添加对象clone方法

__test__/FileSystem/file.test.ts

@@ -77,6 +77,22 @@ test('id分配', () =>
 });
 
 
+test('clone object', () =>
+{
+    let db = new Database();
+    let line = new Line();
+    db.ModelSpace.Append(line);
+    line.StartPoint = new Vector3(9, 9, 8);
+
+    CadObjectToString(line)/*?*/
+
+    let line2 = line.Clone();
+
+    CadObjectToString(line2) /*?*/
+});
+
+
+
 
 test('changev', () =>
 {

src/DatabaseServices/FileSystem.ts

@@ -242,6 +242,14 @@ export class CADObject
 
     //#endregion
 
+    //复制出一个实体,所有的关联引用全部失效,如有需要,请重新关联.
+    Clone(): CADObject
+    {
+        let file = new CADFile();
+        file.WriteObject(this);
+        return file.ReadObject(undefined);
+    }
+
     protected WriteObjectId(file: CADFile)
     {
         if (this.objectId)