Python 贪吃蛇源码

“”“贪吃蛇”""
import random
import sys
import time
import pygame
from pygame.locals import *
from collections import deque

SCREEN_WIDTH = 600 # 屏幕宽度
SCREEN_HEIGHT = 480 # 屏幕高度
SIZE = 20 # 小方格大小
LINE_WIDTH = 1 # 网格线宽度

#游戏区域的坐标范围
SCOPE_X = (0, SCREEN_WIDTH // SIZE - 1)
SCOPE_Y = (2, SCREEN_HEIGHT // SIZE - 1)

#食物的分值及颜色
FOOD_STYLE_LIST = [(10, (255, 100, 100)), (20, (100, 255, 100)), (30, (100, 100, 255))]

LIGHT = (100, 100, 100)
DARK = (200, 200, 200) # 蛇的颜色
BLACK = (0, 0, 0) # 网格线颜色
RED = (200, 30, 30) # 红色,GAME OVER 的字体颜色
BGCOLOR = (40, 40, 60) # 背景色

def print_text(screen, font, x, y, text, fcolor=(255, 255, 255)):
imgText = font.render(text, True, fcolor)
screen.blit(imgText, (x, y))

#初始化蛇
def init_snake():
snake = deque()
snake.append((2, SCOPE_Y[0]))
snake.append((1, SCOPE_Y[0]))
snake.append((0, SCOPE_Y[0]))
return snake

def create_food(snake):
food_x = random.randint(SCOPE_X[0], SCOPE_X[1])
food_y = random.randint(SCOPE_Y[0], SCOPE_Y[1])
while (food_x, food_y) in snake:
# 如果食物出现在蛇身上,则重来
food_x = random.randint(SCOPE_X[0], SCOPE_X[1])
food_y = random.randint(SCOPE_Y[0], SCOPE_Y[1])
return food_x, food_y

def get_food_style():
return FOOD_STYLE_LIST[random.randint(0, 2)]

def main():
pygame.init()
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption(‘贪吃蛇’)

font1 = pygame.font.SysFont('SimHei', 24)  # 得分的字体
font2 = pygame.font.Font(None, 72)  # GAME OVER 的字体
fwidth, fheight = font2.size('GAME OVER')

# 如果蛇正在向右移动,那么快速点击向下向左,由于程序刷新没那么快,向下事件会被向左覆盖掉,导致蛇后退,直接GAME OVER
# b 变量就是用于防止这种情况的发生
b = True

# 蛇
snake = init_snake()
# 食物
food = create_food(snake)
food_style = get_food_style()
# 方向
pos = (1, 0)

game_over = True
start = False       # 是否开始,当start = True,game_over = True 时,才显示 GAME OVER
score = 0           # 得分
orispeed = 0.5      # 原始速度
speed = orispeed
last_move_time = None
pause = False       # 暂停

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            sys.exit()
        elif event.type == KEYDOWN:
            if event.key == K_RETURN:
                if game_over:
                    start = True
                    game_over = False
                    b = True
                    snake = init_snake()
                    food = create_food(snake)
                    food_style = get_food_style()
                    pos = (1, 0)
                    # 得分
                    score = 0
                    last_move_time = time.time()
            elif event.key == K_SPACE:
                if not game_over:
                    pause = not pause
            elif event.key in (K_w, K_UP):
                # 这个判断是为了防止蛇向上移时按了向下键,导致直接 GAME OVER
                if b and not pos[1]:
                    pos = (0, -1)
                    b = False
            elif event.key in (K_s, K_DOWN):
                if b and not pos[1]:
                    pos = (0, 1)
                    b = False
            elif event.key in (K_a, K_LEFT):
                if b and not pos[0]:
                    pos = (-1, 0)
                    b = False
            elif event.key in (K_d, K_RIGHT):
                if b and not pos[0]:
                    pos = (1, 0)
                    b = False

    # 填充背景色
    screen.fill(BGCOLOR)
    # 画网格线 竖线
    for x in range(SIZE, SCREEN_WIDTH, SIZE):
        pygame.draw.line(screen, BLACK, (x, SCOPE_Y[0] * SIZE), (x, SCREEN_HEIGHT), LINE_WIDTH)
    # 画网格线 横线
    for y in range(SCOPE_Y[0] * SIZE, SCREEN_HEIGHT, SIZE):
        pygame.draw.line(screen, BLACK, (0, y), (SCREEN_WIDTH, y), LINE_WIDTH)

    if not game_over:
        curTime = time.time()
        if curTime - last_move_time > speed:
            if not pause:
                b = True
                last_move_time = curTime
                next_s = (snake[0][0] + pos[0], snake[0][1] + pos[1])
                if next_s == food:
                    # 吃到了食物
                    snake.appendleft(next_s)
                    score += food_style[0]
                    speed = orispeed - 0.03 * (score // 100)
                    food = create_food(snake)
                    food_style = get_food_style()
                else:
                    if SCOPE_X[0] <= next_s[0] <= SCOPE_X[1] and SCOPE_Y[0] <= next_s[1] <= SCOPE_Y[1] \
                            and next_s not in snake:
                        snake.appendleft(next_s)
                        snake.pop()
                    else:
                        game_over = True

    # 画食物
    if not game_over:
        # 避免 GAME OVER 的时候把 GAME OVER 的字给遮住了
        pygame.draw.rect(screen, food_style[1], (food[0] * SIZE, food[1] * SIZE, SIZE, SIZE), 0)

    # 画蛇
    for s in snake:
        pygame.draw.rect(screen, DARK, (s[0] * SIZE + LINE_WIDTH, s[1] * SIZE + LINE_WIDTH,
                                        SIZE - LINE_WIDTH * 2, SIZE - LINE_WIDTH * 2), 0)

    print_text(screen, font1, 30, 7, f'速度: {score//100}')
    print_text(screen, font1, 450, 7, f'得分: {score}')

    if game_over:
        if start:
            print_text(screen, font2, (SCREEN_WIDTH - fwidth) // 2, (SCREEN_HEIGHT - fheight) // 2, 'GAME OVER', RED)

    pygame.display.update()

if name == ‘main’:
main()

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