datahandler/bars.js

   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 base implementation for the "bar"
   9  * data formats. This implementation must be extended and the
  10  * extractSeries and rollingAverage must be implemented.
  11  * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
  12  */
  13
  14 (function() {
  15
  16 /*global Dygraph:false */
  17 /*global DygraphLayout:false */
  18 "use strict";
  19
  20 Dygraph.DataHandlers.BarsHandler = Dygraph.DataHandler();
  21 var BarsHandler = Dygraph.DataHandlers.BarsHandler;
  22
  23 // errorBars
  24 BarsHandler.prototype.extractSeries = function(rawData, i, options) {
  25   // Not implemented here must be extended
  26 };
  27
  28 BarsHandler.prototype.rollingAverage =
  29     function(originalData, rollPeriod, options) {
  30   // Not implemented here, must be extended.
  31 };
  32
  33 BarsHandler.prototype.onPointsCreated_ = function(series, points) {
  34   for (var i = 0; i < series.length; ++i) {
  35     var item = series[i];
  36     var point = points[i];
  37     point.y_top = NaN;
  38     point.y_bottom = NaN;
  39     point.yval_minus = DygraphLayout.parseFloat_(item[2][0]);
  40     point.yval_plus = DygraphLayout.parseFloat_(item[2][1]);
  41   }
  42 };
  43
  44 BarsHandler.prototype.getExtremeYValues = function(series, dateWindow, options) {
  45   var minY = null, maxY = null, y;
  46
  47   var firstIdx = 0;
  48   var lastIdx = series.length - 1;
  49
  50   for ( var j = firstIdx; j <= lastIdx; j++) {
  51     y = series[j][1];
  52     if (y === null || isNaN(y)) continue;
  53
  54     var low = series[j][2][0];
  55     var high = series[j][2][1];
  56
  57     if (low > y) low = y; // this can happen with custom bars,
  58     if (high < y) high = y; // e.g. in tests/custom-bars.html
  59
  60     if (maxY === null || high > maxY) maxY = high;
  61     if (minY === null || low < minY) minY = low;
  62   }
  63
  64   return [ minY, maxY ];
  65 };
  66
  67 BarsHandler.prototype.onLineEvaluated = function(points, axis, logscale) {
  68   var point;
  69   for (var j = 0; j < points.length; j++) {
  70     // Copy over the error terms
  71     point = points[j];
  72     point.y_top = DygraphLayout._calcYNormal(axis, point.yval_minus, logscale);
  73     point.y_bottom = DygraphLayout._calcYNormal(axis, point.yval_plus, logscale);
  74   }
  75 };
  76
  77 })();