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from leather.scales.base import Scale
from leather.ticks.score_time import ScoreTimeTicker
class Temporal(Scale):
"""
A scale that linearly maps date/datetime values from a domain to a range.
:param domain_min:
The minimum date/datetime of the input domain.
:param domain_max:
The maximum date/datetime of the input domain.
"""
def __init__(self, domain_min, domain_max):
if domain_min >= domain_max:
raise ValueError(
'Domain minimum must be less than domain maximum. '
'Inverted domains are not currently supported.'
)
self._data_min = domain_min
self._data_max = domain_max
self._ticker = ScoreTimeTicker(self._data_min, self._data_max)
def contains(self, v):
"""
Return :code:`True` if a given value is contained within this scale's
domain.
"""
return self._data_min <= v <= self._data_max
def project(self, value, range_min, range_max):
"""
Project a value in this scale's domain to a target range.
"""
pos = (value - self._ticker.min) / (self._ticker.max - self._ticker.min)
return ((range_max - range_min) * pos) + range_min
def project_interval(self, 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 :class:`.Bars` and :class:`.Columns`.
"""
raise NotImplementedError
def ticks(self):
"""
Generate a series of ticks for this scale.
"""
return self._ticker.ticks
def format_tick(self, 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.
"""
return self._ticker.format_tick(value)
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