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