文章标题

用Revit APT选取3D点

//Picking 3D points using Revit APIusing 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;        }    }}