code: function() {
      var width = (this.graph_width / this.data_size) - this.bar_padding;
  
      if (this.grouped) {
        //width = width / this.group_size - (this.bar_padding * this.group_size);
      }
  
      if (this.options.max_bar_size && width > this.options.max_bar_size) {
        width = this.options.max_bar_size;
        this.bar_padding = this.graph_width / this.data_size;
      }
  
      return width;
    }
docs: Calculates the width of each bar.
  
  @returns {Integer} The bar width