PolygonOptions constructor
      const
      PolygonOptions({})
     
    
    
Implementation
const PolygonOptions({
  required this.contours,
  this.color = const Color(),
  this.strokeWidth = const LogicalPixel(0),
  this.strokeColor = const Color(),
  this.visible = true,
  this.userData = const {},
  this.zIndex = const ZIndex(0),
  this.levelId = null
});