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Joe Davies
Data Visualization & GIS at Eurostat. Exploring new ways of making maps.
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34 stars
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interpolatePalette = (colors) => {
return (t) =>
d3.piecewise(d3.interpolateLab, colors)(Math.min(Math.max(0, t), 1));
}
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// Helper function to convert hex color to RGB
function hexToRgb(hex) {
let bigint = parseInt(hex.replace("#", ""), 16);
return [(bigint >> 16) & 255, (bigint >> 8) & 255, bigint & 255];
}
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// Helper function to calculate relative luminance
function relativeLuminance([r, g, b]) {
[r, g, b] = [r, g, b].map((v) => {
v /= 255;
return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4);
});
return 0.2126 * r + 0.7152 * g + 0.0722 * b;
}
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// Helper function to calculate contrast ratio
function contrastRatio(luminance1, luminance2) {
let lighter = Math.max(luminance1, luminance2);
let darker = Math.min(luminance1, luminance2);
return (lighter + 0.05) / (darker + 0.05);
}
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eurostatmap = require("eurostat-map")
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