c#读DWG文件中Model_Space的数据

一，读取DWG文件中的对象坐标信息，比如‘等高线’，遇到代理实体则炸开处理

资料下载：点击这里

二、一言不合就直接上代码

using gis.@base.GisBase;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Teigha.DatabaseServices;
using Teigha.Geometry;
using Teigha.Runtime;

namespace Skyline.app.DWG2SKModel
{
class DWGReader
{
Database mDB = null;
Dictionary<string, List<ObjectId>> mLyrObjDic;
Dictionary<ObjectId, Entity> mEntityDic;

//间隔阈值,arc另外考虑一下
double LineParamValue = 5;//对矢量线按照一定间隔打断，这是作者自己的需求，读者按照自己需求进行获取坐标信息

Teigha.Runtime.Services mRServices;
public DWGReader()
{
mRServices = new Teigha.Runtime.Services();
}

/// <summary>
/// 图层以及图层中的对象在EntityDic中的key
/// </summary>
public Dictionary<string, List<ObjectId>> LyrObjDic
{
get
{
return mLyrObjDic;
}
}

public Dictionary<ObjectId, Entity> EntityDic
{
get
{
return mEntityDic;
}
}

public void Open(string pDWGFilePath)
{
if (pDWGFilePath == string.Empty) return;
if (!File.Exists(pDWGFilePath)) return;
mDB = new Database(false, false);
mDB.ReadDwgFile(pDWGFilePath, FileOpenMode.OpenForReadAndAllShare, false, "");
OpenLayer();
OpenModel();
}

private void OpenLayer()
{
mLyrObjDic = new Dictionary<string, List<ObjectId>>();
TransactionManager pTMgr = mDB.TransactionManager;
using (Transaction pTransac = pTMgr.StartTransaction())
{
LayerTable pLTable = pTMgr.GetObject(mDB.LayerTableId, OpenMode.ForRead) as LayerTable;
IEnumerator pIterator = pLTable.GetEnumerator();
while (pIterator.MoveNext())
{
ObjectId objId = (ObjectId)pIterator.Current;
LayerTableRecord pLTRecord = pTMgr.GetObject(objId, OpenMode.ForRead) as LayerTableRecord;
mLyrObjDic.Add(pLTRecord.Name, new List<ObjectId>());
}
pTransac.Commit();
}
}

private void OpenModel()
{
mEntityDic = new Dictionary<ObjectId, Entity>();
TransactionManager pTMgr = mDB.TransactionManager;
using (Transaction pTransac = pTMgr.StartTransaction())
{
BlockTable pBTable = pTMgr.GetObject(mDB.BlockTableId, OpenMode.ForRead) as BlockTable;
ObjectId pModelSpaceId = pBTable[BlockTableRecord.ModelSpace];
//pModelSpaceId.GetObject(OpenMode.ForRead);
BlockTableRecord pBTRecord = pTMgr.GetObject(pModelSpaceId, OpenMode.ForRead) as BlockTableRecord;
IEnumerator pIterator = pBTRecord.GetEnumerator();

while (pIterator.MoveNext())
{
ObjectId objId = (ObjectId)pIterator.Current;
Entity pEntity = pTMgr.GetObject(objId, OpenMode.ForRead) as Entity;
//if (!mLyrObjDic.ContainsKey(pEntity.Layer)) continue;
mEntityDic.Add(objId, pEntity);
mLyrObjDic[pEntity.Layer].Add(objId);//按照图层名进行组织
}
pTransac.Commit();
}
}

public List<string> GetLayersName()
{
return mLyrObjDic.Keys.ToList();
}

/// <summary>
/// 各种类型的间隔取值阈值需要指定
/// </summary>
/// <param name="ObjId"></param>
/// <returns></returns>
public Point3DFList GetObjCoords(ObjectId ObjId)
{
Entity pEntity = mEntityDic[ObjId];
Point3DFList result = new Point3DFList();//该数据结构是作者自己设计的数据结构，读者可以换做其他数据结构
Point3DFList pList;
DBObjectCollection dbObjColl = new DBObjectCollection();
switch (pEntity.GetRXClass().Name.ToLower())
{
//弧线与直线、样条曲线的阈值计算不同，单独考虑一下
case "acdbarc":
case "acdbcircle":
case "acdbline":
case "acdbspline":
pList = GetArcCoords(pEntity as Curve, LineParamValue);
result.AddRange(pList);
break;

#region Need Explode Entity
case "acdbpolyline":
break;
case "acdbhatch":
break;
case "acdbblockreference":
break;
case "acdbrotateddimension":
break;
case "acdbproxyentity":
pList = GetProxyEntityCoords(pEntity as ProxyEntity);
result.AddRange(pList);
break;
#endregion
}
return result;
}

private Point3DFList GetProxyEntityCoords(ProxyEntity pProxyEntity)
{
Point3DFList result = new Point3DFList();

DBObjectCollection dbObjColl = new DBObjectCollection();
try
{
pProxyEntity.Explode(dbObjColl);//炸开代理实体
}
catch (System.Exception)
{
return result;
}
//pProxyEntity.BlockId as BlockTableRecord;

foreach (DBObject dbObj in dbObjColl)
{
switch (dbObj.GetRXClass().Name.ToLower())
{

//炸开之后还有acdbpolyline类型
case "acdbcircle":
case "acdbline":
case "acdbspline":
case "acdbarc":
result.AddRange(GetArcCoords(dbObj as Curve, LineParamValue));
break;
case "acdbpolyline":
result.AddRange(GetPolylineCoords(dbObj as Entity, LineParamValue));
break;
case "acdbproxyentity":
result.AddRange(GetProxyEntityCoords(dbObj as ProxyEntity));
break;
}
}
return result;
}

#region 获取简单实体的坐标
private Point3DFList GetArcCoords(Curve curve, double ParamSpace)
{
Point3DFList result = new Point3DFList();
if (curve.StartParam == curve.EndParam) return result;
Point3DF pPt3DF = new Point3DF();
double splineStartParam = curve.StartParam;
do
{
Point3d pt3d = curve.GetPointAtParameter(splineStartParam);
result.Add(new Point3DF(pt3d.Y, pt3d.X, pt3d.Z));
splineStartParam += ParamSpace;
} while (splineStartParam <= curve.EndParam);
return result;
}

#endregion
private Point3DFList GetPolylineCoords(Entity pEntity, double ParamSpace)
{
bool isc = mEntityDic.Keys.Contains(pEntity.Id);
Teigha.DatabaseServices.Polyline poly = pEntity as Teigha.DatabaseServices.Polyline;
Point3DFList result = new Point3DFList();
DBObjectCollection dbObjColl = new DBObjectCollection();
try
{
poly.Explode(dbObjColl);//炸开代理实体
}
catch (System.Exception)
{
return result;
}

foreach (DBObject dbObj in dbObjColl)
{
bool iscon = mEntityDic.Keys.Contains(dbObj.Id);
//查看炸开后的实体是否还属于原图层
switch (dbObj.GetRXClass().Name.ToLower())
{
//炸开之后还有acdbpolyline类型
case "acdbcircle":
case "acdbline":
case "acdbspline":
case "acdbarc":
result.AddRange(GetArcCoords(dbObj as Curve, LineParamValue));
break;
case "acdbpolyline":
result.AddRange(GetPolylineCoords(dbObj as Entity, ParamSpace));
break;
}
}
return result;
}
}
}