A Line chart with a highlighted section

Summary: A Line chart with a highlighted section. The highlight is achieved by covering two sides of the chart with a semi-transparent gray rectangle.

Here we have an example of a dark themed SVG Line chart that has a section of it highlighted. The standard Line is a filled Line object that does NOT use the filledAccumulative option - it uses transparency in the colors instead so that you can see datasets at the back of other datasets.

The thing that differentiates this demo is the fact that once rendered there are two rectangles placed over the chart - one on the left-hand-side and one on the right-hand-side. This leaves a section in the middle of those two rectangles that has a highlighted appearance.

As it is on this chart, the section that's highlighted has no real meaning - but this doesn't have to be the case and it could highlight certain entries or a range on the chart (for example it could be a horizontal highlight rectangle).

This goes in the documents header:

<script src="RGraph.svg.common.core.js"></script>
<script src="RGraph.svg.common.key.js"></script>
<script src="RGraph.svg.line.js"></script>

Put this where you want the chart to show up:

<div style="width: 600px; height: 250px; display: inline-block; background-color: black"></div>

This is the code that generates the chart:

<script>
    new RGraph.SVG.Line({
        id: 'cc',
        data: [
            [22,45,56,53,45,23,12,19,43,56,56,76,64,35,22],
            [13,18,33,23,43,45,56,43,45,12,45,53,56,56,51],
            [48,56,45,35,21,56,48,45,45,56,53,65,35,22,21],
            [12,23,25,22,21,32,24,21,12,53,12,32,22,33,12]
        ],
        options: {
            spline: true,
            filled: true,
            colors: [
                'rgba(146,223,179,0.75)',
                'rgba(109,194,189,0.75)',
                'rgba(173,136,190,0.75)',
                'rgba(84,112,133,0.75)'
            ],
            backgroundGridColor: '#666',
            textColor: 'white',
            xaxisLabels: ['Rich','Terry','Fay','Hoolio','Bob','Carl','Pob','Neil','Matt','Kev','Jill','Lou','Luis','Pete','John'],
            key: ['H67','JK89','GB88','SX95'],
            keyLabelsColor: 'white',
            keyLabelsBackground: 'black'
        }
    }).draw().exec(function (obj)
    {
        // These cover the left and right sides of the chart with a dark,
        // semi-transparent rect element
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'rect',
            attr: {
                x: 35,
                y: 35,
                width: 200,
                height: 180,
                fill: 'rgba(0,0,0,0.35)'
            }
        });

        RGraph.SVG.create({
            svg: obj.svg,
            type: 'rect',
            attr: {
                x: obj.width - 200 - 35,
                y: 35,
                width: 200,
                height: 180,
                fill: 'rgba(0,0,0,0.3)'
            }
        });
    });
</script>