Python超人-宇宙模拟器

sim_scenes/wonders/blue_moon.py

+# -*- coding:utf-8 -*-
+# title           :地球年月的关系
+# description     :地球年月的关系
+# author          :Python超人
+# date            :2023-07-01
+# link            :https://gitcode.net/pythoncr/
+# python_version  :3.8
+# ==============================================================================
+from bodies import Sun, Earth, Moon
+from common.consts import SECONDS_PER_HOUR, SECONDS_PER_HALF_DAY, SECONDS_PER_DAY, SECONDS_PER_WEEK, SECONDS_PER_MONTH
+from sim_scenes.func import mayavi_run, ursina_run, camera_look_at, set_camera_parent
+from bodies.body import AU
+from simulators.ursina.entities.body_timer import TimeData
+from simulators.ursina.ursina_config import UrsinaConfig
+from simulators.ursina.ursina_event import UrsinaEvent
+import numpy as np
+
+sky, moon, moon_blue = None, None, None
+if __name__ == '__main__':
+    """
+    地球年月的关系
+    """
+    resolution = 100
+    # sun = Sun(name="太阳", size_scale=1e2)  # 太阳放大 100 倍，距离保持不变
+    # earth = Earth(name="地球", size_scale=1.8e3)  # 地球放大 1800 倍，距离保持不变
+    # earth_moon_d = 20000000  # 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=9.002e3,  # 月球球放大 3000 倍，为了较好的效果，地月距离要比实际大
+                init_position=[0, 0, 0],
+                init_velocity=[0, 0, 0],
+                rotation_speed=0,
+                ignore_mass=True,
+                ).set_resolution(resolution)
+
+    moon_blue = Moon(name="月球", size_scale=9.00e3,  # 月球球放大 3000 倍，为了较好的效果，地月距离要比实际大
+                     init_position=[0, 0, 0],
+                     init_velocity=[0, 0, 0],
+                     rotation_speed=0,
+                     texture='moon_blue.jpg',
+                     ignore_mass=True,
+                     ).set_resolution(resolution)
+    bodies = [
+        # sun, earth,
+        moon, moon_blue
+    ]
+
+
+    def on_timer_changed(time_data: TimeData):
+        global sky, moon, moon_blue
+        from ursina import camera
+        if sky is not None:
+            sky.rotation_y += 0.005
+            sky.rotation_x += 0.005
+
+        opacity = round((time_data.total_hours - 1) / 10, 2)
+
+        if opacity > 1.0:
+            opacity = 1.0
+        elif opacity < 0.0:
+            opacity = 0.0
+
+        if opacity >= 1.0:
+            moon.planet.enabled = False  # 原火星完全消失
+
+        moon.planet.alpha = 1 - opacity  # 原火星渐渐消失
+
+
+    def on_ready():
+        global sky, moon, moon_blue
+        camera_look_at(moon)
+        from ursina import camera
+        from simulators.ursina.entities.sphere_sky import SphereSky
+        from common.image_utils import find_texture
+        sky_texture = find_texture("bg_pan.jpg", None)
+        sky = SphereSky(texture=sky_texture)
+        sky.scale = 800
+        sky.rotation_y = 90
+        camera.fov = 65
+        pass
+
+
+    # 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-
+    # position=(0, 0, 0) 的位置是站在地球视角，可以观看月相变化的过程
+    ursina_run(bodies,
+               SECONDS_PER_HOUR / 2,
+               # SECONDS_PER_DAY / 10,
+               cosmic_bg='',
+               show_grid=False,
+               position=(0, AU / 2, 0),
+               show_control_info=False,
+               show_camera_info=False,
+               show_timer=False,
+               timer_enabled=True
+               )