avocado-old/packages/graphics/color.js

import {compose, Property} from '@avocado/core';

const decorate = compose(
  Property('red'),
  Property('green'),
  Property('blue'),
  Property('alpha'),
)

export class Color {

  static fromCss(css) {
    if ('#'.charCodeAt(0) === css.charCodeAt(0)) {
      let hex = css.substr(1);
      if (3 === hex.length) {
        hex = hex.split('').map((c) => c + c).join('');
      }
      const red = parseInt(hex.substr(0, 2), 16);
      const green = parseInt(hex.substr(2, 2), 16);
      const blue = parseInt(hex.substr(4, 2), 16);
      return new Color(red, green, blue);
    }
    else {
      const colors = css.replace(
        /\s/g, ''
      ).match(
        /rgba?\((.*)\)/
      )[1].split(',');
      return new Color(colors[0], colors[1], colors[2], colors[3] || 1);
    }
  }

  constructor(red = 255, green = 0, blue = 255, alpha = 1) {
    this.red = red;
    this.green = green;
    this.blue = blue;
    this.alpha = alpha;
  }

  toCss() {
    return `rgba(${this.red}, ${this.green}, ${this.blue}, ${this.alpha})`;
  }

  toInteger() {
    return (this.red << 16) | (this.green << 8) | this.blue;
  }

}