Created
June 24, 2022 06:53
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| function clamp(rgb) { | |
| return rgb < 0 ? 0 : rgb > 255 ? 255 : parseInt(rgb); | |
| } | |
| function weatherTempToRGB(temp) { | |
| let r, g, b; | |
| if (temp >= 23) { | |
| let t = (temp - 23) / 27.0; | |
| g = (1 - t) * 200; | |
| r = 200 + t * 50; | |
| b = 0; | |
| } else { | |
| let t = (23 - temp) / 33.0; | |
| b = t * 200; | |
| g = Math.sqrt((1 - t) >= 0 ? 1 - t : 0) * 200; | |
| r = 220 - Math.sqrt(t / 2) * 200; | |
| } | |
| let mrgb = Math.max(clamp(r), clamp(g), clamp(b)); | |
| let cs = 224.0 / mrgb; | |
| return [clamp(r * cs), clamp(g * cs), clamp(b * cs)]; | |
| } | |
| function rgb(...values) { | |
| return values.reduce((acc, cur) => { | |
| let val = cur >= 255 ? 'ff' : cur <= 0 ? '00' : Number(cur).toString(16); | |
| return acc + (val.length === 1 ? '0' + val : val); | |
| }, '').toUpperCase(); | |
| } | |
| document.body.outerHTML = '<body style="display: flex; flex-flow: row wrap; height: auto"></body>'; | |
| for (let temp = -40; temp < 50; ++temp) { | |
| let [r, g, b] = weatherTempToRGB(temp); | |
| let tdiv = document.createElement('div'); | |
| tdiv.style.width = '7em'; | |
| tdiv.style.height = '2em'; | |
| tdiv.style.textAlign = 'center'; | |
| tdiv.style.backgroundColor = '#' + rgb(r, g, b); | |
| tdiv.textContent = temp + ': ' + '#' + rgb(r, g, b); | |
| document.body.appendChild(tdiv); | |
| } |
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