Auto Calculation of Mean

by jlbriggs

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/highcharts-more.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="width:500px;height:400px;margin:1.5em 1em;"></div>

<script>
var d          = new Date();
var pointStart = d.getTime();
Highcharts.setOptions({
    global: {
        useUTC:false
    },
    colors: [
        'rgba( 0,   154, 253, 0.9 )', //bright blue
        'rgba( 253, 99,  0,   0.9 )', //bright orange
        'rgba( 40,  40,  56,  0.9 )', //dark
        'rgba( 253, 0,   154, 0.9 )', //bright pink
        'rgba( 154, 253, 0,   0.9 )', //bright green
        'rgba( 145, 44,  138, 0.9 )', //mid purple
        'rgba( 45,  47,  238, 0.9 )', //mid blue
        'rgba( 177, 69,  0,   0.9 )', //dark orange
        'rgba( 140, 140, 156, 0.9 )', //mid
        'rgba( 238, 46,  47,  0.9 )', //mid red
        'rgba( 44,  145, 51,  0.9 )', //mid green
        'rgba( 103, 16,  192, 0.9 )'  //dark purple
    ],
    chart: {
        alignTicks:false,
        type:'',
        margin:[60,25,100,90],
        //borderRadius:10,
        //borderWidth:1,
        //borderColor:'rgba(156,156,156,.25)',
        //backgroundColor:'rgba(204,204,204,.25)',
        //plotBackgroundColor:'rgba(255,255,255,1)',
        style: {
            fontFamily: 'Abel,serif'
        },
        events:{
            load: function() {
                this.credits.element.onclick = function() {
                    window.open(
                      'http://stackoverflow.com/users/1011544/jlbriggs?tab=profile'
                    );
                 }
            }
        }           
    },
    credits: {
        text : 'http://stackoverflow.com/users/1011544/jlbriggs',
        href : 'http://stackoverflow.com/users/1011544/jlbriggs?tab=profile'
    },
    title: {
        text:'Test Chart Title',
        align:'left',
        margin:10,
        x: 50,
        style: {
  ...

CSS

@import url(https://fonts.googleapis.com/css?family=Changa+One|Loved+by+the+King|Fredericka+the+Great|Droid+Serif:400,700,400italic|Abel|Oswald:400,300,700);

body {
    font-family:Abel, Calibri, Helvetica, sans-serif;
    font-size:95%;
}

JavaScript

var chart;
var width     = 0.5;
var show      = false;
var avgColor  = 'rgba(204, 0, 0, 0.9)';
var dashStyle = 'LongDash';

$(function() {
    $('#container').highcharts({
        chart       : { type    : 'column' },
        title       : { text    : 'Calculate Mean of all Visible Series' },
        subtitle    : { text    : 'Update on Legend Click' },
        legend      : { enabled : true },
        tooltip     : { shared  : true },
        plotOptions : {
            series  : {
                fillOpacity: 0.1,
                pointPadding:0,
                groupPadding:0.2,
                borderWidth:0.5,
                borderColor:'rgba(255,255,255,0.5)',
                events: {
                    legendItemClick: function(e) {
                        e.preventDefault();
                        this.setVisible();
                        getAverage(e.target.chart, show, width, avgColor, dashStyle);	
                    }
                }
            }
        },
        xAxis      : { allowDecimals : false },
        yAxis      : {  }
    });	
    chart = $('#container').highcharts();

    chart.addSeries({ data: randomData(7, true,  50) });
    chart.addSeries({ data: randomData(7, true,  40) });
    chart.addSeries({ data: randomData(7, true,  30) });
    chart.addSeries({ data: randomData(7, true,  20) });
    chart.addSeries({ data: randomData(7, true,  10) });
    getAverage(chart, show, width, avgColor, dashStyle);
    
})
function getAverage(chart, show=false, width=0.5, avgColor='rgba(204,0,0,.75)', dashStyle='ShortDash') 
{
    //loop through visible series data and build total/count
    //to calculate average from
        
    var total = 0;
    var count = 0;
    $.each(chart.series, function(i,series) {
        if(series.visible === true && series.name != 'average') {
             $.each(series.data, function(i,point) {
                total += point.y;
                count++;
            });
        }
    });
    var average = (total /...