From 0b5e9d4a8bda88a9ccd69477e3d80b5512c61160 Mon Sep 17 00:00:00 2001
From: german2020 <german2020@gitee.com>
Date: Sun, 27 Aug 2023 15:35:22 +0800
Subject: [PATCH] add zorder to mobject

---
 manimlib/mobject/mobject.py | 3 +++
 manimlib/scene/scene.py     | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index 9f4f2a18..911bc73f 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -83,6 +83,7 @@ class Mobject(object):
         # If true, the mobject will not get rotated according to camera position
         is_fixed_in_frame: bool = False,
         depth_test: bool = False,
+        zorder: int = 0,
     ):
         self.color = color
         self.opacity = opacity
@@ -90,6 +91,8 @@ class Mobject(object):
         self.texture_paths = texture_paths
         self._is_fixed_in_frame = is_fixed_in_frame
         self.depth_test = depth_test
+        self.zorder = zorder
+        self._scene_order = 0
 
         # Internal state
         self.submobjects: list[Mobject] = []
diff --git a/manimlib/scene/scene.py b/manimlib/scene/scene.py
index ed4bd5fc..8fa807e3 100644
--- a/manimlib/scene/scene.py
+++ b/manimlib/scene/scene.py
@@ -414,7 +414,13 @@ class Scene(object):
         foreground in the order with which they are added.
         """
         self.remove(*new_mobjects)
+        idx = 0
+        scene_order = len(self.mobjects)
+        for m in new_mobjects:
+            m._scene_order = scene_order+idx
+            idx += 1
         self.mobjects += new_mobjects
+        self.mobjects = [self.mobjects[0]]+sorted(self.mobjects[1:], key=lambda m:(m.zorder,m._scene_order))
         self.id_to_mobject_map.update({
             id(sm): sm
             for m in new_mobjects