revit二次开发（拾取面，并创建面周围的模型线）
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.Attributes;
namespace 拾取图元的面
{
[Transaction(TransactionMode.Manual)]
public class Class1 : IExternalCommand
{
public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIDocument uidoc = commandData.Application.ActiveUIDocument;
Document doc = uidoc.Document;//获取活动文档
//选取面并画出面的四根线，重难点就在于transform
//1，利于reference获取面的主体元素
//2，并利用元素实例获取transform
//3，然后利用transform.ofpoint和transform.ofvector转换成项目内坐标
Reference refer = uidoc.Selection.PickObject(ObjectType.Face);
Element e = doc.GetElement(refer.ElementId);//第一步获取参照元素，通过elementid转换为
Transform transform = null;
PlanarFace face = e.GetGeometryObjectFromReference(refer) as PlanarFace;
if (e != null)//获取transform
{
GeometryElement geoEle = e.get_Geometry(new Options());
foreach (GeometryObject gObj in geoEle)
{
GeometryInstance gInst = gObj as GeometryInstance;
if (null != gInst)
{
transform = gInst.Transform;
}
}
}
Transaction trans = new Transaction(doc);
FaceNewModelLine(doc, face, transform);
return Result.Succeeded;
}
private void FaceNewModelLine(Document RevitDoc, PlanarFace face, Transform trans)
//根据PlanarFace创建平面模型线
{
foreach (EdgeArray e in face.EdgeLoops)
{
foreach (Edge e2 in e)
{
if (e2.AsCurve() is Line)
{
Line line = (e2.AsCurve()) as Line;//因为怕存在Arc曲线无法转换
Plane plane = null;
if (trans != null)//转换坐标
{
plane = Plane.CreateByNormalAndOrigin(trans.OfVector(face.FaceNormal), trans.OfPoint(face.Origin));
XYZ xyz1 = line.GetEndPoint(0);
XYZ xyz2 = line.GetEndPoint(1);
line = Line.CreateBound(trans.OfPoint(xyz1), trans.OfPoint(xyz2));
}
else
{
plane = Plane.CreateByNormalAndOrigin(face.FaceNormal, face.Origin);
}
using (Transaction transaction = new Transaction(RevitDoc))
{
transaction.Start("Create Model Line");
//创建sketchPlane
SketchPlane modelSketch = SketchPlane.Create(RevitDoc, plane); //创建模型线
RevitDoc.Create.NewModelCurve(line, modelSketch);
transaction.Commit();
}
}
}
}
}
}
}