anchor.diff:        show: show ?? this.show,
         radius: radius ?? this.radius,
         color: color ?? this.color,
  -      label: label,
  +      label: label ?? this.label,
       );
     }
   
  
positive.code:         radius = radius ?? 6,
          color = color ??
              Colors.primaries[((x * y) % Colors.primaries.length).toInt()],
          label = label,
          super(x, y);
  
    @override
  
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],
  