尝试C#将CAD二维多段线转为三维管线样式

最近每天学CAD，今天试着体验下三维，略有小成给大家分享一下,把CAD二维的多段线转为三维的，想对于管线类应该很实用。

效果图如下：

[CommandMethod("solid3d")]
public void Solid3d()
{
#region 选择二维管线创建三维模型

PromptSelectionOptions m_selectionOption = new PromptSelectionOptions();
SelectionSet m_selectionSet = pDocument.Editor.GetSelection(m_selectionOption).Value;
List<Solid3d> solid3dCollection = new List<Solid3d>();
using (DocumentLock docLock = pDocument.LockDocument())
{
using (Transaction tran = pDatabase.TransactionManager.StartTransaction())
{
foreach (ObjectId m_objectid in m_selectionSet.GetObjectIds())
{
Entity pEntity = (Entity)tran.GetObject(m_objectid, OpenMode.ForRead);

if ((Polyline)pEntity != null)
{
Polyline m_polyline = pEntity as Polyline;
foreach (Solid3d m_solid3d in CreateSolid(m_polyline, 10, 4))
{
solid3dCollection.Add(m_solid3d);
}
}
}
}
}

#endregion

#region 复制到3维视图
if (solid3dCollection.Count > 0)
{
Document m_document = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.Add(@"C:\Documents and Settings\Administrator\Local Settings\Application Data\Autodesk\AutoCAD 2007\R17.0\chs\Template\acad3D.dwt");

Database m_database = m_document.Database;

//锁定文档
using (DocumentLock docLock = m_document.LockDocument())
{
using (Transaction tran = m_database.TransactionManager.StartTransaction())
{
BlockTable m_blockTable = (BlockTable)tran.GetObject(m_database.BlockTableId, OpenMode.ForRead);
BlockTableRecord m_blockTableRecord = (BlockTableRecord)tran.GetObject(m_blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite);

foreach (Solid3d m_solid3d in solid3dCollection)
{
m_blockTableRecord.AppendEntity(m_solid3d);
tran.AddNewlyCreatedDBObject(m_solid3d, true);
}
tran.Commit();
}
m_document.SendStringToExecute("_zoom _a", true, false, false);
Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument = m_document;
}
}
#endregion
}

/// <summary>
/// 根据二维管线创建三维模型
/// </summary>
/// <param name="m_polyline">二维管线</param>
/// <param name="r">内管径</param>
/// <param name="h">管壁厚度</param>
/// <returns>三维管线模型的集合</returns>
public List<Solid3d> CreateSolid(Polyline m_polyline, double r, double h)
{
List<Solid3d> solid3dCollection = new List<Autodesk.AutoCAD.DatabaseServices.Solid3d>();//保存3d模型实体

for (int i = 0; i < m_polyline.NumberOfVertices-1; i++)
{
#region 创建三维管线剖面

double disx = Math.Pow((m_polyline.GetPoint2dAt(i + 1).X - m_polyline.GetPoint2dAt(i).X), 2);
double disy = Math.Pow((m_polyline.GetPoint2dAt(i + 1).Y - m_polyline.GetPoint2dAt(i).Y), 2);
double length = Math.Sqrt(disx+disy);//计算实际管长

Polyline polyline = new Polyline();//存放管线剖面结构
polyline.AddVertexAt(0, new Point2d(m_polyline.GetPoint2dAt(i).X, m_polyline.GetPoint2dAt(i).Y), 0, 0, 0);
polyline.AddVertexAt(1, new Point2d(m_polyline.GetPoint2dAt(i).X + length, m_polyline.GetPoint2dAt(i).Y), 0, 0, 0);
polyline.AddVertexAt(2, new Point2d(m_polyline.GetPoint2dAt(i).X + length, m_polyline.GetPoint2dAt(i).Y + h), 0, 0, 0);
polyline.AddVertexAt(3, new Point2d(m_polyline.GetPoint2dAt(i).X, m_polyline.GetPoint2dAt(i).Y + h), 0, 0, 0);
polyline.Closed = true;

DBObjectCollection n_DBObjectCollection = new DBObjectCollection();
n_DBObjectCollection.Add(polyline);
DBObjectCollection m_DBObjectCollection = Region.CreateFromCurves(n_DBObjectCollection);
Region m_Region = m_DBObjectCollection[0] as Region;

#endregion

#region 创建三维实体

Solid3d m_solid3d = new Solid3d();
Point3d point3d = new Point3d(polyline.GetPoint3dAt(0).X, polyline.GetPoint3dAt(0).Y - r,0);
m_solid3d.Revolve(m_Region, point3d, Vector3d.XAxis, 6.28);

#endregion

#region 拐角

double angle=Math.Atan2(m_polyline.GetPoint2dAt(i+1).Y-m_polyline.GetPoint2dAt(i).Y,m_polyline.GetPoint2dAt(i+1).X-m_polyline.GetPoint2dAt(i).X);
if (angle != 0)
{
//平面旋转
Matrix3d m_Matrix3d = pDocument.Editor.CurrentUserCoordinateSystem;
CoordinateSystem3d m_CoordinateSystem3d = m_Matrix3d.CoordinateSystem3d;
m_solid3d.TransformBy(Matrix3d.Rotation(angle, Vector3d.ZAxis, m_polyline.GetPoint3dAt(i)));
}

#endregion

#region 高程

double highValue = 10;//这个是假定的每一次拐点高程都增加10，如果每个点高程不一样的情况可以使用highValue=H2-H1，（当前点高程-前一点高程）
double highAngle = Math.Asin(highValue / length);
if (highAngle != 0)
{
//高程旋转
Matrix3d m_Matrix3d = pDocument.Editor.CurrentUserCoordinateSystem;
CoordinateSystem3d m_CoordinateSystem3d = m_Matrix3d.CoordinateSystem3d;
m_solid3d.TransformBy(Matrix3d.Rotation(-highAngle, Vector3d.YAxis, m_polyline.GetPoint3dAt(i)));

//高程平移
Vector3d m_Vector3d = m_polyline.GetPoint3dAt(i).GetVectorTo(new Point3d(m_polyline.GetPoint3dAt(i).X, m_polyline.GetPoint3dAt(i).Y, m_polyline.GetPoint3dAt(i).Z + highValue * i));
m_solid3d.TransformBy(Matrix3d.Displacement(m_Vector3d));
}

#endregion

solid3dCollection.Add(m_solid3d);
}
return solid3dCollection;
}

#endregion