anchor.diff:    /// size, ... of the text.
     /// Drawing text will retrieve through [labelResolver],
     /// you can override it with your custom data.
  -  HorizontalLineLabel({
  -    EdgeInsets padding,
  -    TextStyle style,
  +  const HorizontalLineLabel({
  +    EdgeInsets padding = const EdgeInsets.all(6),
  +    TextStyle style = const TextStyle(
  +      color: Colors.black,
  +      fontWeight: FontWeight.bold,
  +      fontSize: 14,
  +    ),
       Alignment alignment = Alignment.topLeft,
       this.labelResolver = HorizontalLineLabel.defaultLineLabelResolver,
     }) : super(padding: padding, style: style, alignment: alignment);
  
positive.code:   /// size, ... of the text.
    /// Drawing text will retrieve through [labelResolver],
    /// you can override it with your custom data.
    VerticalLineLabel({
      EdgeInsets padding,
      TextStyle style,
      Alignment alignment = Alignment.bottomRight,
      this.labelResolver = VerticalLineLabel.defaultLineLabelResolver,
    }) : super(padding: padding, style: style, alignment: alignment);
  
negative.code:   /// It draws an image in left side of the chart, use [sizedPicture] for vectors,
    /// or [image] for any kind of image.
    HorizontalLine({
      @required this.y,
      this.label = const HorizontalLineLabel(),
      Color color = Colors.black,
      double strokeWidth = 2,
      List<int> dashArray,
  