get connected lines

sanjaymann · ‎03-31-2014

Hi,

How do I get all lines connected to a selected line. The lines can cross other lines ,they can share same start or end point or they can share common vertices. In all I mean to say that I want all lines connected/touching/intersecting lines to the selected line.

Thanks & Regards

Sanjay Pandey

cdinten · ‎03-31-2014

Entity.IntersectWith Method, Line is also a class derives from this abstract class

Hallex · ‎03-31-2014

Change this code to your needs:

      //_____________________________________________________________________//
        //ads_queueexpr
        [DllImport("accore.dll", CharSet = CharSet.Unicode,
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "ads_queueexpr")]
        extern static private int ads_queueexpr(byte[] command);


        [CommandMethod("tJL", CommandFlags.Modal | CommandFlags.UsePickSet)]
        public void TestConnectedLines()
        {
            Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;

            Editor ed = doc.Editor;

            Database db = doc.Database;

            PromptEntityOptions pso = new PromptEntityOptions("\nPick a single line to join: ");

            pso.SetRejectMessage("\nObject must be of type Line!");

            pso.AddAllowedClass(typeof(Line), false);

            PromptEntityResult res = ed.GetEntity(pso);

            if (res.Status != PromptStatus.OK) return;
            using (DocumentLock doclock = doc.LockDocument())
            {
                using (Transaction tr = db.TransactionManager.StartTransaction())
                {

                   Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable( "PICKFIRST",1); 
               Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable( "PEDITACCEPT",0); 
                    BlockTableRecord btr = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForRead) as BlockTableRecord;

                    List<ObjectId> ids = JoinLines(btr, res.ObjectId);

                    ObjectId[] lines = ids.ToArray();
                    
                    ed.SetImpliedSelection(lines);
                 
                    PromptSelectionResult chres = ed.SelectImplied();
              
                    if (chres.Status != PromptStatus.OK)
                    {
                        ed.WriteMessage("\nNothing added in the chain!");

                        return;
                    }
                        else
                        {
                        ed.WriteMessage(chres.Value.Count.ToString());
                        }
                    SelectionSet newset = SelectionSet.FromObjectIds(lines);

                    ed.SetImpliedSelection(newset);
           
                    string handles = "";
                    foreach (SelectedObject selobj in newset)
                    {
                        
                        Entity subent = tr.GetObject(selobj.ObjectId, OpenMode.ForWrite) as Entity;
                        string hdl=string.Format("(handent \"{0}\")",subent.Handle.ToString());
                        handles= handles + hdl + " ";
                  
                    }
                    System.Text.UnicodeEncoding uEncode = new System.Text.UnicodeEncoding();
                 // if PEDITACCEPT is set to 1 enshort the command avoiding "_Y" argument:
                    ads_queueexpr(uEncode.GetBytes("(COMMAND \"_.PEDIT\" \"_M\"" + handles  +  "\"\"" +  "\"_Y\" \"_J\" \"\" \"\")"));

                    tr.Commit();
                }
            }
        }

        private void SelectConnectedLines(BlockTableRecord btr, List<ObjectId> ids, ObjectId id)
        {
            Entity en = id.GetObject(OpenMode.ForRead, false) as Entity;

            Line ln = en as Line;

            if (ln != null)

                foreach (ObjectId idx in btr)
                {
                    Entity ex = idx.GetObject(OpenMode.ForRead, false) as Entity;

                    Line lx = ex as Line;

                    if (((ln.StartPoint == lx.StartPoint) || (ln.StartPoint == lx.EndPoint)) ||

                        ((ln.EndPoint == lx.StartPoint) || (ln.EndPoint == lx.EndPoint)))

                        if (!ids.Contains(idx))
                        {
                            ids.Add(idx);

                            SelectConnectedLines(btr, ids, idx);
                        }
                }
        }

        public List<ObjectId> JoinLines(BlockTableRecord btr, ObjectId id)
        {
            List<ObjectId> ids = new List<ObjectId>();

            SelectConnectedLines(btr, ids, id);

            return ids;
        }

        //_____________________________________________________________________//

_____________________________________
C6309D9E0751D165D0934D0621DFF27919

BKSpurgeon · ‎04-16-2015

There is a built in autcad command called "FS" - fast selection or fast selection (can't remember which).

it selects lines which are connected to your main line.

If you switch FSMODE to "ON" you can also have all subsidiary lines selected if they are in any way connected to your main base line.

it's in the autocad 2015 version.

BKSpurgeon · ‎04-20-2015

List<ObjectId> ids = JoinLines(btr, res.ObjectId);

for some reason, I cannot declare the List collection (see above) in Visual studio - intellisense is not coming up with that option.

any ideas?

hgasty1001 · ‎04-20-2015

Hi,

Try importing: System.Collections.Generic Namespace into the class you are coding.

Gaston Nunez

BKSpurgeon · ‎04-20-2015

excellent thank you!

for everyone's reference, also found that in addition to that, these two need to be added too:

using System.Collections.Generic;
using System.Runtime.InteropServices;

rgds

BK

BKSpurgeon · ‎04-20-2015

// if PEDITACCEPT is set to 1 enshort the command avoiding "_Y" argument:
                    ads_queueexpr(uEncode.GetBytes("(COMMAND \"_.PEDIT\" \"_M\"" + handles  +  "\"\"" +  "\"_Y\" \"_J\" \"\" \"\")"));

what is the purpose of the above here?

When I sent to the ojbectarx reference guide to see what ads_queueexpr means i was meant with confusion:

ads_queueexpr Function
This function queues up the LISP expression expr to be executed the next time AutoCAD is quiescent and able to evaluate LISP expressions. This function should only be called from within the kLoadDwgMsg case in your acrxEntryPoint() function. Queued LISP expressions will be executed after the (s::startup) has been executed. Multiple calls to ads_queueexpr() from the kLoadDwgMsg callback are perfectly acceptable. They get queued up in the order of the calls. ads_queueexpr Function
Do not use ads_queueexpr() in any context other then the kLoadDwgMsg case of acrxEntryPoint(). To do so will have unpredictable results, and may even be damaging, because the queue may not be looked at until active AutoLISP evaluations, MENU items, and/or SCRIPT executions are all finished.

I do not understand much of the above.

any explanation was to what ads_queueexpr(uEncode.GetBytes("(COMMAND \"_.PEDIT\" \"_M\"" + handles + "\"\"" + "\"_Y\" \"_J\" \"\" \"\")")); does would be helpful.
since pedit is set to 0 the "\"_Y\" is omitted in my code leaving behind this: ads_queueexpr(uEncode.GetBytes("(COMMAND \"_.PEDIT\" \"_M\"" + handles + "\"\"" + " \"_J\" \"\" \"\")"));

Am i doing this right? Any assistance much appreciated.

BKSpurgeon · ‎07-30-2017

For anyone reading this perhaps you can make use of the following routine Mr Gilles has kindly provided:

https://www.theswamp.org/index.php?action=post;quote=446965;topic=31865.15;last_msg=565479

it seems to work very quickly - incredibly quickly compared to the algorithm posted above. You will also need the GeometryExtensions Library also kindly provided by Mr Gilles.

good luck.