src/charts/barchart.js

import Chart from './base/Chart';
import * as defaultProperties from '../utils/defaults/linechart';

/**
 * Barchart implementation. This charts belongs to 'Basic' family.
 * It is inherited on 'Basic'.
 */
export default class Barchart extends Chart {

  /**
   * Barchart constructor. It needs (at least) one argument to start: data.
   * Optionally, you can indicate a second argument that includes all the chart options. If you 
   * do not specify this, '_default' object is used by default.
   */
  constructor(data, config) {
    super(data, config);
    let keys = Object.keys(defaultProperties.defaults);
    this._initializeAPI(keys);
  }

  /**
   * Renders a data object on the chart.
   * @param  {Object} data - This object contains the data that will be rendered on chart. If you do not
   * specify this param, this.data will be used instead.
   */
  draw(data = this.data) {
    super.draw(data);
  }

  fire(event, data) {//TODO: improve this section
    if (event === 'transition') {
      if (data === 'grouped') {
        this._svg.strategy.transition2Grouped();
      }
      else if (data === 'stacked') {
        this._svg.strategy.transition2Stacked();
      }

      this._svg.strategy.draw();
    }
  }

  /**
   * Add new data to the current graph. If it is empty, this creates a new one.
   * @param  {Object} datum - data to be rendered
   */
  keepDrawing(datum) {
    super.keepDrawing(datum, 'replace');
  }
  
  _keepDrawingByReplacing(datum) {
    let datumType = datum.constructor;
    if (datumType === Array) {
      this.data = datum;
    }
    else {
      for (let i = 0; i < this.data.length; i++) {
        var d = this.data[i];
        if (d.x === datum.x) {
          this.data[i] = datum;
          break;
        }
      }
    }

    this.draw(JSON.parse(JSON.stringify(this.data)));
  }


}