ScaleQuantize<Y> class final Quantize scales

Quantize scales are similar to linear scales, except they use a discrete rather than continuous range.

The continuous input domain is divided into uniform segments based on the number of values in (i.e., the cardinality of) the output range. Each range value y can be expressed as a quantized linear function of the domain value x: y = m round(x) + b. See the quantized choropleth for an example.

Implemented types

• Scale<num, Y>

Constructors

ScaleQuantize.new({List<num>? domain, required List<Y> range})

Constructs a new quantize scale with the specified domain and range.

Properties

domain ↔ List<num>

The scale's domain that specifies the input values.

getter/setter pair, override

hashCode → int

The hash code for this object.

no setter, inherited

range ↔ List<Y>

The scale's range that specifies the output values.

getter/setter pair, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

thresholds → List<num>

Returns the list of computed thresholds within the domain.

no setter

unknown ↔ Y?

getter/setter pair

Methods

call(num? x) → Y?

Given a value in the input domain, returns the corresponding value in the output range. For example, to apply a color encoding:

override

copy() → ScaleQuantize<Y>

Returns an exact copy of this scale.

override

invertExtent(Y y) → (num, num)

Returns the extent of values in the domain (x0, x1) for the corresponding value in the range: the inverse of call. This method is useful for interaction, say to determine the value in the domain that corresponds to the pixel location under the mouse.

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