    /**
     * @class Ext.chart.axis.Abstract
     * Base class for all axis classes.
     * @private
     */
    Ext.define('Ext.chart.axis.Abstract', {

        /* Begin Definitions */

        requires: ['Ext.chart.Chart'],

        /* End Definitions */

        /**
         * @cfg {Ext.chart.Label} label
         * The config for chart label.
         */

        /**
         * @cfg {String[]} fields
         * The fields of model to bind to this axis.
         *
         * For example if you have a data set of lap times per car, each having the fields:
         * 'carName', 'agvSpeed', 'maxSpeed'. Then you might want to show the data on chart
         * with `['carName']` on Name axis and `['avgSpeed', 'maxSpeed']` on Speed axis.
         */

        /**
         * Creates new Axis.
         * @param {Object} config (optional) Config options.
         */
        constructor: function(config) {
            config = config || {};

            var me = this,
                pos = config.position || 'left';

            pos = pos.charAt(0).toUpperCase() + pos.substring(1);
            //axisLabel(Top|Bottom|Right|Left)Style
            config.label = Ext.apply(config['axisLabel' + pos + 'Style'] || {}, config.label || {});
            config.axisTitleStyle = Ext.apply(config['axisTitle' + pos + 'Style'] || {}, config.labelTitle || {});
            Ext.apply(me, config);
            me.fields = Ext.Array.from(me.fields);
            this.callParent();
            me.labels = [];
            me.getId();
            me.labelGroup = me.chart.surface.getGroup(me.axisId + "-labels");
        },

        alignment: null,
        grid: false,
        steps: 10,
        x: 0,
        y: 0,
        minValue: 0,
        maxValue: 0,

        getId: function() {
            return this.axisId || (this.axisId = Ext.id(null, 'ext-axis-'));
        },

        /*
          Called to process a view i.e to make aggregation and filtering over
          a store creating a substore to be used to render the axis. Since many axes
          may do different things on the data and we want the final result of all these
          operations to be rendered we need to call processView on all axes before drawing
          them.
        */
        processView: Ext.emptyFn,

        drawAxis: Ext.emptyFn,
        addDisplayAndLabels: Ext.emptyFn
    });