3 * Copyright 2013 David Eberlein (david.eberlein@ch.sauter-bc.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview DataHandler implementation for the fractions option.
9 * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
14 /*global Dygraph:false */
18 * @extends Dygraph.DataHandlers.DefaultHandler
21 Dygraph
.DataHandlers
.DefaultFractionHandler
= function() {
24 var DefaultFractionHandler
= Dygraph
.DataHandlers
.DefaultFractionHandler
;
25 DefaultFractionHandler
.prototype = new Dygraph
.DataHandlers
.DefaultHandler();
27 DefaultFractionHandler
.prototype.extractSeries
= function(rawData
, i
, options
) {
28 // TODO(danvk): pre-allocate series here.
30 var x
, y
, point
, num
, den
, value
;
32 var logScale
= options
.get('logscale');
33 for ( var j
= 0; j
< rawData
.length
; j
++) {
35 point
= rawData
[j
][i
];
36 if (logScale
&& point
!== null) {
37 // On the log scale, points less than zero do not exist.
38 // This will create a gap in the chart.
39 if (point
[0] <= 0 || point
[1] <= 0) {
43 // Extract to the unified data format.
47 if (num
!== null && !isNaN(num
)) {
48 value
= den
? num
/ den
: 0.0;
50 // preserve original values in extras for further filtering
51 series
.push([ x
, y
, [ num
, den
] ]);
53 series
.push([ x
, num
, [ num
, den
] ]);
56 series
.push([ x
, null, [ null, null ] ]);
62 DefaultFractionHandler
.prototype.rollingAverage
= function(originalData
, rollPeriod
,
64 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
69 var den
= 0; // numerator/denominator
71 for (i
= 0; i
< originalData
.length
; i
++) {
72 num
+= originalData
[i
][2][0];
73 den
+= originalData
[i
][2][1];
74 if (i
- rollPeriod
>= 0) {
75 num
-= originalData
[i
- rollPeriod
][2][0];
76 den
-= originalData
[i
- rollPeriod
][2][1];
79 var date
= originalData
[i
][0];
80 var value
= den
? num
/ den
: 0.0;
81 rollingData
[i
] = [ date
, mult
* value
];