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#!/usr/bin/env python3
# *****************************************************************************
# Copyright (C) 2019-2022 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
# This file is part of the thcolor project, which is MIT-licensed.
# *****************************************************************************
""" Angle representation and conversions. """
from math import pi as _pi
from typing import Any as _Any, Optional as _Optional
from .utils import round_half_up as _round_half_up
__all__ = [
'Angle', 'DegreesAngle', 'GradiansAngle', 'RadiansAngle', 'TurnsAngle',
]
class Angle:
""" Abstract class representing an angle within thcolor.
Used for some color representations (most notably hue).
"""
__slots__ = ()
_value: float
_bottom: float = 0
_top: float = 1
def __init__(self):
pass
def __repr__(self):
params = (
(key, getattr(self, key)) for key in dir(self)
if not key.startswith('_') and not callable(getattr(self, key))
)
return (
f'{self.__class__.__name__}('
f"{', '.join(f'{key}={val!r}' for key, val in params)})"
)
def __eq__(self, other):
if not isinstance(other, Angle):
return False
return (
round(self.asturns().turns, 6) == round(other.asturns().turns, 6)
)
def asdegrees(self) -> 'DegreesAngle':
""" Get the current angle as a degrees angle. """
try:
value = self._value
ob = self._bottom
ot = self._top
except AttributeError:
raise NotImplementedError from None
nb = DegreesAngle._bottom
nt = DegreesAngle._top
return DegreesAngle((value - ob) / (ot - ob) * (nt - nb) + nb)
def asgradians(self) -> 'GradiansAngle':
""" Get the current angle as a gradians angle. """
try:
value = self._value
ob = self._bottom
ot = self._top
except AttributeError:
raise NotImplementedError from None
nb = GradiansAngle._bottom
nt = GradiansAngle._top
return GradiansAngle((value - ob) / (ot - ob) * (nt - nb) + nb)
def asradians(self) -> 'RadiansAngle':
""" Get the current angle as a radians angle. """
try:
value = self._value
ob = self._bottom
ot = self._top
except AttributeError:
raise NotImplementedError from None
nb = RadiansAngle._bottom
nt = RadiansAngle._top
return RadiansAngle((value - ob) / (ot - ob) * (nt - nb) + nb)
def asturns(self) -> 'TurnsAngle':
""" Get the current angle as a turns angle. """
try:
value = self._value
ob = self._bottom
ot = self._top
except AttributeError:
raise NotImplementedError from None
nb = TurnsAngle._bottom
nt = TurnsAngle._top
return TurnsAngle((value - ob) / (ot - ob) * (nt - nb) + nb)
def asprincipal(self):
""" Get the principal angle. """
cls = self.__class__
value = self._value
bottom, top = cls._bottom, cls._top
return cls((value - bottom) % (top - bottom) + bottom)
@classmethod
def fromtext(
cls,
expr: str,
decoder: _Optional[_Any] = None,
) -> 'Angle':
""" Create a color from a string.
:param expr: The expression to decode.
"""
if decoder is None:
from .builtin import DefaultColorDecoder
decoder = DefaultColorDecoder()
results = decoder.decode(expr, prefer_angles=True)
if len(results) != 1 or not isinstance(results[0], cls):
raise ValueError(
f'result of expression was not an instance of {cls.__name__}: '
f'single color: {results!r}',
)
return results[0]
class DegreesAngle(Angle):
""" An angle expressed in degrees.
A 270° angle can be created the following way:
.. code-block:: python
angle = DegreesAngle(270)
:param degrees: Degrees; canonical values are between 0 and 360
excluded.
"""
__slots__ = ('_value')
_bottom = 0
_top = 360.0
def __init__(self, degrees: float):
self._value = float(degrees) # % 360.0
def __str__(self):
x = self._value
return f'{_round_half_up(x, 4)}deg'
@property
def degrees(self) -> float:
""" Degrees. """
return self._value
class GradiansAngle(Angle):
""" An angle expressed in gradians.
A 565.5 gradians angle can be created the following way:
.. code-block:: python
angle = GradiansAngle(565.5)
:param gradians: Gradians; canonical values are between
0 and 400.0 excluded.
"""
__slots__ = ('_value')
_bottom = 0
_top = 400.0
def __init__(self, gradians: float):
self._value = float(gradians) # % 400.0
def __str__(self):
x = self._value
return f'{_round_half_up(x, 4)}grad'
@property
def gradians(self) -> float:
""" Gradians. """
return self._value
class RadiansAngle(Angle):
""" An angle expressed in radians.
A π radians angle can be created the following way:
.. code-block:: python
from math import pi
angle = RadiansAngle(pi)
:param radians: Radians; canonical are between 0 and 2π
excluded.
"""
__slots__ = ('_value')
_bottom = 0
_top = 2 * _pi
def __init__(self, radians: float):
self._value = float(radians) # % (2 * _pi)
def __str__(self):
x = self._value
return f'{int(x) if x == int(x) else x}rad'
def __repr__(self):
r = _round_half_up(self.radians / _pi, 4)
return f"{self.__class__.__name__}(radians={f'{r}π' if r else '0'})"
@property
def radians(self) -> float:
""" Radians. """
return self._value
class TurnsAngle(Angle):
""" An angle expressed in turns.
A 3.5 turns angle can be created the following way:
.. code-block:: python
angle = TurnsAngle(3.5)
:param turns: Turns; canonical values are between 0 and 1
excluded.
"""
__slots__ = ('_value')
_bottom = 0
_top = 1
def __init__(self, turns: float):
self._value = float(turns) # % 1.0
def __str__(self):
x = self._value
return f'{_round_half_up(x, 4)}turn'
@property
def turns(self) -> float:
""" Turns. """
return self._value
# End of file.
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