#?Wormy?（a?Nibbles?clone）
#?By?Al?Sweigart?al@inventwithpython.com
#?http://inventwithpython.com/pygame
#?Released?under?a?“Simplified?BSD“?license

import?random?pygame?sys
from?pygame.locals?import?*

FPS?=?12
WINDOWWIDTH?=?640
WINDOWHEIGHT?=?480
CELLSIZE?=?20
assert?WINDOWWIDTH?%?CELLSIZE?==?0?“Window?width?must?be?a?multiple?of?cell?size.“
assert?WINDOWHEIGHT?%?CELLSIZE?==?0?“Window?height?must?be?a?multiple?of?cell?size.“
CELLWIDTH?=?int（WINDOWWIDTH?/?CELLSIZE）
CELLHEIGHT?=?int（WINDOWHEIGHT?/?CELLSIZE）

#?????????????R????G????B
WHITE?????=?（255?255?255）
BLACK?????=?（??0???0???0）
RED???????=?（255???0???0）
GREEN?????=?（??0?255???0）
DARKGREEN?=?（??0?155???0）
DARKGRAY??=?（?40??40??40）
BGCOLOR?=?BLACK

UP?=?‘up‘
DOWN?=?‘down‘
LEFT?=?‘left‘
RIGHT?=?‘right‘

HEAD?=?0?#?syntactic?sugar:?index?of?the?worm‘s?head

def?main（）:
????global?FPSCLOCK?DISPLAYSURF?BASICFONT

????pygame.init（）
????FPSCLOCK?=?pygame.time.Clock（）
????DISPLAYSURF?=?pygame.display.set_mode（（WINDOWWIDTH?WINDOWHEIGHT））
????BASICFONT?=?pygame.font.Font（‘freesansbold.ttf‘?18）
????pygame.display.set_caption（‘Wormy‘）

????showStartScreen（）
????while?True:
????????runGame（）
????????showGameOverScreen（）


def?runGame（）:
????#?Set?a?random?start?point.
????startx?=?random.randint（5?CELLWIDTH?-?6）
????starty?=?random.randint（5?CELLHEIGHT?-?6）
????wormCoords?=?[{‘x‘:?startx?????‘y‘:?starty}
??????????????????{‘x‘:?startx?-?1?‘y‘:?starty}
??????????????????{‘x‘:?startx?-?2?‘y‘:?starty}]
????direction?=?RIGHT

????#?Start?the?apple?in?a?random?place.
????apple?=?getRandomLocation（）

????while?True:?#?main?game?loop
????????for?event?in?pygame.event.get（）:?#?event?handling?loop
????????????if?event.type?==?QUIT:
????????????????terminate（）
????????????elif?event.type?==?KEYDOWN:
????????????????if?（event.key?==?K_LEFT?or?event.key?==?K_a）?and?direction?!=?RIGHT:
????????????????????direction?=?LEFT
????????????????elif?（event.key?==?K_RIGHT?or?event.key?==?K_d）?and?direction?!=?LEFT:
????????????????????direction?=?RIGHT
????????????????elif?（event.key?==?K_UP?or?event.key?==?K_w）?and?direction?!=?DOWN:
????????????????????direction?=?UP
????????????????elif?（event.key?==?K_DOWN?or?event.key?==?K_s）?and?direction?!=?UP:
????????????????????direction?=?DOWN
????????????????elif?event.key?==?K_ESCAPE:
????????????????????terminate（）

????????#?check?if?the?worm?has?hit?itself?or?the?edge
????????if?wormCoords[HEAD][‘x‘]?==?-1?or?wormCoords[HEAD][‘x‘]?==?CELLWIDTH?or?wormCoords[HEAD][‘y‘]?==?-1?or?wormCoords[HEAD][‘y‘]?==?CELLHEIGHT:
????????????return?#?game?over
????????for?wormBody?in?wormCoords[1:]:
????????????if?wormBody[‘x‘]?==?wormCoords[HEAD][‘x‘]?and?wormBody[‘y‘]?==?wormCoords[HEAD][‘y‘]:
????????????????return?#?game?over

????????#?check?if?worm?has?eaten?an?apply
????????if?wormCoords[HEAD][‘x‘]?==?apple[‘x‘]?and?wormCoords[HEAD][‘y‘]?==?apple[‘y‘]:
????????????#?don‘t?re