auto save

snake.py

 import pygame
-from pygame import locals
-# 初始化pygame，为使用pygame做准备
+from pygame import locals  
+import random
 pygame.init()
 FPS=pygame.time.Clock()
 background= pygame.image.load('bg.png')
 body = pygame.image.load('body.png')
 food = pygame.image.load('apple.png')
 right = pygame.image.load('right.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
 screen=pygame.display.set_mode((800,600))
 x,y=240,120
 position = [(180,90),(180,120),(210,120),(x,y)]
+setheading="right"
+set_heading=right
+apple_x=300
+apple_y=360
+
+
 while True:
     for event in pygame.event.get():
         if event.type==locals.QUIT:
             exit()
-    x+=30
+        if event.type==locals.KEYDOWN:
+            if event.key==locals.K_UP and setheading !="down":
+                setheading="up"
+                set_heading=up
+            if event.key==locals.K_DOWN and setheading !="up":
+                setheading="down"
+                set_heading=down
+            if event.key==locals.K_LEFT and setheading !="right":
+                setheading="left"
+                set_heading=left
+            if event.key==locals.K_RIGHT and setheading !="left":
+                setheading="right"
+                set_heading=right
+    if setheading=="right":
+        x+=30
+    if setheading=="left":
+        x-=30
+    if setheading=="up":
+        y-=30
+    if setheading=="down":
+        y+=30
+    
     position.append((x,y))
-    position.pop(0)
+    if x==apple_x and y==apple_y:
+        num1=random.randint(1,22)
+        num2=random.randint(1,16)
+        apple_x = num1*30-30
+        apple_y = num2*30-30
+    else:
+        position.pop(0)
+    if x < 0 or x > 630 or y < 0 or y > 450:
+        exit()
     screen.blit(background,(0,0))
-    screen.blit(right,position[-1])
+    screen.blit(set_heading,position[-1])
     for i in range(len(position)-1):
          screen.blit(body,position[i])
-    screen.blit(food,(360,300))
+    screen.blit(food,(apple_x,apple_y))
 
     pygame.display.update()
-    FPS.tick(2)
\ No newline at end of file
+    FPS.tick(2)
+
+
+
+