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