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hex-to-rgba.js
28 lines
| 1 | //hexカラーコード定義をrgbaに変換 |
| 2 | export default function hex2rgba(hex, alpha) { |
| 3 | // rgbaの場合は、そのまま返す（例：rgba( 255,255,255,0.1 )） |
| 4 | if (hex.substring(0, 4) === 'rgba') { |
| 5 | return hex; |
| 6 | } |
| 7 | // ロングバージョンの場合（例：#FF0000） |
| 8 | let r = hex.match(/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i); |
| 9 | let c = null; |
| 10 | if (r) { |
| 11 | c = r.slice(1, 4).map(function (x) { |
| 12 | return parseInt(x, 16); |
| 13 | }); |
| 14 | } |
| 15 | // ショートバージョンの場合（例：#F00） |
| 16 | r = hex.match(/^#([0-9a-f])([0-9a-f])([0-9a-f])$/i); |
| 17 | if (r) { |
| 18 | c = r.slice(1, 4).map(function (x) { |
| 19 | return 0x11 * parseInt(x, 16); |
| 20 | }); |
| 21 | } |
| 22 | // 該当しない場合は、nullを返す. |
| 23 | if (!c) { |
| 24 | return null; |
| 25 | } |
| 26 | return `rgba(${c[0]}, ${c[1]}, ${c[2]}, ${alpha})`; |
| 27 | } |
| 28 |