superset-frontend/src/utils/colorUtils.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
export function hexToRgb(h: string) {
  let r = '0';
  let g = '0';
  let b = '0';

  // 3 digits
  if (h.length === 4) {
    r = `0x${h[1]}${h[1]}`;
    g = `0x${h[2]}${h[2]}`;
    b = `0x${h[3]}${h[3]}`;

    // 6 digits
  } else if (h.length === 7) {
    r = `0x${h[1]}${h[2]}`;
    g = `0x${h[3]}${h[4]}`;
    b = `0x${h[5]}${h[6]}`;
  }

  return `rgb(${+r}, ${+g}, ${+b})`;
}

export function rgbToHex(red: number, green: number, blue: number) {
  let r = red.toString(16);
  let g = green.toString(16);
  let b = blue.toString(16);

  if (r.length === 1) r = `0${r}`;
  if (g.length === 1) g = `0${g}`;
  if (b.length === 1) b = `0${b}`;

  return `#${r}${g}${b}`;
}