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C3D-0156 · As-built labels to layer 0 + before snapshot [ASB-TO-0] done

Moves the four as-built labels to layer 0 and records each one exact location, rotation, attachment and height, plus its perpendicular offset and side relative to the feature polyline it names, as the baseline for diffing after the user nudges them by hand.

C# payload

// Move the four as-built labels to layer 0, then snapshot their exact placement as the BEFORE
// baseline - the user is about to nudge them by hand so the convention can be measured from the
// diff (same method that produced the arc rule).
//
// Captures for each label: location, rotation, attachment, height, and its offset from the
// feature polyline it names - distance and which SIDE - since that offset is the thing being taught.
var ms = (BlockTableRecord)Tx.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(Db), OpenMode.ForWrite);
Log("drawing: " + Db.Filename);

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

int moved = 0;
foreach (ObjectId id in ms) {
    var mt0 = Tx.GetObject(id, OpenMode.ForRead) as MText;
    if (mt0 == null || mt0.IsErased) continue;
    if (!names.ContainsKey(mt0.Contents.Trim().ToUpper())) continue;
    if (mt0.Layer == "0") continue;
    var mt = (MText)Tx.GetObject(id, OpenMode.ForWrite);
    string was = mt.Layer;
    mt.Layer = "0";
    moved++;
    Log("  \"" + mt.Contents + "\"  " + was + " -> 0");
}
Log("moved to layer 0: " + moved);

Log("");
Log("=== BEFORE SNAPSHOT ===");
foreach (ObjectId id in ms) {
    var mt = Tx.GetObject(id, OpenMode.ForRead) as MText;
    if (mt == null || mt.IsErased) continue;
    string c = mt.Contents.Trim().ToUpper();
    if (!names.ContainsKey(c)) continue;

    // nearest point on the feature polyline this label names
    double best = 1e18; double side = 0; Point3d foot = mt.Location;
    foreach (ObjectId pid in ms) {
        var pl = Tx.GetObject(pid, OpenMode.ForRead) as Polyline;
        if (pl == null || pl.IsErased || pl.Layer != names[c]) continue;
        for (int i = 0; i < pl.NumberOfVertices - 1; i++) {
            var A = pl.GetPoint2dAt(i); var B = pl.GetPoint2dAt(i+1);
            double vx = B.X-A.X, vy = B.Y-A.Y, L2 = vx*vx+vy*vy;
            double t = L2 > 0 ? ((mt.Location.X-A.X)*vx + (mt.Location.Y-A.Y)*vy)/L2 : 0;
            if (t < 0) t = 0; if (t > 1) t = 1;
            double qx = A.X+t*vx, qy = A.Y+t*vy;
            double d = Math.Sqrt(Math.Pow(mt.Location.X-qx,2)+Math.Pow(mt.Location.Y-qy,2));
            if (d < best) {
                best = d; foot = new Point3d(qx,qy,0);
                side = vx*(mt.Location.Y-A.Y) - vy*(mt.Location.X-A.X);
            }
        }
    }
    Log(String.Format("SNAP [{0}] \"{1}\" layer={2} h={3}", mt.Handle, mt.Contents, mt.Layer, mt.TextHeight));
    Log(String.Format("     location {0:F4},{1:F4}  rotation {2:F4} deg  attach {3}",
        mt.Location.X, mt.Location.Y, mt.Rotation*180.0/Math.PI, mt.Attachment));
    Log(String.Format("     offset from {0}: {1:F4} ft, side {2}  (foot {3:F4},{4:F4})",
        names[c], best, side > 0 ? "LEFT" : "RIGHT", foot.X, foot.Y));
}
Ed.Regen();

Result

drawing: C:\Users\sanja\OneDrive\_SurveyDisco\260802 - 4082 Sweetbriar Ln, Forest Park, GA 30297, USA\260802 - 4082 Sweetbriar Ln.dwg
  "WALL"  V-STRC-WALL -> 0
  "CONC"  X-DRIV-CONC -> 0
  "SIDEWALK"  SS-V-ROAD-EPVM -> 0
  "FENCE"  SS-X-FENCE -> 0
moved to layer 0: 4

=== BEFORE SNAPSHOT ===
SNAP [20C89] "WALL" layer=0 h=0.8
     location 2238240.0770,1325109.9995  rotation 339.0145 deg  attach BottomCenter
     offset from V-STRC-WALL: 0.0000 ft, side LEFT  (foot 2238240.0770,1325109.9995)
SNAP [20C8A] "CONC" layer=0 h=0.8
     location 2238210.2195,1325139.0679  rotation 336.6671 deg  attach BottomCenter
     offset from X-DRIV-CONC: 0.0000 ft, side LEFT  (foot 2238210.2195,1325139.0679)
SNAP [20C8F] "SIDEWALK" layer=0 h=0.8
     location 2238232.6465,1325138.6031  rotation 336.5170 deg  attach BottomCenter
     offset from SS-V-ROAD-EPVM: 0.0000 ft, side LEFT  (foot 2238232.6465,1325138.6031)
SNAP [20C91] "FENCE" layer=0 h=0.8
     location 2238320.8512,1325110.2963  rotation 30.0905 deg  attach BottomCenter
     offset from SS-X-FENCE: 0.0000 ft, side RIGHT  (foot 2238320.8512,1325110.2963)