From db9e992fc64f67fd4f3970d6a126e84e58242a02 Mon Sep 17 00:00:00 2001
From: march3 <gang.wei@qq.com>
Date: Fri, 21 Jul 2023 15:30:06 +0800
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---
 sim_scenes/fiction/transformed_planets.py | 72 +++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 sim_scenes/fiction/transformed_planets.py

diff --git a/sim_scenes/fiction/transformed_planets.py b/sim_scenes/fiction/transformed_planets.py
new file mode 100644
index 0000000..d2815f9
--- /dev/null
+++ b/sim_scenes/fiction/transformed_planets.py
@@ -0,0 +1,72 @@
+# -*- coding:utf-8 -*-
+# title           :改造太阳系的宜居带的星球
+# description     :改造太阳系的宜居带的星球
+# author          :Python超人
+# date            :2023-07-21
+# link            :https://gitcode.net/pythoncr/
+# python_version  :3.8
+# ==============================================================================
+from bodies import Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Moon, Asteroids
+from common.consts import SECONDS_PER_WEEK, SECONDS_PER_DAY, SECONDS_PER_YEAR, AU
+from sim_scenes.func import mayavi_run, ursina_run
+import numpy as np
+
+from simulators.ursina.entities.body_timer import TimeData
+from simulators.ursina.ursina_event import UrsinaEvent
+
+if __name__ == '__main__':
+    # 改造太阳系的宜居带的星球
+    #  =====================================================================
+    #  以下展示的效果为太阳系真实的距离
+    #  由于宇宙空间尺度非常大，如果按照实际的天体大小，则无法看到天体，因此需要对天体的尺寸进行放大
+    sun = Sun(name="太阳", size_scale=0.8e2)  # 太阳放大 80 倍，距离保持不变
+    earth_moon_d = 40000000  # 因为地球放大 1800 倍，为了较好的效果，地月距离要比实际大才行
+    moon = Moon(name="月球", size_scale=4e3,
+                texture="transformed/moon.jpg",
+                )
+    earth = Earth(name="地球", size_scale=4e3,
+                  texture="transformed/earth.jpg",
+                  distance_scale=2)
+    bodies = [
+        sun,
+        Mercury(name="水星",
+                size_scale=4e3,
+                texture="transformed/mercury.jpg",
+                distance_scale=2),
+        Venus(name="金星", size_scale=4e3,
+              texture="transformed/venus.jpg",
+              distance_scale=1.8),
+        earth,  # 地球放大 4000 倍，距离放大 1.3 倍
+        moon,
+        Mars(name="火星", size_scale=4e3,
+             texture="transformed/mars.jpg",
+             distance_scale=1.8),
+    ]
+
+
+    def on_timer_changed(time_data: TimeData):
+        # 1个月有29.5天
+        days_per_month = 29.5
+        # 1天多少角度
+        angle_per_day = 360 / days_per_month
+        # 当前天数的角度（度）
+        angle = time_data.total_days * angle_per_day
+        # 当前天数的角度（弧度）
+        angle = angle * np.pi / 180
+        # 计算月亮的坐标（这里没有用到万有引力）
+        px = earth_moon_d * np.cos(angle)
+        pz = earth_moon_d * np.sin(angle)
+        moon.position = [earth.position[0] * earth.distance_scale + px,
+                         0,
+                         earth.position[2] * earth.distance_scale + pz]
+
+
+    # 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_WEEK,
+               timer_enabled=True,
+               position=(0, 2 * AU, -11 * AU))
-- 
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