anychart.onDocumentReady(function () {
var chart = anychart.area();
var series = chart.stepArea([
{x: 'January', value: 125},
{x: 'February', value: 132},
{x: 'March', value: 141},
{x: 'April', value: 158},
series.hatchFill('backward-diagonal', '#FFFFFF', 1, 20);
chart.title('Set hatch fill parameters');
chart.container('container');