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 [email protected]

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.