/**
 * The AreaSeries class renders quantitative data on a graph by creating a fill between 0
 * and the relevant data points.
 *
 * @module charts
 * @class AreaSeries
 * @extends CartesianSeries
 * @uses Fills
 * @constructor
 */
Y.AreaSeries = Y.Base.create("areaSeries", Y.CartesianSeries, [Y.Fills], {
    /**
     * @protected
     *
     * Renders the series. 
     *
     * @method drawSeries
     */
    drawSeries: function()
    {
        this.drawFill.apply(this, this._getClosingPoints());
    },
    
    /**
     * @protected
     *
     * Method used by `styles` setter. Overrides base implementation.
     *
     * @method _setStyles
     * @param {Object} newStyles Hash of properties to update.
     * @return Object
     */
    _setStyles: function(val)
    {
        if(!val.area)
        {
            val = {area:val};
        }
        return Y.AreaSeries.superclass._setStyles.apply(this, [val]);
    },

    /**
     * @protected
     *
     * Gets the default value for the `styles` attribute. Overrides
     * base implementation.
     *
     * @method _getDefaultStyles
     * @return Object
     */
    _getDefaultStyles: function()
    {
        var styles = this._mergeStyles({area:this._getAreaDefaults()}, Y.AreaSeries.superclass._getDefaultStyles());
        return styles;
    }
},
{
    ATTRS: {
        /**
         * Read-only attribute indicating the type of series.
         *
         * @attribute type
         * @type String
         * @default area
         */
        type: {
            value:"area"
        }
        
        /**
         * Style properties used for drawing area fills. This attribute is inherited from `Renderer`. Below are the default values:
         *
         *  <dl>
         *      <dt>color</dt><dd>The color of the fill. The default value is determined by the order of the series on the graph. The color will be 
         *      retrieved from the following array:
         *      `["#66007f", "#a86f41", "#295454", "#996ab2", "#e8cdb7", "#90bdbd","#000000","#c3b8ca", "#968373", "#678585"]`
         *      </dd>
         *      <dt>alpha</dt><dd>Number between 0 and 1 that indicates the opacity of the fill. The default value is 1</dd>
         *  </dl>
         *
         * @attribute styles
         * @type Object
         */
    }
});