Add color.py module for theming
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miruka
310
src/backend/color.py
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310
src/backend/color.py
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# Copyright Mirage authors & contributors <https://github.com/mirukana/mirage>
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# SPDX-License-Identifier: LGPL-3.0-or-later
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"""Provide the `Color` class and functions to easily construct a `Color`."""
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import builtins
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import colorsys
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from copy import copy
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from dataclasses import InitVar, dataclass, field
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from typing import Optional, Tuple, Union
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from hsluv import hex_to_hsluv, hsluv_to_hex, hsluv_to_rgb, rgb_to_hsluv
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from .svg_colors import SVG_COLORS
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HEX_TO_SVG = {v: k for k, v in SVG_COLORS.items()}
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ColorTuple = Tuple[float, float, float, float]
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@dataclass(repr=False)
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class Color:
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"""A color manipulable in HSLuv, HSL, RGB, hexadecimal and by SVG name.
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The `Color` object constructor accepts hexadecimal string
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("#RGB", "#RRGGBB" or "#RRGGBBAA"),
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[CSS/SVG named colors](https://www.december.com/html/spec/colorsvg.html),
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or another `Color` to copy.
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Attributes representing the color in HSLuv, HSL, RGB and hexadecimal
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formats can be accessed and modified on these `Color` objects.
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The `hsluv()`/`hsluva()`, `hsl()`/`hsla()` and `rgb()`/`rgba()`
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functions in this module are provided to create an object by specifying
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a color in other formats.
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Copies of objects with modified attributes can be created with the
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with the `Color.but()`, `Color.plus()` and `Copy.times()` methods.
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If the `hue` is outside of the normal 0-359 range, the number is
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interpreted as `hue % 360`, e.g. `360` is `0`, `460` is `100`,
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or `-20` is `340`.
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"""
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# The saturation and luv are properties due to the need for a setter
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# capping the value between 0-100, as hsluv handles numbers outside
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# this range incorrectly.
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color_hex_or_name: InitVar[str] = "black"
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hue: float = field(init=False, default=0)
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_saturation: float = field(init=False, default=0)
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_luv: float = field(init=False, default=0)
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alpha: float = field(init=False, default=1)
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def __post_init__(self, color_hex_or_name: Union["Color", str]) -> None:
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if isinstance(color_hex_or_name, Color):
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hsluva = color_hex_or_name.hsluva
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self.hue, self.saturation, self.luv, self.alpha = hsluva
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elif color_hex_or_name.startswith("#"):
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self.hex = color_hex_or_name
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else:
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self.name = color_hex_or_name
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# HSLuv
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@property
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def hsluva(self) -> ColorTuple:
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return (self.hue, self.saturation, self.luv, self.alpha)
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@hsluva.setter
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def hsluva(self, value: ColorTuple) -> None:
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self.hue, self.saturation, self.luv, self.alpha = value
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@property
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def saturation(self) -> float:
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return self._saturation
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@saturation.setter
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def saturation(self, value: float) -> None:
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self._saturation = max(0, min(100, value))
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@property
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def luv(self) -> float:
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return self._luv
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@luv.setter
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def luv(self, value: float) -> None:
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self._luv = max(0, min(100, value))
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# HSL
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@property
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def hsla(self) -> ColorTuple:
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r, g, b = (self.red / 255, self.green / 255, self.blue / 255)
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h, l, s = colorsys.rgb_to_hls(r, g, b)
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return (h * 360, s * 100, l * 100, self.alpha)
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@hsla.setter
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def hsla(self, value: ColorTuple) -> None:
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h, s, l = (value[0] / 360, value[1] / 100, value[2] / 100) # noqa
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r, g, b = colorsys.hls_to_rgb(h, l, s)
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self.rgba = (r * 255, g * 255, b * 255, value[3])
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@property
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def light(self) -> float:
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return self.hsla[2]
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@light.setter
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def light(self, value: float) -> None:
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self.hsla = (self.hue, self.saturation, value, self.alpha)
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# RGB
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@property
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def rgba(self) -> ColorTuple:
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r, g, b = hsluv_to_rgb(self.hsluva)
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return r * 255, g * 255, b * 255, self.alpha
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@rgba.setter
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def rgba(self, value: ColorTuple) -> None:
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r, g, b = (value[0] / 255, value[1] / 255, value[2] / 255)
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self.hsluva = rgb_to_hsluv((r, g, b)) + (self.alpha,)
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@property
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def red(self) -> float:
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return self.rgba[0]
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@red.setter
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def red(self, value: float) -> None:
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self.rgba = (value, self.green, self.blue, self.alpha)
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@property
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def green(self) -> float:
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return self.rgba[1]
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@green.setter
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def green(self, value: float) -> None:
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self.rgba = (self.red, value, self.blue, self.alpha)
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@property
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def blue(self) -> float:
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return self.rgba[2]
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@blue.setter
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def blue(self, value: float) -> None:
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self.rgba = (self.red, self.green, value, self.alpha)
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# Hexadecimal
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@property
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def hex(self) -> str:
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rgb = hsluv_to_hex(self.hsluva)
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alpha = builtins.hex(int(self.alpha * 255))[2:]
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return f"{rgb}{alpha if self.alpha < 1 else ''}".lower()
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@hex.setter
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def hex(self, value: str) -> None:
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if len(value) == 4:
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template = "#{r}{r}{g}{g}{b}{b}"
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value = template.format(r=value[1], g=value[2], b=value[3])
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alpha = int(value[-2:] if len(value) == 9 else "ff", 16) / 255
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self.hsluva = hex_to_hsluv(value) + (alpha,)
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# name color
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@property
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def name(self) -> Optional[str]:
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return HEX_TO_SVG.get(self.hex)
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@name.setter
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def name(self, value: str) -> None:
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self.hex = SVG_COLORS[value.lower()]
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# Other methods
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def __repr__(self) -> str:
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r, g, b = int(self.red), int(self.green), int(self.blue)
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h, s, luv = int(self.hue), int(self.saturation), int(self.luv)
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l = int(self.light) # noqa
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a = self.alpha
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block = f"\x1b[38;2;{r};{g};{b}m█████\x1b[0m"
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sep = "\x1b[1;33m/\x1b[0m"
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end = f" {sep} {self.name}" if self.name else ""
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# Need a terminal with true color support to render the block!
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return (
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f"{block} hsluva({h}, {s}, {luv}, {a}) {sep} "
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f"hsla({h}, {s}, {l}, {a}) {sep} rgba({r}, {g}, {b}, {a}) {sep} "
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f"{self.hex}{end}"
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)
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def but(
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self,
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hue: Optional[float] = None,
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saturation: Optional[float] = None,
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luv: Optional[float] = None,
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alpha: Optional[float] = None,
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*,
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hsluva: Optional[ColorTuple] = None,
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hsla: Optional[ColorTuple] = None,
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rgba: Optional[ColorTuple] = None,
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hex: Optional[str] = None,
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name: Optional[str] = None,
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light: Optional[float] = None,
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red: Optional[float] = None,
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green: Optional[float] = None,
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blue: Optional[float] = None,
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) -> "Color":
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"""Return a copy of this `Color` with overriden attributes.
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Example:
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>>> first = Color(100, 50, 50)
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>>> second = c.but(hue=20, saturation=100)
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>>> second.hsluva
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(20, 50, 100, 1)
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"""
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new = copy(self)
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for arg, value in locals().items():
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if arg not in ("new", "self") and value is not None:
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setattr(new, arg, value)
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return new
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def plus(
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self,
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hue: Optional[float] = None,
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saturation: Optional[float] = None,
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luv: Optional[float] = None,
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alpha: Optional[float] = None,
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*,
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light: Optional[float] = None,
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red: Optional[float] = None,
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green: Optional[float] = None,
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blue: Optional[float] = None,
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) -> "Color":
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"""Return a copy of this `Color` with values added to attributes.
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Example:
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>>> first = Color(100, 50, 50)
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>>> second = c.plus(hue=10, saturation=-20)
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>>> second.hsluva
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(110, 30, 50, 1)
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"""
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new = copy(self)
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for arg, value in locals().items():
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if arg not in ("new", "self") and value is not None:
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setattr(new, arg, getattr(self, arg) + value)
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return new
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def times(
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self,
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hue: Optional[float] = None,
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saturation: Optional[float] = None,
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luv: Optional[float] = None,
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alpha: Optional[float] = None,
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*,
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light: Optional[float] = None,
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red: Optional[float] = None,
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green: Optional[float] = None,
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blue: Optional[float] = None,
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) -> "Color":
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"""Return a copy of this `Color` with multiplied attributes.
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Example:
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>>> first = Color(100, 50, 50, 0.8)
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>>> second = c.times(luv=2, alpha=0.5)
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>>> second.hsluva
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(100, 50, 100, 0.4)
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"""
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new = copy(self)
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for arg, value in locals().items():
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if arg not in ("new", "self") and value is not None:
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setattr(new, arg, getattr(self, arg) * value)
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return new
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def hsluva(
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hue: float = 0, saturation: float = 0, luv: float = 0, alpha: float = 1,
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) -> Color:
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"""Return a `Color` from `(0-359, 0-100, 0-100, 0-1)` HSLuv arguments."""
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return Color().but(hue, saturation, luv, alpha)
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def hsla(
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hue: float = 0, saturation: float = 0, light: float = 0, alpha: float = 1,
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) -> Color:
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"""Return a `Color` from `(0-359, 0-100, 0-100, 0-1)` HSL arguments."""
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return Color().but(hue, saturation, light=light, alpha=alpha)
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def rgba(
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red: float = 0, green: float = 0, blue: float = 0, alpha: float = 1,
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) -> Color:
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"""Return a `Color` from `(0-255, 0-255, 0-255, 0-1)` RGB arguments."""
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return Color().but(red=red, green=green, blue=blue, alpha=alpha)
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color = Color
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hsluv = hsluva
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hsl = hsla
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rgb = rgba
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