webui stuff

webui/src/helpers/kelvin.ts

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+// @ts-ignore
+import kelvinToRgb from "kelvin-to-rgb";
+import {ColorValue} from "../models/Colors";
+import iro from "@jaames/iro";
+
+export function kelvinToColorValue(rawKelvin: number): ColorValue {
+  const kelvin = normalizeKelvin(rawKelvin);
+
+  return kelvinTable[kelvin];
+}
+
+export function kelvinToRgbHex(rawKelvin: number): string {
+  const kelvin = normalizeKelvin(rawKelvin);
+
+  const c = new iro.Color();
+  c.kelvin = kelvin;
+
+  return c.hexString;
+}
+
+function normalizeKelvin(kelvin: number): number {
+  if (kelvin < 1000) {
+    return 1000;
+  } else if (kelvin > 10000) {
+    return 10000;
+  } else {
+    return kelvin - (kelvin % 100);
+  }
+}
+
+const kelvinTable: {[key: number]: ColorValue} = {};
+for (let kelvin = 1000; kelvin <= 10000; kelvin += 100) {
+  const c = new iro.Color();
+  c.kelvin = kelvin;
+
+  const [h, s] = [c.hsv.h, (c.hsv.s as number) / 100];
+
+  kelvinTable[kelvin] = {h, s, kelvin};
+}