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- Highcharts - Angular Gauges
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Highcharts - VU Meter Chart
We have already seen the configuration used to draw a chart in Highcharts Configuration Syntax chapter.
An example of a Gauge with dual axes is given below.
Configurations
Let us now see the additional configurations/steps taken.
chart.type
Configure the chart type to be gauge based. Set the type as 'gauge'.
var chart = { type: 'guage' };
pane
Applies only to polar charts and angular gauges. This configuration object holds general options for the combined X and Y axes set. Each xAxis or yAxis can reference the pane by index.
var pane = { startAngle: -150, endAngle: 150 };
Example
highcharts_vumeter.htm
<html> <head> <title>Highcharts Tutorial</title> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"> </script> <script src = "https://code.highcharts.com/highcharts.js"></script> <script src = "https://code.highcharts.com/highcharts-more.js"></script> </head> <body> <div id = "container" style = "width: 550px; height: 400px; margin: 0 auto"></div> <script language = "JavaScript"> $(document).ready(function() { var 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 }; var credits = { enabled: false }; var title = { text: 'VU meter' }; var pane = [ { startAngle: -45, endAngle: 45, background: null, center: ['25%', '145%'], size: 300 }, { startAngle: -45, endAngle: 45, background: null, center: ['75%', '145%'], size: 300 } ]; var 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 } } ]; var plotOptions = { gauge: { dataLabels: { enabled: false }, dial: { radius: '100%' } } }; var series = [ { data: [-20], yAxis: 0 }, { data: [-20], yAxis: 1 } ]; var json = {}; json.chart = chart; json.credits = credits; json.title = title; json.pane = pane; json.yAxis = yAxis; json.plotOptions = plotOptions; json.series = series; // Add some life var chartFunction = 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); }; $('#container').highcharts(json, chartFunction); }); </script> </body> </html>
Result
Verify the result.
highcharts_angular_gauges.htm
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