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a49c164a DE |
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 custom bars option. | |
9 | * @author David Eberlein (david.eberlein@ch.sauter-bc.com) | |
10 | */ | |
11 | ||
3ea41d86 DV |
12 | /*global Dygraph:false */ |
13 | "use strict"; | |
14 | ||
e8c70e4e DV |
15 | import BarsHandler from './bars'; |
16 | ||
749281f8 DV |
17 | /** |
18 | * @constructor | |
19 | * @extends Dygraph.DataHandlers.BarsHandler | |
20 | */ | |
e8c70e4e | 21 | var CustomBarsHandler = function() { |
749281f8 DV |
22 | }; |
23 | ||
e8c70e4e | 24 | CustomBarsHandler.prototype = new BarsHandler(); |
3ea41d86 | 25 | |
749281f8 | 26 | /** @inheritDoc */ |
3ea41d86 DV |
27 | CustomBarsHandler.prototype.extractSeries = function(rawData, i, options) { |
28 | // TODO(danvk): pre-allocate series here. | |
29 | var series = []; | |
30 | var x, y, point; | |
31 | var logScale = options.get('logscale'); | |
32 | for ( var j = 0; j < rawData.length; j++) { | |
33 | x = rawData[j][0]; | |
34 | point = rawData[j][i]; | |
35 | if (logScale && point !== null) { | |
36 | // On the log scale, points less than zero do not exist. | |
37 | // This will create a gap in the chart. | |
38 | if (point[0] <= 0 || point[1] <= 0 || point[2] <= 0) { | |
39 | point = null; | |
a49c164a | 40 | } |
3ea41d86 DV |
41 | } |
42 | // Extract to the unified data format. | |
43 | if (point !== null) { | |
44 | y = point[1]; | |
45 | if (y !== null && !isNaN(y)) { | |
46 | series.push([ x, y, [ point[0], point[2] ] ]); | |
a49c164a | 47 | } else { |
3ea41d86 | 48 | series.push([ x, y, [ y, y ] ]); |
a49c164a | 49 | } |
3ea41d86 DV |
50 | } else { |
51 | series.push([ x, null, [ null, null ] ]); | |
a49c164a | 52 | } |
3ea41d86 DV |
53 | } |
54 | return series; | |
55 | }; | |
a49c164a | 56 | |
749281f8 DV |
57 | /** @inheritDoc */ |
58 | CustomBarsHandler.prototype.rollingAverage = | |
59 | function(originalData, rollPeriod, options) { | |
3ea41d86 DV |
60 | rollPeriod = Math.min(rollPeriod, originalData.length); |
61 | var rollingData = []; | |
62 | var y, low, high, mid,count, i, extremes; | |
a49c164a | 63 | |
3ea41d86 DV |
64 | low = 0; |
65 | mid = 0; | |
66 | high = 0; | |
67 | count = 0; | |
68 | for (i = 0; i < originalData.length; i++) { | |
69 | y = originalData[i][1]; | |
70 | extremes = originalData[i][2]; | |
71 | rollingData[i] = originalData[i]; | |
a49c164a | 72 | |
3ea41d86 DV |
73 | if (y !== null && !isNaN(y)) { |
74 | low += extremes[0]; | |
75 | mid += y; | |
76 | high += extremes[1]; | |
77 | count += 1; | |
78 | } | |
79 | if (i - rollPeriod >= 0) { | |
80 | var prev = originalData[i - rollPeriod]; | |
81 | if (prev[1] !== null && !isNaN(prev[1])) { | |
82 | low -= prev[2][0]; | |
83 | mid -= prev[1]; | |
84 | high -= prev[2][1]; | |
85 | count -= 1; | |
a49c164a DE |
86 | } |
87 | } | |
3ea41d86 DV |
88 | if (count) { |
89 | rollingData[i] = [ | |
90 | originalData[i][0], | |
91 | 1.0 * mid / count, | |
92 | [ 1.0 * low / count, | |
93 | 1.0 * high / count ] ]; | |
94 | } else { | |
95 | rollingData[i] = [ originalData[i][0], null, [ null, null ] ]; | |
96 | } | |
97 | } | |
98 | ||
99 | return rollingData; | |
100 | }; | |
a49c164a | 101 | |
e8c70e4e | 102 | export default CustomBarsHandler; |