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feat(utils.colors): golden_angle_color utility can return colors as a list of QColor, RGB or HEC

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wyzula-jan
2024-02-16 20:16:19 +01:00
parent 8a4aeb8dfe
commit 51259097fa
1 changed files with 26 additions and 11 deletions
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37
bec_widgets/utils/colors.py
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@ -1,6 +1,8 @@
from typing import Literal
import numpy as np
import pyqtgraph as pg
from pyqtgraph import mkColor
from qtpy.QtGui import QColor
class Colors:
@ -10,6 +12,9 @@ class Colors:
Args:
num (int): Number of angles
Returns:
list: List of angles calculated using the golden ratio.
"""
phi = 2 * np.pi * ((1 + np.sqrt(5)) / 2)
angles = []
@ -21,30 +26,40 @@ class Colors:
return angles
@staticmethod
def golden_angle_color(colormap: str, num: int) -> list:
def golden_angle_color(
colormap: str, num: int, format: Literal["QColor", "HEX", "RGB"] = "QColor"
) -> list:
"""
Extract num colors for from the specified colormap following golden angle distribution.
Extract num colors from the specified colormap following golden angle distribution and return them in the specified format.
Args:
colormap (str): Name of the colormap
num (int): Number of requested colors
colormap (str): Name of the colormap.
num (int): Number of requested colors.
format (Literal["QColor","HEX","RGB"]): The format of the returned colors ('RGB', 'HEX', 'QColor').
Returns:
list: List of colors with length <num>
list: List of colors in the specified format.
Raises:
ValueError: If the number of requested colors is greater than the number of colors in the colormap.
"""
cmap = pg.colormap.get(colormap)
cmap_colors = cmap.color
cmap_colors = cmap.getColors(mode="float")
if num > len(cmap_colors):
raise ValueError(
f"Number of colors requested ({num}) is greater than the number of colors in the colormap ({len(cmap_colors)})"
)
angles = Colors.golden_ratio(len(cmap_colors))
color_selection = np.round(np.interp(angles, (-np.pi, np.pi), (0, len(cmap_colors))))
colors = [
mkColor(tuple((cmap_colors[int(ii)] * 255).astype(int))) for ii in color_selection[:num]
]
colors = []
for ii in color_selection[:num]:
color = cmap_colors[int(ii)]
if format.upper() == "HEX":
colors.append(QColor.fromRgbF(*color).name())
elif format.upper() == "RGB":
colors.append(tuple((np.array(color) * 255).astype(int)))
elif format.upper() == "QCOLOR":
colors.append(QColor.fromRgbF(*color))
else:
raise ValueError("Unsupported format. Please choose 'RGB', 'HEX', or 'QColor'.")
return colors