anchor.diff:    final TextStyle titleStyle;
     final TextStyle valueStyle;
   
  +  /// Creates the circle graph
  +  ///
  +  /// The [title] and [value] must not be null
  +  ///
  +  /// [title] is the name of the displaying metric.
  +  /// [value] is the percent value of the metric.
  +  /// [padding] the padding of the [value] and [title] text inside the circle graph.
  +  /// [strokeWidth] the wight of the graph's stroke.
  +  /// [valueColor] the color of the part of the graph that represents the value.
  +  /// [strokeColor] the color of the graph's circle itself .
  +  /// [titleStyle] the [TextStyle] of the given [title].
  +  /// [valueStyle] the [TextStyle] of the percent text.
     const CirclePercentage({
       Key key,
       @required this.title,
  
positive.code: 
  import 'package:flutter/material.dart';
  
  class CirclePercentage extends StatefulWidget {
    final String title;
    final double value;
  
negative.code:   }
  }
  
  /// Paints a [CirclePercentage]
  class _CirclePercentageChartPainter extends CustomPainter {
    final double strokeWidth;
    final double percent;
  