gradient property
      
      LinearGradient?
      get
      gradient
      
    
    
    
Implementation
LinearGradient? get gradient => _gradient;
      
      set
      gradient
      (LinearGradient? value) 
      
    
    
    
Implementation
set gradient(LinearGradient? value) {
  if (_gradient != value) {
    _gradient = value;
    markNeedsLegendUpdate();
    markNeedsSegmentsPaint();
  }
}