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javascriptsvggoogle-visualizationjsapi

Plot vertical lines with different colors on area chart, google charts

I am trying to plot an area chart which have vertical lines for each date. I want to represent each line with different color.

Please refer image below for details.

enter image description here

Please check my code below. $session variable contains the json data which represents graph.

$session = 
[["Date",{"role":"annotation"},"Value"],["2015-06-07",null,861],["2015-06-08",null,1381],["2015-06-09",null,2351],["2015-06-10",null,2125],["2015-06-11",null,1970],["2015-06-12",null,1745],["2015-06-13",null,1079],["2015-06-14",null,1087],["2015-06-15",null,2221],["2015-06-16",null,2176],["2015-06-17","Test ",1918],["2015-06-18",null,1826],["2015-06-19",null,1720],["2015-06-20",null,937],["2015-06-21",null,1094],["2015-06-22",null,2170],["2015-06-23",null,2085],["2015-06-24",null,1952],["2015-06-25",null,1865],["2015-06-26",null,1674],["2015-06-27",null,977],["2015-06-28",null,1005],["2015-06-29",null,2130],["2015-06-30",null,1913],["2015-07-01",null,1774],["2015-07-02",null,1891],["2015-07-03",null,1572],["2015-07-04",null,979],["2015-07-05",null,1024],["2015-07-06",null,2163],["2015-07-07",null,2041]]


<html>
    <head>
        <script type="text/javascript" src="https://www.google.com/jsapi"></script>
        <script type="text/javascript">

            function drawVisualization() {

                var session_data = <?php echo $session_data; ?>;

                for (var index = 0; index < session_data.length; index++) {
                    session_data[index][0] = new Date(session_data[index][0]);
                }

                var data = google.visualization.arrayToDataTable(session_data);

                var chart = new google.visualization.AreaChart(document.querySelector('#linechart_material'));
                chart.draw(data, {
                    width: 1600,
                    height: 600,
                    annotation: {
                        1: {
                            style: 'line',
                            color: 'black'
                        },
                        2:{
                            style: 'line',
                            color: 'blue'

                        }
                    },
                    vAxis: {
                        gridlines: {
                            color: 'none'
                        },
                        baselineColor: 'green'
                    },
                    hAxis: {
                        gridlines: {
                            color: 'none'
                        }
                    },
                    series: {
                        0: {color: '#e7711b'},
                        1: {color: '#e2431e'},
                        2: {color: '#f1ca3a'},
                        3: {color: '#6f9654'},
                        4: {color: '#1c91c0'},
                        5: {color: '#43459d'},
                    }
                });
            }
            google.load('visualization', '1', {packages: ['corechart'], callback: drawVisualization});
        </script>
    </head>
    <body>
        <div id="linechart_material"></div>
    </body>
</html>

Please check js fiddle - http://jsfiddle.net/sashant9/24qo18to/1/

Solution

  • You need stemColor property of annotations to color those lines.

    annotations: {
    stemColor: 'red'
}

    Here is the updated Fiddle. For more options to edit the annotations, find the documentation here