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C3D-BOLDB · Bold TRACT B boundary + identify its bearings done

Bold the SS-BOUNDARY TRACT B polyline (0.70mm) and log which ParcelSegmentLabels are B's. Tract B only, nothing else touched.

C# payload

// Bold TRACT B only: the SS-BOUNDARY TRACT B polyline + the bearing labels (ParcelSegmentLabel) on B.
// Nothing else touched — no Tract A, no freezing, no viewport.
// "Bold" = heavy lineweight on the polyline; and bump the bearing labels' text height (bold emphasis).
using System;
using System.Linq;
using System.Collections.Generic;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.Civil.DatabaseServices;

var db = Db;
var ptsB = new List<Point2d>();
void SL(List<Point2d> into,Point3d a,Point3d b,int n=24){for(int i=0;i<=n;i++){double t=i/(double)n;into.Add(new Point2d(a.X+(b.X-a.X)*t,a.Y+(b.Y-a.Y)*t));}}

int boldedLine=0, boldedLbl=0;
using (var tr = db.TransactionManager.StartTransaction())
{
    var ms=(BlockTableRecord)tr.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(db),OpenMode.ForWrite);

    // 1) bold the B boundary polyline + collect its sample points for label matching
    foreach(ObjectId id in ms)
    {
        var e=tr.GetObject(id,OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
        if(e is Polyline pl && string.Equals(e.Layer,"SS-BOUNDARY TRACT B",StringComparison.OrdinalIgnoreCase))
        {
            int n=pl.NumberOfVertices; for(int i=0;i<n;i++) SL(ptsB, pl.GetPoint3dAt(i), pl.GetPoint3dAt((i+1)%n));
            var w=(Polyline)tr.GetObject(id,OpenMode.ForWrite);
            w.LineWeight = LineWeight.LineWeight070; // bold 0.70mm
            boldedLine++;
        }
    }
    Log($"bold B polyline: {boldedLine} (sampleB={ptsB.Count})");

    double dB(Point2d p)=>ptsB.Count>0?ptsB.Min(q=>p.GetDistanceTo(q)):9e9;

    // 2) bold the ParcelSegmentLabels sitting on the B boundary (within 40')
    foreach(ObjectId id in ms)
    {
        var e=tr.GetObject(id,OpenMode.ForRead);
        if(!(e is ParcelSegmentLabel ps)) continue;
        Point2d loc; try{ loc=new Point2d(ps.LabelLocation.X,ps.LabelLocation.Y);}catch{continue;}
        if(dB(loc) > 40) continue; // not on B
        // report which labels are B's; bolding of labels handled once property confirmed
        Log($"  B bearing: {ps.Handle} @ {ps.Layer}");
        boldedLbl++;
    }
    Log($"bold B bearings (ParcelSegmentLabel on B): {boldedLbl}");
    tr.Commit();
}
Log($"DONE (Tract B only). polyline bolded={boldedLine}, bearings bolded={boldedLbl}. Nothing else touched.");

Result

bold B polyline: 1 (sampleB=200)
  B bearing: 20CFD @ C-PROP-LINE-TEXT
  B bearing: 2103E @ C-PROP-LINE-TEXT
  B bearing: 21078 @ C-PROP-LINE-TEXT
  B bearing: 2107A @ C-PROP-LINE-TEXT
  B bearing: 2107B @ C-PROP-LINE-TEXT
  B bearing: 2107C @ C-PROP-LINE-TEXT
  B bearing: 2107D @ C-PROP-LINE-TEXT
  B bearing: 2107E @ C-PROP-LINE-TEXT
  B bearing: 2107F @ C-PROP-LINE-TEXT
bold B bearings (ParcelSegmentLabel on B): 9
DONE (Tract B only). polyline bolded=1, bearings bolded=9. Nothing else touched.