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C3D-0095 · Create DELTA OFF curve label style in both collections [PUT-DELTA-OFF] done

Creates the DELTA OFF curve label style in the active drawing in both the Parcel curve collection and the General curve collection, with the ARC/CHD/bearing/RAD format, captured heights and offsets, and the Closed filled leader. Contains no erase; verifies both collections afterwards.

C# payload

// Create "DELTA OFF" curve label style in BOTH collections of the active drawing:
//    civil.Styles.LabelStyles.ParcelLabelStyles.CurveLabelStyles
//    civil.Styles.LabelStyles.GeneralCurveLabelStyles     <- sits directly on LabelStyles
//
// Values captured from the user's DELTA OFF style (C3D-0093):
//    "Table Tag"         C<[Parcel Curve Number]>            visible, Y +0.0020833
//    "Distance & Radius" ARC/CHD/chord-dir/RAD               visible, Y -0.0020833
//    "Delta"             delta angle                         INVISIBLE, Y +0.0020833
//    height 0.0083333, colour BYLAYER, leader Closed filled 0.0083333
//
// The format string is a @"" verbatim literal - \P is the MText newline code (cookbook 13).
// NO ERASE. If the style already exists in a collection it is edited in place.
const string DST = "DELTA OFF";
const double H  = 0.008333333333333333;
const double DY = 0.0020833333333333333;

const string FMT = @"ARC-<[Segment Length(Uft|P2|RN|AP|Sn|OF)]>'\PCHD-<[Segment Chord Length(Uft|P2|RN|AP|GC|UN|Sn|OF)]>'\P<[Segment Chord Direction(Udeg|FDMSdSp|MB|P4|RN|DSn|CU|AP|EN|DZY|OF)]>\PRAD-<[Segment Radius(Uft|P2|RN|AP|Sn|OF)]>'";
const string DELTA_FMT = @"{\fSimplex|b0|i0|c161|p2;\U+0394\fSimplex|b0|i0|c0|p0;=}<[Segment Delta Angle(Udeg|FD|P2|RN|AP|OF)]>";

var civil = CivilApplication.ActiveDocument;
Log("drawing: " + Db.Filename);

Action<Autodesk.Civil.DatabaseServices.Styles.LabelStyleCollection, string> build = (coll, label) => {
    ObjectId id = ObjectId.Null;
    foreach (ObjectId sid in coll) {
        var s0 = Tx.GetObject(sid, OpenMode.ForRead) as Autodesk.Civil.DatabaseServices.Styles.LabelStyle;
        if (s0 != null && !s0.IsErased && s0.Name == DST) { id = sid; break; }
    }
    if (id.IsNull) { id = coll.Add(DST); Log(label + ": created \"" + DST + "\""); }
    else Log(label + ": \"" + DST + "\" exists - editing in place");

    var st = (Autodesk.Civil.DatabaseServices.Styles.LabelStyle)Tx.GetObject(id, OpenMode.ForWrite);

    // the inherited component (from Standard) becomes the ARC/CHD/RAD one
    bool wroteFmt = false;
    foreach (ObjectId cid in st.GetComponents(Autodesk.Civil.DatabaseServices.Styles.LabelStyleComponentType.Text)) {
        var c = Tx.GetObject(cid, OpenMode.ForWrite) as Autodesk.Civil.DatabaseServices.Styles.LabelStyleTextComponent;
        if (c == null) continue;
        if (c.Name == "Table Tag") {
            c.Text.Height.Value  = H;
            c.Text.YOffset.Value = DY;
            continue;
        }
        if (!wroteFmt) {
            c.Text.Contents.Value = FMT;
            c.Text.Height.Value   = H;
            c.Text.XOffset.Value  = 0.0;
            c.Text.YOffset.Value  = -DY;
            wroteFmt = true;
            Log("   format written to component \"" + c.Name + "\"");
        }
    }
    if (!wroteFmt) Log("   WARNING: no non-tag text component found to hold the format");

    // leader
    try {
        st.Properties.Leader.Visibility.Value    = true;
        st.Properties.Leader.ArrowheadSize.Value = H;
        st.Properties.Leader.ArrowheadStyle.Value = "Closed filled";
    } catch (System.Exception ex) { Log("   leader: " + ex.Message); }
};

build(civil.Styles.LabelStyles.ParcelLabelStyles.CurveLabelStyles, "PARCEL ");
build(civil.Styles.LabelStyles.GeneralCurveLabelStyles,            "GENERAL");

// verify both
Log("");
Action<Autodesk.Civil.DatabaseServices.Styles.LabelStyleCollection, string> check = (coll, label) => {
    foreach (ObjectId sid in coll) {
        var s = Tx.GetObject(sid, OpenMode.ForRead) as Autodesk.Civil.DatabaseServices.Styles.LabelStyle;
        if (s == null || s.IsErased || s.Name != DST) continue;
        Log("VERIFY " + label + " \"" + s.Name + "\"");
        foreach (ObjectId cid in s.GetComponents(Autodesk.Civil.DatabaseServices.Styles.LabelStyleComponentType.Text)) {
            var c = Tx.GetObject(cid, OpenMode.ForRead) as Autodesk.Civil.DatabaseServices.Styles.LabelStyleTextComponent;
            if (c == null) continue;
            bool v = true; try { v = c.General.Visible.Value; } catch { }
            string ct = ""; try { ct = c.Text.Contents.Value; } catch { }
            Log("    \"" + c.Name + "\" visible=" + v + "  " + (ct.Length > 60 ? ct.Substring(0,60) + "..." : ct));
        }
    }
};
check(civil.Styles.LabelStyles.ParcelLabelStyles.CurveLabelStyles, "PARCEL ");
check(civil.Styles.LabelStyles.GeneralCurveLabelStyles,            "GENERAL");
Ed.Regen();

Result

drawing: C:\Users\sanja\OneDrive\_SurveyDisco\SS_BLOCK_11X17.dwg
PARCEL : created "DELTA OFF"
   format written to component "Distance and Radius"
GENERAL: created "DELTA OFF"
   format written to component "Distance and Radius"

VERIFY PARCEL  "DELTA OFF"
    "Table Tag" visible=True  C<[Parcel Curve Number(Sn|GC|UN)]>
    "Distance and Radius" visible=True  ARC-<[Segment Length(Uft|P2|RN|AP|Sn|OF)]>'\PCHD-<[Segment C...
VERIFY GENERAL "DELTA OFF"
    "Table Tag" visible=True  C<[Label Tag Number(Sn|GC|UN)]>
    "Distance and Radius" visible=True  ARC-<[Segment Length(Uft|P2|RN|AP|Sn|OF)]>'\PCHD-<[Segment C...