From 69a1da53aba7f5a4315f15cc036e576da792a52d Mon Sep 17 00:00:00 2001
From: march3 <gang.wei@qq.com>
Date: Wed, 2 Aug 2023 17:58:15 +0800
Subject: [PATCH] =?UTF-8?q?Python=E8=B6=85=E4=BA=BA-=E5=AE=87=E5=AE=99?=
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---
 objs/__init__.py                       |  1 +
 sim_scenes/tri_bodies/water_drop_01.py | 95 ++++++++++++++++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 sim_scenes/tri_bodies/water_drop_01.py

diff --git a/objs/__init__.py b/objs/__init__.py
index 6ce717b..650c44f 100644
--- a/objs/__init__.py
+++ b/objs/__init__.py
@@ -8,3 +8,4 @@ from objs.rock_snow import RockSnow
 from objs.rock import Rock, create_rock
 from objs.core_valaga_clas import CoreValagaClas
 from objs.sci_fi_bomber import SciFiBomber
+from objs.water_drop import WaterDrop
diff --git a/sim_scenes/tri_bodies/water_drop_01.py b/sim_scenes/tri_bodies/water_drop_01.py
new file mode 100644
index 0000000..bbeb6e8
--- /dev/null
+++ b/sim_scenes/tri_bodies/water_drop_01.py
@@ -0,0 +1,95 @@
+# -*- coding:utf-8 -*-
+# title           :地月场景模拟
+# description     :地月场景模拟（月球始终一面朝向地球、月球对地球的扰动）
+# author          :Python超人
+# date            :2023-05-01
+# link            :https://gitcode.net/pythoncr/
+# python_version  :3.8
+# ==============================================================================
+
+
+from bodies import Sun, Earth, Moon
+from objs import CoreValagaClas, SciFiBomber, WaterDrop
+from common.consts import AU, SECONDS_PER_DAY, SECONDS_PER_WEEK, SECONDS_PER_MONTH
+from sim_scenes.func import ursina_run, camera_look_at
+from simulators.ursina.entities.body_timer import TimeData
+from simulators.ursina.entities.entity_utils import create_directional_light
+from simulators.ursina.ursina_config import UrsinaConfig
+from simulators.ursina.ursina_event import UrsinaEvent
+
+if __name__ == '__main__':
+    """
+    月球始终一面朝向地球
+    月球对地球的扰动
+    """
+    OFFSETTING = 0
+    # TODO: 可以抵消月球带动地球的力，保持地球在原地
+    # OFFSETTING = 0.01265
+    # sun = Sun(name="太阳", size_scale=6e1, init_position=[0, 0, -AU]).set_ignore_gravity(True)
+    earth = Earth(init_position=[0, -200000, -50000],
+                  texture="earth_hd.jpg",
+                  rotate_angle=-23.44,
+                  init_velocity=[OFFSETTING, 0, 0], size_scale=2.5e1)  # 地球放大 5 倍，距离保持不变
+    water_drop = WaterDrop(init_position=[0, 0, AU / 40],
+                           init_velocity=[-1, 0, 0],
+                           size_scale=5e4)
+    # moon = Moon(init_position=[0, 0, 363104],  # 距地距离约: 363104 至 405696 km
+    #             init_velocity=[-1.03, 0, 0], size_scale=2e1)  # 月球放大 10 倍，距离保持不变
+    # moon.set_light_disable(True)
+    d = 100000
+    x_offset = - 2 * d
+    ship_list = []
+    for x in range(5):
+        for z in range(5):
+            core_valaga_clas = CoreValagaClas(size_scale=15,
+                                              init_position=[x_offset + x * d, -30000, z * d - 20000]).set_ignore_gravity(True)
+            ship_list.append(core_valaga_clas)
+
+    for x in range(5):
+        for z in range(5):
+            sci_fi_bomber = SciFiBomber(size_scale=3.5,
+                                        init_position=[x_offset + x * d, 30000, z * d - 20000]).set_ignore_gravity(True)
+            ship_list.append(sci_fi_bomber)
+
+    earth.rotation_speed /= 6  # 地球的转速降低50倍
+
+    bodies = [earth, water_drop] + ship_list
+
+
+    def on_timer_changed(time_data: TimeData):
+        if time_data.total_days > 27.5:
+            exit(0)
+
+
+    def on_ready():
+        for body in bodies:
+            if isinstance(body, CoreValagaClas):
+                body.planet.rotation_x = 0 # -10
+            elif isinstance(body, SciFiBomber):
+                 body.planet.rotation_x = -90
+
+        water_drop.planet.rotation_z = 90
+
+
+    # 订阅事件后，上面2个函数功能才会起作用
+    # 运行前会触发 on_ready
+    UrsinaEvent.on_ready_subscription(on_ready)
+    # 运行中，每时每刻都会触发 on_timer_changed
+    UrsinaEvent.on_timer_changed_subscription(on_timer_changed)
+
+    # 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,
+               SECONDS_PER_DAY / 24,
+               # SECONDS_PER_WEEK * 4,
+               position=(0, 0, -220000),
+               show_grid=False,
+               # cosmic_bg="",
+               # save_cube_map=True,
+               timer_enabled=True,
+               show_camera_info=False,
+               show_control_info=False,
+               view_closely=True
+               # show_trail=True
+               )
-- 
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