Defines a mask for a chart's series. +The 'chart' member must be set prior to rendering.
+ +A Mask can be used to select a certain region in a chart.
+When enabled, the select event will be triggered when a
+region is selected by the mask, allowing the user to perform
+other tasks like zooming on that region, etc.
In order to use the mask one has to set the Chart mask option to
+true, vertical or horizontal. Then a possible configuration for the
+listener could be:
items: {
+ xtype: 'chart',
+ animate: true,
+ store: store1,
+ mask: 'horizontal',
+ listeners: {
+ select: {
+ fn: function(me, selection) {
+ me.setZoom(selection);
+ me.mask.hide();
+ }
+ }
+ },
+In this example we zoom the chart to that particular region. You can also get
+a handle to a mask instance from the chart object. The chart.mask element is a
+Ext.Panel.