#!/usr/bin/python# -*- coding: UTF-8 -*-#作者：黄哥#链接：/question/55873159/answer/146647646#来源：知乎#著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。import randomimport pygameimport sysfrom pygame.locals import *Snakespeed = 17Window_Width = 800Window_Height = 500Cell_Size = 20 # Width and height of the cells# Ensuring that the cells fit perfectly in the window. eg if cell size was# 10and window width or windowheight were 15 only 1.5 cells would# fit.assert Window_Width % Cell_Size == 0, "Window width must be a multiple of cell size."# Ensuring that only whole integer number of cells fit perfectly in the window.assert Window_Height % Cell_Size == 0, "Window height must be a multiple of cell size."Cell_W = int(Window_Width / Cell_Size) # Cell WidthCell_H = int(Window_Height / Cell_Size) # Cellc HeightWhite = (255, 255, 255)Black = (0, 0, 0)Red = (255, 0, 0) # Defining element colors for the program.Green = (0, 255, 0)DARKGreen = (0, 155, 0)DARKGRAY = (40, 40, 40)YELLOW = (255, 255, 0)Red_DARK = (150, 0, 0)BLUE = (0, 0, 255)BLUE_DARK = (0, 0, 150)BGCOLOR = Black # Background colorUP = 'up'DOWN = 'down'# Defining keyboard keys.LEFT = 'left'RIGHT = 'right'HEAD = 0 # Syntactic sugar: index of the snake's headdef main():global SnakespeedCLOCK, DISPLAYSURF, BASICFONTpygame.init()SnakespeedCLOCK = pygame.time.Clock()DISPLAYSURF = pygame.display.set_mode((Window_Width, Window_Height))BASICFONT = pygame.font.Font('freesansbold.ttf', 18)pygame.display.set_caption('Snake')showStartScreen()while True:runGame()showGameOverScreen()def runGame():# Set a random start point.startx = random.randint(5, Cell_W - 6)starty = random.randint(5, Cell_H - 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 loopfor event in pygame.event.get(): # event handling loopif event.type == QUIT:terminate()elif event.type == KEYDOWN:if (event.key == K_LEFT) and direction != RIGHT:direction = LEFTelif (event.key == K_RIGHT) and direction != LEFT:direction = RIGHTelif (event.key == K_UP) and direction != DOWN:direction = UPelif (event.key == K_DOWN) and direction != UP:direction = DOWNelif event.key == K_ESCAPE:terminate()# check if the Snake has hit itself or the edgeif wormCoords[HEAD]['x'] == -1 or wormCoords[HEAD]['x'] == Cell_W or wormCoords[HEAD]['y'] == -1 or wormCoords[HEAD]['y'] == Cell_H:return # game overfor wormBody in wormCoords[1:]:if wormBody['x'] == wormCoords[HEAD]['x'] and wormBody['y'] == wormCoords[HEAD]['y']:return # game over# check if Snake has eaten an applyif wormCoords[HEAD]['x'] == apple['x'] and wormCoords[HEAD]['y'] == apple['y']:# don't remove worm's tail segmentapple = getRandomLocation() # set a new apple somewhereelse:del wormCoords[-1] # remove worm's tail segment# move the worm by adding a segment in the direction it is movingif direction == UP:newHead = {'x': wormCoords[HEAD]['x'],'y': wormCoords[HEAD]['y'] - 1}elif direction == DOWN:newHead = {'x': wormCoords[HEAD]['x'],'y': wormCoords[HEAD]['y'] + 1}elif direction == LEFT:newHead = {'x': wormCoords[HEAD]['x'] - 1, 'y': wormCoords[HEAD]['y']}elif direction == RIGHT:newHead = {'x': wormCoords[HEAD]['x'] + 1, 'y': wormCoords[HEAD]['y']}wormCoords.insert(0, newHead)DISPLAYSURF.fill(BGCOLOR)drawGrid()drawWorm(wormCoords)drawApple(apple)drawScore(len(wormCoords) - 3)pygame.display.update()SnakespeedCLOCK.tick(Snakespeed)def drawPressKeyMsg():pressKeySurf = BASICFONT.render('Press a key to play.', True, White)pressKeyRect = pressKeySurf.get_rect()pressKeyRect.topleft = (Window_Width - 200, Window_Height - 30)DISPLAYSURF.blit(pressKeySurf, pressKeyRect)def checkForKeyPress():if len(pygame.event.get(QUIT)) > 0:terminate()keyUpEvents = pygame.event.get(KEYUP)if len(keyUpEvents) == 0:return Noneif keyUpEvents[0].key == K_ESCAPE:terminate()return keyUpEvents[0].keydef showStartScreen():titleFont = pygame.font.Font('freesansbold.ttf', 100)titleSurf1 = titleFont.render('Snake!', True, White, DARKGreen)degrees1 = 0degrees2 = 0while True:DISPLAYSURF.fill(BGCOLOR)rotatedSurf1 = pygame.transform.rotate(titleSurf1, degrees1)rotatedRect1 = rotatedSurf1.get_rect()rotatedRect1.center = (Window_Width / 2, Window_Height / 2)DISPLAYSURF.blit(rotatedSurf1, rotatedRect1)drawPressKeyMsg()if checkForKeyPress():pygame.event.get() # clear event queuereturnpygame.display.update()SnakespeedCLOCK.tick(Snakespeed)degrees1 += 3 # rotate by 3 degrees each framedegrees2 += 7 # rotate by 7 degrees each framedef terminate():pygame.quit()sys.exit()def getRandomLocation():return {'x': random.randint(0, Cell_W - 1), 'y': random.randint(0, Cell_H - 1)}def showGameOverScreen():gameOverFont = pygame.font.Font('freesansbold.ttf', 100)gameSurf = gameOverFont.render('Game', True, White)overSurf = gameOverFont.render('Over', True, White)gameRect = gameSurf.get_rect()overRect = overSurf.get_rect()gameRect.midtop = (Window_Width / 2, 10)overRect.midtop = (Window_Width / 2, gameRect.height + 10 + 25)DISPLAYSURF.blit(gameSurf, gameRect)DISPLAYSURF.blit(overSurf, overRect)drawPressKeyMsg()pygame.display.update()pygame.time.wait(500)checkForKeyPress() # clear out any key presses in the event queuewhile True:if checkForKeyPress():pygame.event.get() # clear event queuereturndef drawScore(score):scoreSurf = BASICFONT.render('Score: %s' % (score), True, White)scoreRect = scoreSurf.get_rect()scoreRect.topleft = (Window_Width - 120, 10)DISPLAYSURF.blit(scoreSurf, scoreRect)def drawWorm(wormCoords):for coord in wormCoords:x = coord['x'] * Cell_Sizey = coord['y'] * Cell_SizewormSegmentRect = pygame.Rect(x, y, Cell_Size, Cell_Size)pygame.draw.rect(DISPLAYSURF, DARKGreen, wormSegmentRect)wormInnerSegmentRect = pygame.Rect(x + 4, y + 4, Cell_Size - 8, Cell_Size - 8)pygame.draw.rect(DISPLAYSURF, Green, wormInnerSegmentRect)def drawApple(coord):x = coord['x'] * Cell_Sizey = coord['y'] * Cell_SizeappleRect = pygame.Rect(x, y, Cell_Size, Cell_Size)pygame.draw.rect(DISPLAYSURF, Red, appleRect)def drawGrid():for x in range(0, Window_Width, Cell_Size): # draw vertical linespygame.draw.line(DISPLAYSURF, DARKGRAY, (x, 0), (x, Window_Height))for y in range(0, Window_Height, Cell_Size): # draw horizontal linespygame.draw.line(DISPLAYSURF, DARKGRAY, (0, y), (Window_Width, y))if __name__ == '__main__':try:main()except SystemExit:pass
start
game over
