html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var chart = anychart.line([

        {x: 0, value: 6},

        {x: 1, value: 10},

        {x: 2, value: 18},

        {x: 3, value: 11},

        {x: 4, value: 9}

    ]);

    chart.yScale().minimum(0);

    chart.xScale('linear');

​

    var controller = chart.annotations();

​

    var annotation = controller.verticalLine();

    annotation.xAnchor(2);

​

    // Set stroke.

    annotation.stroke(function () {

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

    });

​

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

    chart.container('container');

    chart.draw();

});