Revit读取cad的文字信息需要借助Teigha的开源dll，在程序中添加下图中红色框的dll文件的引用，其他的dll文件全部放在同一个文件夹中即可，运行的时候，会自动把这些dll文件全部复制到bin文件当中，同时，在Revit中运行插件，Revit也会自动加载这些dll文件。
以下是关键方法，在Revit里读取cad文字信息，图层信息，几何信息等。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using CreatBridgeForRevit2018.ElementsSelect;
using CreatBridgeForRevit2018.Filter;
using Teigha.Runtime;
using Teigha.DatabaseServices;
using System.IO;
using System.Collections;
using Teigha.Geometry;
namespace CreatBridgeForRevit2018.ReadCAD
{
class ReadCADUtils
{
/// <summary>
/// 取得链接cad的路径
/// </summary>
/// <param name="cadLinkTypeID"></param>
/// <param name="revitDoc"></param>
/// <returns></returns>
public string GetCADPath(ElementId cadLinkTypeID,Document revitDoc)
{
CADLinkType cadLinkType = revitDoc.GetElement(cadLinkTypeID) as CADLinkType;
return ModelPathUtils.ConvertModelPathToUserVisiblePath(cadLinkType.GetExternalFileReference().GetAbsolutePath());
}
/// <summary>
/// 取得CAD的文字信息
/// </summary>
/// <param name="dwgFile"></param>
/// <returns></returns>
public List<CADTextModel> GetCADTextInfo(string dwgFile)
{
List<CADTextModel> listCADModels = new List<CADTextModel>();
using (new Services())
{
using (Database database = new Database(false, false))
{
database.ReadDwgFile(dwgFile, FileShare.Read, true, "");
using (var trans = database.TransactionManager.StartTransaction())
{
using (BlockTable table = (BlockTable)database.BlockTableId.GetObject(OpenMode.ForRead))
{
using (SymbolTableEnumerator enumerator = table.GetEnumerator())
{
StringBuilder sb = new StringBuilder();
while (enumerator.MoveNext())
{
using (BlockTableRecord record = (BlockTableRecord)enumerator.Current.GetObject(OpenMode.ForRead))
{
foreach (ObjectId id in record)
{
Entity entity = (Entity)id.GetObject(OpenMode.ForRead, false, false);
CADTextModel model = new CADTextModel();
switch (entity.GetRXClass().Name)
{
case "AcDbText":
Teigha.DatabaseServices.DBText text = (Teigha.DatabaseServices.DBText)entity;
model.Location = ConverCADPointToRevitPoint(text.Position);
model.Text = text.TextString;
model.Angel = text.Rotation;
model.Layer = text.Layer;
listCADModels.Add(model);
break;
case "AcDbMText":
Teigha.DatabaseServices.MText mText = (Teigha.DatabaseServices.MText)entity;
model.Location = ConverCADPointToRevitPoint(mText.Location);
model.Text = mText.Text;
model.Angel = mText.Rotation;
model.Layer = mText.Layer;
listCADModels.Add(model);
break;
}
}
}
}
}
}
}
}
}
return listCADModels;
}
/// <summary>
/// 取得cad的图层名称
/// </summary>
/// <param name="dwgFile"></param>
/// <returns></returns>
public IList<string> GetLayerName(string dwgFile)
{
IList<string> cadLayerNames = new List<string>();
using (new Services())
{
using (Database database = new Database(false, false))
{
database.ReadDwgFile(dwgFile, FileShare.Read, true, "");
using (var trans = database.TransactionManager.StartTransaction())
{
using (LayerTable lt = (LayerTable)trans.GetObject(database.LayerTableId, OpenMode.ForRead))
{
foreach (ObjectId id in lt)
{
LayerTableRecord ltr = (LayerTableRecord)trans.GetObject(id, OpenMode.ForRead);
cadLayerNames.Add(ltr.Name);
}
}
trans.Commit();
}
}
}
return cadLayerNames;
}
/// <summary>
/// 取得CAD里的线，包括直线、多段线、圆曲线
/// </summary>
/// <param name="dwgFile"></param>
/// <returns></returns>
public List<CADGeometryModel> GetCADCurves(string dwgFile)
{
List<CADGeometryModel> listCADModels = new List<CADGeometryModel>();
using (new Services())
{
using (Database database = new Database(false, false))
{
database.ReadDwgFile(dwgFile, FileShare.Read, true, "");
using (var trans = database.TransactionManager.StartTransaction())
{
using (BlockTable table = (BlockTable)database.BlockTableId.GetObject(OpenMode.ForRead))
{
using (SymbolTableEnumerator enumerator = table.GetEnumerator())
{
StringBuilder sb = new StringBuilder();
while (enumerator.MoveNext())
{
using (BlockTableRecord record = (BlockTableRecord)enumerator.Current.GetObject(OpenMode.ForRead))
{
foreach (ObjectId id in record)
{
Entity entity = (Entity)id.GetObject(OpenMode.ForRead, false, false);
CADGeometryModel geoModel = new CADGeometryModel();
switch (entity.GetRXClass().Name)
{
case "AcDbPolyline":
Teigha.DatabaseServices.Polyline pl = (Teigha.DatabaseServices.Polyline)entity;
IList<XYZ> listPoints = new List<XYZ>();
for (int i = 0; i < pl.NumberOfVertices; i++)
{
listPoints.Add(new XYZ(MillimetersToUnits(pl.GetPoint2dAt(i).X), MillimetersToUnits(pl.GetPoint2dAt(i).Y), 0));
}
PolyLine polyLine = PolyLine.Create(listPoints);
listCADModels.Add(new CADGeometryModel() {CadPolyLine= polyLine,LayerName=pl.Layer });
break;
case "AcDbLine":
Teigha.DatabaseServices.Line line = (Teigha.DatabaseServices.Line)entity;
Autodesk.Revit.DB.Line revitLine = Autodesk.Revit.DB.Line.CreateBound(ConverCADPointToRevitPoint(line.StartPoint), ConverCADPointToRevitPoint(line.EndPoint));
listCADModels.Add(new CADGeometryModel() {CadCurve=revitLine as Autodesk.Revit.DB.Curve ,LayerName=line.Layer});
break;
case "AcDbArc":
Teigha.DatabaseServices.Arc arc = (Teigha.DatabaseServices.Arc)entity;
double enda, stara;
if (arc.StartAngle> arc.EndAngle)
{
enda = arc.StartAngle;
stara = arc.EndAngle;
}
else
{
enda = arc.EndAngle;
stara = arc.StartAngle;
}
Autodesk.Revit.DB.Arc revitArc = Autodesk.Revit.DB.Arc.Create(Autodesk.Revit.DB.Plane.CreateByNormalAndOrigin(new XYZ( arc.Normal.X, arc.Normal.Y, arc.Normal.Z),
ConverCADPointToRevitPoint(arc.Center)), MillimetersToUnits(arc.Radius), stara, enda);
listCADModels.Add(new CADGeometryModel() { CadCurve = revitArc as Autodesk.Revit.DB.Curve, LayerName = arc.Layer });
break;
default:
break;
}
}
}
}
}
}
}
}
}
return listCADModels;
}
/// <summary>
/// 毫米转化成英寸
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
private double MillimetersToUnits(double value)
{
return UnitUtils.ConvertToInternalUnits(value, DisplayUnitType.DUT_MILLIMETERS);
}
/// <summary>
/// 将CAD里的点转化为Revit里的点
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
private XYZ ConverCADPointToRevitPoint(Point3d point)
{
return new XYZ(MillimetersToUnits(point.X), MillimetersToUnits(point.Y), MillimetersToUnits(point.Z));
}
}
}
需要额外引用一些dll文件。其中红色框框里的dll文件是需要加载进vs引用里的。其余的放在debug文件夹里。
结果如下，可以在Revit中正确读取cad的图层信息，文字位置，几何信息等：
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