Kevin Zakka
146a5c08f7
This resulted from a lengthy collaboration with @kevinzakka, @jonathanembleyriches, @nimrod-gileadi, @gizemozd, @quagla, and @yuval.
42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
import math
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from plotly import offline as plt_offline
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def plotly_script_tag() -> str:
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"""
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Returns an HTML <script> tag for importing the specific version of Plotly
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currently installed in the environment.
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"""
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plotly_js_version = plt_offline.get_plotlyjs_version()
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return (
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f'<script src="https://cdn.plot.ly/plotly-{plotly_js_version}.min.js"></script>'
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)
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def get_text_color(bg_color_hex: str) -> str:
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"""
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Determines whether text should be 'black' or 'white' based on the
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luminance of the given background hex color.
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Useful for heatmaps and colored data tables.
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"""
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# Convert hex to RGB
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hex_color = bg_color_hex.lstrip("#")
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if len(hex_color) != 6:
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return "black" # Fallback
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rgb = tuple(int(hex_color[i : i + 2], 16) for i in (0, 2, 4))
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r, g, b = [x / 255.0 for x in rgb]
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# Calculate luminance (per WCAG guidelines)
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# https://www.w3.org/TR/WCAG20/#relativeluminancedef
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def lum_component(c):
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return c / 12.92 if c <= 0.03928 else math.pow((c + 0.055) / 1.055, 2.4)
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luminance = (
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0.2126 * lum_component(r) + 0.7152 * lum_component(g) + 0.0722 * lum_component(b)
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)
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# Return 'black' for light backgrounds, 'white' for dark backgrounds
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return "black" if luminance > 0.4 else "white"
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