How to make two polylines eachother.

[MarkJamesRogolino]

Hello, everyone. Now I have to make two polylines (these are separated each other) touch.Is there a way to implement this process

[kerry_w_brown]

@MarkJamesRogolino 

The partial code you posted is of no use to me for resolving your issue.

At first glance it seems adequate. 

What is the difference between the moved location and your expected location ?

I did test the original version of IsPointOnPolyline ( similar to the one you used )

// (C) CodeHimBelonga: kdub 2023/03/03
//
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Runtime.CompilerServices;

//using Kdub.Common;
using AcadApp = Autodesk.AutoCAD.ApplicationServices.Core.Application;

[assembly: CommandClass(typeof(TouchingPolylines.TestCommands_02))]

namespace TouchingPolylines
{
   public class TestCommands_02
   {
      private static Document _doc => AcadApp.DocumentManager.MdiActiveDocument;
      private static Database _db => _doc.Database;
      private static Editor _ed => _doc.Editor;

      public static void WriteMessage(string msg) => _ed.WriteMessage(msg);


      [CommandMethod("plSegment")]
      public static void PlineSegment()
      {
         PromptEntityOptions peo = new PromptEntityOptions("\nSelect a Polyline Segment: ");
         peo.SetRejectMessage("\nMust be a Polyline...");
         peo.AddAllowedClass(typeof(Polyline), true);
         PromptEntityResult per = _ed.GetEntity(peo);

         if (per.Status == PromptStatus.Cancel) return;
         using (Transaction tr = _doc.TransactionManager.StartTransaction())
         {
            var pline = (Polyline)per.ObjectId.GetObject(OpenMode.ForRead);
            var wcsPickedPoint = per.PickedPoint.TransformBy(_ed.CurrentUserCoordinateSystem);
            var wcspointOnPline = pline.GetClosestPointTo(wcsPickedPoint, false);
            var segmentIndex = (int)pline.GetParameterAtPoint(wcspointOnPline);

            if (pline.GetSegmentType(segmentIndex) == SegmentType.Line)
            {
               _ed.WriteMessage("\n--------------------------------\n");
               LineSegment2d segment = pline.GetLineSegment2dAt(segmentIndex);
               _ed.WriteMessage($"segmentIndex: {segmentIndex}\n");
               _ed.WriteMessage($"segment Length: {segment.Length}\n");
               _ed.WriteMessage($"Angle: {( segment.Direction.Angle * 180 / Math.PI )}°\n");
               _ed.WriteMessage($"Start-WCS: {segment.StartPoint} , End-WCS: {segment.EndPoint}\n");

               _ed.WriteMessage($"per.PickedPoint(ucs): {per.PickedPoint}\n");
               _ed.WriteMessage($"Pline_Vertex2D(wcs): {pline.GetPoint2dAt(segmentIndex)} , 3D: {pline.GetPoint3dAt(segmentIndex)}\n");
            }
            else
            {
               _ed.WriteMessage($"\nsegment Type: {pline.GetSegmentType(segmentIndex)}\n");
            }
            tr.Commit();

            bool isOn = IsPointOnPolyline(pline, wcspointOnPline);
            _ed.WriteMessage($"IsPointOnPolyline: {isOn}\n");
         }

      }

      public static bool IsPointOnPolyline(Polyline pl, Point3d pt)           // this returns point is on polyline or not.
      {
         bool isOn = false;
         for (int i = 0; i < pl.NumberOfVertices; i++)
         {
            Curve3d seg = null;
            SegmentType segType = pl.GetSegmentType(i);
            if (segType == SegmentType.Arc)
               seg = pl.GetArcSegmentAt(i);
            else if (segType == SegmentType.Line)
               seg = pl.GetLineSegmentAt(i);
            if (seg != null)
            {
               isOn = seg.IsOn(pt);
               if (isOn)
                  break;
            }
         }
         return isOn;
      }
   }
}

Regards,

[kerry_w_brown]

In Fact, all versions test OK.

            _ed.WriteMessage($"IsPointOnPolyline: {IsPointOnPolyline(pline, wcspointOnPline)}\n");
            _ed.WriteMessage($"IsPointOnCurveGDAP: {IsPointOnCurveGDAP((Curve)pline, wcspointOnPline)}\n");
            _ed.WriteMessage($"IsPointOnCurveGCP: {IsPointOnCurveGCP((Curve)pline, wcspointOnPline)}\n");

      // A generalized IsPointOnCurve function that works on all
      // types of Curve (including PolyLines), but catches an
      // Exception on failure

      public static bool IsPointOnCurveGDAP(Curve cv, Point3d pt)
      {
         try
         {            // Return true if operation succeeds
            cv.GetDistAtPoint(pt);
            return true;
         }
         catch { }

         // Otherwise we return false
         return false;
      }

      // A generalized IsPointOnCurve function that works on all
      // types of Curve (including PolyLines), and checks the position
      // of the returned point rather than relying on catching an
      // exception

      public static bool IsPointOnCurveGCP(Curve cv, Point3d pt)
      {
         try
         {            // Return true if operation succeeds
            Point3d p = cv.GetClosestPointTo(pt, false);
            return ( p - pt ).Length <= Tolerance.Global.EqualPoint;
         }
         catch { }

         // Otherwise we return false
         return false;
      }


      public static bool IsPointOnPolyline(Polyline pl, Point3d pt)        
      {
         bool isOn = false;
         for (int i = 0; i < pl.NumberOfVertices; i++)
         {
            Curve3d seg = null;
            SegmentType segType = pl.GetSegmentType(i);
            if (segType == SegmentType.Arc)
               seg = pl.GetArcSegmentAt(i);
            else if (segType == SegmentType.Line)
               seg = pl.GetLineSegmentAt(i);
            if (seg != null)
            {
               isOn = seg.IsOn(pt);
               if (isOn)
                  break;
            }
         }
         return isOn;
      }

From this I'd conclude that the fault is with your "Moving" code, not with these methods.

Regards,

[kerry_w_brown]

Perhaps this will help

https://www.theswamp.org/index.php?topic=58137.msg613490#msg613490

[kerry_w_brown]

Any joy Vladimir ??