anchor.diff:    late List<Offset> _points;
   
     late List<double> _pointAges;
  -  late List<Color> _colors;
  -  late List<double> _widths;
   
     /// The time it takes for an added point to fade out. It's total life time is
     /// [fadeDuration] + [fadeAfterDelay].
  
positive.code:     this.simplify = true,
      ColorSequence? colorSequence,
    }) {
      this.points = points;
  
      _colorSequence = colorSequence;
      _colorSequence ??= ColorSequence.fromStartAndEndColor(
  
negative.code:   EffectLine({
      required this.texture,
      this.transferMode = BlendMode.dstOver,
      List<Offset>? points,
      this.widthMode = EffectLineWidthMode.linear,
      this.minWidth = 10.0,
      this.maxWidth = 10.0,
  