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Versions: 73
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Stored size: 1.14 KB
Contents
function isDark(color) {
// Variables for red, green, blue values
let r;
let g;
let b;
let hsp;
// If hex --> Convert it to RGB: http://gist.github.com/983661
color = +`0x${color.slice(1).replace(color.length < 5 && /./g, "$&$&")}`;
r = color >> 16;
g = (color >> 8) & 255;
b = color & 255;
// HSP equation from http://alienryderflex.com/hsp.html
hsp = Math.sqrt(0.299 * (r * r) + 0.587 * (g * g) + 0.114 * (b * b));
// Using the HSP value, determine whether the color is light or dark
if (hsp > 127.5) {
return false; // light
}
return true; // dark
}
function isLight(color) {
return !isDark(color);
}
function isValidHex(color) {
if (!color || typeof color !== "string") return false;
if (color.substring(0, 1) === "#") color = color.substring(1);
switch (color.length) {
case 3:
return /^[0-9A-F]{3}$/i.test(color);
case 6:
return /^[0-9A-F]{6}$/i.test(color);
case 8:
return /^[0-9A-F]{8}$/i.test(color);
default:
return false;
}
}
function formatHex(str) {
return `#${str.toUpperCase().replace("#", "")}`;
}
export { isLight, isDark, isValidHex, formatHex };
Version data entries
73 entries across 73 versions & 1 rubygems