AreaAnnotation class

A reference area annotation spanning a range of data values.

AreaAnnotation draws a filled rectangle between two data values, useful for highlighting ranges, confidence intervals, or zones.

Example usage:

AreaAnnotation(
  scale: yScale,
  startValue: 40,
  endValue: 60,
  width: 400,
  height: 300,
  config: AreaAnnotationConfig(
    fillColor: Colors.blue,
    fillOpacity: 0.2,
  ),
)
Inheritance

Constructors

AreaAnnotation({Key? key, required dynamic scale, required dynamic startValue, required dynamic endValue, required double width, required double height, AreaAnnotationConfig config = const AreaAnnotationConfig(), String? label, TextStyle? labelStyle, Alignment labelAlignment = Alignment.center})
Creates an area annotation.
const

Properties

config → AreaAnnotationConfig
Configuration for the area.
final
endValue → dynamic
The ending data value for the area.
final
hashCode → int
The hash code for this object.
no setterinherited
height → double
The height of the chart area.
finalinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
label → String?
Optional label to display in the area.
final
labelAlignment → Alignment
Alignment of the label within the area.
final
labelStyle → TextStyle?
Text style for the label.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scale → dynamic
The scale used to position the annotation.
finalinherited
startValue → dynamic
The starting data value for the area.
final
width → double
The width of the chart area.
finalinherited

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
getPosition(dynamic value) → double
Converts a data value to a pixel position using the scale.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited