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275 lines
7.9 KiB
275 lines
7.9 KiB
from __future__ import annotations
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import itertools
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from typing import (
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TYPE_CHECKING,
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Collection,
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Iterator,
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Sequence,
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Union,
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cast,
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)
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import warnings
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import matplotlib.cm as cm
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import matplotlib.colors
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import numpy as np
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from pandas.core.dtypes.common import is_list_like
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import pandas.core.common as com
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if TYPE_CHECKING:
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from matplotlib.colors import Colormap
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Color = Union[str, Sequence[float]]
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def get_standard_colors(
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num_colors: int,
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colormap: Colormap | None = None,
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color_type: str = "default",
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color: dict[str, Color] | Color | Collection[Color] | None = None,
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):
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"""
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Get standard colors based on `colormap`, `color_type` or `color` inputs.
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Parameters
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----------
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num_colors : int
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Minimum number of colors to be returned.
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Ignored if `color` is a dictionary.
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colormap : :py:class:`matplotlib.colors.Colormap`, optional
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Matplotlib colormap.
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When provided, the resulting colors will be derived from the colormap.
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color_type : {"default", "random"}, optional
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Type of colors to derive. Used if provided `color` and `colormap` are None.
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Ignored if either `color` or `colormap` are not None.
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color : dict or str or sequence, optional
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Color(s) to be used for deriving sequence of colors.
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Can be either be a dictionary, or a single color (single color string,
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or sequence of floats representing a single color),
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or a sequence of colors.
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Returns
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-------
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dict or list
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Standard colors. Can either be a mapping if `color` was a dictionary,
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or a list of colors with a length of `num_colors` or more.
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Warns
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-----
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UserWarning
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If both `colormap` and `color` are provided.
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Parameter `color` will override.
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"""
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if isinstance(color, dict):
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return color
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colors = _derive_colors(
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color=color,
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colormap=colormap,
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color_type=color_type,
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num_colors=num_colors,
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)
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return list(_cycle_colors(colors, num_colors=num_colors))
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def _derive_colors(
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*,
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color: Color | Collection[Color] | None,
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colormap: str | Colormap | None,
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color_type: str,
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num_colors: int,
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) -> list[Color]:
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"""
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Derive colors from either `colormap`, `color_type` or `color` inputs.
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Get a list of colors either from `colormap`, or from `color`,
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or from `color_type` (if both `colormap` and `color` are None).
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Parameters
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----------
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color : str or sequence, optional
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Color(s) to be used for deriving sequence of colors.
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Can be either be a single color (single color string, or sequence of floats
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representing a single color), or a sequence of colors.
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colormap : :py:class:`matplotlib.colors.Colormap`, optional
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Matplotlib colormap.
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When provided, the resulting colors will be derived from the colormap.
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color_type : {"default", "random"}, optional
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Type of colors to derive. Used if provided `color` and `colormap` are None.
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Ignored if either `color` or `colormap`` are not None.
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num_colors : int
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Number of colors to be extracted.
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Returns
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-------
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list
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List of colors extracted.
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Warns
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-----
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UserWarning
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If both `colormap` and `color` are provided.
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Parameter `color` will override.
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"""
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if color is None and colormap is not None:
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return _get_colors_from_colormap(colormap, num_colors=num_colors)
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elif color is not None:
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if colormap is not None:
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warnings.warn(
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"'color' and 'colormap' cannot be used simultaneously. Using 'color'"
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)
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return _get_colors_from_color(color)
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else:
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return _get_colors_from_color_type(color_type, num_colors=num_colors)
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def _cycle_colors(colors: list[Color], num_colors: int) -> Iterator[Color]:
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"""Cycle colors until achieving max of `num_colors` or length of `colors`.
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Extra colors will be ignored by matplotlib if there are more colors
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than needed and nothing needs to be done here.
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"""
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max_colors = max(num_colors, len(colors))
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yield from itertools.islice(itertools.cycle(colors), max_colors)
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def _get_colors_from_colormap(
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colormap: str | Colormap,
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num_colors: int,
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) -> list[Color]:
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"""Get colors from colormap."""
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colormap = _get_cmap_instance(colormap)
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return [colormap(num) for num in np.linspace(0, 1, num=num_colors)]
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def _get_cmap_instance(colormap: str | Colormap) -> Colormap:
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"""Get instance of matplotlib colormap."""
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if isinstance(colormap, str):
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cmap = colormap
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colormap = cm.get_cmap(colormap)
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if colormap is None:
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raise ValueError(f"Colormap {cmap} is not recognized")
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return colormap
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def _get_colors_from_color(
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color: Color | Collection[Color],
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) -> list[Color]:
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"""Get colors from user input color."""
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if len(color) == 0:
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raise ValueError(f"Invalid color argument: {color}")
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if _is_single_color(color):
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color = cast(Color, color)
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return [color]
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color = cast(Collection[Color], color)
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return list(_gen_list_of_colors_from_iterable(color))
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def _is_single_color(color: Color | Collection[Color]) -> bool:
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"""Check if `color` is a single color, not a sequence of colors.
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Single color is of these kinds:
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- Named color "red", "C0", "firebrick"
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- Alias "g"
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- Sequence of floats, such as (0.1, 0.2, 0.3) or (0.1, 0.2, 0.3, 0.4).
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See Also
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--------
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_is_single_string_color
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"""
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if isinstance(color, str) and _is_single_string_color(color):
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# GH #36972
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return True
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if _is_floats_color(color):
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return True
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return False
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def _gen_list_of_colors_from_iterable(color: Collection[Color]) -> Iterator[Color]:
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"""
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Yield colors from string of several letters or from collection of colors.
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"""
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for x in color:
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if _is_single_color(x):
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yield x
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else:
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raise ValueError(f"Invalid color {x}")
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def _is_floats_color(color: Color | Collection[Color]) -> bool:
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"""Check if color comprises a sequence of floats representing color."""
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return bool(
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is_list_like(color)
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and (len(color) == 3 or len(color) == 4)
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and all(isinstance(x, (int, float)) for x in color)
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)
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def _get_colors_from_color_type(color_type: str, num_colors: int) -> list[Color]:
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"""Get colors from user input color type."""
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if color_type == "default":
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return _get_default_colors(num_colors)
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elif color_type == "random":
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return _get_random_colors(num_colors)
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else:
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raise ValueError("color_type must be either 'default' or 'random'")
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def _get_default_colors(num_colors: int) -> list[Color]:
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"""Get `num_colors` of default colors from matplotlib rc params."""
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import matplotlib.pyplot as plt
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colors = [c["color"] for c in plt.rcParams["axes.prop_cycle"]]
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return colors[0:num_colors]
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def _get_random_colors(num_colors: int) -> list[Color]:
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"""Get `num_colors` of random colors."""
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return [_random_color(num) for num in range(num_colors)]
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def _random_color(column: int) -> list[float]:
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"""Get a random color represented as a list of length 3"""
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# GH17525 use common._random_state to avoid resetting the seed
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rs = com.random_state(column)
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return rs.rand(3).tolist()
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def _is_single_string_color(color: Color) -> bool:
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"""Check if `color` is a single string color.
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Examples of single string colors:
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- 'r'
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- 'g'
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- 'red'
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- 'green'
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- 'C3'
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- 'firebrick'
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Parameters
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----------
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color : Color
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Color string or sequence of floats.
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Returns
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-------
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bool
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True if `color` looks like a valid color.
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False otherwise.
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"""
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conv = matplotlib.colors.ColorConverter()
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try:
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conv.to_rgba(color)
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except ValueError:
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return False
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else:
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return True
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