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+Sencha Documentation Project/**
+ * @class Ext.chart.Navigation
+ *
+ * Handles panning and zooming capabilities.
+ *
+ * @ignore
+ */
+Ext.define('Ext.chart.Navigation', {
+
+ constructor: function() {
+ this.originalStore = this.store;
+ },
+
+ //filters the store to the specified interval(s)
+ setZoom: function(zoomConfig) {
+ var me = this,
+ store = me.substore || me.store,
+ bbox = me.chartBBox,
+ len = store.getCount(),
+ from = (zoomConfig.x / bbox.width * len) >> 0,
+ to = Math.ceil(((zoomConfig.x + zoomConfig.width) / bbox.width * len)),
+ recFieldsLen, recFields = [], curField, json = [], obj;
+
+ store.each(function(rec, i) {
+ if (i < from || i > to) {
+ return;
+ }
+ obj = {};
+ //get all record field names in a simple array
+ if (!recFields.length) {
+ rec.fields.each(function(f) {
+ recFields.push(f.name);
+ });
+ recFieldsLen = recFields.length;
+ }
+ //append record values to an aggregation record
+ for (i = 0; i < recFieldsLen; i++) {
+ curField = recFields[i];
+ obj[curField] = rec.get(curField);
+ }
+ json.push(obj);
+ });
+ me.store = me.substore = Ext.create('Ext.data.JsonStore', {
+ fields: recFields,
+ data: json
+ });
+ me.redraw(true);
+ },
+
+ restoreZoom: function() {
+ this.store = this.substore = this.originalStore;
+ this.redraw(true);
+ }
+
+});
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