使用C#模仿AutoCAD的视图立方体行为

Question

我有一个对象，我从我的程序中在AutoCAD中绘制。在对象被绘制后，我设置相机以便它缩放到从俯视图望向墙壁的位置。然后我想让它向前视图旋转45度并向左视图旋转45度。这本质上模仿了在AutoCAD中选择对象然后单击视图立方体的操作。

这是我的轨道方法。

/// <summary>
/// Orbit the angle around a passed axis
/// </summary>
public static void Orbit(Vector3d axis, Point3d pivotPoint, Angle angle)
{
    Editor activeEditor = AcadApp.DocumentManager.MdiActiveDocument.Editor; //Get editor for current document
    ViewTableRecord activeView = activeEditor.GetCurrentView(); //Get current view table
    activeView.ViewDirection = activeView.ViewDirection.TransformBy(Matrix3d.Rotation(angle.Radians, axis, pivotPoint)); //Adjust the ViewTableRecord
    activeEditor.SetCurrentView(activeView); //Set it as the current view
}

这是我调用轨道方法的方式

CameraMethods.Orbit(Vector3d.XAxis, GeometryAdapter.ClearspanPointToAcadPoint(wallToZoomTo.FrontLine.MidPoint), new Angle(AngleType.Radian, Math.PI / 4));
CameraMethods.Orbit(Vector3d.ZAxis, GeometryAdapter.ClearspanPointToAcadPoint(wallToZoomTo.FrontLine.MidPoint), new Angle(AngleType.Radian, Math.PI / 4));

问题在于当我传递墙对象的中点时，它会绕摄像机轨道运动，以至于它非常远（在视图的左上部分）。

有人知道如何通过C＃轻松地围绕AutoCAD中选择的对象进行旋转吗？谢谢！

- Nick Gilbert

Answer 1

试试这个：

[CommandMethod("MYORBIT")]
public void MyOrbit()
{
  Document doc = Application.DocumentManager.MdiActiveDocument;
  Database db = doc.Database;
  Editor ed = doc.Editor;

  PromptPointResult ppr = ed.GetPoint("\nSelect orbit point: ");
  if (ppr.Status == PromptStatus.Cancel) return;

  using (Transaction tr = db.TransactionManager.StartTransaction())
  {
    short cvport = (short)Application.GetSystemVariable("CVPORT");
    using (Manager gm = doc.GraphicsManager)
    using (var kd = new KernelDescriptor())
    {
      kd.addRequirement(Autodesk.AutoCAD.UniqueString.Intern("3D Drawing"));
      using (View view = gm.ObtainAcGsView(cvport, kd))
      {
        double d = view.Position.DistanceTo(view.Target);
        view.SetView(ppr.Value + new Vector3d(-1, -1, 1).GetNormal() * d,
          ppr.Value, Vector3d.ZAxis, view.FieldWidth, view.FieldHeight);
        gm.SetViewportFromView(cvport, view, true, true, true);
      }
    }

    // Needed if wireframe 2D
    ed.Regen();

    tr.Commit();
  }
}

- Maxence

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太棒了！非常感谢。 - Nick Gilbert