ScaleLog<Y> class final Log scales

Logarithmic (“log”) scales are like linear scales except that a logarithmic transform is applied to the input domain value before the output range value is computed.

The mapping to the range value y can be expressed as a function of the domain value x: y = m log(x) + b.

CAUTION: As log(0) = -∞, a log scale domain must be strictly-positive or strictly-negative; the domain must not include or cross zero. A log scale with a positive domain has a well-defined behavior for positive values, and a log scale with a negative domain has a well-defined behavior for negative values. (For a negative domain, input and output values are implicitly multiplied by -1.) The behavior of the scale is undefined if you pass a negative value to a log scale with a positive domain or vice versa.

Implemented types

• Scale<X, Y>

Constructors

ScaleLog.new({List<num> domain = const [1, 10], required List<Y> range, required Interpolate<Y> interpolate})

Constructs a new log scale with the specified domain, range and interpolate, the base 10, and clamping disabled.

Properties

base ↔ num

The scale's base.

getter/setter pair, inherited

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() → ScaleLog<Y>

Returns an exact copy of this scale.

override

nice([num count = 0]) → void

Like ScaleLinear.nice, except extends the domain to integer powers of base.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

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

Like ScaleLinear.tickFormat, but customized for a log scale.

inherited

ticks([num count = 10]) → List<num>

Like ScaleLinear.ticks, but customized for a log scale.

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 [1, 10], List<Object?> range = const <num>[0, 1], Interpolate<Object?> interpolate = interpolate}) → ScaleLog<Object?>

number({List<num> domain = const [1, 10], List<num> range = const [0, 1], Interpolate<num> interpolate = interpolateNumber}) → ScaleLog<num>