save project

snake.py

 import pygame
 from pygame import locals
-import random
+import random#导入
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 
@@ -20,8 +20,8 @@ down = pygame.image.load('down.png')        # 头 朝下
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
 
-apple_x = 360
-apple_y = 300
+apple_x = 360#设置苹果x坐标
+apple_y = 300#设置苹果y坐标
 setheading = "right"
 snake_head = right
 
@@ -30,7 +30,7 @@ while True:
         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.type == locals.KEYDOWN:#接受键盘按下事件
             if event.key == locals.K_RIGHT and setheading != "left":
                 setheading = 'right'
                 snake_head = right
@@ -53,11 +53,15 @@ while True:
         y -= 30
     else:
         y += 30
-    if x == apple_x and y ==apple_y:
-        apple_x = random.randint(0,660)
-        apple_y = random.randint(0,480)    
+    if x == apple_x and y ==apple_y:#如果吃到
+        sum1 = random.randint(1,22)#随机生成新的坐标，在吃到后
+        sum2 = random.randint(1,16)
+        apple_x = sum1*30-30
+        apple_y = sum2*30-30
+    else:    
+        position.pop(0)     
     position.append((x, y))
-    position.pop(0)
+    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -67,7 +71,7 @@ while True:
         screen.blit(body, position[i])
 
     # 将果实画上去
-    screen.blit(food, (apple_x, apple_y))
+    screen.blit(food, (apple_x, apple_y))#新的坐标
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(10)
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+    FPSCLOCK.tick(10)#设置帧数，越高越快
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