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[dygraphs.git] / datahandler / default-fractions.js
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1/**
2 * @license
3 * Copyright 2013 David Eberlein (david.eberlein@ch.sauter-bc.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
5 */
6
7/**
8 * @fileoverview DataHandler implementation for the fractions option.
9 * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
10 */
11
12(function() {
a49c164a 13
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14/*global Dygraph:false */
15"use strict";
a49c164a 16
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17Dygraph.DataHandlers.DefaultFractionHandler = Dygraph.DataHandler();
18var DefaultFractionHandler = Dygraph.DataHandlers.DefaultFractionHandler;
19DefaultFractionHandler.prototype = new Dygraph.DataHandlers.DefaultHandler();
20
21DefaultFractionHandler.prototype.extractSeries = function(rawData, i, options) {
22 // TODO(danvk): pre-allocate series here.
23 var series = [];
24 var x, y, point, num, den, value;
25 var mult = 100.0;
26 var logScale = options.get('logscale');
27 for ( var j = 0; j < rawData.length; j++) {
28 x = rawData[j][0];
29 point = rawData[j][i];
30 if (logScale && point !== null) {
31 // On the log scale, points less than zero do not exist.
32 // This will create a gap in the chart.
33 if (point[0] <= 0 || point[1] <= 0) {
34 point = null;
a49c164a 35 }
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36 }
37 // Extract to the unified data format.
38 if (point !== null) {
39 num = point[0];
40 den = point[1];
41 if (num !== null && !isNaN(num)) {
42 value = den ? num / den : 0.0;
43 y = mult * value;
44 // preserve original values in extras for further filtering
45 series.push([ x, y, [ num, den ] ]);
a49c164a 46 } else {
3ea41d86 47 series.push([ x, num, [ num, den ] ]);
a49c164a 48 }
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49 } else {
50 series.push([ x, null, [ null, null ] ]);
a49c164a 51 }
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52 }
53 return series;
54};
a49c164a 55
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56DefaultFractionHandler.prototype.rollingAverage = function(originalData, rollPeriod,
57 options) {
58 rollPeriod = Math.min(rollPeriod, originalData.length);
59 var rollingData = [];
a49c164a 60
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61 var i;
62 var num = 0;
63 var den = 0; // numerator/denominator
64 var mult = 100.0;
65 for (i = 0; i < originalData.length; i++) {
66 num += originalData[i][2][0];
67 den += originalData[i][2][1];
68 if (i - rollPeriod >= 0) {
69 num -= originalData[i - rollPeriod][2][0];
70 den -= originalData[i - rollPeriod][2][1];
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71 }
72
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73 var date = originalData[i][0];
74 var value = den ? num / den : 0.0;
75 rollingData[i] = [ date, mult * value ];
76 }
77
78 return rollingData;
79};
80
a49c164a 81})();