如何快速选择与一条多段线相交的线?我想选择出某一图层中与一条多段线相交的多段线或二维多段线,该怎么写选择条件呢?我现在的方法是：Databasedb=HostApplicationServices.WorkingDatabase;Editor

Question

如何快速选择与一条多段线相交的线?
我想选择出某一图层中与一条多段线相交的多段线或二维多段线,该怎么写选择条件呢? 我现在的方法是： Database db = HostApplicationServices.WorkingDatabase; Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; TypedValue value1 = new TypedValue((int)DxfCode.Start, "*PolyLine"); TypedValue value2 = new TypedValue((int)DxfCode.LayerName, Layername); TypedValue[] values = { value1, value2 }; SelectionFilter sfilter = new SelectionFilter(values); PromptSelectionResult resSel = ed.SelectAll(sfilter); SelectionSet sSet = resSel.Value; ObjectId[] ids = sSet.GetObjectIds(); Polyline polylineTemp = new Polyline(2); polylineTemp.AddVertexAt(0, p1, 0, 0, 0); polylineTemp.AddVertexAt(1, p2, 0, 0, 0); using (Transaction trans = db.TransactionManager.StartTransaction()) { foreach(ObjectId sSetEntId in ids) { Entity myEntity = (Entity)trans.GetObject(sSetEntId, OpenMode.ForRead); if ((myEntity is Polyline) || (myEntity is Polyline2d)) { //这里做myEntity 与polylineTemp 是否有交点的判断 } } trans.commit(); }

Answer 1

Database db = HostApplicationServices.WorkingDatabase; Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; Entity entity = null; DBObjectCollection dbCollection = new DBObjectCollection(); TypedValue [] type=new TypedValue[2]; type[0] = new TypedValue((int)DxfCode.Start, "*PolyLine"); type[1] = new TypedValue((int)DxfCode.LayerName, layerName); // 表示得到所有与多边形相交的对象,并且该对象所在layerName层的曲线 PromptSelectionResult ents = ed.SelectFence(pts,filter); //pts要相交的多段线的合 if (ents.Status == PromptStatus.OK) { SelectionSet ss = ents.Value; using (Transaction tran = db.TransactionManager.StartOpenCloseTransaction()) { foreach (ObjectId id in ss.GetObjectIds()) { entity = tran.GetObject(id, OpenMode.ForWrite, true) as Entity; if (entity != null) { dbCollection.Add(entity); //得到的对象放入集合中 } tran.Commit(); } } }希望能帮到你. 查看原帖>>