A 'stacked' range Line chart

This is an example of how you can manipulate the data that you give to a range chart so that you get a stacking effect. There are actually three Line charts here - one on top of the other.

[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.tooltips.js"></script>
<script src="RGraph.common.effects.js"></script>
<script src="RGraph.drawing.poly.js"></script>
<script src="RGraph.line.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs" width="600" height="250">
    [No canvas support]
</canvas>
This is the code that generates the chart:
<script>
    data = [[3,5,6,7,4,8,5,9,13,14,16,15,17,18,19,21,24,25,25,26,28,28,27,26,25,25]];
    
    for (var j=1; j<6; j+=2) {
        data[j]   = [];
        data[j+1] = [];
        for (var i=0,len=data[0].length; i<len; i+=1) {
            data[j][i] = data[0][i] + (2 * j);
            data[j+1][i] = data[0][i] + (2 * j);
        }
    }

    line = new RGraph.Line({
        id: 'cvs',
        data: [data[0], data[1]],
        options: {
            filledColors: 'red',
            filled: true,
            filledRange: true,
            colors: ['rgba(0,0,0,0)'],
            linewidth: 1,
            yaxisScaleMax: 50,
            xaxisTickmarksCount: 25,
            marginBottom: 50,
            tickmarksStyle: null
        }
    }).draw();

    line = new RGraph.Line({
        id: 'cvs',
        data: [data[2], data[3]],
        options: {
            filledColors: '#0c0',
            filled: true,
            filledRange: true,
            colors: ['rgba(0,0,0,0)'],
            linewidth: 1,
            yaxisScaleMax: 50,
            xaxisTickmarksCount: 25,
            backgroundGrid: false,
            marginBottom: 50,
            tickmarksStyle: null
        }
    }).draw();

    line = new RGraph.Line({
        id: 'cvs',
        data: [data[4], data[5]],
        options: {
            filledColors: '#66f',
            filled: true,
            filledRange: true,
            colors: ['rgba(0,0,0,0)'],
            linewidth: 1,
            yaxisScaleMax: 50,
            xaxisTickmarksCount: 25,
            backgroundGrid: false,
            marginBottom: 50,
            tickmarksStyle: null
        }
    }).draw();


    line = new RGraph.Line({
        id: 'cvs',
        data: [4,7,8,5,4,6,8,9,12,18,19,17,19,21,22,25,24,26,27,29,28,27,29,33,35,37],
        options: {
        xaxisLabels: ['12th','\r\n13th','14th','\r\n15th','16th','\r\n17th','18th','\r\n19th','20th','\r\n21st','22nd','\r\n23rd','24th','\r\n25th','26th','\r\n27th','28th','\r\n29th','30th','\r\n31st','1st','\r\n2nd','3rd','\r\n4th','5th','\r\n6th'],
            colors: ['black'],
            linewidth: 3,
            yaxisScaleMax: 50,
            xaxisTickmarksCount: 0,
            backgroundGrid: false,
            marginBottom: 50,
            tickmarksStyle: null
        }
    }).draw();
</script>