src/scenes/base_scene.py

@@ -1,8 +1,9 @@
 import pygame
 
 class BaseScene:
-    def __init__(self, screen: pygame.Surface):
+    def __init__(self, screen: pygame.Surface, clock: pygame.time.Clock):
         self.screen = screen
+        self.clock = clock
         self.next_scene = None
 
     def update(self):

src/scenes/main_menu_scene.py

@@ -1,4 +1,5 @@
 import os
+import random
 
 import pygame
 from src.config.color import Color
@@ -8,11 +9,17 @@ from src.scenes.game_scene import GameScene
 
 
 class MainMenuScene(BaseScene):
-    def __init__(self, screen):
-        super().__init__(screen)
+    def __init__(self, screen, clock):
+        super().__init__(screen, clock)
         self.button_status = False
         self.debug_status = False
 
+        # 雨滴列表
+        self.rain_max = 50
+        self.rain_list = []
+        # 雨滴生命周期
+        self.rain_live_max = 6
+
         # 设置字体
         font_file = os.path.join(data_path(),"Dymon-ShouXieTi.otf")
         self.font = pygame.font.Font(font_file,16)
@@ -20,6 +27,9 @@ class MainMenuScene(BaseScene):
         # 文本
         self.game_info_text = self.font.render('按任意键开始游戏，鼠标点击退出', True, Color.white)
 
+        # 初始化雨滴
+        self.init_rain(self.rain_max)
+
     def update(self):
         # 按键按下则切换场景
         if self.button_status:
@@ -37,6 +47,9 @@ class MainMenuScene(BaseScene):
         self.__show(text_rect,(0,30))
         self.__show(text_rect.center,(0,45))
 
+        # 雨滴坠落
+        self.rain_fall()
+
     def handle_event(self, event):
         if event.type == pygame.KEYDOWN:
             self.button_status = True
@@ -50,3 +63,61 @@ class MainMenuScene(BaseScene):
             info = str(info)
         info_text = self.font.render(info, True, Color.white)
         self.screen.blit(info_text, dest)
+
+    def __rain_list_append(self, status=0):
+        x = random.randint(0, int(GameConfig.window_x))
+        y = random.randint(0, int(GameConfig.window_y))
+        rain = {
+            "dest": (x, y),
+            "timer": 0,
+            "status": status
+        }
+        self.rain_list.append(rain)
+
+    def init_rain(self, max_num):
+        """
+        初始化雨滴列表，保存雨滴落点的坐标
+        """
+        for i in range(max_num):
+            status = random.randint(1, self.rain_live_max)
+            self.__rain_list_append(status)
+
+
+    def rain_fall(self):
+        """
+        展示雨滴画面
+        """
+        dt = self.clock.tick()
+
+        for rain in self.rain_list:
+
+            # 当状态在区间1时绘制雨滴线条
+            if rain["status"] <= self.rain_live_max - 3:
+                # 线条长度
+                line_len = 10*(self.rain_live_max - rain["status"])
+                # 起点位置
+                x = rain["dest"][0]
+                y = rain["dest"][1] - line_len
+                line_start_point = (x, y)
+                pygame.draw.line(self.screen, Color.white, line_start_point, rain["dest"], 1)
+            # 状态在区间2时绘制涟漪
+            elif self.rain_live_max - 3 < rain["status"]:
+                point_width = rain["status"] - (self.rain_live_max - 3)
+                pygame.draw.circle(self.screen, Color.white, rain["dest"], point_width, 1)
+            # # 椭圆
+            # rain_point_rect = [rain["dest"][0], rain["dest"][1], rain["status"], rain["status"]]
+            # pygame.draw.ellipse(self.screen, Color.white, rain_point_rect, 1)
+
+            # 雨滴状态每d_status毫秒变化一次
+            d_status = 200
+            if rain["timer"] > d_status:
+                rain["status"] += 1
+                rain["timer"] -= d_status  # 不设为0，避免累计时间误差
+
+            # 生命周期走完后销毁并添加新雨滴
+            if rain["status"] > self.rain_live_max:
+                self.rain_list.remove(rain)
+                self.__rain_list_append()
+
+            # timer累计每帧时间
+            rain["timer"] += dt

start.py

@@ -13,8 +13,11 @@ class Game:
         size = (GameConfig.window_x, GameConfig.window_y)
         self.screen = pygame.display.set_mode(size, pygame.NOFRAME)
 
+        # 设置计时器
+        self.clock = pygame.time.Clock()
+
         # 当前场景
-        self.scene = MainMenuScene(self.screen)
+        self.scene = MainMenuScene(self.screen, self.clock)
 
         # 运行循环
         self.running = True