SVG Pie charts configured to look like meters

Here we have three Pie charts that have been configured to look like gauges showing percentages. They're regular Pie charts with two colours but then a big black circle is added over the top which makes them look like donut charts (somewhat). And finally the text is added to the center in the draw event.

This goes in the documents header:

<script src="RGraph.svg.common.core.js"></script>
<script src="RGraph.svg.hbar.js"></script>
<script src="RGraph.svg.pie.js"></script>

Put this where you want the chart to show up:

<style>
    div#meters{
        position: relative;
        background-color: black;
        height: 425px;
    }

    div#meters div {
        float: left;
        width: 300px;
        height: 300px;
    }
    
    
    div#chart-container4,
    div#chart-container5,
    div#chart-container6 {
        position: absolute !important;
        left: 0 !important;
        top: 280px !important;
        width: 900px !important;
        height: 70px !important;
    }
    
    div#chart-container5 {top: 310px !important;}
    div#chart-container6 {top: 340px !important;}
</style>

<div id="meters">
    <div id="chart-container1"></div>
    <div id="chart-container2"></div>
    <div id="chart-container3"></div>
    <div id="chart-container4"></div>
</div>

This is the code that generates the chart:

<script>
    pie1 = new RGraph.SVG.Pie({
        id: 'chart-container1',
        data: [15,85],
        options: {
            colors: ['red', 'transparent'],
            donut: true,
            donutWidth: 20
        }
    }).on('draw', function (obj)
    {
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'circle',
            parent: obj.layers.background1,
            attr: {
                cx: obj.centerx,
                cy: obj.centery,
                r: obj.radius,
                fill: 'gray'
            }
        });
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'circle',
            parent: obj.layers.background1,
            attr: {
                cx: obj.centerx,
                cy: obj.centery,
                r: obj.radius - obj.properties.donutWidth,
                fill: 'black'
            }
        });

        // Add the text label
        RGraph.SVG.text({
            object: obj,
            parent: obj.svg.all,
            text:   obj.data[0] + '%',
            x:      obj.centerx,
            y:      obj.centery,
            halign: 'center',
            valign: 'center',
            size:   45,
            bold: true,
            color:  '#999'
        });

        // Add the text label of the name
        RGraph.SVG.text({
            object: obj,
            parent: obj.svg.all,
            text:   'Charles',
            x:      obj.centerx,
            y:      obj.centery + 20,
            halign: 'center',
            valign: 'top',
            size:   16,
            bold: true,
            color:  '#999'
        });
    }).roundRobin({frames: 45});

    new RGraph.SVG.Pie({
        id: 'chart-container2',
        data: [50,50],
        options: {
            colors: ['red', 'transparent'],
            donut: true,
            donutWidth: 20
        }
    }).on('draw', function (obj)
    {
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'circle',
            parent: obj.layers.background1,
            attr: {
                cx: obj.centerx,
                cy: obj.centery,
                r: obj.radius,
                fill: 'gray'
            }
        });
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'circle',
            parent: obj.layers.background1,
            attr: {
                cx: obj.centerx,
                cy: obj.centery,
                r: obj.radius - obj.properties.donutWidth,
                fill: 'black'
            }
        });

        // Add the text label
        RGraph.SVG.text({
            object: obj,
            parent: obj.svg.all,
            text:   obj.data[0] + '%',
            x:      obj.centerx,
            y:      obj.centery,
            halign: 'center',
            valign: 'center',
            size:   45,
            bold: true,
            color:  '#999'
        });

        // Add the text label of the name
        RGraph.SVG.text({
            object: obj,
            parent: obj.svg.all,
            text:   'Ricky',
            x:      obj.centerx,
            y:      obj.centery + 20,
            halign: 'center',
            valign: 'top',
            size:   16,
            bold: true,
            color:  '#999'
        });
    }).roundRobin({frames: 45});


    new RGraph.SVG.Pie({
        id: 'chart-container3',
        data: [42,58],
        options: {
            colors: ['red', 'transparent'],
            donut: true,
            donutWidth: 20
        }
    }).on('draw', function (obj)
    {
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'circle',
            parent: obj.layers.background1,
            attr: {
                cx: obj.centerx,
                cy: obj.centery,
                r: obj.radius,
                fill: 'gray'
            }
        });
        RGraph.SVG.create({
            svg: obj.svg,
            type: 'circle',
            parent: obj.layers.background1,
            attr: {
                cx: obj.centerx,
                cy: obj.centery,
                r: obj.radius - obj.properties.donutWidth,
                fill: 'black'
            }
        });

        // Add the text label of the value
        RGraph.SVG.text({
            object: obj,
            parent: obj.svg.all,
            text:   obj.data[0] + '%',
            x:      obj.centerx,
            y:      obj.centery,
            halign: 'center',
            valign: 'center',
            size:   45,
            bold: true,
            color:  '#999'
        });

        // Add the text label of the name
        RGraph.SVG.text({
            object: obj,
            parent: obj.svg.all,
            text:   'Freddy',
            x:      obj.centerx,
            y:      obj.centery + 20,
            halign: 'center',
            valign: 'top',
            size:   16,
            bold: true,
            color:  '#999'
        });
    }).roundRobin({frames: 45});

    // The configuration for the red bars
    conf = {
        xaxis: false,
        xaxisScale: false,
        xaxisMax: 100,
        xaxisLabels: false,
        yaxis: false,
        colors: ['red'],
        gutterTop: 40,
        gutterBottom: 5,
        backgroundGrid: false
    };

    

    // Gray backgrounds for the progress bars
    new RGraph.SVG.HBar({id: 'chart-container4', data: [100], options: conf}).on('beforedraw', function (obj) {var prop = obj.properties;prop.colors = ['gray'];prop.title = 'Overall 16%';prop.titleSize = 22;prop.titleColor = '#666';prop.titleBold = true;}).draw();
    new RGraph.SVG.HBar({id: 'chart-container5', data: [100], options: conf}).on('beforedraw', function (obj) {obj.properties.colors = ['gray']}).draw();
    new RGraph.SVG.HBar({id: 'chart-container6', data: [100], options: conf}).on('beforedraw', function (obj) {obj.properties.colors = ['gray']}).draw();

    // The red bars
    new RGraph.SVG.HBar({id: 'chart-container4', data: [16], options: conf}).grow();
    new RGraph.SVG.HBar({id: 'chart-container5', data: [88], options: conf}).grow();
    new RGraph.SVG.HBar({id: 'chart-container6', data: [74], options: conf}).grow();
</script>