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  • Revit API选择三维视图上一点

    start
    [TransactionAttribute(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    public class cmdPickPointIn3d : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string messages, ElementSet elements)
        {
            UIApplication app = commandData.Application;
            Document doc = app.ActiveUIDocument.Document;

            XYZ point_in_3d;

            if (PickFaceSetWorkPlaneAndPickPoint( app.ActiveUIDocument, out point_in_3d))
            {
                TaskDialog.Show("3D Point Selected",
                    "3D point picked on the plane"
                    + " defined by the selected face: "
                    + PointString(point_in_3d));

                return Result.Succeeded;
            }
            else
            {
                messages = "3D point selection failed";
                return Result.Failed;
            }

            return Result.Succeeded;
        }
        string PointString(XYZ p)
        {
            return string.Format("({0},{1},{2})",
                RealString(p.X),
                RealString(p.Y),
                RealString(p.Z));
        }
        string PointString(UV p)
        {
            return string.Format("({0},{1})",
                RealString(p.U),
                RealString(p.V));
        }
        string RealString(double a)
        {
            return a.ToString("0.##");
        }
        bool PickFaceSetWorkPlaneAndPickPoint(UIDocument uidoc, out XYZ point_in_3d)
        {
            point_in_3d = null;

            Document doc = uidoc.Document;

            Reference r = uidoc.Selection.PickObject(
                ObjectType.Face,
                "Please select a planar face to define work plane");

            Element e = doc.get_Element(r.ElementId);

            if (null != e)
            {
                PlanarFace face
                    = e.GetGeometryObjectFromReference(r)
                    as PlanarFace;

                if (face != null)
                {
                    Plane plane = new Plane(
                        face.Normal, face.Origin);

                    Transaction t = new Transaction(doc);

                    t.Start("Temporarily set work plane"
                        + " to pick point in 3D");

                    SketchPlane sp = doc.Create.NewSketchPlane(
                        plane);

                    uidoc.ActiveView.SketchPlane = sp;
                    uidoc.ActiveView.ShowActiveWorkPlane();

                    try
                    {
                        point_in_3d = uidoc.Selection.PickPoint(
                            "Please pick a point on the plane"
                            + " defined by the selected face");
                    }
                    catch (OperationCanceledException)
                    {
                    }

                    t.RollBack();
                }
            }
            return null != point_in_3d;
        }
    }
    url:http://greatverve.cnblogs.com/p/pick-a-point-in-3d.html
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  • 原文地址:https://www.cnblogs.com/greatverve/p/pick-a-point-in-3d.html
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