首次提交：本地项目同步到Gitea

LibShapes/Core/Command/ShapeCommand.cs

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+using Io.Github.Kerwinxu.LibShapes.Core.Shape;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Io.Github.Kerwinxu.LibShapes.Core.Command
+{
+    /// <summary>
+    /// 形状方面的命令。
+    /// </summary>
+    public  abstract class ShapeCommand: ICommand
+    {
+        /// <summary>
+        /// 原先的形状
+        /// </summary>
+        public ShapeEle OldShape { get; set; }
+
+        /// <summary>
+        /// 新的形状
+        /// </summary>
+        public ShapeEle NewShape { get; set; }
+
+        /// <summary>
+        /// 画布
+        /// </summary>
+        public UserControlCanvas canvas { get; set; }
+
+        // 如下是两个操作。
+
+        public virtual void Undo() { this.canvas.shapes.replaceShape(this.OldShape.ID, this.NewShape); }
+
+        public virtual void Redo() { this.canvas.shapes.replaceShape(this.OldShape.ID, this.OldShape); }
+    }
+}