/// <summary>
/// Gets the transformation matrix from the paper space active viewport Display Coordinate System (DCS)
/// to the Paper space Display Coordinate System (PSDCS).
/// </summary>
/// <param name="ed">The instance to which this method applies.</param>
/// <returns>The DCS to PSDCS transformation matrix.</returns>
/// <exception cref=" Autodesk.AutoCAD.Runtime.Exception">
/// eNotInPaperSpace is thrown if this method is called form Model Space.</exception>
/// <exception cref=" Autodesk.AutoCAD.Runtime.Exception">
/// eCannotChangeActiveViewport is thrown if there is none floating viewport in the current layout.</exception>
public static Matrix3d DCS2PSDCS(this Editor ed)
{
Database db = ed.Document.Database;
if (db.TileMode)
{
throw new AcRx.Exception(AcRx.ErrorStatus.NotInPaperspace);
}
using (Transaction tr = db.TransactionManager.StartTransaction())
{
Viewport vp =
(Viewport)tr.GetObject(ed.CurrentViewportObjectId, OpenMode.ForRead);
if (vp.Number == 1)
{
try
{
ed.SwitchToModelSpace();
vp = (Viewport)tr.GetObject(ed.CurrentViewportObjectId, OpenMode.ForRead);
ed.SwitchToPaperSpace();
}
catch
{
throw new AcRx.Exception(AcRx.ErrorStatus.CannotChangeActiveViewport);
}
}
return(vp.DCS2PSDCS());
}
}
/// <summary>
/// Gets the transformation matrix from the Paper Space Display Coordinate System (PSDCS)
/// to the specified paper space viewport Display Coordinate System (DCS).
/// </summary>
/// <param name="vp">The instance to which this method applies.</param>
/// <returns>The PSDCS to DCS transformation matrix.</returns>
public static Matrix3d PSDCS2DCS(this Viewport vp)
{
return(vp.DCS2PSDCS().Inverse());
}