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Gluttonous Snake code.txt

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+import random
+import sys
+import time
+import pygame
+from pygame.locals import *
+from collections import deque
+
+SCREEN_WIDTH = 600
+SCREEN_HEIGHT = 480
+SIZE = 20
+
+
+def print_text(screen, font, x, y, text, fcolor=(255, 255, 255)):
+    imgText = font.render(text, True, fcolor)
+    screen.blit(imgText, (x, y))
+
+
+def main():
+    pygame.init()
+    screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
+    pygame.display.set_caption('贪吃蛇')
+
+    light = (100, 100, 100)  # 蛇的颜色
+    dark = (200, 200, 200)  # 食物颜色
+
+    font1 = pygame.font.SysFont('SimHei', 24)  # 得分的字体
+    font2 = pygame.font.Font(None, 72)  # GAME OVER 的字体
+    red = (200, 30, 30)  # GAME OVER 的字体颜色
+    fwidth, fheight = font2.size('GAME OVER')
+    line_width = 1  # 网格线宽度
+    black = (0, 0, 0)  # 网格线颜色
+    bgcolor = (40, 40, 60)  # 背景色
+
+    # 方向，起始向右
+    pos_x = 1
+    pos_y = 0
+    # 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
+    # 范围
+    scope_x = (0, SCREEN_WIDTH // SIZE - 1)
+    scope_y = (2, SCREEN_HEIGHT // SIZE - 1)
+    # 蛇
+    snake = deque()
+    # 食物
+    food_x = 0
+    food_y = 0
+
+    # 初始化蛇
+    def _init_snake():
+        nonlocal snake
+        snake.clear()
+        snake.append((2, scope_y[0]))
+        snake.append((1, scope_y[0]))
+        snake.append((0, scope_y[0]))
+
+    # 食物
+    def _create_food():
+        nonlocal food_x, food_y
+        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:
+            # 为了防止食物出到蛇身上
+            food_x = random.randint(scope_x[0], scope_x[1])
+            food_y = random.randint(scope_y[0], scope_y[1])
+
+    _init_snake()
+    _create_food()
+
+    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
+                        _init_snake()
+                        _create_food()
+                        pos_x = 1
+                        pos_y = 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_y:
+                        pos_x = 0
+                        pos_y = -1
+                        b = False
+                elif event.key in (K_s, K_DOWN):
+                    if b and not pos_y:
+                        pos_x = 0
+                        pos_y = 1
+                        b = False
+                elif event.key in (K_a, K_LEFT):
+                    if b and not pos_x:
+                        pos_x = -1
+                        pos_y = 0
+                        b = False
+                elif event.key in (K_d, K_RIGHT):
+                    if b and not pos_x:
+                        pos_x = 1
+                        pos_y = 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 game_over:
+            if start:
+                print_text(screen, font2, (SCREEN_WIDTH - fwidth) // 2, (SCREEN_HEIGHT - fheight) // 2, 'GAME OVER',
+                           red)
+        else:
+            curTime = time.time()
+            if curTime - last_move_time > speed:
+                if not pause:
+                    b = True
+                    last_move_time = curTime
+                    next_s = (snake[0][0] + pos_x, snake[0][1] + pos_y)
+                    if next_s[0] == food_x and next_s[1] == food_y:
+                        # 吃到了食物
+                        _create_food()
+                        snake.appendleft(next_s)
+                        score += 10
+                        speed = orispeed - 0.03 * (score // 100)
+                    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, light, (food_x * SIZE, food_y * 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}')
+
+        pygame.display.update()
+
+
+if __name__ == '__main__':
+    main()