kibana-riya/src/core_plugins/timelion/server/series_functions/range.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

'use strict';

var alter = require('../lib/alter.js');
var _ = require('lodash');
var Chainable = require('../lib/classes/chainable');
module.exports = new Chainable('range', {
  args: [{
    name: 'inputSeries',
    types: ['seriesList']
  }, {
    name: 'min',
    types: ['number'],
    help: 'New minimum value'
  }, {
    name: 'max',
    types: ['number'],
    help: 'New maximum value'
  }],
  help: 'Changes the max and min of a series while keeping the same shape',
  fn: function range(args) {
    return alter(args, function (eachSeries) {
      var values = _.map(eachSeries.data, 1);
      var min = _.min(values);
      var max = _.max(values);

      // newvalue= (max'-min')/(max-min)*(value-min)+min'.
      var data = _.map(eachSeries.data, function (point) {
        var val = (args.byName.max - args.byName.min) / (max - min) * (point[1] - min) + args.byName.min;
        return [point[0], val];
      });
      eachSeries.data = data;
      return eachSeries;
    });
  }
});