python 贪吃蛇小游戏代码

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#!/usr/bin/python import random import pygame import sys from pygame.locals import * Snakespeed = 17 Window_Width = 800 Window_Height = 500 Cell_Size = 20 # Width and height of the cells # Ensuring that the cells fit perfectly in the window. eg if cell size was # 10 and 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 Width Cell_H = int(Window_Height / Cell_Size) # Cellc Height White = (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 color UP = 'up' DOWN = 'down' # Defining keyboard keys. LEFT = 'left' RIGHT = 'right' HEAD = 0 # Syntactic sugar: index of the snake's head def main(): global SnakespeedCLOCK, DISPLAYSURF, BASICFONT pygame.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 loop for event in pygame.event.get(): # event handling loop if event.type == QUIT: terminate() elif event.type == KEYDOWN: if (event.key == K_LEFT) and direction != RIGHT: direction = LEFT elif (event.key == K_RIGHT) and direction != LEFT: direction = RIGHT elif (event.key == K_UP) and direction != DOWN: direction = UP elif (event.key == K_DOWN) and direction != UP: direction = DOWN elif event.key == K_ESCAPE: terminate() # check if the Snake has hit itself or the edge if wormCoords[HEAD]['x'] == -1 or wormCoords[HEAD]['x'] == Cell_W or wormCoords[HEAD]['y'] == -1 or wormCoords[HEAD]['y'] == Cell_H: 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 Snake has eaten an apply if wormCoords[HEAD]['x'] == apple['x'] and wormCoords[HEAD]['y'] == apple['y']: # don't remove worm's tail segment apple = getRandomLocation() # set a new apple somewhere else: del wormCoords[-1] # remove worm's tail segment # move the worm by adding a segment in the direction it is moving if 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 None if keyUpEvents[0].key == K_ESCAPE: terminate() return keyUpEvents[0].key def showStartScreen(): titleFont = pygame.font.Font('freesansbold.ttf', 100) titleSurf1 = titleFont.render('Snake!', True, White, DARKGreen) degrees1 = 0 degrees2 = 0 while 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 queue return pygame.display.update() SnakespeedCLOCK.tick(Snakespeed) degrees1 += 3 # rotate by 3 degrees each frame degrees2 += 7 # rotate by 7 degrees each frame def 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 queue while True: if checkForKeyPress(): pygame.event.get() # clear event queue return def 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_Size y = coord['y'] * Cell_Size wormSegmentRect = 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_Size y = coord['y'] * Cell_Size appleRect = 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 lines pygame.draw.line(DISPLAYSURF, DARKGRAY, (x, 0), (x, Window_Height)) for y in range(0, Window_Height, Cell_Size): # draw horizontal lines pygame.draw.line(DISPLAYSURF, DARKGRAY, (0, y), (Window_Width, y)) if __name__ == '__main__': try: main() except SystemExit: pass

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