LineAnnotation class

A reference line annotation at a specific data value.

LineAnnotation draws a single line across the chart at a given data value, useful for showing thresholds, averages, or other reference values.

Example usage:

LineAnnotation(
  scale: yScale,
  value: 50,
  width: 400,
  height: 300,
  config: LineAnnotationConfig(
    color: Colors.red,
    dashPattern: [5, 3],
  ),
)
Inheritance

Constructors

LineAnnotation({Key? key, required dynamic scale, required dynamic value, required double width, required double height, LineAnnotationConfig config = const LineAnnotationConfig(), String? label, TextStyle? labelStyle, Offset labelOffset = const Offset(4, -4)})
Creates a line annotation.
const

Properties

config → LineAnnotationConfig
Configuration for the line.
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 near the line.
final
labelOffset → Offset
Offset for the label from the line.
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
value → dynamic
The data value where the line should be drawn.
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