CartesianChartAnnotation constructor
      const
      CartesianChartAnnotation({ 
    
- required Widget widget,
- required dynamic x,
- required dynamic y,
- CoordinateUnit coordinateUnit = CoordinateUnit.logicalPixel,
- String? xAxisName,
- String? yAxisName,
- AnnotationRegion region = AnnotationRegion.chart,
- ChartClipBehavior clip = ChartClipBehavior.clip,
- ChartAlignment horizontalAlignment = ChartAlignment.center,
- ChartAlignment verticalAlignment = ChartAlignment.center,
Creating an argument constructor of CartesianChartAnnotation class.
Implementation
const CartesianChartAnnotation({
  required this.widget,
  required this.x,
  required this.y,
  this.coordinateUnit = CoordinateUnit.logicalPixel,
  this.xAxisName,
  this.yAxisName,
  this.region = AnnotationRegion.chart,
  this.clip = ChartClipBehavior.clip,
  this.horizontalAlignment = ChartAlignment.center,
  this.verticalAlignment = ChartAlignment.center,
});