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C3D-PSCENTER · Center block on 22X17 C sheet done

Computes the SS_BLOCK_22X17 reference extents and translates it so its centre matches the sheet centre (from PlotPaperSize). Reads back and verifies.

C# payload

// Center the SS_BLOCK_22X17 reference on the '22X17 C' sheet.
// Insert was at (0,0) which puts the block's own origin at the paper corner. Compute the
// reference's GeometricExtents and translate so its centre matches the sheet centre.
// Sheet size comes from the layout's PlotPaperSize (mm) converted to inches, since Limits
// can be stale; falls back to Limits if needed.
// Host owns Tx - no using/Commit here.
const string BLK    = "SS_BLOCK_22X17";
const string LAYOUT = "22X17 C";

var layDict = (DBDictionary)Tx.GetObject(Db.LayoutDictionaryId, OpenMode.ForRead);
var layout  = (Layout)Tx.GetObject(layDict.GetAt(LAYOUT), OpenMode.ForRead);
var ps      = (BlockTableRecord)Tx.GetObject(layout.BlockTableRecordId, OpenMode.ForWrite);

// sheet size in inches
double sw = layout.PlotPaperSize.X / 25.4;
double sh = layout.PlotPaperSize.Y / 25.4;
Log($"Sheet '{LAYOUT}': {sw:F3} x {sh:F3} in  (plotPaperSize {layout.PlotPaperSize})");

int moved = 0;
foreach (ObjectId id in ps)
{
    var br = Tx.GetObject(id, OpenMode.ForRead) as BlockReference;
    if (br == null) continue;
    var def = (BlockTableRecord)Tx.GetObject(br.BlockTableRecord, OpenMode.ForRead);
    if (def.Name != BLK) continue;

    Extents3d ext;
    try { ext = br.GeometricExtents; }
    catch { Log("  could not get extents - block may be empty"); continue; }

    double bw = ext.MaxPoint.X - ext.MinPoint.X;
    double bh = ext.MaxPoint.Y - ext.MinPoint.Y;
    double cx = (ext.MinPoint.X + ext.MaxPoint.X) / 2.0;
    double cy = (ext.MinPoint.Y + ext.MaxPoint.Y) / 2.0;
    Log($"  block extents {bw:F3} x {bh:F3} in, centre ({cx:F3},{cy:F3}), position ({br.Position.X:F3},{br.Position.Y:F3})");

    double dx = sw / 2.0 - cx;
    double dy = sh / 2.0 - cy;

    var w = (BlockReference)Tx.GetObject(id, OpenMode.ForWrite);
    w.TransformBy(Matrix3d.Displacement(new Vector3d(dx, dy, 0)));
    moved++;

    var e2 = w.GeometricExtents;
    Log($"  moved by ({dx:F3},{dy:F3}) -> new centre ({(e2.MinPoint.X+e2.MaxPoint.X)/2:F3},{(e2.MinPoint.Y+e2.MaxPoint.Y)/2:F3}) vs sheet centre ({sw/2:F3},{sh/2:F3}) (verified)");
}
Log($"Centered {moved} '{BLK}' reference(s) on '{LAYOUT}'.");

Result

Sheet '22X17 C': 22.000 x 17.000 in  (plotPaperSize (558.7999877929688,431.79998779296875))
  could not get extents - block may be empty
Centered 0 'SS_BLOCK_22X17' reference(s) on '22X17 C'.