+ * @cfg {Object} label
+ * Object with the following properties:
+ *
+ * - **display** : String
+ *
+ * Specifies the presence and position of labels for each pie slice. Either "rotate", "middle", "insideStart",
+ * "insideEnd", "outside", "over", "under", or "none" to prevent label rendering.
+ * Default value: 'none'.
+ *
+ * - **color** : String
+ *
+ * The color of the label text.
+ * Default value: '#000' (black).
+ *
+ * - **contrast** : Boolean
+ *
+ * True to render the label in contrasting color with the backround.
+ * Default value: false.
+ *
+ * - **field** : String
+ *
+ * The name of the field to be displayed in the label.
+ * Default value: 'name'.
+ *
+ * - **minMargin** : Number
+ *
+ * Specifies the minimum distance from a label to the origin of the visualization.
+ * This parameter is useful when using PieSeries width variable pie slice lengths.
+ * Default value: 50.
+ *
+ * - **font** : String
+ *
+ * The font used for the labels.
+ * Default value: "11px Helvetica, sans-serif".
+ *
+ * - **orientation** : String
+ *
+ * Either "horizontal" or "vertical".
+ * Dafault value: "horizontal".
+ *
+ * - **renderer** : Function
+ *
+ * Optional function for formatting the label into a displayable value.
+ * Default value: function(v) { return v; }