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C3D-0151 · As-built labels at 0.08 (sidewalk, wall, conc, fence) [ASBUILT-LABELS] done

Labels each as-built polyline at height 0.08 with the feature name taken from its layer - SIDEWALK, WALL, CONC, FENCE - placed at the polyline midpoint and rotated to the tangent there, flipped where it would read upside-down. Each label sits on the same layer as the feature it names. Idempotent: an identical label within 1 ft is skipped.

C# payload

// As-built feature labels at height 0.08 - sidewalk, wall, concrete pad, fence.
//
// One label per polyline, placed at the polyline's own MIDPOINT and rotated to its tangent there,
// flipped if it would read upside-down. Each label goes on the layer of the feature it names, so
// it inherits that feature's visibility.
//
// Labels are derived from the LAYER of each polyline, not guessed - the layer already says what
// the feature is. Idempotent: an existing label with the same text within 1 ft is skipped.
const double H = 0.08;

var ms = (BlockTableRecord)Tx.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(Db), OpenMode.ForWrite);

var names = new Dictionary<string,string>();
names["SS-V-ROAD-EPVM"] = "SIDEWALK";
names["V-STRC-WALL"]    = "WALL";
names["X-DRIV-CONC"]    = "CONC";
names["SS-X-FENCE"]     = "FENCE";

// what is already labelled
var existing = new List<Tuple<string,Point3d>>();
foreach (ObjectId id in ms) {
    var mt0 = Tx.GetObject(id, OpenMode.ForRead) as MText;
    if (mt0 == null || mt0.IsErased) continue;
    existing.Add(Tuple.Create(mt0.Contents.Trim().ToUpper(), mt0.Location));
}

var todo = new List<ObjectId>();
foreach (ObjectId id in ms) {
    var pl = Tx.GetObject(id, OpenMode.ForRead) as Polyline;
    if (pl == null || pl.IsErased) continue;
    if (!names.ContainsKey(pl.Layer)) continue;
    todo.Add(id);
}
Log("candidate polylines: " + todo.Count);

int made = 0, skipped = 0;
foreach (ObjectId id in todo) {
    var pl = (Polyline)Tx.GetObject(id, OpenMode.ForRead);
    string txt = names[pl.Layer];

    Point3d mid; double rot = 0;
    try {
        mid = pl.GetPointAtDist(pl.Length / 2.0);
        var d = pl.GetFirstDerivative(mid);
        rot = Math.Atan2(d.Y, d.X) * 180.0 / Math.PI;
    } catch { mid = pl.StartPoint; }
    if (rot > 90 || rot <= -90) rot -= 180;

    bool dup = false;
    foreach (var e in existing)
        if (e.Item1 == txt && e.Item2.DistanceTo(mid) < 1.0) { dup = true; break; }
    if (dup) { skipped++; Log("   " + txt + " on " + pl.Layer + " already labelled - skipped"); continue; }

    var mt = new MText {
        Location   = mid,
        Contents   = txt,
        TextHeight = H,
        Rotation   = rot * Math.PI / 180.0,
        Attachment = AttachmentPoint.BottomCenter,
    };
    mt.Layer = pl.Layer;
    ms.AppendEntity(mt);
    Tx.AddNewlyCreatedDBObject(mt, true);
    existing.Add(Tuple.Create(txt, mid));
    made++;
    Log(String.Format("   \"{0}\" on {1,-18} at {2:F2},{3:F2} rot={4:F1} h={5}",
        txt, pl.Layer, mid.X, mid.Y, rot, H));
}

Log("");
Log("labels created: " + made + "   skipped: " + skipped);

int n = 0;
foreach (ObjectId id in ms) {
    var mt = Tx.GetObject(id, OpenMode.ForRead) as MText;
    if (mt == null || mt.IsErased) continue;
    if (Math.Abs(mt.TextHeight - H) < 1e-6) n++;
}
Log("MText at height " + H + " in model space: " + n + " (verified)");
Ed.Regen();

Result

candidate polylines: 9
   "WALL" on V-STRC-WALL        at 2238240.08,1325110.00 rot=-21.0 h=0.08
   "CONC" on X-DRIV-CONC        at 2238210.22,1325139.07 rot=-23.3 h=0.08
   "CONC" on X-DRIV-CONC        at 2238187.40,1325151.58 rot=-291.1 h=0.08
   "CONC" on X-DRIV-CONC        at 2238230.95,1325139.79 rot=-22.2 h=0.08
   "CONC" on X-DRIV-CONC        at 2238260.85,1325122.44 rot=-293.9 h=0.08
   "CONC" on X-DRIV-CONC        at 2238275.24,1325161.02 rot=-23.9 h=0.08
   "SIDEWALK" on SS-V-ROAD-EPVM     at 2238232.65,1325138.60 rot=-23.5 h=0.08
   "WALL" on V-STRC-WALL        at 2238239.63,1325109.33 rot=-21.0 h=0.08
   "FENCE" on SS-X-FENCE         at 2238320.85,1325110.30 rot=-329.9 h=0.08

labels created: 9   skipped: 0
MText at height 0.08 in model space: 9 (verified)