文章标题

使用Revit API选取3D点

using System;
using System.Collections.Generic;
using System.Text;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.ApplicationServices;
using System.Linq;

namespace Pick3DPoint
{
[Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]

public class Command : IExternalCommand{    public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,        ref string message, Autodesk.Revit.DB.ElementSet elements)    {        UIApplication uiapp = commandData.Application;        UIDocument uidoc = uiapp.ActiveUIDocument;        Application app = uiapp.Application;        Document doc = uidoc.Document;        XYZ point_in_3d;        if (SetWorkPlaneAndPickObject(uidoc, out point_in_3d))        {            TaskDialog.Show("3D Point Selected",              "3D point picked on the plane"              + " defined by the selected face: "              + "X: " + point_in_3d.X.ToString()              + ", Y: " + point_in_3d.Y.ToString()              + ", Z: " + point_in_3d.Z.ToString());            return Result.Succeeded;        }        else        {            message = "3D point selection failed";            return Result.Failed;        }    }    /// <summary>    /// Return a 3D point. First, the user is prompted    /// to pick a face on an element. This defines a    /// work plane, on which a second point can be    /// picked.    /// </summary>    public bool SetWorkPlaneAndPickObject(                     UIDocument uidoc,                    out XYZ point_in_3d)    {        point_in_3d = null;        Document doc = uidoc.Document;        Reference r = uidoc.Selection.PickObject(          Autodesk.Revit.UI.Selection.ObjectType.Face,          "Please select a planar face to define work plane");        Element e = doc.GetElement(r.ElementId);        if (null != e)        {            PlanarFace face = e.GetGeometryObjectFromReference(r)              as PlanarFace;            GeometryElement geoEle = e.get_Geometry(new Options());            Transform transform = null;            foreach (GeometryObject gObj in geoEle)            {                GeometryInstance gInst = gObj as GeometryInstance;                if (null != gInst)                    transform = gInst.Transform;            }            if (face != null)            {                Plane plane = null;                if (null != transform)                {                    plane = new Plane(transform.OfVector(face.Normal),                      transform.OfPoint(face.Origin));                }                else                {                    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 = SketchPlane.Create(doc,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;    }}

}