Gauge Chart

A library for creating nice and flexible gauge charts.

Demo

Installation

The easiest way to get started is to install it via npm. When you import it in you code, then by default it will use CommonJS module.

  npm install gauge-chart

const GaugeChart = require('gauge-chart')

You can also import the library as ES Module:

import * as GaugeChart from 'https://unpkg.com/gauge-chart@next/dist/bundle.mjs'

Usage

Create an element for positioning gauge in your html file:

<div id="gaugeArea"></div>

Now you're ready to draw your own gauge.

Just copy this code into your Javascript or Typescript file or into <script> </script> tags in HTML file:

// Element inside which you want to see the chart
let element = document.querySelector('#gaugeArea')

// Properties of the gauge
let gaugeOptions = {
  hasNeedle: true,
  needleColor: 'gray',
  needleUpdateSpeed: 1000,
  arcColors: ['rgb(44, 151, 222)', 'lightgray'],
  arcDelimiters: [30],
  rangeLabel: ['0', '100'],
  centralLabel: '50',
}

// Drawing and updating the chart
GaugeChart.gaugeChart(element, 300, gaugeOptions).updateNeedle(50)

Result:

By default, the needle is pointing to 0, thus in order to move it you have to use .updateNeedle(val), where val denotes the value on the chart.

Feel free to change or delete any of the gaugeOptions properties as long as their values are in permitted ranges.

Options

gaugeOptions: { ... }

Name	Values Ranges	Description
hasNeedle	true / false	determines whether to show the needle or not
needleColor	value supported by CSS	colorizes needle with specified colors
needleUpdateSpeed	number ⩾ 0	determines the speed of needle update animation
arcColors	array of values supported by CSS	colorizes gauge with specified color
arcDelimiters	array of numbers from 0 to 100	specifies delimiters of the gauge in ascending order
arcOverEffect	true / false	determines if over effect on ars is enabled or not
arcLabels	array of strings	specifies labels to be placed at delimiters ends
arcPadding	number	specifies padding between arcs (in pixels)
arcPaddingColor	value supported by CSS	color of the padding between delimeters
rangeLabel	array of two strings	depicts gauge ranges on both sides of the chart
centralLabel	string	depicts gauge inner label
labelsFont	string	specifies font-family to be used for labels

.gaugeChart( ... )

Name	Values Ranges	Description
element	html element	specifies an element which contains a chart
chartWidth	number larger than 0	gives a width to the gauge (height is always 0.5 * chartWidth)
gaugeOptions	object	provides gauge properties (can be empty)

.updateNeedle( ... )

Name	Values Ranges	Description
needleValue	number from 0 to 100	specifies needle value on the gauge

Examples

Some examples of what you can get out of the library using different properties:

Contributing

Build the library with npm run build. This will compile the dist files. To see the examples locally you can start a web server with npm run dev.

Authors

Alexey Karpov, Maxim Maltsev.