| 1 |
const getBrightness = (color: string) => { |
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if (!isHex(color)) { |
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color = rgbaToHex(color) |
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} |
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|
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const r = parseInt(color.slice(1, 3), 16) |
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const g = parseInt(color.slice(3, 5), 16) |
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const b = parseInt(color.slice(5, 7), 16) |
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|
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return (r * 299 + g * 587 + b * 114) / 1000 |
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} |
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|
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function rgbStyleToHex(color: string | null): string | null { |
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if (!color || color.indexOf('rgb') < 0) { |
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return color |
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} |
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|
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if (color.charAt(0) == '#') { |
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return color |
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} |
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|
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const nums = /(.*?)rgb\((\d+),\s*(\d+),\s*(\d+)\)/i.exec(color), |
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r = parseInt(nums![2], 10).toString(16), |
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g = parseInt(nums![3], 10).toString(16), |
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b = parseInt(nums![4], 10).toString(16) |
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|
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return ( |
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'#' + |
| 29 |
((r.length == 1 ? '0' + r : r) + (g.length == 1 ? '0' + g : g) + (b.length == 1 ? '0' + b : b)) |
| 30 |
).toLowerCase() |
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} |
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|
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const rgbaToHex = (color: string) => { |
| 34 |
return `#${color |
| 35 |
.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/) |
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.slice(1) |
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.map((n, i) => |
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(i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)) |
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.toString(16) |
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.padStart(2, '0') |
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.replace('NaN', ''), |
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) |
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.join('')}` |
| 44 |
} |
| 45 |
|
| 46 |
const isHex = (color: string) => { |
| 47 |
return /^#([0-9a-f]{3}){1,2}$/i.test(color) |
| 48 |
} |
| 49 |
|
| 50 |
const isDark = (color: string) => { |
| 51 |
return getBrightness(color) < 128 |
| 52 |
} |
| 53 |
|
| 54 |
const isLight = (color: string) => { |
| 55 |
return getBrightness(color) > 128 |
| 56 |
} |
| 57 |
|
| 58 |
export { isLight, isDark, rgbStyleToHex } |
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|
