太阳系三体模拟器

common/system.py

@@ -80,11 +80,11 @@ class System(object):
             """
             if not body.appeared:  # 不显示
                 return False
-            if self.max_distance > 0:
-                # 超过了 max_distance 距离，则不显示，并消失
-                if calculate_distance(body.position) > self.max_distance:
-                    body.appeared = False
-                    return False
+            # if self.max_distance > 0:
+            #     # 超过了 max_distance 距离，则不显示，并消失
+            #     if calculate_distance(body.position) > self.max_distance:
+            #         body.appeared = False
+            #         return False
 
             return True
 

simulators/ursina/ursina_config.py

@@ -28,6 +28,10 @@ class UrsinaConfig:
 
     __on_reset_funcs = []
 
+    show_trail = False
+    # 拖尾球体的数量
+    trail_length = 200
+
     @property
     @classmethod
     def run_speed_factor(cls):

simulators/ursina/ursina_ui.py

@@ -39,10 +39,23 @@ class UrsinaUI:
         self.slider_body_spin_factor.on_value_changed = self.on_slider_body_spin_changed
         self.slider_run_speed_factor.on_value_changed = self.on_slider_run_speed_changed
         self.slider_control_speed_factor.on_value_changed = self.on_slider_control_speed_changed
+
+        self.slider_trail_length = Slider(text="拖尾长度", y=-.1, step=1, min=30, max=500, default=UrsinaConfig.trail_length,
+                                                  color=color.rgba(0.0, 0.0, 0.0, 0.5))
+        self.slider_trail_length.on_value_changed = self.on_slider_trail_length_changed
+
+
         self.on_off_switch = ButtonGroup(('||', '○'), min_selection=1, y=0, default='○',
                                          selected_color=color.green, ignore_paused=True,
                                          color=color.rgba(0.0, 0.0, 0.0, 0.5))
         self.on_off_switch.selected_color = color.red
+
+        self.on_off_trail = ButtonGroup((' ', '...'), min_selection=1, y=0, default=' ',
+                                         selected_color=color.green, ignore_paused=True,
+                                         color=color.rgba(0.0, 0.0, 0.0, 0.5))
+
+        self.on_off_trail.on_value_changed = self.on_off_trail_changed
+
         self.point_button = Button(text='寻找', origin=(0, 0), y=2,
                                    on_click=self.on_point_button_click, color=color.rgba(0.0, 0.0, 0.0, 0.5))
         self.reset_button = Button(text='重置', origin=(0, 0), y=2,
@@ -57,6 +70,8 @@ class UrsinaUI:
                 self.point_button,
                 self.reset_button,
                 self.on_off_switch,
+                self.on_off_trail,
+                self.slider_trail_length,
                 self.slider_body_spin_factor,
                 self.slider_run_speed_factor,
                 self.slider_control_speed_factor
@@ -67,6 +82,12 @@ class UrsinaUI:
         wp.x = -wp.scale_x
         self.wp = wp
 
+    def on_off_trail_changed(self):
+        if self.on_off_trail.value == "...":
+            UrsinaConfig.show_trail = True
+        else:
+            UrsinaConfig.show_trail = False
+
     def on_point_button_click(self):
         pass
 
@@ -81,6 +102,9 @@ class UrsinaUI:
             self.on_off_switch.selected_color = color.red
             application.paused = False
 
+    def on_slider_trail_length_changed(self):
+        UrsinaConfig.trail_length = int(self.slider_trail_length.value)
+
     def on_slider_control_speed_changed(self):
         application.time_scale = self.slider_control_speed_factor.value
 

simulators/views/ursina_view.py

@@ -76,19 +76,9 @@ class Planet(Entity):
 
     def on_reset(self):
         # 删除拖尾
-        for entity, pos in self.trails.items():
-            destroy(entity)
+        self.clear_trails()
         self.body_view.body.reset()
 
-        # pos = body.init_position * body.distance_scale * UrsinaConfig.SCALE_FACTOR
-        # vel = body.init_velocity
-        # self.x = -pos[1]
-        # self.y = pos[2]
-        # self.z = pos[0]
-        # self.x = pos[0]
-        # self.y = pos[1]
-        # self.z = pos[2]
-
     def __init__(self, body_view: BodyView):
         self.body_view = body_view
         self.rotation_speed = self.body_view.body.rotation_speed
@@ -139,8 +129,6 @@ class Planet(Entity):
         """
         # 存放拖尾球体
         self.trails = {}
-        # 拖尾球体的数量
-        self.trail_len = 100
 
         # 根据天体的颜色获取拖尾的颜色
         trail_color = conv_to_vec4_color(self.body_view.body.color)
@@ -190,7 +178,7 @@ class Planet(Entity):
         self.trails[self.create_trail(pos)] = pos
 
         # 计算拖尾球体超过的数量
-        trail_overflow_count = len(self.trails) - self.trail_len
+        trail_overflow_count = len(self.trails) - UrsinaConfig.trail_length
 
         if trail_overflow_count > 0:
             # 如果拖尾球体超过的数量，就删除之前的拖尾球体
@@ -248,9 +236,12 @@ class Planet(Entity):
                                        self.rotation_y,
                                        self.rotation_z)
 
-        # 有时候第一个位置不正确，所以判断一下有历史记录后在创建
-        if len(self.body_view.body.his_position()) > 1:
-            self.create_trails()
+        if UrsinaConfig.show_trail:
+            # 有时候第一个位置不正确，所以判断一下有历史记录后在创建
+            if len(self.body_view.body.his_position()) > 1:
+                self.create_trails()
+        else:
+            self.clear_trails()
 
     def follow_parent(self):
         if not hasattr(self.body_view, "bodies_system"):
@@ -284,13 +275,18 @@ class Planet(Entity):
         # 设置行星环不受灯光影响，否则看不清行星环
         self.ring.set_light_off()
 
+    def clear_trails(self):
+        if not hasattr(self, "trails"):
+            return
+        # 删除拖尾
+        for entity, pos in self.trails.items():
+            destroy(entity)
+
     def destroy_all(self):
         # 从天体系统中移除自己（TODO:暂时还不能移除）
         # self.body_view.bodies_system.bodies.remove(self.body_view.body)
-
         # 删除拖尾
-        for entity, pos in self.trails.items():
-            destroy(entity)
+        self.clear_trails()
         # 如果有行星环，则删除行星环
         if hasattr(self, "ring"):
             destroy(self.ring)