topic Re: How to trim the culve outside the polyline? in .NET Forum

How to trim the culve outside the polyline?

swaywood — Sat, 20 Jan 2018 09:44:04 GMT

Hi:

I want to imitate the trim command and trim all the curlve outside a closed polyline or a circle.

I found the exactly lisp function but i want to finish it by c#.net, the following is the lisp code and gif pictrue.

https://autocadtips1.com/2012/03/14/trim-and-delete-outside-of-closed-polyline/

best wishes

swaywood

Re: How to trim the culve outside the polyline?

ActivistInvestor — Sat, 20 Jan 2018 14:21:07 GMT

@swaywood wrote:
Hi:
I want to imitate the trim command and trim all the curlve outside a closed polyline or a circle.
I found the exactly lisp function but i want to finish it by c#.net, the following is the lisp code and gif pictrue.
https://autocadtips1.com/2012/03/14/trim-and-delete-outside-of-closed-polyline/

best wishes
swaywood

Give this a try:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;

/// This code requires a reference to AcExportLayoutEx.dll:
using Autodesk.AutoCAD.ExportLayout;


namespace ClipExample
{
   public static class ClipExampleCommands
   {
      static ObjectId GetClipBoundary(Editor ed)
      {
         var peo = new PromptEntityOptions("\nSelect boundary curve: ");
         peo.SetRejectMessage("\nRequires a closed, planar curve");
         peo.AddAllowedClass(typeof(Curve), false);
         peo.AllowObjectOnLockedLayer = true;
         peo.AllowNone = true;
         var per = ed.GetEntity(peo);
         if(per.Status != PromptStatus.OK)
            return ObjectId.Null;
         using(var tr = new OpenCloseTransaction())
         {
            try
            {
               Curve curve = (Curve) tr.GetObject(per.ObjectId, OpenMode.ForRead);
               if(!(curve.Closed && curve.IsPlanar))
               {
                  ed.WriteMessage("\nInvalid selection, requires a closed, planar curve.");
                  return ObjectId.Null;
               }
               return per.ObjectId;
            }
            finally
            {
               tr.Commit();
            }
         }
      }

      static SelectionSet GetObjectsToClip(Editor ed)
      {
         PromptSelectionOptions pso = new PromptSelectionOptions();
         pso.RejectObjectsFromNonCurrentSpace = true;
         pso.RejectObjectsOnLockedLayers = true;
         var filter = new SelectionFilter(
            new[] { new TypedValue(0, "LINE,ARC,CIRCLE,SPLINE,LWPOLYLINE,ELLIPSE") });
         var psr = ed.GetSelection(pso, filter);
         return psr.Status == PromptStatus.OK ? psr.Value : null;
      }

      [CommandMethod("CLIPOBJECTS")]
      public static void ClipObjectsCommand2()
      {
         Document doc = Application.DocumentManager.MdiActiveDocument;
         Editor ed = doc.Editor;
         Database db = doc.Database;
         ObjectId boundaryId = GetClipBoundary(ed);
         if(boundaryId.IsNull)
            return;
         SelectionSet selection = GetObjectsToClip(ed);
         if(selection == null)
            return;
         try
         {
            using(Transaction tr = doc.TransactionManager.StartTransaction())
            {
               Curve boundary = (Curve) tr.GetObject(boundaryId, OpenMode.ForRead);
               var btr = (BlockTableRecord) tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
               foreach(ObjectId id in selection.GetObjectIds())
               {
                  if(id != boundaryId)
                  {
                     using(Trimmer trimmer = new Autodesk.AutoCAD.ExportLayout.Trimmer())
                     {
                        Entity entityToTrim = (Entity) tr.GetObject(id, OpenMode.ForWrite);
                        trimmer.Trim(entityToTrim, boundary);
                        if(trimmer.HasAccurateResults)
                        {
                           foreach(Entity ent in trimmer.TrimResultObjects)
                           {
                              ent.SetPropertiesFrom(entityToTrim);
                              btr.AppendEntity(ent);
                              tr.AddNewlyCreatedDBObject(ent, true);
                           }
                           if(trimmer.EntityCompletelyOutside || trimmer.EntityOnBoundary)
                              entityToTrim.Erase();
                        }
                     }
                  }
               }
               tr.Commit();
            }
         }
         catch(System.Exception ex)
         {
            ed.WriteMessage("\nOperation failed ({0})", ex.Message);
         }
      }
   }
}

Re: How to trim the culve outside the polyline?

_gile — Sat, 20 Jan 2018 18:45:32 GMT

@ActivistInvestor Very nice !

Thanks to make me discover this API.

Re: How to trim the culve outside the polyline?

ActivistInvestor — Sat, 20 Jan 2018 20:01:52 GMT

@_gile wrote:
@ActivistInvestor Very nice !
Thanks to make me discover this API.

Thanks @_gile.

Don't forget that as you discovered not long ago, closed, 'heavy', spline-fit polylines will blow up GetSplitCurves() which the Trimmer class uses, so it shouldn't be used on them.

Re: How to trim the culve outside the polyline?

_gile — Sat, 20 Jan 2018 20:06:33 GMT

Thank you for reminding this too.

Re: How to trim the culve outside the polyline?

swaywood — Mon, 22 Jan 2018 08:26:12 GMT

@ActivistInvestor @_gile

thanks for your help.

It would be better if the trimer supports hatch entity.

Re: How to trim the culve outside the polyline?

ActivistInvestor — Mon, 22 Jan 2018 14:36:31 GMT

@swaywood wrote:
@ActivistInvestor @_gile

thanks for your help.
It would be better if the trimer supports hatch entity.
.

The trimmer doesn't support blocks or hatching. That's supported by EXPORTLAYOUT but it happens at a higher-level in the code, which is more complicated to use because not all of the classes involved are public.

You can write code that explodes the hatching (and block insertions if you need that), and the trimmer will clip the exploded objects. The objects that are to be clipped do not have to be in a database.

Re: How to trim the culve outside the polyline?

Anonymous — Wed, 11 Dec 2019 01:28:23 GMT

I have the same problem ,thanks

Re: How to trim the culve outside the polyline?

Anonymous — Wed, 11 Dec 2019 01:30:09 GMT

you are a nice man ,thanks

Re: How to trim the culve outside the polyline?

Anonymous — Wed, 11 Dec 2019 23:53:03 GMT

😀hi, Great! I want to ask more, I have read this post: https://autocadtips1.com/2012/03/08/autolisp-trim-objects-on-one-side/
and I tried using the following code but why it didn't work? if typeof TrimEnt is Line then it'll work but it isn't working with Pline,Spline

Dim pick As ResultBuffer = New ResultBuffer()
                        pick.Add(New TypedValue(CShort(LispDataType.ListBegin)))
                        pick.Add(New TypedValue(CShort(LispDataType.ObjectId), TrimEntID))
                        pick.Add(New TypedValue(CShort(LispDataType.Point3d), Pickpt))
                        pick.Add(New TypedValue(CShort(LispDataType.ListEnd)))
   ed.Command("trim", boundset, "", pick, "")

Thanks a lot.

Re: How to trim the culve outside the polyline?

Anonymous — Fri, 14 Aug 2020 08:08:15 GMT

what code must to edit if trim only in inside rectangle
i was try change this if (!trimmer.EntityOnBoundary) but not sucsess

Re: How to trim the culve outside the polyline?

Anonymous — Wed, 14 Jul 2021 16:08:13 GMT

Hi! I'm trying to use the trimmer function in AutoCAD 2021, however I can't find any reference to "Autodesk.AutoCAD.ExportLayout" or AcExportLayoutEx.dll in the documentation. Do you know where I can find info on using these functionalities? Thanks 🙂
Tyler

Re: How to trim the culve outside the polyline?

_gile — Wed, 14 Jul 2021 16:44:43 GMT

Hi,

You should find it in the AutoCAD installation folder (default: C:\Program Files\Autodesk\AutoCAD 20XX).

Re: How to trim the culve outside the polyline?

kiruba — Mon, 18 Jul 2022 13:50:35 GMT

I had the same requirement, but with a hatch as output. but this helps

Re: How to trim the culve outside the polyline?

kiruba — Mon, 18 Jul 2022 13:49:41 GMT

This is amazing. i was searching this for implementing custom shape hatch. Although the result is not a hatch, i can live with it. thanks again

Re: How to trim the culve outside the polyline?

kiruba — Thu, 11 Aug 2022 14:49:22 GMT

This works perfectly. however, i need to clip with nested boundaries. For this i need to clip the entities inside trim boundary. i am unable to achieve this. is there a solution?

Re: How to trim the culve outside the polyline?

Activist_Investor — Thu, 25 Aug 2022 22:53:03 GMT

Well, you could certainly modify the code I posted to perform the inverse operation (remove objects or portions thereof that are within the trim boundary rather than outside of it) and use that modified code with the nested boundary. The original code was never designed to trim against a region with inner loops.