Python超人-宇宙模拟器

sim_scenes/science/four_seasons.py

@@ -13,59 +13,72 @@ from simulators.ursina.entities.body_timer import TimeData
 from simulators.ursina.ursina_event import UrsinaEvent
 from ursina import camera
 
+
+def create_earth(name, text_color, position):
+    """
+    创建透明的地球
+    @param name: 名称
+    @param text_color: 文字颜色
+    @param position: 地球的位置
+    @return:
+    """
+    return Earth(name=name, size_scale=5e3, texture="earth_transparent.png",  # 明的地球纹理
+                 text_color=text_color, rotation_speed=0,
+                 init_position=position, init_velocity=[0, 0, 0]).set_ignore_gravity(True)  # 忽略重力
+
+
 if __name__ == '__main__':
     """
-    太阳、地球
+    摄像机以太阳的视角看地球（四季和24节气）
     """
+    sun = Sun(size_scale=5e1, texture="transparent.png")  # 太阳使用透明纹理，不会遮挡摄像机
+    # 在 4 个节气的位置创建固定不动的透明地球
+    earth_1 = create_earth(name="春分", text_color=(0, 255, 0), position=[-1.05 * AU, 0, 0])
+    earth_2 = create_earth(name="夏至", text_color=(255, 0, 0), position=[0, 0, -1.05 * AU])
+    earth_3 = create_earth(name="秋分", text_color=(255, 255, 0), position=[1.05 * AU, 0, 0])
+    earth_4 = create_earth(name="冬至", text_color=(0, 255, 255), position=[0, 0, 1.05 * AU])
+    # 运动的地球
+    earth = Earth(size_scale=5e3, texture="earth_hd.jpg",
+                  text_color=[255, 255, 255], rotation_speed=1,
+                  init_position=[-1 * AU, 0, 0], init_velocity=[0, 0, -29.79])
+
     bodies = [
-        Sun(size_scale=5e1, texture="transparent.png"),  # 太阳透明
-        Earth(name="中国春天", size_scale=5e3, texture="earth_hd.jpg", text_color=(0, 255, 0),
-              init_position=[-1 * AU, 0, 0], init_velocity=[0, 0, -29.79]),
-        Earth(name="中国夏天", size_scale=5e3, texture="earth_hd.jpg", text_color=(255, 0, 0),
-              init_position=[0, 0, -1 * AU], init_velocity=[29.79, 0, 0]),
-        Earth(name="中国秋天", size_scale=5e3, texture="earth_hd.jpg", text_color=(255, 255, 0),
-              init_position=[1 * AU, 0, 0], init_velocity=[0, 0, 29.79]),
-        Earth(name="中国冬天", size_scale=5e3, texture="earth_hd.jpg", text_color=(0, 255, 255),
-              init_position=[0, 0, 1 * AU], init_velocity=[-29.79, 0, 0]),
+        sun, earth,
+        earth_1, earth_2, earth_3, earth_4,
     ]
-    sun = bodies[0]
-    earth_1 = bodies[1]
-    earth_2 = bodies[2]
-    earth_3 = bodies[3]
-    earth_4 = bodies[4]
 
+    # 四季
+    seasons_angles = [("春天", -135, -45), ("夏天", -180, -135),
+                      ("夏天", 135, 180), ("秋天", 45, 135), ("冬天", -45, 45)]
 
-    def on_ready():
-        # 摄像机跟随地球（模拟在地球上看到的效果）
-        # camera.position = earth.planet.position
-        # camera.forward = -10 * AU
-        # # camera.x = camera.x - AU / 100
-        # camera.look_at(earth.planet)
-        earth_1.planet.rotation_y += 115  # 春天
-        earth_2.planet.rotation_y += 15  # 夏天
-        earth_3.planet.rotation_y -= 80  # 秋天
-        earth_4.planet.rotation_y -= 145  # 冬天
+    # 中国农历24节气表
+    solar_terms_angles = [
+        ("小寒", -22.5, -7.5), ("大寒", -37.5, -22.5), ("立春", -52.5, -37.5), ("雨水", -67.5, -52.5),
+        ("惊蛰", -82.5, -67.5), ("春分", -97.5, -82.5), ("清明", -112.5, -97.5), ("谷雨", -127.5, -112.5),
+        ("立夏", -142.5, -127.5), ("小满", -157.5, -142.5), ("芒种", -172.5, -157.5),
+        ("夏至", -180, -172.5), ("夏至", 172.5, 180),
+        ("小暑", 157.5, 172.5), ("大暑", 142.5, 157.5), ("立秋", 127.5, 142.5), ("处暑", 112.5, 127.5),
+        ("白露", 97.5, 112.5), ("秋分", 82.5, 97.5), ("寒露", 67.5, 82.5), ("霜降", 52.5, 67.5),
+        ("立冬", 37.5, 52.5), ("小雪", 22.5, 37.5), ("大雪", 7.5, 22.5), ("冬至", -7.5, 7.5)]
 
-        # camera.parent = sun.planet
-        camera.look_at(earth_1.planet)
-        camera.rotation_z = 0
-        # camera.position=[0,0,0]
-        pass
 
-        # if hasattr(camera, "sky"):
-        #     # 摄像机跟随地球后，需要对深空背景进行调整，否则看到的是黑色背景
-        #     camera.sky.scale = 800
-        #     camera.clip_plane_near = 0.1
-        #     camera.clip_plane_far = 1000000
-        #     # camera.fov = 40
+    def on_ready():
+        # 将 4 个节气位置的地球进行旋转，让中国面对太阳
+        earth_1.planet.rotation_y += 115  # 春分
+        earth_2.planet.rotation_y += 15  # 夏至
+        earth_3.planet.rotation_y -= 80  # 秋分
+        earth_4.planet.rotation_y -= 145  # 冬至
 
 
     def on_timer_changed(time_data: TimeData):
-        # 时时刻刻的让地球看向太阳（摄像机跟随地球看向太阳）
-        # earth.planet.look_at(sun.planet)
-        # earth.planet.rotation_z = 0
-        # camera.look_at(earth.planet)
-        pass
+        # 摄像机始终看向移动的地球
+        camera.look_at(earth.planet)
+        camera.rotation_z = 0
+        # 根据角度判断，显示中国农历24节气
+        for info in solar_terms_angles:
+            if info[1] <= camera.rotation_y < info[2]:
+                earth.planet.name_text.text = info[0]
+        # print(camera.rotation_y)
 
 
     UrsinaEvent.on_ready_subscription(on_ready)
@@ -74,6 +87,7 @@ if __name__ == '__main__':
     # 使用 ursina 查看的运行效果
     # 常用快捷键： P：运行和暂停  O：重新开始  I：显示天体轨迹
     # position = 左-右+、上+下-、前+后-
-    ursina_run(bodies, 1, position=(0, 0, 0),
+    ursina_run(bodies, SECONDS_PER_DAY * 3,
+               position=(0, 0, 0),  # 摄像机和太阳是相同位置
                show_name=True,
-               show_trail=True)
+               show_timer=True)