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snake.py

@@ -14,26 +14,53 @@ background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
+left = pygame.image.load('left.png')     # 朝左
+up = pygame.image.load('up.png')         # 朝上
+down = pygame.image.load('down.png')     # 朝下
 
-x, y = 240, 120  # 初始化贪吃蛇的头的坐标 
+x, y = 240, 120    # 初始化贪吃蛇的头的坐标 
 position = [(180, 90), (180, 120), (210, 120), (x, y)]   #列表，身体及头的坐标
 
+setheading = "right"
+snake_head = right
+
 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()
-    x += 30
+        if event.type == locals.KEYDOWN:
+            if event.key == locals.K_RIGHT and setheading != "left":
+                setheading = 'right'
+                snake_head = right  #
+            if event.key == locals.K_RIGHT and setheading != "right":
+                setheading = 'left'
+                snake_head = left   #
+            if event.key == locals.K_RIGHT and setheading != "down":
+                setheading = 'up'
+                snake_head = up     #
+            if event.key == locals.K_RIGHT and setheading != "up":
+                setheading = 'down'
+                snake_head = down   #
+
+    # 设置贪吃蛇的头部坐标
+    if setheading == "right"：
+        x += 30
+    elif setheading == "left"：
+        x -= 30
+    elif setheading == "up":
+        y -= 30
+    else:
+        y += 30
     position.append((x, y))  #将贪吃蛇头的新坐标添加进列表
-    position.pop(0)          #
-    
+    position.pop(0)          #    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇头画上去
-    screen.blit(right, position[-1])      #渲染贪吃蛇头，取出列表身体的坐标，进行渲染
+    screen.blit(snake_head, position[-1])  #     #渲染贪吃蛇头，取出列表身体的坐标，进行渲染
     # 将贪吃蛇的身体画上去
-    for i in range(len(position)-1):      #
-        screen.blit(body, position[i])    #
+    for i in range(len(position)-1):      #len函数获取列表的长度再减一
+        screen.blit(body, position[i])    #生成列表下标
 
     # 将果实画上去
     screen.blit(food, (360, 300))