html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var dataTable = anychart.data.table();

    dataTable.addData(get_dji_daily_short_data());

​

    var mapping = dataTable.mapAs({value: 1});

​

    var chart = anychart.stock();

    chart.padding(10, 10, 10, 50);

​

    var indicator = dataTable.createComputer(mapping);

    indicator.addOutputField("customField", "uid");

    indicator.setContext({period: 2000, queue: 257});

​

    // Sets initial function.

    indicator.setStartFunction(function (context) {

        context.period *= 2;

    });

    indicator.setCalculationFunction(function (row) {

        row.set("customField", row.get("value") + this.period);

    });

​

    var indicatorMapping = dataTable.mapAs({value: "uid"});

​

    var plot = chart.plot();

    plot.column(mapping);

    plot.line(indicatorMapping);

    plot.getSeries(1).name("Custom indicator");

​

    chart.container("container");

    chart.draw();

});