Highcharts VU Meter Chart

In the previous chapters, we learned how to setup highcharts library and how to create a chart with required configurations using highcharts library in our webpage. Now, we will learn how to create a vu meter chart using highcharts library with examples.

Highcharts VU Meter Chart Example

Following is the example of creating a VU meter chart by setting the required chart properties using highcharts library.

 

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<html>

<head>

    <title>Highcharts VU Meter Chart</title>

    <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>

    <script src="https://code.highcharts.com/highcharts.js"></script>

    <script src="https://code.highcharts.com/highcharts-more.js"></script>

    <script src="https://code.highcharts.com/modules/exporting.js"></script>

    <script type="text/javascript">

        $(function() {

            Highcharts.chart('container', {

                    chart: {

                        type: 'gauge',

                        plotBorderWidth: 1,

                        plotBackgroundColor: {

                            linearGradient:  { x1: 0, y1: 0, x2: 0, y2: 1 },

                            stops: [[0, '#FFF4C6'], [0.3, '#FFFFFF'], [1, '#FFF4C6']]

                        },

                        plotBackgroundImage: null,

                        height: 200

                    },

                    title: {

                        text: 'VU meter'

                    },

                    pane: [{

                        startAngle: -45,

                        endAngle: 45,

                        background: null,

                        center: ['25%', '145%'],

                        size: 300

                    }, {

                        startAngle: -45,

                        endAngle: 45,

                        background: null,

                        center: ['75%', '145%'],

                        size: 300

                    }],

                    tooltip: {

                        enabled: false

                    },

                    yAxis: [{

                        min: -20,

                        max: 6,

                        minorTickPosition: 'outside',

                        tickPosition: 'outside',

                        labels: {

                            rotation: 'auto',

                            distance: 20

                        },

                        plotBands: [{

                            from: 0,

                            to: 6,

                            color: '#C02316',

                            innerRadius: '100%',

                            outerRadius: '105%'

                        }],

                        pane: 0,

                        title: {

                            text: 'VU<br/><span style="font-size:8px">Channel A</span>',

                            y: -40

                        }

                    }, {

                        min: -20,

                        max: 6,

                        minorTickPosition: 'outside',

                        tickPosition: 'outside',

                        labels: {

                            rotation: 'auto',

                            distance: 20

                        },

                        plotBands: [{

                            from: 0,

                            to: 6,

                            color: '#C02316',

                            innerRadius: '100%',

                            outerRadius: '105%'

                        }],

                        pane: 1,

                        title: {

                            text: 'VU<br/><span style="font-size:8px">Channel B</span>',

                            y: -40

                        }

                    }],

                    plotOptions: {

                        gauge: {

                            dataLabels: {

                                enabled: false

                            },

                            dial: {

                                radius: '100%'

                            }

                        }

                    },

                    series: [{

                        name: 'Channel A',

                        data: [-20],

                        yAxis: 0

                    }, {

                        name: 'Channel B',

                        data: [-20],

                        yAxis: 1

                    }]

                },

                // Let the music play

                function(chart) {

                    setInterval(function() {

                        if (chart.series) { // the chart may be destroyed

                            var left = chart.series[0].points[0],

                                right = chart.series[1].points[0],

                                leftVal,

                                rightVal,

                                inc = (Math.random() - 0.5) * 3;

                            leftVal = left.y + inc;

                            rightVal = leftVal + inc / 3;

                            if (leftVal < -20 || leftVal > 6) {

                                leftVal = left.y - inc;

                            }

                            if (rightVal < -20 || rightVal > 6) {

                                rightVal = leftVal;

                            }

                            left.update(leftVal, false);

                            right.update(rightVal, false);

                            chart.redraw();

                        }

                    }, 500);

                });

        });

    </script>

</head>

<body>

    <div id="container"> </div>

</body>

</html>

If you observe the above example, we created a VU meter chart using highcharts library with required properties.

 

When we execute the above highcharts example, we will get the result like as shown below.

 

Highcharts vu meter example result

 

This is how we can create a VU meter chart using highcharts library with required properties.

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