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C3D-0218 · 260714 Huckaby: probe existing hatch patterns done

READ-ONLY. Lists the pattern name, type, scale and layer of every Hatch already in the drawing, to find one that is proven to work here before retrying the driveway concrete hatch.

C# payload

// READ-ONLY probe: what hatch patterns do existing hatches in this drawing use?
// 260714 has 25+ Hatch entities already (snapshot), so the drawing proves what works.
var bt = (BlockTable)Tx.GetObject(Db.BlockTableId, OpenMode.ForRead);
var seen = new Dictionary<string,int>();
foreach (ObjectId btrId in bt) {
    var btr = (BlockTableRecord)Tx.GetObject(btrId, OpenMode.ForRead);
    foreach (ObjectId id in btr) {
        Autodesk.AutoCAD.DatabaseServices.DBObject o;
        try { o = Tx.GetObject(id, OpenMode.ForRead); } catch { continue; }
        var h = o as Hatch;
        if (h == null) continue;
        string key;
        try {
            key = string.Format("{0} | type={1} scale={2:F3} layer={3}",
                h.PatternName, h.PatternType, h.PatternScale, h.Layer);
        } catch { continue; }
        if (!seen.ContainsKey(key)) seen[key] = 0;
        seen[key]++;
    }
}
Log("=== EXISTING HATCH PATTERNS ===");
foreach (var kv in seen) Log(string.Format("{0}   x{1}", kv.Key, kv.Value));
Log("distinct: " + seen.Count);

Result

=== EXISTING HATCH PATTERNS ===
AR-CONC | type=PreDefined scale=0.610 layer=X-DRIV-CONC   x1
SOLID | type=PreDefined scale=1.000 layer=0   x22
ANSI31 | type=PreDefined scale=1.000 layer=0   x2
ANSI31 | type=PreDefined scale=5.000 layer=LS-EX. TREE   x2
ANSI31 | type=PreDefined scale=2.000 layer=LS-BOULDER   x3
AR-CONC | type=PreDefined scale=1.000 layer=0   x1
distinct: 6