save project

snake.py

 import pygame
 import pygame
-from pygame import locals
+import sys
+import random
 
 
-# 初始化pygame，为使用硬件做准备
+#初始化pygame
 pygame.init()
 pygame.init()
 
 
-# 创建一个窗口
-screen = pygame.display.set_mode((660, 480))
+#创建一个画布
+screen = pygame.display.set_mode((800,600))
+pygame.display.set_caption('贪吃蛇')#画布名字
+cell_size = 20 #网格尺寸
+snake_head = [80,80]  #蛇头坐标
+snake_body = [[80,80],[60,80],[40,80]]  #蛇身坐标
+direction = 'right'
+change_dir = 'right'
+food = [200,200]
+flag = 1
 
 
-# 背景
-background = pygame.image.load('bg.png')
-right = pygame.image.load('right.png')
-food = pygame.image.load('apple.png')
-body = pygame.image.load('body.png')
+#创建蛇的函数
+def draw_snake(body):
+    for i in body:
+        pygame.draw.rect(screen,(0,0,255),(i[0],i[1],cell_size,cell_size))
 
 
+
+#退出程序
 while True:
 while True:
-    for event in pygame.event.get():
-        if event.type == locals.QUIT:
-            # 接收到退出事件后退出程序
-            exit()
-    # 将背景图画上去
-    screen.blit(background, (0, 0))
-    # 将贪吃蛇画上去
-    screen.blit(right, (240, 120))
-    # 将贪吃蛇的身体画上去
-    screen.blit(body, (210, 120))
-    screen.blit(body, (180, 120))
-    screen.blit(body, (180, 90))
-    # 将果实画上去
-    screen.blit(food, (360, 300))
-    # 刷新画面
-    pygame.display.update()
+    for i in pygame.event.get():
+        if i.type == pygame.QUIT:
+            pygame.quit()
+            sys.exit()
+        if i.type == pygame.KEYDOWN:
+            if i.key == pygame.K_UP:
+                change_dir = 'up'
+            if i.key == pygame.K_DOWN:
+                change_dir = 'down'
+            if i.key == pygame.K_RIGHT:
+                change_dir = 'right'
+            if i.key == pygame.K_LEFT:
+                change_dir = 'left'
+    #运动方向限制
+    if change_dir == 'right' and direction == 'left':
+        change_dir = 'left'
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+    if change_dir == 'left' and direction == 'right':
+        change_dir = 'right'
+    if change_dir == 'up' and direction == 'down':
+        change_dir = 'down'
+    if change_dir == 'down' and direction == 'up':
+        change_dir = 'up'
+    direction = change_dir
+    if direction == 'right':
+        snake_head[0] += cell_size
+    if direction == 'left':
+        snake_head[0] -= cell_size
+    if direction == 'up':
+        snake_head[1] -= cell_size
+    if direction == 'down':
+        snake_head[1] += cell_size
+    snake_body.insert(0,list(snake_head))
+    if snake_head == food:
+        flag = 0
+    else:
+        snake_body.pop()
+    if flag == 0:
+        x = random.randrange(1,40)
+        y = random.randrange(1,30)
+        food = [int(x*cell_size),int(y*cell_size)]
+        flag = 1
+
+    screen.fill((0,0,0))
+    pygame.time.delay(80)
+
+            
+    draw_snake(snake_body)  #绘制贪吃蛇
+    for i in range(0,800,20):      #绘制网格
+        pygame.draw.line(screen,(40,40,40),(i,0),(i,600))
+    pygame.display.update()#刷新界面
+    for i in range(0,600,20):      #绘制网格
+        pygame.draw.line(screen,(40,40,40),(0,i),(800,i))
+    pygame.draw.rect(screen,(255,0,0),(food[0],food[1],cell_size,cell_size))
+    if snake_head[0] > 800 or snake_head[0] < 0:
+        pygame.quit()
+        sys.exit()
+    if snake_head[1] > 600 or snake_head[1] < 0:
+        pygame.quit()
+        sys.exit()
+    for i in snake_body[1:]:
+        if snake_head == i:
+            pygame.quit()
+            sys.exit()  
+    pygame.display.update()#刷新界面
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