如果你想用另一种方式来做：从模型空间到纸上空间，这里是我提出的一个小测试项目。我希望它能帮助别人
关键位有以下几种方法：
Matrix3d m = ed.WCS2DCS();
Matrix3d m2 = ed.DCS2PSDCS();
首先我们需要从WCS到DCS，然后从DCS到PSDC。它们是使用Gilles几何扩展库中提供的方便扩展方法完成的。我会将它们粘贴在这里，以便于您参考-但请务必获取原件及其相关注释：
public static Matrix3d WCS2DCS(this Editor ed)
{
return ed.DCS2WCS().Inverse();
}
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();
}
}
说明：打开CAD文件。下载DLL。考虑到视口UCS的定义不同，应在图纸空间中在模型空间中拾取的几何图形上绘制圆
public static void ViewPortTest()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
BlockTableRecord ms = tr.GetObject(bt, OpenMode.ForWrite) as BlockTableRecord;
Line line = new Line();
line.StartPoint = new Point3d(3167, 448, 0);
line.EndPoint = new Point3d(3167, 594, 0);
ms.AppendEntity(line);
tr.AddNewlyCreatedDBObject(line, true);
tr.Commit();
}
using (Transaction tr = db.TransactionManager.StartTransaction())
{
BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
BlockTableRecord ms = tr.GetObject(bt, OpenMode.ForWrite) as BlockTableRecord;
RXClass rxLine = RXClass.GetClass(typeof(Line));
Line line =ms.Cast().Where(id => id.ObjectClass == rxLine).Select(id => tr.GetObject(id, OpenMode.ForRead) as Line).First();
Point3d startPoint = line.StartPoint;
Point3d endPoint = line.EndPoint;
//// When working with paper space
/// PSDCS to DCS
/// DCS to WCS
Matrix3d m = ed.WCS2DCS();
Matrix3d m2 = ed.DCS2PSDCS();
Point3d newStart = startPoint.TransformBy(m).TransformBy(m2);
Point3d newEnd = endPoint.TransformBy(m).TransformBy(m2);
ed.SwitchToPaperSpace();
BlockTableRecord ps = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
using (Circle circle = new Circle(newStart, Vector3d.ZAxis, 20))
{
ps.AppendEntity(circle);
tr.AddNewlyCreatedDBObject(circle, true);
}
using (Circle circle = new Circle(newEnd, Vector3d.ZAxis, 20))
{
ps.AppendEntity(circle);
tr.AddNewlyCreatedDBObject(circle, true);
}
tr.Commit();
}
}
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