debugPaint method
Implementation
@override
void debugPaint(Context context) {
final rx = box!.width / 2.0;
final ry = box!.height / 2.0;
context.canvas
..setStrokeColor(PdfColors.deepPurple)
..setLineWidth(1)
..drawEllipse(box!.x + rx, box!.y + ry, rx, ry)
..strokePath();
}