anchor.diff:  import 'dart:async';
  +import 'dart:math';
   import 'dart:typed_data';
   import 'dart:ui' as ui;
   
  
positive.code:     data = [
        _ChartData(
          'All',
          (stats.hourlyBlocked + stats.hourlyAllowed) / 30.0,
          const Color(0xff808080),
          ui.Gradient.sweep(
            const Offset(0.5, 0.5),
  
negative.code:       ),
        _ChartData(
          'Allowed',
          max(stats.rateAllowed / 1.0, 20),
          const Color(0xff33c75a),
          ui.Gradient.sweep(
            const Offset(0.5, 0.5),
  