From d661e2df92b606db873bd114886b97c1b7a292cd Mon Sep 17 00:00:00 2001
From: march3 <gang.wei@qq.com>
Date: Sat, 17 Jun 2023 14:55:36 +0800
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---
 bodies/saturn.py                              |  7 +-
 .../solar_system/solarsystem_planets_size.py  | 68 +++++++++++++++++++
 2 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 sim_scenes/solar_system/solarsystem_planets_size.py

diff --git a/bodies/saturn.py b/bodies/saturn.py
index a5bed5f..e6a4c9c 100644
--- a/bodies/saturn.py
+++ b/bodies/saturn.py
@@ -43,15 +43,20 @@ class Saturn(Body):
             "trail_color": trail_color,
             "show_name": show_name
         }
+        self.__has_rings = True
         super().__init__(**params)
 
+    def show_rings(self, value):
+        self.__has_rings = value
+        return self
+
     @property
     def has_rings(self):
         """
         土星带光环的天体
         @return:
         """
-        return True
+        return self.__has_rings
 
     @property
     def rings_color(self):
diff --git a/sim_scenes/solar_system/solarsystem_planets_size.py b/sim_scenes/solar_system/solarsystem_planets_size.py
new file mode 100644
index 0000000..2772b65
--- /dev/null
+++ b/sim_scenes/solar_system/solarsystem_planets_size.py
@@ -0,0 +1,68 @@
+# -*- coding:utf-8 -*-
+# title           :太阳系行星大小比较
+# description     :太阳系行星大小比较
+# author          :Python超人
+# date            :2023-06-17
+# link            :https://gitcode.net/pythoncr/
+# python_version  :3.8
+# ==============================================================================
+from bodies import Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Moon
+from common.consts import SECONDS_PER_HOUR, SECONDS_PER_DAY, AU
+from sim_scenes.func import mayavi_run, ursina_run
+from simulators.ursina.entities.body_timer import TimeData
+from simulators.ursina.ursina_event import UrsinaEvent
+
+
+# 地球和月球之间的距离常量，距地距离约: 363104 至 405696 km，平均距离 384000 km
+E_M_DISTANCE = 405696
+earth = Earth("地球", init_position=[0, 0, 0])
+moon = Moon("月球", init_position=[E_M_DISTANCE, 0, 0])
+
+bodies = [
+    earth, moon,
+    Mercury(name="水星"),
+    Venus(name="金星"),
+    Mars(name="火星"),
+    Jupiter(name="木星"),
+    Saturn(name="土星").show_rings(False),
+    Uranus(name="天王星"),
+    Neptune(name="海王星"),
+    Pluto(name="冥王星")
+]
+
+# 从第三个星球（水星）开始
+index = 2
+last_total_hours = 0
+
+if __name__ == '__main__':
+    last_diameter = earth.diameter / 2
+    plant_positions = []
+    for i, body in enumerate(bodies):
+        body.ignore_mass = True
+        body.init_velocity = [0, 0, 0]
+        if i >= 2:  # 从第三个星球（水星）开始
+            plant_positions.append([(body.diameter / 2) + last_diameter, 0, 0])
+            last_diameter += body.diameter
+
+    def on_timer_changed(time_data: TimeData):
+        global index, last_total_hours
+
+        if index >= len(bodies):
+            return
+        total_hours = int(time_data.total_hours)
+        if total_hours % 3 == 0 and last_total_hours != total_hours:
+            last_total_hours = total_hours
+            bodies[index].init_position = plant_positions[index - 2]
+            index += 1
+
+
+    # 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_HOUR,
+               position=(E_M_DISTANCE / 2, 0, -E_M_DISTANCE * 1),
+               view_closely=True,
+               timer_enabled=True)
-- 
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