 左键
if event.key == pygame.K_LEFT:
move_up = False
move_down = False
move_left = True
move_right = False
# 右键
if event.key == pygame.K_RIGHT:
move_up = False
move_down = False
move_left = False
move_right = True
``````

### 2.4 获取蛇的长度，移动蛇的身子

``````pos = len(snake_list) - 1
while pos > 0:
snake_list[pos] = copy.deepcopy(snake_list[pos - 1])
pos -= 1
``````

# 3. 蛇吃食物

### 3.1 碰撞检测 如果蛇吃掉食物

``````if food_rect.collidepoint(pos):
# 贪吃蛇吃掉食物
snake_list.append(food_point)
# 重置食物位置
food_point = [random.randint(10, 490), random.randint(10, 490)]
food_rect = pygame.draw.circle(screen, [255, 0, 0], food_point, 15, 0)
break
``````

### 3.2 如果蛇吃掉了自己

``````head_rect = snake_rect[0]
count = len(snake_rect)
while count > 1:
if head_rect.colliderect(snake_rect[count - 1]):
running = False
count -= 1

pygame.display.update()
``````

THE END