AutoCad 二次開發 .net 之層表的增長 刪除 修改圖層顏色 遍歷 設置當前層

AutoCad 二次開發 .net 之層表的增長 刪除 修改圖層顏色 遍歷 設置當前層

AutoCad 二次開發 .net 之層表的增長 刪除 修改圖層顏色 遍歷 設置當前層
我理解的圖層的做用大概是把相同做用的功能彙集在一塊兒，以便好選擇。好比，把一副圖塊中的全部標註定義爲一個圖層，把編號定義爲一個圖層，把相同的塊參照定義爲一個圖層。圖層表的操做和塊表的操做相似。

在這裏我就分享一下本身從書《AUTOCAD VBA&VB.NET開發基礎與實例教程(C#版) 第2版》學習到的關於圖層的一些操做的代碼，我以爲主要是圖層的刪除須要注意一下。

 

使用的成員變量：

Document Doc = Application.DocumentManager.MdiActiveDocument;
Editor Ed = Application.DocumentManager.MdiActiveDocument.Editor;
Database Db = Application.DocumentManager.MdiActiveDocument.Database;

1、圖層的刪除 代碼：

        /// <summary>
        /// 圖層0和圖層Defpoints不能被刪除，當前圖層不能被刪除，圖層上有塊參照，實體時不能被刪除
        /// 刪除前需刷新，使用LayerTableRecord.GenerateUsageData();
        /// </summary>
        public bool DeleteLayer(Database db, string layerName)
        {

            using (var trans = db.TransactionManager.StartTransaction())
            {

                var lyTbl = trans.GetObject(db.LayerTableId, OpenMode.ForWrite) as LayerTable;

                if (!lyTbl.Has(layerName)) return false;

                if (layerName == "0" || layerName == "Defpoints") return false;

                ObjectId oId = lyTbl[layerName];

                if (oId == db.Clayer) return false;

                var lyTblRec = trans.GetObject(lyTbl[layerName], OpenMode.ForRead) as LayerTableRecord;

                lyTbl.GenerateUsageData();

                if (lyTblRec.IsUsed) return false;

                lyTblRec.UpgradeOpen();

                lyTblRec.Erase(true);

                trans.Commit();

                return true;
            }
        }

2、圖層的增長：

public ObjectId AddLayer(Database db, string layerName)
        {
            ObjectId oId = ObjectId.Null;

            using (var trans = db.TransactionManager.StartTransaction())
            {
                var lyerTbl = db.LayerTableId.GetObject(OpenMode.ForWrite) as LayerTable;

                if (lyerTbl.Has(layerName))
                {
                    trans.Commit();
                    return lyerTbl[layerName];
                }
                var lyerTblRec = new LayerTableRecord();
                lyerTblRec.Name = layerName;

                lyerTbl.Add(lyerTblRec);
                trans.AddNewlyCreatedDBObject(lyerTblRec, true);

                lyerTbl.DowngradeOpen();

                trans.Commit();

                return lyerTbl[layerName];
            }
        }

3、修改圖層顏色：

 public bool SetLayerColor(Database db, string layerName, short colorIndexs)
        {

            using (var trans = db.TransactionManager.StartTransaction())
            {

                var lyTbl = db.LayerTableId.GetObject(OpenMode.ForRead) as LayerTable;

                if (lyTbl.Has(layerName))
                {
                    var lyTblRec = trans.GetObject(lyTbl[layerName], OpenMode.ForWrite) as LayerTableRecord;

                    if (colorIndexs < 0 || colorIndexs > 255)
                    {
                        colorIndexs = 1;
                    }
                    lyTblRec.Color = Color.FromColorIndex(ColorMethod.ByAci, colorIndexs);

                    lyTblRec.DowngradeOpen();

                    trans.Commit();
                    return true;

                }
                else
                {
                    return false;
                }
            }
        }

4、遍歷圖層：

public List<LayerTableRecord> GetAllLayer(Database db)
        {
            List<LayerTableRecord> listLyTblRec = new List<LayerTableRecord>();

            using (var trans = db.TransactionManager.StartTransaction())
            {

                var lyTbl = trans.GetObject(db.LayerTableId, OpenMode.ForRead) as LayerTable;

                foreach (ObjectId oId in lyTbl)
                {

                    var lyTblRec = trans.GetObject(oId, OpenMode.ForRead) as LayerTableRecord;

                    listLyTblRec.Add(lyTblRec);

                }

                return listLyTblRec;
            }
        }

5、設置當前圖層：

Databse.Clayer表示當前圖層
  public bool SetCurrentLayer(Database db, string layerName)
        {

            using (var trans = db.TransactionManager.StartTransaction())
            {

                var lyTbl = trans.GetObject(db.LayerTableId, OpenMode.ForRead) as LayerTable;

                if (!lyTbl.Has(layerName)) return false;

                //var lyTblRec = trans.GetObject(lyTbl[layerName], OpenMode.ForRead) as LayerTableRecord;

                if (db.Clayer != lyTbl[layerName])
                {
                    db.Clayer = lyTbl[layerName];
                }
                return true;
            }

        }

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