/usr/lib/python3/dist-packages/leather/scales/temporal.py is in python3-leather 0.3.3-1.
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from datetime import datetime
import six
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.
"""
numerator = value - self._ticker.min
denominator = self._ticker.max - self._ticker.min
# Python 2 does not support timedelta division
if six.PY2:
if isinstance(self._ticker.min, datetime):
numerator = numerator.total_seconds()
denominator = denominator.total_seconds()
else:
numerator = float(numerator.days)
denominator = float(denominator.days)
pos = numerator / denominator
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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