html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var chart = anychart.line([6, 10, 18, 11, 9]);

    chart.yScale().minimum(0);

    chart.xScale("linear");

​

    var controller = chart.annotations();

​

    var annotation = controller.verticalLine();

    annotation.xAnchor(2);

​

    // Set hover stroke.

    annotation.hoverStroke(function () {

        return "3 " + this.sourceColor;

    });

​

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

    chart.container("container");

    chart.draw();

});