@wordpress/components/build/duotone-picker/utils.js

UI components for WordPress.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getColorStopsFromColors = getColorStopsFromColors;
exports.getColorsFromColorStops = getColorsFromColorStops;
exports.getDefaultColors = getDefaultColors;
exports.getGradientFromCSSColors = getGradientFromCSSColors;
var _colord = require("colord");
var _names = _interopRequireDefault(require("colord/plugins/names"));
/**
 * External dependencies
 */

/**
 * Internal dependencies
 */

(0, _colord.extend)([_names.default]);

/**
 * Object representation for a color.
 *
 * @typedef {Object} RGBColor
 * @property {number} r Red component of the color in the range [0,1].
 * @property {number} g Green component of the color in the range [0,1].
 * @property {number} b Blue component of the color in the range [0,1].
 */

/**
 * Calculate the brightest and darkest values from a color palette.
 *
 * @param palette Color palette for the theme.
 *
 * @return Tuple of the darkest color and brightest color.
 */
function getDefaultColors(palette) {
  // A default dark and light color are required.
  if (!palette || palette.length < 2) {
    return ['#000', '#fff'];
  }
  return palette.map(({
    color
  }) => ({
    color,
    brightness: (0, _colord.colord)(color).brightness()
  })).reduce(([min, max], current) => {
    return [current.brightness <= min.brightness ? current : min, current.brightness >= max.brightness ? current : max];
  }, [{
    brightness: 1,
    color: ''
  }, {
    brightness: 0,
    color: ''
  }]).map(({
    color
  }) => color);
}

/**
 * Generate a duotone gradient from a list of colors.
 *
 * @param colors CSS color strings.
 * @param angle  CSS gradient angle.
 *
 * @return  CSS gradient string for the duotone swatch.
 */
function getGradientFromCSSColors(colors = [], angle = '90deg') {
  const l = 100 / colors.length;
  const stops = colors.map((c, i) => `${c} ${i * l}%, ${c} ${(i + 1) * l}%`).join(', ');
  return `linear-gradient( ${angle}, ${stops} )`;
}

/**
 * Convert a color array to an array of color stops.
 *
 * @param colors CSS colors array
 *
 * @return Color stop information.
 */
function getColorStopsFromColors(colors) {
  return colors.map((color, i) => ({
    position: i * 100 / (colors.length - 1),
    color
  }));
}

/**
 * Convert a color stop array to an array colors.
 *
 * @param colorStops Color stop information.
 *
 * @return CSS colors array.
 */
function getColorsFromColorStops(colorStops = []) {
  return colorStops.map(({
    color
  }) => color);
}
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