ScaleLinear<Y> class final Linear scales

Linear scales map a continuous, quantitative input domain to a continuous output range using a linear transformation (translate and scale).

If the range is also numeric, the mapping may be inverted (see ScaleContinuousNumberExtension.invert). Linear scales are a good default choice for continuous quantitative data because they preserve proportional differences. Each range value y can be expressed as a function of the domain value x: y = mx + b.

Implemented types

• Scale<X, Y>

Constructors

ScaleLinear.new({List<num> domain = const [0, 1], required List<Y> range, required Interpolate<Y> interpolate})

Constructs a new linear scale with the specified domain, range and interpolate, and clamping disabled.

Properties

clamp ↔ bool

Whether or not the scale currently clamps values to within the range.

getter/setter pair, inherited

domain ↔ List<num>

The scale's domain that specifies the input values.

getter/setter pair, inherited

hashCode → int

The hash code for this object.

no setter, inherited

interpolate ↔ Interpolate<Y>

The scale’s range interpolator factory.

getter/setter pair, inherited

range ↔ List<Y>

The scale's range that specifies the output values.

getter/setter pair, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

unknown ↔ Y?

The output value of the scale for null (or double.nan) input values.

getter/setter pair, inherited

Methods

call(num? x) → Y?

Given a value from the domain, returns the corresponding value from the range.

inherited

copy() → ScaleLinear<Y>

Returns an exact copy of this scale.

override

nice([num count = 10]) → void

Extends the domain so that it starts and ends on nice round values.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

tickFormat([num count = 10, String? specifier]) → String Function(num)

Returns a number format function suitable for displaying a tick value, automatically computing the appropriate precision based on the fixed interval between tick values.

inherited

ticks([num count = 10]) → List<num>

Returns approximately count representative values from the scale’s domain.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

dynamic({List<num> domain = const [0, 1], List<Object?> range = const <num>[0, 1], Interpolate<Object?> interpolate = interpolate}) → ScaleLinear<Object?>

number({List<num> domain = const [0, 1], List<num> range = const [0, 1], Interpolate<num> interpolate = interpolateNumber}) → ScaleLinear<num>