x-axis tickmarks start+step

by kzoon

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px"></div>

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    xAxis: {
gridLineWidth:1,

        tickmarkPlacement: 'on',
     
        tickPositions: [2, 6, 10,14],

        categories: [
            'Q.3 2009',
            'Q.4 2009',
            'Q.1 2010',
            'Q.2 2010',
            'Q.3 2010',
            'Q.4 2010', 
            'Q.1 2011',
            'Q.2 2011',
            'Q.3 2011',
            'Q.4 2011',
        'Q.1 2012',
            'Q.2 2012',
            'Q.3 2012',
            'Q.4 2012',     
 'Q.1 2013',
            'Q.2 2013'






            ]
    },

    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4, 34,66.1,24.5,44]}]
});