html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var chart = anychart.polar();

​

    var series = chart.polyline([

        {x: 0, value: 6},

        {x: 1, value: 4},

        {x: 2, value: 6},

        {x: 3, value: 3},

        {x: 4, value: 6},

        {x: 5, value: 4}

    ]);

​

    // Set stroke.

    series.stroke(function () {

        return "3 " + anychart.color.darken(this.sourceColor);

    });

​

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

    chart.container("container");

    chart.draw();

});