src/examples/stockapp/app/store/MovingAverage.js

   1 Ext.define("StockApp.store.MovingAverage", {
   2     alias: 'store.Apple',
   3     requires: ['StockApp.model.Stock', 'Ext.data.reader.Array'],
   4     extend: "Ext.data.ArrayStore",
   5     config: {
   6         model: "StockApp.model.Stock",
   7         source: null,
   8         window: 50
   9     },
  10
  11     applySource: function (source) {
  12         return Ext.StoreManager.lookup(source);
  13     },
  14
  15     updateSource: function (source, oldSource) {
  16         if (source) {
  17             source.on('refresh', 'onRefreshSource', this);
  18             this.setOriginalData(source.getData());
  19         }
  20         if (oldSource) {
  21             oldSource.on('refresh', 'onRefreshSource', this);
  22         }
  23     },
  24
  25     onRefreshSource: function () {
  26         if (this.getSource()) {
  27             this.setOriginalData(this.getSource().getData());
  28         }
  29     },
  30
  31     setOriginalData: function (data) {
  32         var length = data.length,
  33             items = data.items,
  34             ma = [],
  35             window = this.getWindow(),
  36             item, item2,
  37             cntDate = 0,
  38             cntOpen = 0,
  39             cntHigh = 0,
  40             cntLow = 0,
  41             cntClose = 0,
  42             cntVolume = 0,
  43             cntAdjClose = 0,
  44             i, j;
  45         for (i = 0; i < window; i++) {
  46             item = items[i].data;
  47             cntDate += item.date;
  48             cntOpen += item.open;
  49             cntHigh += item.high;
  50             cntLow += item.low;
  51             cntClose += item.close;
  52             cntVolume += item.volume;
  53             cntAdjClose += item.adjClose;
  54             ma.push([
  55                 cntDate / (i + 1),
  56                 cntOpen / (i + 1),
  57                 cntHigh / (i + 1),
  58                 cntLow / (i + 1),
  59                 cntClose / (i + 1),
  60                 cntVolume / (i + 1),
  61                 cntAdjClose / (i + 1)
  62             ]);
  63         }
  64         for (i = 0, j = window; j < length; i++, j++) {
  65             item = items[i].data;
  66             item2 = items[j].data;
  67             cntDate += item2.date - item.date;
  68             cntOpen += item2.open - item.open;
  69             cntHigh += item2.high - item.high;
  70             cntLow += item2.low - item.low;
  71             cntClose += item2.close - item.close;
  72             cntVolume += item2.volume - item.volume;
  73             cntAdjClose += item2.adjClose - item.adjClose;
  74             ma.push([
  75                 cntDate / window,
  76                 cntOpen / window,
  77                 cntHigh / window,
  78                 cntLow / window,
  79                 cntClose / window,
  80                 cntVolume / window,
  81                 cntAdjClose / window
  82             ]);
  83         }
  84         for (; i < length - 1; i++) {
  85             item = items[i].data;
  86             cntDate -= item.date;
  87             cntOpen -= item.open;
  88             cntHigh -= item.high;
  89             cntLow -= item.low;
  90             cntClose -= item.close;
  91             cntVolume -= item.volume;
  92             cntAdjClose -= item.adjClose;
  93             ma.push([
  94                 cntDate / (length - i - 1),
  95                 cntOpen / (length - i - 1),
  96                 cntHigh / (length - i - 1),
  97                 cntLow / (length - i - 1),
  98                 cntClose / (length - i - 1),
  99                 cntVolume / (length - i - 1),
 100                 cntAdjClose / (length - i - 1)
 101             ]);
 102         }
 103         item = items[i].data;
 104         ma.push([
 105             item.date,
 106             item.open,
 107             item.high,
 108             item.low,
 109             item.close,
 110             item.volume,
 111             item.adjClose
 112         ]);
 113         this.setData(ma);
 114     }
 115 });