@macrostrat/column-components/dist/chroma-js/src/io/temp/rgb2temperature.cjs

React rendering primitives for stratigraphic columns

"use strict";
const temperature2rgb = require("./temperature2rgb.cjs");
require("../../utils/type.cjs");
const unpack = require("../../utils/unpack.cjs");
const { round } = Math;
const rgb2temperature = (...args) => {
  const rgb = unpack(args, "rgb");
  const r = rgb[0], b = rgb[2];
  let minTemp = 1e3;
  let maxTemp = 4e4;
  const eps = 0.4;
  let temp;
  while (maxTemp - minTemp > eps) {
    temp = (maxTemp + minTemp) * 0.5;
    const rgb2 = temperature2rgb(temp);
    if (rgb2[2] / rgb2[0] >= b / r) {
      maxTemp = temp;
    } else {
      minTemp = temp;
    }
  }
  return round(temp);
};
module.exports = rgb2temperature;
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