anchor.diff:        ..setFillAlpha(65)
         ..setFillColor(ColorUtils.GRAY)
         ..setDrawCircleHole(false);
  +
  +    // TODO(terry): Dash crashes Canvas unimplemented in Flutter Web see issue
  +    //              https://github.com/flutter/flutter/issues/49882.
  +    if (kIsWeb) {
  +      // Disable dash and set the color to greenish.
  +      capacityHeapSet
  +        ..disableDashedLine()
  +        ..setColor1(ColorUtils.HOLO_GREEN_LIGHT);
  +    }
   
       // Create external memory dataset.
       const externalColorLine =
  
positive.code:       ..setFillColor(ColorUtils.LTGRAY)
        ..setDrawCircleHole(false);
  
      // Create a data object with all the data sets.
      androidChartController.data = LineData.fromList(
        [
  
negative.code: 
  import 'dart:ui' as dart_ui;
  
  import 'package:flutter/foundation.dart';
  import 'package:flutter/material.dart';
  import 'package:intl/intl.dart' as intl;
  
  