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diff --git a/源代码/.vs/StgSharp/v17/.futdcache.v2 b/源代码/.vs/StgSharp/v17/.futdcache.v2
index 5adecef8..7a8fc2b4 100644
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diff --git a/源代码/.vs/StgSharp/v17/.suo b/源代码/.vs/StgSharp/v17/.suo
index f4fb8fe8..d59a9e7b 100644
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diff --git a/源代码/.vs/StgSharp/v17/Browse.VC.db b/源代码/.vs/StgSharp/v17/Browse.VC.db
index 674b9b9a..023fbc9e 100644
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diff --git a/源代码/StgSharp/ClassDiagram1.cd b/源代码/StgSharp/ClassDiagram1.cd
index 03e064e1..61f75821 100644
--- a/源代码/StgSharp/ClassDiagram1.cd
+++ b/源代码/StgSharp/ClassDiagram1.cd
@@ -65,7 +65,7 @@
   <Class Name="StgSharp.INode&lt;T&gt;" Collapsed="true">
     <Position X="19.75" Y="0.5" Width="1.5" />
     <TypeIdentifier>
-      <HashCode>AAAAAAAAAAAAoAAAAABAAAAAAACAAAAAAAAAAAAAAAA=</HashCode>
+      <HashCode>AgAAAAAAAAAAogAAAABAAAAAAACAAAAAAAAAAAAAAAA=</HashCode>
       <FileName>Logic\ContainerNode.cs</FileName>
     </TypeIdentifier>
   </Class>
@@ -87,7 +87,7 @@
   <Class Name="StgSharp.LinkedList&lt;T&gt;" Collapsed="true">
     <Position X="5" Y="1.75" Width="1.5" />
     <TypeIdentifier>
-      <HashCode>AAIIAAABAIAQAQAAAAAABAAAAAgAAAAEAAACAAAAAAA=</HashCode>
+      <HashCode>AAIIAAAAAIAAAQAAAAAABAAAAAgAAAAEAAACAAAAQAA=</HashCode>
       <FileName>Logic\LinkedList.cs</FileName>
     </TypeIdentifier>
     <Lollipop Position="0.2" />
@@ -95,7 +95,7 @@
   <Class Name="StgSharp.Pool" Collapsed="true">
     <Position X="7.25" Y="1.75" Width="1.5" />
     <TypeIdentifier>
-      <HashCode>ACAAAAABAwAYAAAAAQAAAAAAAAABAgAAAAAQIIAAEAA=</HashCode>
+      <HashCode>ACAAAABBAwAYAAAAAQAAAAAAAAABAgAAAAAQIIAAEAA=</HashCode>
       <FileName>Logic\Pool.cs</FileName>
     </TypeIdentifier>
   </Class>
@@ -204,8 +204,8 @@
       <FileName>Geometries\PlainGeometry\Line.cs</FileName>
     </TypeIdentifier>
   </Class>
-  <Class Name="StgSharp.Geometries.Parallelogram">
-    <Position X="27.5" Y="4.75" Width="1.5" />
+  <Class Name="StgSharp.Geometries.Parallelogram" Collapsed="true">
+    <Position X="26" Y="4.75" Width="1.5" />
     <TypeIdentifier>
       <HashCode>AIgCAAAAAAAAAAAAAAABAIABgAAAAAAAAAAC4AIAAAA=</HashCode>
       <FileName>Geometries\PlainGeometry\Parallelogram.cs</FileName>
@@ -247,7 +247,7 @@
       <FileName>Geometries\PlainGeometry\Polygon6.cs</FileName>
     </TypeIdentifier>
   </Class>
-  <Class Name="StgSharp.Geometries.Rectangle">
+  <Class Name="StgSharp.Geometries.Rectangle" Collapsed="true">
     <Position X="24" Y="4.75" Width="1.5" />
     <TypeIdentifier>
       <HashCode>AAgCAAAAAAAAAAAAAAABAAAAgAAAAAAAAAAA4AIAAAA=</HashCode>
@@ -311,6 +311,13 @@
       <FileName>Math\Scalar\Function.cs</FileName>
     </TypeIdentifier>
   </Class>
+  <Class Name="StgSharp.Square">
+    <Position X="28" Y="4.75" Width="1.5" />
+    <TypeIdentifier>
+      <HashCode>AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=</HashCode>
+      <FileName>Geometries\PlainGeometry\Square.cs</FileName>
+    </TypeIdentifier>
+  </Class>
   <Struct Name="StgSharp.Control.GraphicIOPack" Collapsed="true">
     <Position X="48.25" Y="7.75" Width="1.5" />
     <TypeIdentifier>
diff --git a/源代码/StgSharp/Geometries/PlainGeometry/Rectangle.cs b/源代码/StgSharp/Geometries/PlainGeometry/Rectangle.cs
index da8e27cd..87c61671 100644
--- a/源代码/StgSharp/Geometries/PlainGeometry/Rectangle.cs
+++ b/源代码/StgSharp/Geometries/PlainGeometry/Rectangle.cs
@@ -38,7 +38,7 @@ namespace StgSharp.Geometries
         internal override sealed void OnRender(uint tick)
         {
             tick-=bornTick;
-              this.MovCenter(tick);
+            this.MovCenter(tick);
         }
 
     }
diff --git a/源代码/StgSharp/Geometries/PlainGeometry/Square.cs b/源代码/StgSharp/Geometries/PlainGeometry/Square.cs
index 0999c3e7..997c4fe4 100644
--- a/源代码/StgSharp/Geometries/PlainGeometry/Square.cs
+++ b/源代码/StgSharp/Geometries/PlainGeometry/Square.cs
@@ -2,9 +2,11 @@
 using System.Collections.Generic;
 using System.Text;
 
-namespace StgSharp
+namespace StgSharp.Geometries
 {
-    public class Square
+    public class Square:Rectangle
     {
+
+
     }
 }
\ No newline at end of file
diff --git a/源代码/StgSharp/Geometries/PlainGeometry/Triangle.cs b/源代码/StgSharp/Geometries/PlainGeometry/Triangle.cs
index d293f2af..2cb94a64 100644
--- a/源代码/StgSharp/Geometries/PlainGeometry/Triangle.cs
+++ b/源代码/StgSharp/Geometries/PlainGeometry/Triangle.cs
@@ -42,8 +42,6 @@ namespace StgSharp.Geometries
             this.vertex2 = new Point(vertexArray.vertex2Ptr);
             this.vertex3 = new Point(vertexArray.vertex3Ptr);
 
-            Console.WriteLine("vertex ok");
-            Console.WriteLine(ProgramTimeLine._currentPool);
             /**/
             ProgramTimeLine._currentPool.pointContainer.Add(vertex1);
             ProgramTimeLine._currentPool.pointContainer.Add(vertex2);
diff --git a/源代码/StgSharp/Logic/ContainerNode.cs b/源代码/StgSharp/Logic/ContainerNode.cs
index 8e0c1ebb..8749fe43 100644
--- a/源代码/StgSharp/Logic/ContainerNode.cs
+++ b/源代码/StgSharp/Logic/ContainerNode.cs
@@ -13,8 +13,10 @@ namespace StgSharp
         [NotNull]
         protected ContainerNode<T> _id;
 
-        [AllowNull]
-        internal ContainerNode<T> ID { get; }
+        internal ContainerNode<T> ID 
+        {
+            get { return _id; } 
+        }
 
         internal ContainerNode<T> Previous 
         {
diff --git a/源代码/StgSharp/Logic/LinkedList.cs b/源代码/StgSharp/Logic/LinkedList.cs
index 9a07ee61..a94cf6eb 100644
--- a/源代码/StgSharp/Logic/LinkedList.cs
+++ b/源代码/StgSharp/Logic/LinkedList.cs
@@ -17,10 +17,6 @@ namespace StgSharp
         {
             _heading = new ContainerNode<T>(null);
             isEmpty = true;
-
-#if DEBUG
-            Console.WriteLine("Linked list init ok");
-#endif
         }
 
         public T First
@@ -49,19 +45,12 @@ namespace StgSharp
                 t.Next = _heading;
                 t.Previous = _heading;
                 isEmpty = false;
-                Console.WriteLine("1st item ok");
-                Console.WriteLine(_heading._next);
-                Console.WriteLine(_heading._previous);
             }
             else
             {
-                Console.WriteLine("next begin");
                 t.Next = _heading;
-                Console.WriteLine("step 01 ok");
                 t.Previous = _heading.Previous;
-                Console.WriteLine("step 02 ok");
                 _heading._previous._next = t.ID;
-                Console.WriteLine("step 03 ok");
                 _heading._previous = t.ID;
                 
             }
diff --git a/源代码/StgSharp/bin/x64/Debug/netstandard2.1/StgSharp.dll b/源代码/StgSharp/bin/x64/Debug/netstandard2.1/StgSharp.dll
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diff --git a/源代码/StgSharpDebug/bin/x64/Debug/net6.0/StgSharp.dll b/源代码/StgSharpDebug/bin/x64/Debug/net6.0/StgSharp.dll
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