AutoCad 二次开发 .net 之层表的增加 删除 修改图层颜色 遍历 设置当前层
AutoCad 二次开发 .net 之层表的增加 删除 修改图层颜色 遍历 设置当前层
我理解的图层的作用大概是把相同作用的功能聚集在一起，以便好选择。比如，把一副图块中的所有标注定义为一个图层，把编号定义为一个图层，把相同的块参照定义为一个图层。图层表的操作和块表的操作类似。
在这里我就分享一下自己从书《AUTOCAD VBA&VB.NET开发基础与实例教程(C#版) 第2版》学习到的关于图层的一些操作的代码，我觉得主要是图层的删除需要注意一下。
使用的成员变量：
Document Doc = Application.DocumentManager.MdiActiveDocument;
Editor Ed = Application.DocumentManager.MdiActiveDocument.Editor;
Database Db = Application.DocumentManager.MdiActiveDocument.Database;
一、图层的删除 代码：
/// <summary>
/// 图层0和图层Defpoints不能被删除，当前图层不能被删除，图层上有块参照，实体时不能被删除
/// 删除前需刷新，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 == "" || 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;
}
}
二、图层的增加：
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];
}
}
三、修改图层颜色：
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 < || colorIndexs > )
{
colorIndexs = ;
}
lyTblRec.Color = Color.FromColorIndex(ColorMethod.ByAci, colorIndexs); lyTblRec.DowngradeOpen(); trans.Commit();
return true; }
else
{
return false;
}
}
}
四、遍历图层：
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;
}
}
五、设置当前图层：
Databse.Clayer表示当前图层
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;
} }
六、冻结图层：
[CommandMethod("ECDLayerHide")]
public void HiddenSelectLayer()
{
var propSel = new PromptSelectionOptions();
var propRes = Ed.GetSelection(propSel);
if (propRes.Status != PromptStatus.OK)
{
return;
}
ObjectId[] oIds = propRes.Value.GetObjectIds();
using(var trans = Db.TransactionManager.StartTransaction())
{
var lyTbl = trans.GetObject(Db.LayerTableId, OpenMode.ForRead) as LayerTable;
var blkTbl = trans.GetObject(Db.BlockTableId, OpenMode.ForRead) as BlockTable;
for (int i = ; i < oIds.Length; i++)
{
var ent = trans.GetObject(oIds[i], OpenMode.ForRead) as Entity;
var layerId = ent.LayerId;
var lyTblRec = trans.GetObject(layerId, OpenMode.ForWrite) as LayerTableRecord;
if (lyTblRec.Name == "") { return; }
lyTblRec.IsFrozen = true;
lyTblRec.IsHidden = true;
}
trans.Commit();
}
}