/// <summary>
/// 创建一个新的UCS
/// </summary>
/// <param name="db">数据库对象</param>
/// <param name="UCSName">要创建的UCS名称</param>
/// <returns>返回创建的UCS的Id</returns>
public static ObjectId AddUCS(this Database db, string UCSName)
{
var trans = db.TransactionManager;
//打开UCS表
UcsTable ut = (UcsTable)trans.GetObject(db.UcsTableId, OpenMode.ForRead);
if (!ut.Has(UCSName))//如果不存在名为UCSName的UCS，则新建一个UCS
{
//定义一个新的UCS
UcsTableRecord utr = new UcsTableRecord();
utr.Name = UCSName; //设置UCS名
ut.UpgradeOpen(); //切换UCS表的状态为写以添加新的UCS
//将UCS的信息添加到UCS表中
ut.Add(utr);
//把UCS添加到事务处理中
trans.AddNewlyCreatedDBObject(utr, true);
ut.DowngradeOpen(); //为了安全，将UCS表的状态切换为读
}
return(ut[UCSName]); //返回新添加的UCS的ObjectId
}
public void Test()
{
Document document = Application.DocumentManager.MdiActiveDocument;
Editor ed = document.Editor;
Matrix3d mt = ed.CurrentUserCoordinateSystem;
Point3d basePt = new Point3d(1000, 1000, 0);
Vector3d vecX = new Vector3d(100, 100, 0);
Vector3d vecY = vecX.GetPerpendicularVector();
using (Transaction trans = document.TransactionManager.StartTransaction())
{
UcsTable ut = trans.GetObject(document.Database.UcsTableId, OpenMode.ForRead) as UcsTable;
UcsTableRecord utr = new UcsTableRecord();
utr.Name = "TestUcs";
utr.Origin = basePt;
utr.XAxis = vecX;
utr.XAxis = vecY;
ut.UpgradeOpen();
ut.Add(utr);
ut.DowngradeOpen();
trans.AddNewlyCreatedDBObject(utr, true);
trans.Commit();
}
}