@qogni/dygraphs/src-es5/datahandler/default-fractions.js

dygraphs is a fast, flexible open source JavaScript charting library.

/**
 * @license
 * Copyright 2013 David Eberlein (david.eberlein@ch.sauter-bc.com)
 * MIT-licensed (http://opensource.org/licenses/MIT)
 */

/**
 * @fileoverview DataHandler implementation for the fractions option.
 * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
 */

/*global Dygraph:false */
"use strict";

Object.defineProperty(exports, '__esModule', {
  value: true
});

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _datahandler = require('./datahandler');

var _datahandler2 = _interopRequireDefault(_datahandler);

var _default = require('./default');

var _default2 = _interopRequireDefault(_default);

/**
 * @extends DefaultHandler
 * @constructor
 */
var DefaultFractionHandler = function DefaultFractionHandler() {};

DefaultFractionHandler.prototype = new _default2['default']();

DefaultFractionHandler.prototype.extractSeries = function (rawData, i, options) {
  // TODO(danvk): pre-allocate series here.
  var series = [];
  var x, y, point, num, den, value;
  var mult = 100.0;
  var logScale = options.get('logscale');
  for (var j = 0; j < rawData.length; j++) {
    x = rawData[j][0];
    point = rawData[j][i];
    if (logScale && point !== null) {
      // On the log scale, points less than zero do not exist.
      // This will create a gap in the chart.
      if (point[0] <= 0 || point[1] <= 0) {
        point = null;
      }
    }
    // Extract to the unified data format.
    if (point !== null) {
      num = point[0];
      den = point[1];
      if (num !== null && !isNaN(num)) {
        value = den ? num / den : 0.0;
        y = mult * value;
        // preserve original values in extras for further filtering
        series.push([x, y, [num, den]]);
      } else {
        series.push([x, num, [num, den]]);
      }
    } else {
      series.push([x, null, [null, null]]);
    }
  }
  return series;
};

DefaultFractionHandler.prototype.rollingAverage = function (originalData, rollPeriod, options) {
  rollPeriod = Math.min(rollPeriod, originalData.length);
  var rollingData = [];

  var i;
  var num = 0;
  var den = 0; // numerator/denominator
  var mult = 100.0;
  for (i = 0; i < originalData.length; i++) {
    num += originalData[i][2][0];
    den += originalData[i][2][1];
    if (i - rollPeriod >= 0) {
      num -= originalData[i - rollPeriod][2][0];
      den -= originalData[i - rollPeriod][2][1];
    }

    var date = originalData[i][0];
    var value = den ? num / den : 0.0;
    rollingData[i] = [date, mult * value];
  }

  return rollingData;
};

exports['default'] = DefaultFractionHandler;
module.exports = exports['default'];