anchor.diff:          radius = radius ?? 6,
           color = color ??
               Colors.primaries[((x * y) % Colors.primaries.length).toInt()],
  -        label = label,
  +        label = label ?? '',
           super(x, y);
   
     @override
  
positive.code:       show: show ?? this.show,
        radius: radius ?? this.radius,
        color: color ?? this.color,
        label: label,
      );
    }
  
  
negative.code:   Color color;
  
    /// Determines label of the spot.
    final String label;
  
    /// You can change [show] value to show or hide the spot,
    /// [x], and [y] defines the location of spot in the [ScatterChart],
  