en/builder/src/echarts3/model/mixin/colorPalette.js

import { set, get } from '../../util/clazz';
export default {
  clearColorPalette: function () {
    set(this, 'colorIdx', 0);
    set(this, 'colorNameMap', {});
  },
  getColorFromPalette: function (name, scope) {
    scope = scope || this;
    var colorIdx = get(scope, 'colorIdx') || 0;
    var colorNameMap = get(scope, 'colorNameMap') || set(scope, 'colorNameMap', {}); // Use `hasOwnProperty` to avoid conflict with Object.prototype.

    if (colorNameMap.hasOwnProperty(name)) {
      return colorNameMap[name];
    }

    var colorPalette = this.get('color', true) || [];

    if (!colorPalette.length) {
      return;
    }

    var color = colorPalette[colorIdx];

    if (name) {
      colorNameMap[name] = color;
    }

    set(scope, 'colorIdx', (colorIdx + 1) % colorPalette.length);
    return color;
  }
};