public static ObjectId OpenOrCreateUserCoordinateSystem(string ucsName, bool openIfExists = true)
{
using (Transaction trans = Tools.StartTransaction())
{
// Open the UCS table for read
UcsTable ucsTable = (UcsTable)trans.GetObject(Tools.GetAcadDatabase().UcsTableId, OpenMode.ForRead);
UcsTableRecord ucsTblRec;
// Check to see if the "New_UCS" UCS table record exists
if (ucsTable.Has(ucsName) == false)
{
ucsTblRec = new UcsTableRecord();
ucsTblRec.Name = ucsName;
// Open the UCSTable for write
ucsTable.UpgradeOpen();
// Add the new UCS table record
ucsTable.Add(ucsTblRec);
trans.AddNewlyCreatedDBObject(ucsTblRec, true);
ucsTblRec.Dispose();
}
else
{
if (openIfExists)
{
ucsTblRec = trans.GetObject(ucsTable[ucsName],
OpenMode.ForWrite) as UcsTableRecord;
}
else
{
throw new ArgumentException(string.Format("\nA UCS with this name \"{0}\" alredy exists", ucsName));
}
}
return(ucsTblRec.Id);
}
}
/// <summary>
/// Create a new UCS, make it active, and translate the coordinates of a point into the UCS coordinates
/// https://knowledge.autodesk.com/search-result/caas/CloudHelp/cloudhelp/2017/ENU/AutoCAD-NET/files/GUID-096085E3-5AD5-4454-BF10-C9177FDB5979-htm.html
/// </summary>
public static void NewUCS()
{
// Get the current document and database, and start a transaction
Document acDoc = Application.DocumentManager.MdiActiveDocument;
Database acCurDb = acDoc.Database;
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
// Open the UCS table for read
UcsTable acUCSTbl;
acUCSTbl = acTrans.GetObject(acCurDb.UcsTableId,
OpenMode.ForRead) as UcsTable;
UcsTableRecord acUCSTblRec;
// Check to see if the "New_UCS" UCS table record exists
if (acUCSTbl.Has("New_UCS") == false)
{
acUCSTblRec = new UcsTableRecord();
acUCSTblRec.Name = "New_UCS";
// Open the UCSTable for write
acUCSTbl.UpgradeOpen();
// Add the new UCS table record
acUCSTbl.Add(acUCSTblRec);
acTrans.AddNewlyCreatedDBObject(acUCSTblRec, true);
acUCSTblRec.Dispose();
}
else
{
acUCSTblRec = acTrans.GetObject(acUCSTbl["New_UCS"],
OpenMode.ForWrite) as UcsTableRecord;
}
acUCSTblRec.Origin = new Point3d(4, 5, 3);
acUCSTblRec.XAxis = new Vector3d(1, 0, 0);
acUCSTblRec.YAxis = new Vector3d(0, 1, 0);
// Open the active viewport
ViewportTableRecord acVportTblRec;
acVportTblRec = acTrans.GetObject(acDoc.Editor.ActiveViewportId,
OpenMode.ForWrite) as ViewportTableRecord;
// Display the UCS Icon at the origin of the current viewport
acVportTblRec.IconAtOrigin = true;
acVportTblRec.IconEnabled = true;
// Set the UCS current
acVportTblRec.SetUcs(acUCSTblRec.ObjectId);
acDoc.Editor.UpdateTiledViewportsFromDatabase();
// Display the name of the current UCS
UcsTableRecord acUCSTblRecActive;
acUCSTblRecActive = acTrans.GetObject(acVportTblRec.UcsName,
OpenMode.ForRead) as UcsTableRecord;
Application.ShowAlertDialog("The current UCS is: " +
acUCSTblRecActive.Name);
PromptPointResult pPtRes;
PromptPointOptions pPtOpts = new PromptPointOptions("");
// Prompt for a point
pPtOpts.Message = "\nEnter a point: ";
pPtRes = acDoc.Editor.GetPoint(pPtOpts);
Point3d pPt3dWCS;
Point3d pPt3dUCS;
// If a point was entered, then translate it to the current UCS
if (pPtRes.Status == PromptStatus.OK)
{
pPt3dWCS = pPtRes.Value;
pPt3dUCS = pPtRes.Value;
// Translate the point from the current UCS to the WCS
Matrix3d newMatrix = new Matrix3d();
newMatrix = Matrix3d.AlignCoordinateSystem(Point3d.Origin,
Vector3d.XAxis,
Vector3d.YAxis,
Vector3d.ZAxis,
acVportTblRec.Ucs.Origin,
acVportTblRec.Ucs.Xaxis,
acVportTblRec.Ucs.Yaxis,
acVportTblRec.Ucs.Zaxis);
pPt3dWCS = pPt3dWCS.TransformBy(newMatrix);
Application.ShowAlertDialog("The WCS coordinates are: \n" +
pPt3dWCS.ToString() + "\n" +
"The UCS coordinates are: \n" +
pPt3dUCS.ToString());
}
// Save the new objects to the database
acTrans.Commit();
}
}