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