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import re
import random
from colorsys import hls_to_rgb
from typing import NamedTuple
import streamlit as st
import wcag_contrast_ratio as contrast
class ThemeColor(NamedTuple):
primaryColor: str
backgroundColor: str
secondaryBackgroundColor: str
textColor: str
@st.cache_resource
def get_config_theme_color():
config_theme_primaryColor = st._config.get_option('theme.primaryColor')
config_theme_backgroundColor = st._config.get_option('theme.backgroundColor')
config_theme_secondaryBackgroundColor = st._config.get_option('theme.secondaryBackgroundColor')
config_theme_textColor = st._config.get_option('theme.textColor')
if config_theme_primaryColor and config_theme_backgroundColor and config_theme_secondaryBackgroundColor and config_theme_textColor:
return ThemeColor(
primaryColor=config_theme_primaryColor,
backgroundColor=config_theme_backgroundColor,
secondaryBackgroundColor=config_theme_secondaryBackgroundColor,
textColor=config_theme_textColor,
)
return None
def parse_hex(rgb_hex_str: str) -> tuple[float, float, float]:
if not re.match(r"^#[0-9a-fA-F]{6}$", rgb_hex_str):
raise ValueError("Invalid hex color")
return tuple(int(rgb_hex_str[i:i+2], 16) / 255 for i in (1, 3, 5))
def random_hls():
h = random.random()
l = random.random()
s = random.random()
# Make sure the color is light or dark enough.
MAX_LIGHTNESS = 0.3
if l < 0.5:
# Make the color darker.
l = l * (MAX_LIGHTNESS / 0.5)
else:
# Make the color lighter.
l = 1 - l
l = l * (MAX_LIGHTNESS / 0.5)
l = 1 - l
return (h, l, s)
def high_contrast_color(color):
h, l, s = color
l = 1 - l
return (h, l, s)
def hls_to_hex(color):
r, g, b = hls_to_rgb(*color)
return "#{:02x}{:02x}{:02x}".format(round(r * 255), round(g * 255), round(b * 255))
def find_color_with_contrast(base_color, min_contrast_ratio, max_attempts):
for _ in range(max_attempts):
candidate_color = random_hls()
if contrast.rgb(hls_to_rgb(*candidate_color), hls_to_rgb(*base_color)) > min_contrast_ratio:
return candidate_color
return high_contrast_color(base_color)
def generate_color_scheme():
primary_color = random_hls()
basic_background = high_contrast_color(primary_color)
text_color = find_color_with_contrast(basic_background, 7, 100)
secondary_background = find_color_with_contrast(primary_color, 7, 100)
return hls_to_hex(primary_color), hls_to_hex(text_color), hls_to_hex(basic_background), hls_to_hex(secondary_background)
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