diff --git a/DungeonShooting_Godot/project.godot b/DungeonShooting_Godot/project.godot
index 8f16079..a14b877 100644
--- a/DungeonShooting_Godot/project.godot
+++ b/DungeonShooting_Godot/project.godot
@@ -11,7 +11,7 @@
 [application]
 
 config/name="DungeonShooting"
-run/main_scene="res://scene/Main.tscn"
+run/main_scene="res://scene/test/TestMask.tscn"
 config/features=PackedStringArray("4.2", "C#")
 config/icon="res://icon.png"
 
diff --git a/DungeonShooting_Godot/resource/material/Mask.gdshader b/DungeonShooting_Godot/resource/material/Mask.gdshader
new file mode 100644
index 0000000..1c44ff4
--- /dev/null
+++ b/DungeonShooting_Godot/resource/material/Mask.gdshader
@@ -0,0 +1,9 @@
+shader_type canvas_item;
+
+uniform sampler2D mask_texture;
+
+void fragment() {
+	vec2 size = TEXTURE_PIXEL_SIZE;
+	COLOR.a = 1.0 - texture(mask_texture, UV).a;
+}
+
diff --git a/DungeonShooting_Godot/scene/test/TestMask.tscn b/DungeonShooting_Godot/scene/test/TestMask.tscn
new file mode 100644
index 0000000..2fbff95
--- /dev/null
+++ b/DungeonShooting_Godot/scene/test/TestMask.tscn
@@ -0,0 +1,10 @@
+[gd_scene load_steps=2 format=3 uid="uid://cnt6y33q15xfq"]
+
+[ext_resource type="Script" path="res://src/test/TestMask.cs" id="1_0yip6"]
+
+[node name="TestMask" type="Node2D"]
+script = ExtResource("1_0yip6")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+modulate = Color(0, 0, 0, 1)
+centered = false
diff --git a/DungeonShooting_Godot/src/framework/Grid.cs b/DungeonShooting_Godot/src/framework/Grid.cs
index ec37b93..b73f989 100644
--- a/DungeonShooting_Godot/src/framework/Grid.cs
+++ b/DungeonShooting_Godot/src/framework/Grid.cs
@@ -11,7 +11,7 @@
     /// 遍历网格数据回调
     /// </summary>
     public delegate void EachGridCallback(int x, int y, T data);
-    
+
     private readonly Dictionary<int, Dictionary<int, T>> _map = new Dictionary<int, Dictionary<int, T>>();
 
     /// <summary>
diff --git a/DungeonShooting_Godot/src/framework/common/Utils.cs b/DungeonShooting_Godot/src/framework/common/Utils.cs
index d139167..4bda9ac 100644
--- a/DungeonShooting_Godot/src/framework/common/Utils.cs
+++ b/DungeonShooting_Godot/src/framework/common/Utils.cs
@@ -261,4 +261,12 @@
         
         return point;
     }
+
+    /// <summary>
+    /// 将 point 位置限制在 anchor 的周围, 最大距离为 distance, 并返回新的位置
+    /// </summary>
+    public static Vector2 ConstrainDistance(Vector2 point, Vector2 anchor, float distance)
+    {
+        return (point - anchor).Normalized() * distance + anchor;
+    }
 }
\ No newline at end of file
diff --git a/DungeonShooting_Godot/src/test/TestMask.cs b/DungeonShooting_Godot/src/test/TestMask.cs
new file mode 100644
index 0000000..9679da0
--- /dev/null
+++ b/DungeonShooting_Godot/src/test/TestMask.cs
@@ -0,0 +1,36 @@
+using Godot;
+using System;
+
+public partial class TestMask : Node2D
+{
+	private Sprite2D Sprite;
+	private Image _image;
+	private ImageTexture _texture;
+
+	private Image _maskImage;
+	private Grid<int> _grid;
+	
+	public override void _Ready()
+	{
+		Sprite = GetNode<Sprite2D>("Sprite2D");
+		var size = DisplayServer.WindowGetSize();
+		_image = Image.Create(size.X, size.Y, false, Image.Format.Rgba8);
+		//_image.Fill(Colors.Black);
+		_texture = ImageTexture.CreateFromImage(_image);
+		Sprite.Texture = _texture;
+		_maskImage = ResourceManager.Load<Texture2D>(ResourcePath.icon_png).GetImage();
+		//Godot.c
+		//_grid.set
+	}
+
+
+	public override void _Process(double delta)
+	{
+		if (Input.IsMouseButtonPressed(MouseButton.Left))
+		{
+			var usedRect = _maskImage.GetUsedRect();
+			_image.BlendRect(_maskImage, usedRect, GetLocalMousePosition().AsVector2I() - usedRect.Size / 2);
+			_texture.Update(_image);
+		}
+	}
+}