docs/source/Navigation.html

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  18   <pre class="prettyprint lang-js"><span id='Ext-chart-Navigation'>/**
  19 </span> * @class Ext.chart.Navigation
  20  *
  21  * Handles panning and zooming capabilities.
  22  *
  23  * @ignore
  24  */
  25 Ext.define('Ext.chart.Navigation', {
  26
  27     constructor: function() {
  28         this.originalStore = this.store;
  29     },
  30
  31     //filters the store to the specified interval(s)
  32     setZoom: function(zoomConfig) {
  33         var me = this,
  34             store = me.substore || me.store,
  35             bbox = me.chartBBox,
  36             len = store.getCount(),
  37             from = (zoomConfig.x / bbox.width * len) &gt;&gt; 0,
  38             to = Math.ceil(((zoomConfig.x + zoomConfig.width) / bbox.width * len)),
  39             recFieldsLen, recFields = [], curField, json = [], obj;
  40
  41         store.each(function(rec, i) {
  42             if (i &lt; from || i &gt; to) {
  43                 return;
  44             }
  45             obj = {};
  46             //get all record field names in a simple array
  47             if (!recFields.length) {
  48                 rec.fields.each(function(f) {
  49                     recFields.push(f.name);
  50                 });
  51                 recFieldsLen = recFields.length;
  52             }
  53             //append record values to an aggregation record
  54             for (i = 0; i &lt; recFieldsLen; i++) {
  55                 curField = recFields[i];
  56                 obj[curField] = rec.get(curField);
  57             }
  58             json.push(obj);
  59         });
  60         me.store = me.substore = Ext.create('Ext.data.JsonStore', {
  61             fields: recFields,
  62             data: json
  63         });
  64         me.redraw(true);
  65     },
  66
  67     restoreZoom: function() {
  68         this.store = this.substore = this.originalStore;
  69         this.redraw(true);
  70     }
  71
  72 });</pre>
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