From 5552d087c5b02f7ae9b61171b6b7cb4c6da79ba0 Mon Sep 17 00:00:00 2001
From: march3 <gang.wei@qq.com>
Date: Tue, 4 Jul 2023 10:59:06 +0800
Subject: [PATCH] =?UTF-8?q?Python=E8=B6=85=E4=BA=BA-=E5=AE=87=E5=AE=99?=
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---
 sim_scenes/func.py                      |  4 ++++
 sim_scenes/science/speed_of_light_3d.py | 12 ++++++++++--
 simulators/ursina/ursina_event.py       | 15 +++++++++++++++
 simulators/ursina_simulator.py          |  5 ++++-
 4 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/sim_scenes/func.py b/sim_scenes/func.py
index d404eef..2064cc8 100644
--- a/sim_scenes/func.py
+++ b/sim_scenes/func.py
@@ -307,11 +307,15 @@ def create_3d_card(left=-.885, top=0.495, width=0.02, height=0.02):
         position=(left, top, 0)
     )
 
+    panel.switch_flag = 0
+
     def switch_color():
         if panel.color == color.black:
             panel.color = color.white
+            panel.switch_flag = 1
         else:
             panel.color = color.black
+            panel.switch_flag = 0
 
     panel.switch_color = switch_color
 
diff --git a/sim_scenes/science/speed_of_light_3d.py b/sim_scenes/science/speed_of_light_3d.py
index 1c3743c..76f29cd 100644
--- a/sim_scenes/science/speed_of_light_3d.py
+++ b/sim_scenes/science/speed_of_light_3d.py
@@ -98,12 +98,18 @@ def on_timer_changed(time_data: TimeData):
     distance = round(init.light_ship.position[2] / AU, 4)
     text = init.arrived_info.replace("${distance}", "%.4f AU" % distance)
     init.text_panel.text = text.replace("${speed}", str(round(velocity / LIGHT_SPEED, 1)) + "倍光速")
-    init._3d_card.switch_color()
-    light_ship.switch_position()
+
     # if time_data.total_seconds > 20:
     #     wait_for(0.03)
 
 
+def on_before_evolving(evolve_args):
+    init._3d_card.switch_color()
+    light_ship.switch_position()
+    if init._3d_card.switch_flag == 1:
+        evolve_args["evolve_dt"] = 0.0
+
+
 # 订阅重新开始事件
 # 按键盘的 “O” 重置键会触发 on_reset
 UrsinaEvent.on_reset_subscription(on_reset)
@@ -113,6 +119,8 @@ 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)
 
+UrsinaEvent.on_before_evolving_subscription(on_before_evolving)
+
 
 def body_arrived(body):
     # # 到达每个行星都会触发，对光速飞船进行加速，超光速前进（使用未来曲率引擎技术）
diff --git a/simulators/ursina/ursina_event.py b/simulators/ursina/ursina_event.py
index 9532cc6..a0bc6db 100644
--- a/simulators/ursina/ursina_event.py
+++ b/simulators/ursina/ursina_event.py
@@ -36,6 +36,8 @@ class UrsinaEvent:
         UrsinaEvent.on_body_size_changed_callback = []
         # 逐步演变触发的订阅事件
         UrsinaEvent.on_evolving_callback = []
+        # 逐步演变触发前的订阅事件
+        UrsinaEvent.on_before_evolving_callback = []
         # 计时器触发的订阅事件
         UrsinaEvent.on_timer_changed_callback = []
 
@@ -78,6 +80,19 @@ class UrsinaEvent:
         for f in UrsinaEvent.on_evolving_callback:
             f(evolve_dt)
 
+    @staticmethod
+    def on_before_evolving_subscription(fun):
+        UrsinaEvent.on_before_evolving_callback.append(fun)
+
+    @staticmethod
+    def on_before_evolving_unsubscription(fun):
+        UrsinaEvent.on_before_evolving_callback.remove(fun)
+
+    @staticmethod
+    def on_before_evolving(evolve_args):
+        for f in UrsinaEvent.on_before_evolving_callback:
+            f(evolve_args)
+
     @staticmethod
     def on_application_run_callback_subscription(fun):
         UrsinaEvent.on_application_run_callback.append(fun)
diff --git a/simulators/ursina_simulator.py b/simulators/ursina_simulator.py
index 1223d95..e196871 100644
--- a/simulators/ursina_simulator.py
+++ b/simulators/ursina_simulator.py
@@ -224,7 +224,10 @@ class UrsinaSimulator(Simulator):
             UrsinaEvent.on_evolving(evolve_dt)
             # interval_fator 能让更新天体运行状态（位置、速度）更精确
             evolve_dt = evolve_dt * self.interval_fator
-            super().evolve(evolve_dt)
+            evolve_args = {"evolve_dt": evolve_dt}
+            UrsinaEvent.on_before_evolving(evolve_args)
+            # if evolve_args["evolve_dt"] > 0:
+            super().evolve(evolve_args["evolve_dt"])
 
             if self.show_timer or self.timer_enabled:
                 timer = BodyTimer()
-- 
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