anchor.diff:  class Indicator {
     Point start;
     Point end;
  -  ParagraphPainter labelPainter;
  +  TextPainter labelPainter;
     Point labelPosition;
   }
   
   class ChartPainter {
  -  ChartPainter(ChartData data) : _data = data;
  +  ChartPainter(this._data);
   
     ChartData _data;
     ChartData get data => _data;
  
positive.code:         _textTheme.body1,
          [new PlainTextSpan("${gridline.value}")]
        );
        gridline.labelPainter = new ParagraphPainter(text)
          ..maxWidth = _rect.width
          ..layout();
        _horizontalGridlines.add(gridline);
  
negative.code:           _textTheme.body1,
            [new PlainTextSpan("${data.indicatorText}")]
          );
          _indicator.labelPainter = new TextPainter(text)
            ..maxWidth = markerRect.width
            ..layout();
          _indicator.labelPosition = new Point(
  