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C3D-CURBOFF2 · Flip curb offsets to correct side done

Erases the 125 wrong-side offsets and redraws them on the opposite side. 0.5ft face + 2.0ft flowline unchanged.

C# payload

// Fix: the curb offsets went the WRONG WAY. Erase the offsets created by C3D-CURBOFF and
// redo them with the direction flipped - offset toward the BUILDING side, not away.
// Distances unchanged: 0.5' (top face of curb, close to TBC) and 2.0' (flowline).
// Identifies the offsets to erase by handle range (they are the newest entities on the layer).
// Host owns Tx/ModelSpace - no using/Commit here.
const string LAYER = "SS-V-ROAD-CURB";
const double MINLEN = 3.0, MAXLEN = 500.0;

// building centroid
double bx = 0, by = 0; int bn = 0;
foreach (ObjectId id in ModelSpace)
{
    var e = Tx.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
    if (e == null || e.Layer != "SS-V-BLDG-OTLN") continue;
    var p = e as Polyline;
    if (p == null) continue;
    for (int i = 0; i < p.NumberOfVertices; i++) { var v = p.GetPoint2dAt(i); bx += v.X; by += v.Y; bn++; }
}
bx /= bn; by /= bn;

// collect all curb polylines, note the 125 newest = the bad offsets
var all = new List<(ObjectId id, long h, double len)>();
foreach (ObjectId id in ModelSpace)
{
    var e = Tx.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
    if (e == null || e.Layer != LAYER) continue;
    var p = e as Polyline;
    if (p == null) continue;
    all.Add((id, System.Convert.ToInt64(e.Handle.ToString(), 16), p.Length));
}
all.Sort((a,b) => a.h.CompareTo(b.h));
Log($"{all.Count} Polylines on layer; erasing the {125} newest (the bad offsets).");

int erased = 0;
for (int i = all.Count - 125; i < all.Count; i++)
{
    if (i < 0) continue;
    var w = (Autodesk.AutoCAD.DatabaseServices.Entity)Tx.GetObject(all[i].id, OpenMode.ForWrite);
    w.Erase();
    erased++;
}
Log($"Erased {erased} bad offsets.");

// re-offset the remaining sources, FLIPPED
var srcs = new List<ObjectId>();
foreach (ObjectId id in ModelSpace)
{
    var e = Tx.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
    if (e == null || e.Layer != LAYER || e.IsErased) continue;
    var p = e as Polyline;
    if (p == null || p.Length < MINLEN || p.Length > MAXLEN) continue;
    srcs.Add(id);
}
Log($"{srcs.Count} curb Polylines to re-offset.");

double DistFromBldg(Autodesk.AutoCAD.DatabaseServices.Entity e)
{
    var p = e as Polyline;
    if (p == null || p.NumberOfVertices == 0) return -1;
    double mx = 0, my = 0;
    for (int i = 0; i < p.NumberOfVertices; i++) { var v = p.GetPoint2dAt(i); mx += v.X; my += v.Y; }
    mx /= p.NumberOfVertices; my /= p.NumberOfVertices;
    return System.Math.Sqrt((mx-bx)*(mx-bx) + (my-by)*(my-by));
}

int made = 0, failed = 0;
foreach (var id in srcs)
{
    var pl = (Polyline)Tx.GetObject(id, OpenMode.ForRead);
    int sign = 0;
    try
    {
        var pos = pl.GetOffsetCurves(0.5);
        var neg = pl.GetOffsetCurves(-0.5);
        double dp = pos.Count > 0 ? DistFromBldg((Autodesk.AutoCAD.DatabaseServices.Entity)pos[0]) : -1;
        double dn = neg.Count > 0 ? DistFromBldg((Autodesk.AutoCAD.DatabaseServices.Entity)neg[0]) : -1;
        if (dp < 0 && dn < 0) { failed++; continue; }
        sign = (dp >= dn) ? -1 : 1;      // FLIPPED from the previous run
    }
    catch { failed++; continue; }

    foreach (double d in new double[] { 0.5, 2.0 })
    {
        try
        {
            var curves = pl.GetOffsetCurves(sign * d);
            foreach (Autodesk.AutoCAD.DatabaseServices.Entity oe in curves)
            {
                oe.Layer = LAYER;
                ModelSpace.AppendEntity(oe);
                Tx.AddNewlyCreatedDBObject(oe, true);
                made++;
            }
        }
        catch { failed++; }
    }
}
Log($"Created {made} offsets on the FLIPPED side (0.5' face + 2.0' flowline). {failed} failures.");

Result

188 Polylines on layer; erasing the 125 newest (the bad offsets).
Erased 125 bad offsets.
62 curb Polylines to re-offset.
Created 126 offsets on the FLIPPED side (0.5' face + 2.0' flowline). 0 failures.