A dual-scale Thermometer chart

This goes in the documents header:

<script src="RGraph.common.core.js"></script>
<script src="RGraph.drawing.yaxis.js"></script>
<script src="RGraph.bar.js"></script>

Put this where you want the chart to show up:

<canvas id="cvs" width="100" height="400">
    [No canvas support]
</canvas>

This is the code that generates the chart:

<script>
    var thermometer = new RGraph.Thermometer({
        id: 'cvs',
        min: 0,
        max: 20,
        value: 8,
        options: {
            scaleVisible: true,
            gutterLeft: 25
        }
    }).grow();
    
    var coords = thermometer.coords;
    
    var yaxis = new RGraph.Drawing.YAxis({
        id: 'cvs',
        x: coords[0][0],
        options: {
            gutterTop: thermometer.bulbTopCentery,
            gutterBottom: thermometer.canvas.height - (coords[0][1] + coords[0][3]),
            noyaxis: true,
            textColor: 'red',
            max: 100,
            min: 80
        }
    }).draw();
</script>