diff --git a/maker-py/camera.py b/maker-py/camera.py
deleted file mode 100644
index 0b8d77a..0000000
--- a/maker-py/camera.py
+++ /dev/null
@@ -1,75 +0,0 @@
-from typing import Tuple, Optional
-
-# from pyglet.gl import gl
-from pyglet.math import Mat4, Vec3
-from pyglet.graphics import Group
-
-
-class GroupCamera(Group):
-    """
-    A camera by group
-    can be used by just added to your widget
-    """
-
-    def __init__(
-        self,
-        window,
-        order: int = 0,
-        parent: Optional[Group] = None,
-        view_x: Optional[int] = 0,
-        view_y: Optional[int] = 0,
-        zoom: Optional[float] = 1.0,
-        min_zoom: Optional[float] = 1.0,
-        max_zoom: Optional[float] = 1.0,
-    ):
-        super().__init__(order=order, parent=parent)
-        self._window = window
-        self._previous_view = None
-
-        self._view_x = view_x or 0
-        self._view_y = view_y or 0
-        self._zoom = zoom or 1.0
-        self.min_zoom = min_zoom or 1.0
-        self.max_zoom = max_zoom or 1.0
-
-    @property
-    def view_x(self) -> int:
-        return self._view_x
-
-    @view_x.setter
-    def view_x(self, value: int):
-        self._view_x = value
-
-    @property
-    def view_y(self) -> int:
-        return self._view_y
-
-    @view_y.setter
-    def view_y(self, value: int):
-        self._view_y = value
-
-    @property
-    def zoom(self) -> float:
-        return min(max(self._zoom, self.min_zoom), self.max_zoom)
-
-    @zoom.setter
-    def zoom(self, value: float):
-        self._zoom = value
-
-    def reset(self):
-        self._view_x = 0
-        self._view_y = 0
-        self.zoom = 1
-
-    def set_state(self):
-        self._previous_view = self._window.view
-
-        view = Mat4.from_translation(Vec3(self._view_x, self._view_y, 0))
-        if self._zoom == 1.0:
-            self._window.view = view
-        else:
-            view = view.scale(Vec3(self._zoom, self._zoom, 1))
-            self._window.view = view
-
-    def unset_state(self):
-        self._window.view = self._previous_view
diff --git a/maker-py/main.py b/maker-py/main.py
index 23ac7c0..350e848 100644
--- a/maker-py/main.py
+++ b/maker-py/main.py
@@ -137,6 +137,16 @@ class MainWindow(Window):
         self.num_dict = {}
         self.num_batch = Batch()
         self.num_group = Group(parent=self.main_group, order=10)
+        # 用于覆盖掉 num 顶上多出来的部分
+        self.num_cover = Rectangle(
+            x=40,
+            y=50,
+            width=35,
+            height=20,
+            color=(0, 255, 255, 255),
+            batch=self.num_batch,
+            group=self.num_group,
+        )
         # 从大到小
         num_group = Group(parent=self.num_group, order=10)
         for i in range(256):