anchor.diff:    /// for example you can draw just the last spot dot.
     final CheckToShowDot checkToShowDot;
   
  +  /// set [show] false to prevent dots from drawing,
  +  /// [dotColor] determines the color of circular dots on spots, and
  +  /// [dotSize] determines the size of dots.
  +  /// if you want to show or hide dots in some spots,
  +  /// override [checkToShowDot] to handle it in your way.
     const FlDotData({
       this.show = true,
       this.dotColor = Colors.blue,
  
positive.code:   /// determines should or shouldn't apply cutOffY
    final bool applyCutOffY;
  
    const BarAreaData({
      this.show = false,
      this.colors = const [Colors.blueGrey],
  
negative.code:     initSuperMinMaxValues(minX, maxX, minY, maxY);
    }
  
    /// fills [minX], [maxX], [minY], [maxY] if they are null,
    /// based on the provided [lineBarsData].
    void initSuperMinMaxValues(
      double minX,
      double maxX,
  