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import random
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import sys
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import time
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import pygame
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from pygame.locals import *
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from collections import deque
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SCREEN_WIDTH = 600
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SCREEN_HEIGHT = 480
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SIZE = 20
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def print_text(screen, font, x, y, text, fcolor=(255, 255, 255)):
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imgText = font.render(text, True, fcolor)
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screen.blit(imgText, (x, y))
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def main():
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pygame.init()
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screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
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pygame.display.set_caption('贪吃蛇')
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light = (100, 100, 100) # 蛇的颜色
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dark = (200, 200, 200) # 食物颜色
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font1 = pygame.font.SysFont('SimHei', 24) # 得分的字体
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font2 = pygame.font.Font(None, 72) # GAME OVER 的字体
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red = (200, 30, 30) # GAME OVER 的字体颜色
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fwidth, fheight = font2.size('GAME OVER')
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line_width = 1 # 网格线宽度
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black = (0, 0, 0) # 网格线颜色
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bgcolor = (40, 40, 60) # 背景色
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# 方向，起始向右
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pos_x = 1
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pos_y = 0
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# 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
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# b 变量就是用于防止这种情况的发生
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b = True
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# 范围
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scope_x = (0, SCREEN_WIDTH // SIZE - 1)
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scope_y = (2, SCREEN_HEIGHT // SIZE - 1)
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# 蛇
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snake = deque()
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# 食物
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food_x = 0
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food_y = 0
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# 初始化蛇
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def _init_snake():
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nonlocal snake
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snake.clear()
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snake.append((2, scope_y[0]))
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snake.append((1, scope_y[0]))
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snake.append((0, scope_y[0]))
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# 食物
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def _create_food():
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nonlocal food_x, food_y
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food_x = random.randint(scope_x[0], scope_x[1])
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food_y = random.randint(scope_y[0], scope_y[1])
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while (food_x, food_y) in snake:
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# 为了防止食物出到蛇身上
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food_x = random.randint(scope_x[0], scope_x[1])
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food_y = random.randint(scope_y[0], scope_y[1])
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_init_snake()
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_create_food()
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game_over = True
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start = False # 是否开始，当start = True，game_over = True 时，才显示 GAME OVER
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score = 0 # 得分
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orispeed = 0.5 # 原始速度
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speed = orispeed
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last_move_time = None
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pause = False # 暂停
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while True:
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for event in pygame.event.get():
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if event.type == QUIT:
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sys.exit()
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elif event.type == KEYDOWN:
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if event.key == K_RETURN:
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if game_over:
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start = True
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game_over = False
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b = True
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_init_snake()
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_create_food()
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pos_x = 1
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pos_y = 0
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# 得分
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score = 0
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last_move_time = time.time()
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elif event.key == K_SPACE:
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if not game_over:
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pause = not pause
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elif event.key in (K_w, K_UP):
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# 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
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if b and not pos_y:
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pos_x = 0
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pos_y = -1
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b = False
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elif event.key in (K_s, K_DOWN):
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if b and not pos_y:
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pos_x = 0
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pos_y = 1
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b = False
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elif event.key in (K_a, K_LEFT):
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if b and not pos_x:
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pos_x = -1
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pos_y = 0
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b = False
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elif event.key in (K_d, K_RIGHT):
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if b and not pos_x:
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pos_x = 1
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pos_y = 0
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b = False
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# 填充背景色
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screen.fill(bgcolor)
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# 画网格线 竖线
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for x in range(SIZE, SCREEN_WIDTH, SIZE):
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pygame.draw.line(screen, black, (x, scope_y[0] * SIZE), (x, SCREEN_HEIGHT), line_width)
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# 画网格线 横线
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for y in range(scope_y[0] * SIZE, SCREEN_HEIGHT, SIZE):
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pygame.draw.line(screen, black, (0, y), (SCREEN_WIDTH, y), line_width)
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if game_over:
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if start:
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print_text(screen, font2, (SCREEN_WIDTH - fwidth) // 2, (SCREEN_HEIGHT - fheight) // 2, 'GAME OVER',
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red)
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else:
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curTime = time.time()
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if curTime - last_move_time > speed:
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if not pause:
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b = True
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last_move_time = curTime
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next_s = (snake[0][0] + pos_x, snake[0][1] + pos_y)
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if next_s[0] == food_x and next_s[1] == food_y:
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# 吃到了食物
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_create_food()
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snake.appendleft(next_s)
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score += 10
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speed = orispeed - 0.03 * (score // 100)
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else:
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if scope_x[0] <= next_s[0] <= scope_x[1] and scope_y[0] <= next_s[1] <= scope_y[1] \
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and next_s not in snake:
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snake.appendleft(next_s)
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snake.pop()
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else:
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game_over = True
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# 画食物
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if not game_over:
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# 避免 GAME OVER 的时候把 GAME OVER 的字给遮住了
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pygame.draw.rect(screen, light, (food_x * SIZE, food_y * SIZE, SIZE, SIZE), 0)
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# 画蛇
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for s in snake:
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pygame.draw.rect(screen, dark, (s[0] * SIZE + line_width, s[1] * SIZE + line_width,
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SIZE - line_width * 2, SIZE - line_width * 2), 0)
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print_text(screen, font1, 30, 7, f'速度: {score // 100}')
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print_text(screen, font1, 450, 7, f'得分: {score}')
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pygame.display.update()
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if __name__ == '__main__':
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main()
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