Created
April 6, 2018 14:44
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hsl theme-color animartion
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta name="theme-color" content="#FF0000"> | |
| <script> | |
| // https://stackoverflow.com/a/44134328/4346956 | |
| // https://gordonlesti.com/change-theme-color-via-javascript/ | |
| function hslToHex(h, s, l) { | |
| h /= 360; | |
| s /= 100; | |
| l /= 100; | |
| let r, g, b; | |
| if (s === 0) { | |
| r = g = b = l; // achromatic | |
| } else { | |
| const hue2rgb = (p, q, t) => { | |
| if (t < 0) t += 1; | |
| if (t > 1) t -= 1; | |
| if (t < 1 / 6) return p + (q - p) * 6 * t; | |
| if (t < 1 / 2) return q; | |
| if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6; | |
| return p; | |
| }; | |
| const q = l < 0.5 ? l * (1 + s) : l + s - l * s; | |
| const p = 2 * l - q; | |
| r = hue2rgb(p, q, h + 1 / 3); | |
| g = hue2rgb(p, q, h); | |
| b = hue2rgb(p, q, h - 1 / 3); | |
| } | |
| const toHex = x => { | |
| const hex = Math.round(x * 255).toString(16); | |
| return hex.length === 1 ? '0' + hex : hex; | |
| }; | |
| return `#${toHex(r)}${toHex(g)}${toHex(b)}`; | |
| } | |
| var perc = 0; | |
| function colorChange() { | |
| console.log(perc); | |
| var metaThemeColor = document.querySelector("meta[name=theme-color]"); | |
| metaThemeColor.setAttribute("content", hslToHex(perc, 100, 50)); | |
| perc += (perc == 359) ? -359 : 1; | |
| requestAnimationFrame(colorChange); | |
| } | |
| requestAnimationFrame(colorChange); | |
| </script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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