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对三维多段线、未拟合的二维多段线还没处理，对园的剪切也不对
[C#] 纯文本查看 复制代码
[CommandMethod("MTRIM")]
public void m_Trim()
{
PromptEntityOptions m_peo = new PromptEntityOptions("\n请选择剪切边");
m_peo.SetRejectMessage(" It's not a Curve Obecjt!");
m_peo.AddAllowedClass(typeof(Curve), false);
PromptEntityResult m_per = m_ed.GetEntity(m_peo);
if (m_per.Status != PromptStatus.OK) return;
Point3d m_Pt1 = m_per.PickedPoint;
Point3d m_Pt2 = new Point3d();
if (!mFun.m_GetPoint("\n剪切方向", ref m_Pt2, m_Pt1, false, false)) return;
ObjectIdCollection m_OldObjIds = new ObjectIdCollection();//保存被剪前的实体ID
List m_NewEntArr = new List();
Entity m_OffsetEnt = null;//保存偏移实体
Point3dCollection m_JdPts = new Point3dCollection();//保存交点坐标
ObjectIdCollection m_DelObjIds = new ObjectIdCollection();//保存裁剪后的需要删除实体
using (Transaction m_tr = m_db.TransactionManager.StartTransaction())
{
Curve m_TrimEdgeEnt = (Curve)m_tr.GetObject(m_per.ObjectId, OpenMode.ForRead);//剪切边界实体
m_Pt1 = m_TrimEdgeEnt.GetClosestPointTo(m_Pt2, false);//曲线外一点距曲线最近的点
Vector3d m_Vect = m_TrimEdgeEnt.GetFirstDerivative(m_Pt1);//曲线上此点的切向量
double m_dOffset = 0.0001;//偏移量
if (mFun.m_PtSide(m_Pt1, m_Pt1.Add(m_Vect), m_Pt2) < 0) m_dOffset = -m_dOffset;
DBObjectCollection m_Objs = m_TrimEdgeEnt.GetOffsetCurves(m_dOffset);
foreach (DBObject obj in m_Objs) ;
Curve m_TrimEdgeEntOffset = (Curve)m_Objs[0];//得到剪切边偏移后的实体
m_OffsetEnt =(Curve) m_TrimEdgeEnt.Clone();
PromptSelectionResult m_psr = m_ed.SelectCrossingWindow(m_TrimEdgeEnt.GeomExtents.MinPoint, m_TrimEdgeEnt.GeomExtents.MaxPoint);//选择与剪切边包围的所有实体
foreach (ObjectId objid in m_psr.Value.GetObjectIds())
{
if (!objid.Equals(m_per.ObjectId))
{
Entity m_Ent = (Entity)m_tr.GetObject(objid, OpenMode.ForWrite);
//m_ed.WriteMessage("\nObject={0}", m_Ent.GetType().ToString());
if (m_Ent is Curve)//判断是否是曲线类实体
{
Curve m_Cur = (Curve)m_Ent;
Point3dCollection m_InterPts = m_GetInterPoints(m_Cur, m_TrimEdgeEnt);//求被剪曲线与剪切边的交点
if (m_InterPts.Count > 0)//判断曲线是否与剪切边相交
{
foreach (Point3d pt in m_InterPts) m_JdPts.Add(pt);
m_OldObjIds.Add(objid);//先保存这个曲线实体
m_ed.WriteMessage("");
try
{
m_Objs = m_Cur.GetSplitCurves(m_InterPts);//拆分曲线实体
foreach (Curve cur in m_Objs)
{
m_InterPts = m_GetInterPoints(cur, m_TrimEdgeEntOffset);
if (m_InterPts.Count == 0)//判断个实体是否与剪切边线的偏移线有交点
m_NewEntArr.Add(cur);
}
m_DelObjIds.Add(objid);
}
catch(System.Exception e)
{
m_ed.WriteMessage(" 错误:{0}", e.Message);
}
}
}
}
}
m_tr.Commit();
}
foreach (Entity ent in m_NewEntArr) mDraw.m_CreateEntity(ent);//生成实体（加入图形数据库）
foreach (ObjectId ObjId in m_DelObjIds) mDraw.m_EraseEntity(ObjId);//从数据库中删除实体
}
另外一个代码，使用TRIM命令
[C#] 纯文本查看 复制代码 private void TrimMap(Polyline cutBox)
{
//关闭对象捕捉功能避免误删除
Application.SetSystemVariable("SNAPMODE",0);
Application.SetSystemVariable("MODEMACRO", "正在修剪...");
//获取最小与最大点
Point3d minPoint = cutBox.GeometricExtents.MinPoint;
Point3d maxPoint = cutBox.GeometricExtents.MaxPoint;
//设置缩放视口
CommandLine.Command("Zoom", "W", new Point3d(minPoint.X - 10, minPoint.Y - 10, 0), new Point3d(maxPoint.X + 10, maxPoint.Y + 10, 0));
//裁剪精度
Polyline offsetBox = cutBox.GetOffsetCurves(0.2)[0] as Polyline;
if (offsetBox.Area < cutBox.Area)
{
offsetBox = cutBox.GetOffsetCurves(-0.2)[0] as Polyline;
}
//裁剪
for (int i = 0; i < offsetBox.NumberOfVertices;i++ )
{
Point3d p1 = offsetBox.GetPoint3dAt(i);
Point3d p2 = new Point3d();
if (i == offsetBox.NumberOfVertices-1)
{
p2 = offsetBox.GetPoint3dAt(0);
}
else
{
p2 = offsetBox.GetPoint3dAt(i + 1);
}
CommandLine.Command("TRIM", cutBox.ObjectId, "", "F", p1, p2, "", "");
}
offsetBox.Dispose();
Application.SetSystemVariable("MODEMACRO", "修剪完成...");
}
另外一个代码，，参考
[C#] 纯文本查看 复制代码 //改造成c#版本,不过offsetBox会引起错误，不知道怎么解决
public void TRimByCommandLine()
{
//关闭对象捕捉功能避免误删除
Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("SNAPMODE", 0);
Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("MODEMACRO", "正在修剪...");
Polyline cutBox;
Autodesk.AutoCAD.DatabaseServices.Database db = Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase;
PromptEntityResult per = ed.GetEntity("选择边线");
if (per.Status != PromptStatus.OK) return;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
cutBox = (Polyline)tr.GetObject(per.ObjectId, Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead);//剪切边界实体
tr.Dispose();
}
//获取最小与最大点
Point3d minPoint = cutBox.GeometricExtents.MinPoint;
Point3d maxPoint = cutBox.GeometricExtents.MaxPoint;
//设置缩放视口
acdDoc.SendCommand("Zoom\rW\r");
acdDoc.SendCommand((minPoint.X - 10).ToString() + "," + (minPoint.Y - 10).ToString() + "\r");
acdDoc.SendCommand((maxPoint.X + 10).ToString() + "," + (maxPoint.Y + 10).ToString() + "\r");
//裁剪精度
Polyline offsetBox = cutBox.GetOffsetCurves(0.2)[0] as Polyline;
if (offsetBox.Area < cutBox.Area)
{
offsetBox = cutBox.GetOffsetCurves(-0.2)[0] as Polyline;
}
Point3d[] p = new Point3d[offsetBox.NumberOfVertices];
for (int i = 0; i < offsetBox.NumberOfVertices; i++)
{
p[i]=new Point3d(offsetBox.GetPoint3dAt(i).X, offsetBox.GetPoint3dAt(i).Y, 0);
}
//裁剪
acdDoc.SendCommand("TRIM\r");
acdDoc.SendCommand(cutBox.ObjectId.ToString() + "\r\r");
for (int i = p.GetLowerBound(0); i <= p.GetUpperBound(0); i++)
{
Point3d p1 = p[i];
Point3d p2 = new Point3d();
if (i == p.GetUpperBound(0))
{
p2 = p[0];
}
else
{
p2 = p[i + 1];
}
acdDoc.SendCommand("f\r");
acdDoc.SendCommand(p1.X.ToString()+","+p1.Y.ToString() + "\r");
acdDoc.SendCommand(p2.X.ToString()+","+p2.Y.ToString() + "\r\r");
}
acdDoc.SendCommand("\r");
Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("MODEMACRO", "修剪完成...");
} | 
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发表于 2017-6-3 10:00:04
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