🌈️ apply a wallpaper based on the weather outside
feat: algorithm improvements
- use zenith and nadir to calculate max and min angles instead of 90°
- map hue along quintic curve
- adjust hue to use correct sunrise altitude -0.833 instead of 0
Angel Wang
(Jun 21, 2026, 12:52 PM -0600)
45ff987e
e14c9ae5
+27
-23
+2
-2
deno.json
+2
-2
deno.json
···
2
2
"tasks": {
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"compile-analyze": "deno compile --output build/analyze -A analyze/index.ts",
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"compile-apply": "deno compile --output build/apply -A apply/index.ts",
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-
"analyze": "deno run analyze/index.ts",
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"apply": "deno run apply/index.ts"
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+
"analyze": "deno run -A analyze/index.ts",
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"apply": "deno run -A apply/index.ts"
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},
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"imports": {
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"@std/assert": "jsr:@std/assert@1"
+4
-12
utils.ts
+4
-12
utils.ts
···
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return ((number - min) / (max - min)) * (newMax - newMin) + newMin
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}
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-
export function mapEaseInExpo(number: number, min: number, max: number, newMin: number, newMax: number) {
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-
return easeInExpo((number - min) / (max - min)) * (newMax - newMin) + newMin
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+
function easeOutQuint(x: number): number {
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return 1 - Math.pow(1 - x, 5)
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}
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-
export function mapEaseOutExpo(number: number, min: number, max: number, newMin: number, newMax: number) {
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-
return easeOutExpo((number - min) / (max - min)) * (newMax - newMin) + newMin
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}
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-
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function easeInExpo(x: number): number {
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return x === 0 ? 0 : Math.pow(2, 10 * x - 10)
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}
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-
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-
function easeOutExpo(x: number): number {
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-
return x === 1 ? 1 : 1 - Math.pow(2, -10 * x)
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export function mapEaseOutQuint(number: number, min: number, max: number, newMin: number, newMax: number) {
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+
return easeOutQuint((number - min) / (max - min)) * (newMax - newMin) + newMin
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}
+21
-9
apply/index.ts
+21
-9
apply/index.ts
···
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1
#!/usr/bin/env zx
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2
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3
import { ImageAnalysisData } from "../analyze/analysis.ts"
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-
import { cacheDir, configDir, loadConfig, map, mapEaseInExpo, mapEaseOutExpo } from "../utils.ts"
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+
import { cacheDir, configDir, loadConfig, map, mapEaseOutQuint } from "../utils.ts"
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import { ApplicationConfig, defaultConfig, findMatchingImages, getOpenMeteoData } from "./application.ts"
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import * as SunCalc from "suncalc"
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import "zx/globals"
···
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config.longitude,
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config.weatherModel,
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)
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-
const sunCalcData = SunCalc.getPosition(
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const currentSunData = SunCalc.getPosition(
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new Date(),
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+
config.latitude,
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config.longitude,
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)
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const zenithSunData = SunCalc.getPosition(
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SunCalc.getTimes(new Date(), config.latitude, config.longitude).solarNoon,
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+
config.latitude,
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config.longitude,
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)
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const nadirSunData = SunCalc.getPosition(
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SunCalc.getTimes(new Date(), config.latitude, config.longitude).nadir,
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config.latitude,
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config.longitude,
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)
···
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console.info(
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`Current shortwave radiation is ${openMeteoData.shortwaveRadiation} W/m²!`,
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)
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console.info(`Current sun altitude is ${sunCalcData.altitude}°!`)
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console.info(`Current sun altitude is ${currentSunData.altitude}°!`)
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const hueValue = Number(sunCalcData.altitude) >= 0
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? mapEaseOutExpo(Number(sunCalcData.altitude), 0, 90, 0, 264)
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: mapEaseInExpo(Number(sunCalcData.altitude), 0, -90, 360, 264)
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const hueValue = Number(currentSunData.altitude) >= -0.833
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? mapEaseOutQuint(Number(currentSunData.altitude), -0.833, zenithSunData.altitude, 0, 264)
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: mapEaseOutQuint(Number(currentSunData.altitude), nadirSunData.altitude, -0.833, 264, 360)
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+
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const chromaValue = map(
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-
Number(openMeteoData.cloudCover),
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+
100 - Number(openMeteoData.cloudCover), // gotta invert this one
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0,
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100,
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-
config.chromaRange.end,
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config.chromaRange.start,
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+
config.chromaRange.end,
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)
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+
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const lightnessValue = map(
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Number(openMeteoData.shortwaveRadiation),
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0,
···
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const targetFile = findMatchingImages(imagesData, hueValue, chromaValue, lightnessValue)
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-
console.info(`Found target image ${targetFile.path}!`)
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console.info(`Setting wallpaper...`)
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await $`eval ${config.applyWallpaperCommand.replace("%s", targetFile.path)}`
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+
console.info(`Success! Enjoy :)`)