moment/src/backend/color.py

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2020-11-17 02:08:56 +11:00
# Copyright Mirage authors & contributors <https://github.com/mirukana/mirage>
# SPDX-License-Identifier: LGPL-3.0-or-later
"""Provide the `Color` class and functions to easily construct a `Color`."""
import builtins
import colorsys
from copy import copy
from dataclasses import InitVar, dataclass, field
from typing import Optional, Tuple, Union
from hsluv import hex_to_hsluv, hsluv_to_hex, hsluv_to_rgb, rgb_to_hsluv
from .svg_colors import SVG_COLORS
HEX_TO_SVG = {v: k for k, v in SVG_COLORS.items()}
ColorTuple = Tuple[float, float, float, float]
@dataclass(repr=False)
class Color:
"""A color manipulable in HSLuv, HSL, RGB, hexadecimal and by SVG name.
The `Color` object constructor accepts hexadecimal string
("#RGB", "#RRGGBB" or "#RRGGBBAA"),
[CSS/SVG named colors](https://www.december.com/html/spec/colorsvg.html),
or another `Color` to copy.
Attributes representing the color in HSLuv, HSL, RGB and hexadecimal
formats can be accessed and modified on these `Color` objects.
The `hsluv()`/`hsluva()`, `hsl()`/`hsla()` and `rgb()`/`rgba()`
functions in this module are provided to create an object by specifying
a color in other formats.
Copies of objects with modified attributes can be created with the
with the `Color.but()`, `Color.plus()` and `Copy.times()` methods.
If the `hue` is outside of the normal 0-359 range, the number is
interpreted as `hue % 360`, e.g. `360` is `0`, `460` is `100`,
or `-20` is `340`.
"""
# The saturation and luv are properties due to the need for a setter
# capping the value between 0-100, as hsluv handles numbers outside
# this range incorrectly.
color_hex_or_name: InitVar[str] = "black"
hue: float = field(init=False, default=0)
_saturation: float = field(init=False, default=0)
_luv: float = field(init=False, default=0)
alpha: float = field(init=False, default=1)
def __post_init__(self, color_hex_or_name: Union["Color", str]) -> None:
if isinstance(color_hex_or_name, Color):
hsluva = color_hex_or_name.hsluva
self.hue, self.saturation, self.luv, self.alpha = hsluva
elif color_hex_or_name.startswith("#"):
self.hex = color_hex_or_name
else:
self.name = color_hex_or_name
# HSLuv
@property
def hsluva(self) -> ColorTuple:
return (self.hue, self.saturation, self.luv, self.alpha)
@hsluva.setter
def hsluva(self, value: ColorTuple) -> None:
self.hue, self.saturation, self.luv, self.alpha = value
@property
def saturation(self) -> float:
return self._saturation
@saturation.setter
def saturation(self, value: float) -> None:
self._saturation = max(0, min(100, value))
@property
def luv(self) -> float:
return self._luv
@luv.setter
def luv(self, value: float) -> None:
self._luv = max(0, min(100, value))
# HSL
@property
def hsla(self) -> ColorTuple:
r, g, b = (self.red / 255, self.green / 255, self.blue / 255)
h, l, s = colorsys.rgb_to_hls(r, g, b)
return (h * 360, s * 100, l * 100, self.alpha)
@hsla.setter
def hsla(self, value: ColorTuple) -> None:
h, s, l = (value[0] / 360, value[1] / 100, value[2] / 100) # noqa
r, g, b = colorsys.hls_to_rgb(h, l, s)
self.rgba = (r * 255, g * 255, b * 255, value[3])
@property
def light(self) -> float:
return self.hsla[2]
@light.setter
def light(self, value: float) -> None:
self.hsla = (self.hue, self.saturation, value, self.alpha)
# RGB
@property
def rgba(self) -> ColorTuple:
r, g, b = hsluv_to_rgb(self.hsluva)
return r * 255, g * 255, b * 255, self.alpha
@rgba.setter
def rgba(self, value: ColorTuple) -> None:
r, g, b = (value[0] / 255, value[1] / 255, value[2] / 255)
self.hsluva = rgb_to_hsluv((r, g, b)) + (self.alpha,)
@property
def red(self) -> float:
return self.rgba[0]
@red.setter
def red(self, value: float) -> None:
self.rgba = (value, self.green, self.blue, self.alpha)
@property
def green(self) -> float:
return self.rgba[1]
@green.setter
def green(self, value: float) -> None:
self.rgba = (self.red, value, self.blue, self.alpha)
@property
def blue(self) -> float:
return self.rgba[2]
@blue.setter
def blue(self, value: float) -> None:
self.rgba = (self.red, self.green, value, self.alpha)
# Hexadecimal
@property
def hex(self) -> str:
rgb = hsluv_to_hex(self.hsluva)
alpha = builtins.hex(int(self.alpha * 255))[2:]
return f"{rgb}{alpha if self.alpha < 1 else ''}".lower()
@hex.setter
def hex(self, value: str) -> None:
if len(value) == 4:
template = "#{r}{r}{g}{g}{b}{b}"
value = template.format(r=value[1], g=value[2], b=value[3])
alpha = int(value[-2:] if len(value) == 9 else "ff", 16) / 255
self.hsluva = hex_to_hsluv(value) + (alpha,)
# name color
@property
def name(self) -> Optional[str]:
return HEX_TO_SVG.get(self.hex)
@name.setter
def name(self, value: str) -> None:
self.hex = SVG_COLORS[value.lower()]
# Other methods
def __repr__(self) -> str:
r, g, b = int(self.red), int(self.green), int(self.blue)
h, s, luv = int(self.hue), int(self.saturation), int(self.luv)
l = int(self.light) # noqa
a = self.alpha
block = f"\x1b[38;2;{r};{g};{b}m█████\x1b[0m"
sep = "\x1b[1;33m/\x1b[0m"
end = f" {sep} {self.name}" if self.name else ""
# Need a terminal with true color support to render the block!
return (
f"{block} hsluva({h}, {s}, {luv}, {a}) {sep} "
f"hsla({h}, {s}, {l}, {a}) {sep} rgba({r}, {g}, {b}, {a}) {sep} "
f"{self.hex}{end}"
)
def but(
self,
hue: Optional[float] = None,
saturation: Optional[float] = None,
luv: Optional[float] = None,
alpha: Optional[float] = None,
*,
hsluva: Optional[ColorTuple] = None,
hsla: Optional[ColorTuple] = None,
rgba: Optional[ColorTuple] = None,
hex: Optional[str] = None,
name: Optional[str] = None,
light: Optional[float] = None,
red: Optional[float] = None,
green: Optional[float] = None,
blue: Optional[float] = None,
) -> "Color":
"""Return a copy of this `Color` with overriden attributes.
Example:
>>> first = Color(100, 50, 50)
>>> second = c.but(hue=20, saturation=100)
>>> second.hsluva
(20, 50, 100, 1)
"""
new = copy(self)
for arg, value in locals().items():
if arg not in ("new", "self") and value is not None:
setattr(new, arg, value)
return new
def plus(
self,
hue: Optional[float] = None,
saturation: Optional[float] = None,
luv: Optional[float] = None,
alpha: Optional[float] = None,
*,
light: Optional[float] = None,
red: Optional[float] = None,
green: Optional[float] = None,
blue: Optional[float] = None,
) -> "Color":
"""Return a copy of this `Color` with values added to attributes.
Example:
>>> first = Color(100, 50, 50)
>>> second = c.plus(hue=10, saturation=-20)
>>> second.hsluva
(110, 30, 50, 1)
"""
new = copy(self)
for arg, value in locals().items():
if arg not in ("new", "self") and value is not None:
setattr(new, arg, getattr(self, arg) + value)
return new
def times(
self,
hue: Optional[float] = None,
saturation: Optional[float] = None,
luv: Optional[float] = None,
alpha: Optional[float] = None,
*,
light: Optional[float] = None,
red: Optional[float] = None,
green: Optional[float] = None,
blue: Optional[float] = None,
) -> "Color":
"""Return a copy of this `Color` with multiplied attributes.
Example:
>>> first = Color(100, 50, 50, 0.8)
>>> second = c.times(luv=2, alpha=0.5)
>>> second.hsluva
(100, 50, 100, 0.4)
"""
new = copy(self)
for arg, value in locals().items():
if arg not in ("new", "self") and value is not None:
setattr(new, arg, getattr(self, arg) * value)
return new
def hsluva(
hue: float = 0, saturation: float = 0, luv: float = 0, alpha: float = 1,
) -> Color:
"""Return a `Color` from `(0-359, 0-100, 0-100, 0-1)` HSLuv arguments."""
return Color().but(hue, saturation, luv, alpha)
def hsla(
hue: float = 0, saturation: float = 0, light: float = 0, alpha: float = 1,
) -> Color:
"""Return a `Color` from `(0-359, 0-100, 0-100, 0-1)` HSL arguments."""
return Color().but(hue, saturation, light=light, alpha=alpha)
def rgba(
red: float = 0, green: float = 0, blue: float = 0, alpha: float = 1,
) -> Color:
"""Return a `Color` from `(0-255, 0-255, 0-255, 0-1)` RGB arguments."""
return Color().but(red=red, green=green, blue=blue, alpha=alpha)
color = Color
hsluv = hsluva
hsl = hsla
rgb = rgba