jtBaseApp/node_modules/@esri/calcite-components/dist/collection/components/avatar/utils.js

/*!
 * All material copyright ESRI, All Rights Reserved, unless otherwise specified.
 * See https://github.com/Esri/calcite-components/blob/master/LICENSE.md for details.
 * v1.0.0-beta.97
 */
import { hexToRGB } from "../color-picker/utils";
/**
 * Convert a string to a valid hex by hashing its contents
 * and using the hash as a seed for three distinct color values
 *
 * @param str
 */
export function stringToHex(str) {
  let hash = 0;
  for (let i = 0; i < str.length; i++) {
    hash = str.charCodeAt(i) + ((hash << 5) - hash);
  }
  let hex = "#";
  for (let j = 0; j < 3; j++) {
    const value = (hash >> (j * 8)) & 0xff;
    hex += ("00" + value.toString(16)).substr(-2);
  }
  return hex;
}
/**
 * Find the hue of a color given the separate RGB color channels
 *
 * @param rgb
 */
export function rgbToHue(rgb) {
  let { r, g, b } = rgb;
  r /= 255;
  g /= 255;
  b /= 255;
  const max = Math.max(r, g, b);
  const min = Math.min(r, g, b);
  const delta = max - min;
  if (max === min) {
    return 0;
  }
  let hue = (max + min) / 2;
  switch (max) {
    case r:
      hue = (g - b) / delta + (g < b ? 6 : 0);
      break;
    case g:
      hue = (b - r) / delta + 2;
      break;
    case b:
      hue = (r - g) / delta + 4;
      break;
  }
  return Math.round(hue * 60);
}
/**
 * For a hex color, find the hue
 *
 * @param hex {string} - form of "#------"
 */
export function hexToHue(hex) {
  return rgbToHue(hexToRGB(hex));
}