Python贪吃蛇游戏源代码源程序
程序运行截图：
import pygame as pg
from random import randint
import sys
from pygame.locals import *
FPS = 6 # 画面帧数，代表蛇的移动速率
window_width = 600
window_height = 500
cellsize = 20
cell_width = int(window_width / cellsize)
cell_height = int(window_height / cellsize)
BGcolor = (0, 0, 0)
BLUE = (0, 0, 255)
RED = (255, 0, 0)
apple_color = (255, 0, 0)
snake_color = (0, 150, 0)
GREEN = (0, 255, 0)
WHITE = (255, 255, 255)
DARKGRAY = (40, 40, 40)
UP = "up"
DOWN = "down"
LEFT = "left"
RIGHT = "right"
HEAD = 0
def main(): # 有函数
global FPSclock, window, BASICFONT
pg.init()
FPSclock = pg.time.Clock()
window = pg.display.set_mode((window_width, window_height))
BASICFONT = pg.font.Font("freesansbold.ttf", 18)
pg.display.set_caption("贪吃蛇")
showStartScreen()
while True:
runGame()
showGameOverScreen()
def runGame(): # 运行游戏函数
startx = randint(5, cell_width - 6)
starty = randint(5, cell_height - 6)
snakeCoords = [{"x": startx, "y": starty}, {"x": startx - 1, "y": starty}, {"x": startx - 2, "y": starty}]
direction = RIGHT
apple = getRandomLocation()
while True:
for event in pg.event.get():
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()
if snakeCoords[HEAD]["x"] == -1 or snakeCoords[HEAD]["x"] == cell_width or snakeCoords[HEAD]["y"] == -1 or \
snakeCoords[HEAD]["y"] == cell_height:
return
for snakeBody in snakeCoords[1:]:
if snakeBody["x"] == snakeCoords[HEAD]["x"] and snakeBody["y"] == snakeCoords[HEAD]["y"]:
return
if snakeCoords[HEAD]["x"] == apple["x"] and snakeCoords[HEAD]["y"] == apple["y"]:
apple = getRandomLocation()
else:
del snakeCoords[-1]
if direction == UP:
newHead = {"x": snakeCoords[HEAD]["x"], "y": snakeCoords[HEAD]["y"] - 1}
elif direction == DOWN:
newHead = {"x": snakeCoords[HEAD]["x"], "y": snakeCoords[HEAD]["y"] + 1}
elif direction == LEFT:
newHead = {"x": snakeCoords[HEAD]["x"] - 1, "y": snakeCoords[HEAD]["y"]}
elif direction == RIGHT:
newHead = {"x": snakeCoords[HEAD]["x"] + 1, "y": snakeCoords[HEAD]["y"]}
snakeCoords.insert(0, newHead)
window.fill(BGcolor)
drawGrid()
drawSnake(snakeCoords)
drawApple(apple)
drawScore(len(snakeCoords) - 3)
pg.display.update()
FPSclock.tick(FPS)
def drawPressKeyMsg(): # 游戏开始提示信息
pressKeySurf = BASICFONT.render("press a key to play", True, BLUE)
pressKeyRect = pressKeySurf.get_rect()
pressKeyRect.topleft = (window_width - 200, window_height - 30)
window.blit(pressKeySurf, pressKeyRect)
def checkForKeyPress(): # 检查是否触发按键
if len(pg.event.get(QUIT)) > 0:
terminate()
keyUpEvents = pg.event.get(KEYUP)
if len(keyUpEvents) == 0:
return None
if keyUpEvents[0].key == K_ESCAPE:
terminate()
return keyUpEvents[0].key
def showStartScreen(): # 开始画面
window.fill(BGcolor)
titleFont = pg.font.Font("freesansbold.ttf", 100)
titleSurf = titleFont.render("snake!", True, RED)
titleRect = titleSurf.get_rect()
titleRect.center = (window_width / 2, window_height / 2)
window.blit(titleSurf, titleRect)
drawPressKeyMsg()
pg.display.update()
while True:
if checkForKeyPress():
pg.event.get()
return
def terminate(): # 退出
pg.quit()
sys.exit()
def getRandomLocation(): # 出现位置
return {"x": randint(0, cell_width - 1), "y": randint(0, cell_height - 1)}
def showGameOverScreen(): # 游戏结束
gameOverFont = pg.font.Font("freesansbold.tff", 150)
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.height10 + 25)
window.blit(gameSurf, gameRect)
window.blit(overSurf, overRect)
drawPressKeyMsg()
pg.display.update()
pg.time.wait(500)
checkForKeyPress()
while True:
if checkForKeyPress():
pg.event.get()
return
def drawScore(score): # 显示分数
scoreSurf = BASICFONT.render("Score:%s" % (score), True, WHITE)
scoreRect = scoreSurf.get_rect()
scoreRect.topleft = (window_width - 120, 10)
window.blit(scoreSurf, scoreRect)
def drawSnake(snakeCoords): # 画蛇
for coord in snakeCoords:
x = coord["x"] * cellsize
y = coord["y"] * cellsize
snakeSegmentRect = pg.Rect(x, y, cellsize, cellsize)
pg.draw.rect(window, snake_color, snakeSegmentRect)
snakeInnerSegmentRect = pg.Rect(x + 4, y + 4, cellsize - 8, cellsize - 8)
pg.draw.rect(window, GREEN, snakeInnerSegmentRect)
def drawApple(coord):
x = coord["x"] * cellsize
y = coord["y"] * cellsize
appleRect = pg.Rect(x, y, cellsize, cellsize)
pg.draw.rect(window, apple_color, appleRect)
def drawGrid(): # 画方格
for x in range(0, window_width, cellsize):
pg.draw.line(window, DARKGRAY, (x, 0), (x, window_height))
for y in range(0, window_height, cellsize):
pg.draw.line(window, DARKGRAY, (0, y), (window_width, y))
if __name__ == "__main__":
main()
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