Viewing file:  palette.py (3.32 KB) -rw-r--r--
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from math import sqrt
from functools import lru_cache
from typing import Sequence, Tuple, TYPE_CHECKING
from .color_triplet import ColorTriplet
if TYPE_CHECKING:
from pip._vendor.rich.table import Table
class Palette:
"""A palette of available colors."""
def __init__(self, colors: Sequence[Tuple[int, int, int]]):
self._colors = colors
def __getitem__(self, number: int) -> ColorTriplet:
return ColorTriplet(*self._colors[number])
def __rich__(self) -> "Table":
from pip._vendor.rich.color import Color
from pip._vendor.rich.style import Style
from pip._vendor.rich.text import Text
from pip._vendor.rich.table import Table
table = Table(
"index",
"RGB",
"Color",
title="Palette",
caption=f"{len(self._colors)} colors",
highlight=True,
caption_justify="right",
)
for index, color in enumerate(self._colors):
table.add_row(
str(index),
repr(color),
Text(" " * 16, style=Style(bgcolor=Color.from_rgb(*color))),
)
return table
# This is somewhat inefficient and needs caching
@lru_cache(maxsize=1024)
def match(self, color: Tuple[int, int, int]) -> int:
"""Find a color from a palette that most closely matches a given color.
Args:
color (Tuple[int, int, int]): RGB components in range 0 > 255.
Returns:
int: Index of closes matching color.
"""
red1, green1, blue1 = color
_sqrt = sqrt
get_color = self._colors.__getitem__
def get_color_distance(index: int) -> float:
"""Get the distance to a color."""
red2, green2, blue2 = get_color(index)
red_mean = (red1 + red2) // 2
red = red1 - red2
green = green1 - green2
blue = blue1 - blue2
return _sqrt(
(((512 + red_mean) * red * red) >> 8)
+ 4 * green * green
+ (((767 - red_mean) * blue * blue) >> 8)
)
min_index = min(range(len(self._colors)), key=get_color_distance)
return min_index
if __name__ == "__main__": # pragma: no cover
import colorsys
from typing import Iterable
from pip._vendor.rich.color import Color
from pip._vendor.rich.console import Console, ConsoleOptions
from pip._vendor.rich.segment import Segment
from pip._vendor.rich.style import Style
class ColorBox:
def __rich_console__(
self, console: Console, options: ConsoleOptions
) -> Iterable[Segment]:
height = console.size.height - 3
for y in range(0, height):
for x in range(options.max_width):
h = x / options.max_width
l = y / (height + 1)
r1, g1, b1 = colorsys.hls_to_rgb(h, l, 1.0)
r2, g2, b2 = colorsys.hls_to_rgb(h, l + (1 / height / 2), 1.0)
bgcolor = Color.from_rgb(r1 * 255, g1 * 255, b1 * 255)
color = Color.from_rgb(r2 * 255, g2 * 255, b2 * 255)
yield Segment("▄", Style(color=color, bgcolor=bgcolor))
yield Segment.line()
console = Console()
console.print(ColorBox())
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