64 lines
2.0 KiB
Python
64 lines
2.0 KiB
Python
"""Scaling util functions."""
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from __future__ import annotations
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def scale_ranged_value_to_int_range(
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source_low_high_range: tuple[float, float],
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target_low_high_range: tuple[float, float],
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value: float,
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) -> int:
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"""Given a range of low and high values convert a single value to another range.
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Given a source low value of 1 and a high value of 255 and
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a target range from 1 to 100 this function
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will return:
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(1,255), (1,100), 255: 100
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(1,255), (1,100), 127: 49
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(1,255), (1,100), 10: 3
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"""
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source_offset = source_low_high_range[0] - 1
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target_offset = target_low_high_range[0] - 1
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return int(
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(value - source_offset)
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* states_in_range(target_low_high_range)
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// states_in_range(source_low_high_range)
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+ target_offset
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)
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def scale_to_ranged_value(
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source_low_high_range: tuple[float, float],
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target_low_high_range: tuple[float, float],
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value: float,
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) -> float:
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"""Given a range of low and high values convert a single value to another range.
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Do not include 0 in a range if 0 means off,
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e.g. for brightness or fan speed.
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Given a source low value of 1 and a high value of 255 and
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a target range from 1 to 100 this function
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will return:
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(1,255), 255: 100
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(1,255), 127: ~49.8039
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(1,255), 10: ~3.9216
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"""
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source_offset = source_low_high_range[0] - 1
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target_offset = target_low_high_range[0] - 1
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return (value - source_offset) * (
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states_in_range(target_low_high_range)
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) / states_in_range(source_low_high_range) + target_offset
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def states_in_range(low_high_range: tuple[float, float]) -> float:
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"""Given a range of low and high values return how many states exist."""
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return low_high_range[1] - low_high_range[0] + 1
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def int_states_in_range(low_high_range: tuple[float, float]) -> int:
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"""Given a range of low and high values return how many integer states exist."""
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return int(states_in_range(low_high_range))
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