import pygame,sys,random,time
from pygame.locals import * #從pygame模塊導(dǎo)入常用的函數(shù)和常量
#定義顏色變量
black_colour = pygame.Color(0,0,0)
white_colour = pygame.Color(255,255,255)
red_colour = pygame.Color(255,0,0)
grey_colour = pygame.Color(150,150,150)
#定義游戲結(jié)束函數(shù)
def GameOver(gamesurface):
 #設(shè)置提示字體的格式
 GameOver_font = pygame.font.SysFont("MicrosoftYaHei", 16)
 #設(shè)置提示字體的顏色
 GameOver_colour = GameOver_font.render('Game Over',True,grey_colour)
 #設(shè)置提示位置
 GameOver_location = GameOver_colour.get_rect()
 GameOver_location.midtop = (320,10)
 #綁定以上設(shè)置到句柄
 gamesurface.blit(GameOver_colour,GameOver_location)
 #提示運(yùn)行信息
 pygame.display.flip()
 #休眠5秒
 time.sleep(5)
 #退出游戲
 pygame.quit()
 #退出程序
 sys.exit()
#定義主函數(shù)
def main():
 #初始化pygame，為使用硬件做準(zhǔn)備
 pygame.init()
 pygame.time.Clock()
 ftpsClock = pygame.time.Clock()
 #創(chuàng)建一個窗口
 gamesurface = pygame.display.set_mode((640,480))
 #設(shè)置窗口的標(biāo)題
 pygame.display.set_caption('tanchishe snake')
 #初始化變量
 #初始化貪吃蛇的起始位置
 snakeposition = [100,100]
 #初始化貪吃蛇的長度
 snakelength = [[100,100],[80,100],[60,100]]
 #初始化目標(biāo)方塊的位置
 square_purpose = [300,300]
 #初始化一個數(shù)來判斷目標(biāo)方塊是否存在
 square_position = 1
 #初始化方向，用來使貪吃蛇移動
 derection = "right"
 change_derection = derection
 #進(jìn)行游戲主循環(huán)
 while True:
  #檢測按鍵等pygame事件
  for event in pygame.event.get():
   if event.type==QUIT:
    #接收到退出事件后，退出程序
    pygame.quit()
    sys.exit()
   elif event.type==KEYDOWN:
    #判斷鍵盤事件,用w,s,a,d來表示上下左右
    if event.key==K_RIGHT or event.key==ord('d'):
     change_derection = "right"
    if event.key==K_LEFT or event.key==ord('a'):
     change_derection = "left"
    if event.key==K_UP or event.key==ord('w'):
     change_derection = "up"
    if event.key==K_DOWN or event.key==ord('s'):
     change_derection = "down"
    if event.key==K_ESCAPE:
     pygame.event.post(pygame.event.Event(QUIT))
  #判斷移動的方向是否相反
  if change_derection =='left'and not derection =='right':
   derection = change_derection
  if change_derection =='right'and not derection =='left':
   derection = change_derection
  if change_derection == 'up' and not derection =='down':
   derection = change_derection
  if change_derection == 'down' and not derection == 'up':
   derection = change_derection
  #根據(jù)方向，改變坐標(biāo)
  if derection == 'left':
   snakeposition[0] -= 20
  if derection == 'right':
   snakeposition[0] += 20
  if derection == 'up':
   snakeposition[1] -= 20
  if derection == 'down':
   snakeposition[1] += 20
  #增加蛇的長度
  snakelength.insert(0,list(snakeposition))
  #判斷是否吃掉目標(biāo)方塊
  if snakeposition[0]==square_purpose[0] and snakeposition[1]==square_purpose[1]:
   square_position = 0
  else:
   snakelength.pop()
  #重新生成目標(biāo)方塊
  if square_position ==0:
   #隨機(jī)生成x,y,擴(kuò)大二十倍，在窗口范圍內(nèi)
   x = random.randrange(1,32)
   y = random.randrange(1,24)
   square_purpose = [int(x*20),int(y*20)]
   square_position = 1
  #繪制pygame顯示層
  gamesurface.fill(black_colour)
  for position in snakelength:
   pygame.draw.rect(gamesurface,white_colour,Rect(position[0],position[1],20,20))
   pygame.draw.rect(gamesurface,red_colour,Rect(square_purpose[0],square_purpose[1],20,20))
  #刷新pygame顯示層
  pygame.display.flip()
  #判斷是否死亡
  if snakeposition[0]<0 or snakeposition[0]>620:
   GameOver(gamesurface)
  if snakeposition[1]<0 or snakeposition[1]>460:
   GameOver(gamesurface)
  for snakebody in snakelength[1:]:
   if snakeposition[0]==snakebody[0] and snakeposition[1]==snakebody[1]:
    GameOver(gamesurface)
  #控制游戲速度
  ftpsClock.tick(5)
 
if __name__ == "__main__":
 main()