| 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() { |
| 13 | |
| 14 | /*global Dygraph:false */ |
| 15 | "use strict"; |
| 16 | |
| 17 | Dygraph.DataHandlers.DefaultFractionHandler = Dygraph.DataHandler(); |
| 18 | var DefaultFractionHandler = Dygraph.DataHandlers.DefaultFractionHandler; |
| 19 | DefaultFractionHandler.prototype = new Dygraph.DataHandlers.DefaultHandler(); |
| 20 | |
| 21 | DefaultFractionHandler.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; |
| 35 | } |
| 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 ] ]); |
| 46 | } else { |
| 47 | series.push([ x, num, [ num, den ] ]); |
| 48 | } |
| 49 | } else { |
| 50 | series.push([ x, null, [ null, null ] ]); |
| 51 | } |
| 52 | } |
| 53 | return series; |
| 54 | }; |
| 55 | |
| 56 | DefaultFractionHandler.prototype.rollingAverage = function(originalData, rollPeriod, |
| 57 | options) { |
| 58 | rollPeriod = Math.min(rollPeriod, originalData.length); |
| 59 | var rollingData = []; |
| 60 | |
| 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]; |
| 71 | } |
| 72 | |
| 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 | |
| 81 | })(); |