html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var chart = anychart.polar();

​

    var series = chart.rangeColumn([

        {x: 1, low: 1, high: 3},

        {x: 2, low: 2, high: 4},

        {x: 3, low: 3, high: 5},

        {x: 4, low: 2, high: 4},

        {x: 5, low: 1, high: 3},

        {x: 6, low: 2, high: 4}

    ]);

​

    // Set stroke.

    series.stroke(function () {

        return anychart.color.setThickness(anychart.color.darken(this.sourceColor), 3);

    });

​

    chart.xScale('ordinal').sortPointsByX(true);

    chart.title('Set stroke parameter as a function');

    chart.container('container');

    chart.draw();

});