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annotate geotemco/lib/simile/timeplot/scripts/processor.js @ 0:b12c99b7c3f0

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author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Mon, 19 Jan 2015 17:13:49 +0100
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1 /**
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2 * Processing Data Source
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3 *
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4 * @fileOverview Processing Data Source and Operators
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5 * @name Processor
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6 */
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7
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8 /* -----------------------------------------------------------------------------
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9 * Operators
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10 *
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11 * These are functions that can be used directly as Timeplot.Processor operators
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12 * ----------------------------------------------------------------------------- */
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13
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14 Timeplot.Operator = {
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16 /**
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17 * This is the operator used when you want to draw the cumulative sum
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18 * of a time series and not, for example, their daily values.
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19 */
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20 sum: function(data, params) {
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21 return Timeplot.Math.integral(data.values);
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22 },
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23
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24 /**
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25 * This is the operator that is used to 'smooth' a given time series
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26 * by taking the average value of a moving window centered around
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27 * each value. The size of the moving window is influenced by the 'size'
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28 * parameters in the params map.
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29 */
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30 average: function(data, params) {
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31 var size = ("size" in params) ? params.size : 30;
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32 var result = Timeplot.Math.movingAverage(data.values, size);
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33 return result;
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34 }
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35 }
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36
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37 /*==================================================
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38 * Processing Data Source
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39 *==================================================*/
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40
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41 /**
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42 * A Processor is a special DataSource that can apply an Operator
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43 * to the DataSource values and thus return a different one.
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44 *
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45 * @constructor
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46 */
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47 Timeplot.Processor = function(dataSource, operator, params) {
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48 this._dataSource = dataSource;
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49 this._operator = operator;
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50 this._params = params;
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51
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52 this._data = {
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53 times: new Array(),
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54 values: new Array()
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55 };
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56
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57 this._range = {
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58 earliestDate: null,
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59 latestDate: null,
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60 min: 0,
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61 max: 0
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62 };
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63
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64 var processor = this;
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65 this._processingListener = {
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66 onAddMany: function() { processor._process(); },
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67 onClear: function() { processor._clear(); }
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68 }
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69 this.addListener(this._processingListener);
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70 };
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71
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72 Timeplot.Processor.prototype = {
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73
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74 _clear: function() {
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75 this.removeListener(this._processingListener);
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76 this._dataSource._clear();
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77 },
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78
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79 _process: function() {
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80 // this method requires the dataSource._process() method to be
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81 // called first as to setup the data and range used below
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82 // this should be guaranteed by the order of the listener registration
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83
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84 var data = this._dataSource.getData();
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85 var range = this._dataSource.getRange();
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86
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87 var newValues = this._operator(data, this._params);
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88 var newValueRange = Timeplot.Math.range(newValues);
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89
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90 this._data = {
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91 times: data.times,
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92 values: newValues
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93 };
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94
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95 this._range = {
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96 earliestDate: range.earliestDate,
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97 latestDate: range.latestDate,
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98 min: newValueRange.min,
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99 max: newValueRange.max
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100 };
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101 },
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102
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103 getRange: function() {
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104 return this._range;
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105 },
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106
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107 getData: function() {
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108 return this._data;
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109 },
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110
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111 getValue: Timeplot.DataSource.prototype.getValue,
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112
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113 getClosestValidTime: Timeplot.DataSource.prototype.getClosestValidTime,
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114
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115 addListener: function(listener) {
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116 this._dataSource.addListener(listener);
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117 },
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118
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119 removeListener: function(listener) {
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120 this._dataSource.removeListener(listener);
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121 }
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122 }