1. 单行文字的添加

第一步： 首先在CAD中新增中文样式
输入ST命令：

第二步：代码开发

 /// <summary>
        /// 添加文本信息
        /// </summary>
        [CommandMethod("AddText")]
        public void AddText()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var docDatabase = doc.Database;
            using (var trans = docDatabase.TransactionManager.StartTransaction())
            {
                //打开块表
                TextStyleTable textStyleTable = (TextStyleTable)trans.GetObject(docDatabase.TextStyleTableId, OpenMode.ForRead);
                var objectId = textStyleTable["chinese"];
                DBText text = new DBText
                {
                    TextString = "wuk测试添加单行文本",
                    //文本坐标
                    Position   = new Point3d(500,500,0),
                    Height = 500,
                    //宽度因子
                    WidthFactor = 0.8,
                    TextStyleId = objectId
                };
                docDatabase.AddEnityToModelSpace(text);
                trans.Commit();
            }
        }

效果如下：

2. 修改和克隆图形

 /// <summary>
        /// 添加文本信息
        /// </summary>
        [CommandMethod("EditEntity")]
        public void EditEntity()
        {
            
            var doc = Application.DocumentManager.MdiActiveDocument;
            var docDatabase = doc.Database;
            var selectEntity = Selected.selectEntities()[0];
            if (selectEntity is Circle)
            {
                using (var trans = docDatabase.TransactionManager.StartTransaction())
                {
                    //修改对象
                    Circle circle = (Circle)selectEntity.ObjectId.GetObject(OpenMode.ForWrite);
                    circle.Radius = 600;
                    circle.Color = Color.FromRgb(255, 0, 0);
                    trans.Commit();
                }  
            }

            // 克隆对象，原对象不变
            if (selectEntity is Circle myCircle)
            {
                var circle = myCircle.Clone() as Circle;
                if (circle != null)
                {
                    circle.Radius = 500;
                    circle.Color = Color.FromRgb(255, 0, 0);
                    //修改坐标
                    circle.Center = new Point3d(100, 100, 100);
                    docDatabase.AddEnityToModelSpace(circle);
                }
            }
        }

图示结果：

3. 图形形变

/// <summary>
        /// 图形形变
        /// </summary>
        [CommandMethod("EditEntityTest")]
        public void EditEntityTest()
        {
            
            var doc = Application.DocumentManager.MdiActiveDocument;
            var docDatabase = doc.Database;
            var selectEntity = Selected.selectEntities()[0];
            using (var trans = docDatabase.TransactionManager.StartTransaction())
            {
                //修改对象
                Entity  entity = (Entity)selectEntity.ObjectId.GetObject(OpenMode.ForWrite);
                Matrix3d matrix3d;
                //平移
                // matrix3d = Matrix3d.Displacement(new Vector3d(200,200,0));
                // entity.TransformBy(matrix3d);
                
                // //旋转 参数1：旋转角度 2：旋转轴心(负则反方向顺时针) 3：旋转中心
                // matrix3d = Matrix3d.Rotation(Math.PI/6,Vector3d.ZAxis,Point3d.Origin);
                
                // //缩放 参数1：缩放比例 2：缩放中心
                // matrix3d = Matrix3d.Scaling(2,new Point3d(50,50,0));
                // 镜像 两种方式
                matrix3d = Matrix3d.Mirroring(new Plane(Point3d.Origin,new Point3d(0,1,0),new Point3d(0,0,1)));
                matrix3d = Matrix3d.Mirroring(new Line3d(Point3d.Origin, new Point3d(0, 1, 0)));
                entity.TransformBy(matrix3d);
                trans.Commit();
            } 
            
        }

旋转

4. 块参照

/// <summary>
        /// 图形形变
        /// </summary>
        [CommandMethod("EditEntityTest1")]
        public void EditEntityTest1()
        {
            
            var doc = Application.DocumentManager.MdiActiveDocument;
            var docDatabase = doc.Database;
            var block = Selected.selectEntities()[0];
            if (block is BlockReference blockReference)
            {
                using (var trans = docDatabase.TransactionManager.StartTransaction())
                {
                    // String name = blockReference.BlockName;
                    // var ro = blockReference.Rotation;
                    // var factors = blockReference.ScaleFactors;
                    // var position = blockReference.Position;
                    
                    //修改块参照数据
                    BlockReference blockR = (BlockReference)block.ObjectId.GetObject(OpenMode.ForWrite);
                    blockR.Rotation = Math.PI / 6;
                    blockR.ScaleFactors = new Scale3d(2, 2, 2);
                    
                    trans.Commit();
                } 
            }
            
            
        }