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snake.py

@@ -15,22 +15,46 @@ food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 x = 240
 y = 120
+pos = [(180,90),(180,120),(210,120),(x,y)]
+head = "right"
+snakehead = 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()
+        if event.type == locals.KEYDOWN:
+            if event.key == locals.K_LEFT and head !="left":
+                head = 'right'
+                snakehead = right
+            if event.key == locals.K_LEFT and head !="right":
+                head = 'left'
+                snakehead = left
+            if event.key == locals.K_LEFT and head !="down":
+                head = 'up'
+                snakehead = up
+            if event.key == locals.K_LEFT and head !="up":
+                head = 'down'
+                snakehead = down
+            
+            
+    if head == "right":        
         x+=30
+    elif head =="left":
+        x-=30
+    elif head == "up":
+        y-=30
+    elif head =="down":
+        y+=30
+    pos.append((x,y))
+    pos.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    screen.blit(right, (x, y))
-    # 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(right, pos[-1])
+    for i in range(len(pos)-1):
+        screen.blit(body,pos[i])
     screen.blit(food, (360, 300))
     # 刷新画面
     pygame.display.update()