YLabelsCreatorAndPositioner class

Creates, scales, and formats the Y labels, from the transformed data to their positions and formatted strings on the Y axis.

The following members are most relevant in the creating and formatting labels

  • _dataYs is a list of numeric Y values, passed to constructor. An envelope is created from _dataYs, possibly extending the closure interval to start or end at 0.
    1. Ex1. for _dataYs -600.0 .... 2200.0 ==> dataYsEnvelope = -600.0, 2200.0
    2. Ex2. for _dataYs 600.0 .... 1800.0 ==> dataYsEnvelope = 0.0, 1800.0
  • axisY is the interval of the Y axis coordinates. e.g. 8.0, 400.0
  • yUserLabels may be set by user.
  • labelInfos are labels calculated to represent numeric Y values, ONLY in their highest order.
    1. Ex1. labelInfos ==> -1000, 0, 1000, 2000 (NOT ending at 2200)
    2. Ex2. labelInfos ==> 0, 1000, 2000 From the members dataYsEnvelope and labelInfos, the _mergedLabelYsIntervalWithDataYsEnvelope are calculated. The result serves as the '(transformed) data range'. All (transformed) data and labels are located inside the _mergedLabelYsIntervalWithDataYsEnvelope
  1. Ex1. for dataYsEnvelope=-600.0, 2200.0 and labelInfos=-1000, 0, 1000, 2000 ==> merged=-1000, 0, 1000, 2200
  2. Ex2. for dataYsEnvelope= 0.0, 1800.0 and labelInfos=0, 1000, 2000 ==> merged=0, 1000, 2000

Constructors

YLabelsCreatorAndPositioner({required List<double> dataYs, required Interval axisY, required ChartBehavior chartBehavior, required Function valueToLabel, required Function yInverseTransform, List<String>? yUserLabels})
Generative constructor allows to create labels.

Properties

dataYsEnvelope ↔ Interval
The dataYsEnvelope is created from the input _dataYs as it's closure interval, possibly extended to start at 0.
latefinal
dataYsOfLabels → List<double>
Extracts not-scaled && transformed values where labels from labelInfos are positioned.
no setter
hashCode → int
The hash code for this object.
no setterinherited
labelInfos ↔ List<LabelInfo>
Maintains labels created from data values, scaled and unscaled.
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
yUserLabels ↔ List<String>?
getter/setter pair

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
scaleY({required double value}) → double
Scales value
toString() → String
A string representation of this object.
inherited

Operators

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