Scales

class leather.Scale

Bases: object

Base class for various kinds of scale objects.

contains(v)

Return True if a given value is contained within this scale’s displayed domain.

format_tick(value, i, count)

Format ticks for display.

This method is used as a default which will be ignored if the user provides a custom tick formatter to the axis.

classmethod infer(layers, dimension, data_type)

Infer’s an appropriate default scale for a given sequence of Series.

Parameters:

• chart_series – A sequence of Series instances
• dimension – The dimension, X or Y of the data to infer for.
• data_type – The type of data contained in the series dimension.

project(value, range_min, range_max)

Project a value in this scale’s domain to a target range.

project_interval(value, range_min, range_max)

Project a value in this scale’s domain to an interval in the target range. This is used for places Bars and Columns.

ticks()

Generate a series of ticks for this scale.

class leather.Linear(domain_min, domain_max)

Bases: leather.scales.base.Scale

A scale that linearly maps values from a domain to a range.

Parameters:

• domain_min – The minimum value of the input domain.
• domain_max – The maximum value of the input domain.

contains(v)

Return True if a given value is contained within this scale’s domain.

project(value, range_min, range_max)

Project a value in this scale’s domain to a target range.

project_interval(value, range_min, range_max)

Project a value in this scale’s domain to an interval in the target range. This is used for places Bars and Columns.

ticks()

Generate a series of ticks for this scale.

class leather.Ordinal(domain)

Bases: leather.scales.base.Scale

A scale that maps individual values (e.g. strings) to a range.

contains(v)

Return True if a given value is contained within this scale’s displayed domain.

project(value, range_min, range_max)

Project a value in this scale’s domain to a target range.

project_interval(value, range_min, range_max)

Project a value in this scale’s domain to an interval in the target range. This is used for places Bars and Columns.

ticks()

Generate a series of ticks for this scale.

class leather.Temporal(domain_min, domain_max)

Bases: leather.scales.base.Scale

A scale that linearly maps date/datetime values from a domain to a range.

Parameters:

• domain_min – The minimum date/datetime of the input domain.
• domain_max – The maximum date/datetime of the input domain.

contains(v)

Return True if a given value is contained within this scale’s domain.

format_tick(value, i, count)

Format ticks for display.

This method is used as a default which will be ignored if the user provides a custom tick formatter to the axis.

project(value, range_min, range_max)

Project a value in this scale’s domain to a target range.

project_interval(value, range_min, range_max)

Project a value in this scale’s domain to an interval in the target range. This is used for places Bars and Columns.

ticks()

Generate a series of ticks for this scale.