Sparticles

javascript particles in canvas

https://sparticlesjs.dev

Lightweight, High Performance Particles in Canvas.
^{For those occasions when you 👏 just 👏 gotta 👏 have 👏 sparkles,
snow, or stars on your homepage!}

installation
parameters
options
methods
styling
performance
why?

installation

Depending on how your project looks,

you may want to include a direct link to the script and then initialise the sparkles,
or you may want to import the module in to your application for a more modern approach.

vanilla

firstly make sure you've downloaded the latest version of the script to your application directory (if you are running on a CMS you might also need to upload the file to your server). The file you'll want to use is; dist/sparticles.min.js to make sure it downloads the fastest for your users.
After you've downloaded, or uploaded, the sparticles.min.js file to the correct place, you'll then need to include it in your web page;

<script src="../path/to/sparticles.min.js"></script>

And finally, you should then be able to initialise the Sparticles by running this code in your javascript;
^{(make sure this code runs after you've included the script above.)}

<script>
  window.onload = function() {
    let myElement = document.getElementById("myDiv");
    let mySparticles = new Sparticles(myElement, { count: 100 }, 400);
  }
</script>

jquery

For jQuery sites, you may follow all of the steps above, but replace the third step with something like below;

<script>
  let $el = $("#myDiv");
  let mySparticles = new Sparticles($el[0], { count: 100 }, 400);
</script>

app / bundler

If you're running a more modern type of application with something like Svelte or VueJs;

First you will want to install the module with NPM;

yarn add --dev sparticles
# or npm, if you prefer
npm install --save-dev sparticles

Then import the module in to the app where you want to use it

import Sparticles from "sparticles";

Finally initialise with vanillaJS

new Sparticles(node, { count: 100 }, 400);

If you're using SvelteJS specifically, then your single-file component would look a little like this;

<script>

  import Sparticles from "sparticles";

  let sparticles,
      options = { color: "gold", shape: "star", speed: 50 };

  function addSparticles(node) {
    new Sparticles(node, options, 400);
  }

</script>

<main use:addSparticles>
</main>

usage

Providing that the script/module has been properly included, then it can be initialised by running the Sparticles() constructor;

let mySparticles = new Sparticles();

parameters

When initialising the Sparticles instance there are some parameters that can be supplied.

parameter	type	default	description
node	`HTMLElement`	`document.body`	the element in the DOM which the Sparticles will append to
options	`Object`	`{}`	an object with all the options for the instance
width	`Number`	`node.clientWidth`	the width of the canvas element
height	`Number`	`node.clientWidth`	the height of the canvas element (defaults to width)

^{Leave the width/height properties empty to make the canvas resize to fit it's node}

Supply nothing and get a default Sparticle instance on the <body>

let mySparticles = new Sparticles();

Supply a single HTMLElement parameter for a default Sparticle instance on that element

let mySparticles = new Sparticles(document.getElementById("myDiv"));

Supply a single Object parameter to customise a Sparticle instance on the <body>

let mySparticles = new Sparticles({ color: "red" });

Supply the width and height parameters for a custom size

let mySparticles = new Sparticles({ color: "red" }, 400, 300);

options

A brief look at all the options, with more details below.

option	type	default	description
composition	`String`	`source-over`	canvas globalCompositeOperation value for particles
count	`Number`	`50`	number of particles on the canvas simultaneously
speed	`Number`	`10`	default velocity of every particle
parallax	`Number`	`1`	speed multiplier effect for larger particles (0 = none)
direction	`Number`	`180`	default direction of particles in degrees (0 = ↑, 180 = ↓)
xVariance	`Number`	`2`	random deviation of particles on x-axis from default direction
yVariance	`Number`	`2`	random deviation of particles on y-axis from default direction
rotate	`Boolean`	`true`	can particles rotate
rotation	`Number`	`1`	default rotational speed for every particle
alphaSpeed	`Number`	`10`	rate of change in alpha over time
alphaVariance	`Number`	`1`	random deviation of alpha change
minAlpha	`Number`	`0`	minumum alpha value of every particle
maxAlpha	`Number`	`1`	maximum alpha value of every particle
minSize	`Number`	`1`	minimum size of every particle
maxSize	`Number`	`10`	maximum size of every particle
bounce	`Boolean`	`false`	should the particles bounce off edge of canvas
drift	`Number`	`1`	the "driftiness" of particles which have a horizontal/vertical direction
glow	`Number`	`0`	the glow effect size of each particle
twinkle	`Boolean`	`false`	particles to exhibit an alternative alpha transition as "twinkling"
style	`String`	`fill`	fill style of particles (one of; "fill", "stroke" or "both")
shape	`String`/`Array`	`circle`	shape of particles (any of; circle, square, triangle, diamond, line, image) or "random"
color	`String`/`Array`	`random`	css color as string, or array of color strings (can also be "random")
randomColor	`Function`	`randomHsl()`	function for returning a random color when the color is set as "random"
randomColorCount	`Number`	`3`	number of random colours when the color is set as "random"
imageUrl	`String`/`Array`		if shape is "image", define an image url (can be data-uri, should be square (1:1 ratio))

`composition`

Type: String
Default: source-over
Possible: see list here

The global render composition when rendering particles on top of one-another. This, however, is a very expensive operation when set to anything other than the default value (source-over), and will ultimately degrade performance, especially with many particles.

Will accept any of the values that are provided as part of the Canvas API

`count`

Type: Number
Default: 50
Range: 1 - 10000

Simply the number of particles drawn to the screen.
Values over 500 may begin to degrade performance.

`speed`

Type: Number
Default: 10
Range: 0 - 100

The base value of speed across all particles. This is modified by options such as parallax and [x/y]Variance to determine the final velocity of each individual particle. A speed of 0 will render particles stationary before applying [x/y]Variance.

`parallax`

Type: Number
Default: 1
Range: 0 - 20

A value to apply more speed to larger particles, and less speed to smaller particles, creating an effect which makes larger particles appear closer to the screen.

`direction`

Type: Number
Default: 180
Range: 0 - 360

The base angle (in degrees) at which the particles are travelling, so long as they have a speed value.

`xVariance`

Type: Number
Default: 2
Range: 0 - 20

How much variance is applied between particles on the X axis. A value of 0 will make all particles appear to be going completely parallel, and look unnatural.

Can be used in conjunction with speed: 0; to make particles which float randomly in space.

`yVariance`

Type: Number
Default: 2
Range: 0 - 20

How much variance is applied between particles on the Y axis. A value of 0 will make all particles appear to be going completely parallel, and look unnatural.

Can be used in conjunction with speed: 0; to make particles which float randomly in space.

`rotate`

Type: Boolean
Default: true

Toggle whether the particles are allowed to spin about their axis.

`rotation`

Type: Number
Default: 1
Range: 0 - 20

How fast the particles can spin about their axis, this has a random multiplier added per-particle which prevents a completely unnatural spinning effect.

`alphaSpeed`

Type: Number
Default: 10
Range: 0 - 50

Rate of change for the alpha value of all particles. A higher value will encourage the particles to flicker like candle lights. A value of 0 will disable alpha change.

`alphaVariance`

Type: Number
Default: 2
Range: 0 - 10

How much variance is applied between each particle on the alpha value change over time. A value of 0 will cause all particles to change alpha at the same rate, a higher value will introduce more variety.

`minAlpha`

Type: Number
Default: 0
Range: -5 - +1

The minimum alpha value a particle can change to. The lower the number the longer it will stay invisible on the canvas, this could be useful in some scenarios where the particle should fade out for a while.

Must be lower than the maxAlpha value.

`maxAlpha`

Type: Number
Default: 0
Range: 0 - +5

The maximum alpha value a particle can change to. The higher the number the longer it will stay visible on the canvas, this could be useful in some scenarios where the particle should stay at max alpha for a time.

Must be higher than the minAlpha value.

`minSize`

Type: Number
Default: 1
Range: 1 - 100

Minimum size (in pixels) of the particles. The actual size of each particle is variable between the minSize and maxSize. If the minSize and maxSize are the same value; then all particles will be uniformly sized.

`maxSize`

Type: Number
Default: 10
Range: 1 - 100

Maximum size (in pixels) of the particles. The actual size of each particle is variable between the minSize and maxSize. If the minSize and maxSize are the same value; then all particles will be uniformly sized.

`style`

Type: String
Default: "fill"
Values: "fill", "stroke" or "both"

Particles can be either stroked (outline) or filled (solid) and this setting determines that style. It's also possible to randomize the style by choosing "both"

`bounce`

Type: Boolean
Default: false

Determine if particles should bounce off the boundaries of the canvas instead of resetting to the opposite side. This is best used with speed: 0; and a high value for [x/yVariance] to create a chaotic effect.

`drift`

Type: Number
Default: 1
Range: 1 - 20

How much a particle will "drift" as it falls. This is to imply a floatiness/wind effect like seen with snow flakes, or leaves. The drift will only apply if speed > 0 and direction is near to a 90degree value (0, 90, 180, 270)

`glow`

Type: Number
Default: 0
Range: 0 - 50

Glow (or shadow) effect around the particle. This will not affect images.

`twinkle`

Type: Boolean
Default: false

Apply a "twinkle" effect to the particle when changing alpha. This works best with a higher alphaSpeed and alphaVariance value.

`color`

Type: String / Array<String>
Default: "random"
Values: any valid css/html color string

A CSS/HTML color string to apply across all particles.
If an array of colors ([ "#ff0", "red", "hsl(10,50%,50%)" ]) is given, then each particle will be assigned a random color from the array. Additionally "random" can be used to assign any random color.

`randomColor`

Type: Function
Default: randomHSL()
Arguments: index, total

Custom function to use when generating random colors. The default function will return a fairly pleasant hsl() color with a high saturation and medium lightness. This can be overridden to suit your environment better. The two arguments (index, total) are Integers and allow for a little psuedo-randomizing.

example:

randomColor: function( index, total ) {
	return `hsl( ${index}, 80%, ${total - index}% )`;
}

`randomColorCount`

Type: Number
Default: 3
Range: 1 - 50

How many random colors to generate when color is random. The more colors generated the more chance there is of a performance penalty. It should be OK up to 50.

`shape`

Type: String / Array<String>
Default: "circle"
Values: "circle", "square", "triangle", "line", "diamond", "star" or "image"

Determine the shape of all the particles.
If an array of shapes ([ "circle", "star", "diamond" ]) is given, then each particle will be assigned a random shape form the array. Additionally "image" can be used to define a custom particle shape from an image when combined with imageUrl.

`imageUrl`

Type: String / Array<String>
Default: ""
Values: a valid url, or data-uri

Determine the custom image to be used for all the particles. If an array of urls ([ "http://my.image/shape.png", "http://my.svg/shape.svg" ]) is given, then each particle will be assigned a random image as it's shape from the array. ^{This image should be a square (1:1)}

ℹ imageUrl only has an effect if a shape in the array is; "image".
ℹ imageUrl can accept svg, but the <svg> root needs a width/height. (see issue);

methods

a few public methods can be accessed by storing a reference to the Sparticles instance and executed like so;

let mySparticles = new Sparticles();
mySparticles.destroy();

method	description
destroy()	destroy the Sparticles instance and remove event listeners
setCanvasSize( width, height )	set the new size of the canvas
resetSparticles()	reset all the particles on the canvas

styling

If the Sparticles are simply going to be placed in a container (like a <div>) then the only styling that should be necessary is to set the width/height of the canvas using the width and height parameters.

To place the Sparticles in the background of a web-page, you'll need to add a container to the <body> which the canvas can sit in, then position it fixed:

<html>
  <body>
    <!-- your html web page content -->
    <div class="sparticles-container"></div>
  </body>
</html>

Then we set up the CSS styling for the Sparticles container depending on our situation:

/** 
  * we need to make sure the background doesn't have a
  * background color as we want to place the container
  * behind it on the z-axis!
  */
html { background: black; }
body { background: transparent; }

.sparticles-container {
  position: fixed;
  left: 0; right: 0;
  top: 0; bottom: 0;
  /**
   * z-index: -1; this makes the <body> still interactive 
   * by placing the sparticles behind the content
   */
  z-index: -1; 
}
/**
* we could a;so use "pointer-events: none;" in
* modern browsers to put the particles on top of all our content
*/
@supports ( pointer-events: none ) {
  .sparticles-container {
    z-index: 2;
    pointer-events: none;
  }
}

Finally we can initiate the Sparticles with the .sparticles-container as the DOM element it's bound to:

let container = document.querySelector(".sparticles-container");
let mySparticles = new Sparticles( container, { color: "red" });
// no need for width/height as the  canvas will fill 
// the container which is fixed to the viewport size

performance

Sparticles is really quite fast!

It was designed to be the smallest (within reason) and fastest performing particles script with such a large feature set!

Some other popular particle scripts will eat up to 50% of your CPU to render 1,000 particles. Sparticles will do the same while only using 9% and will run at a buttery 120fps if your device can refresh that fast!

Sparticles was built because other offerings in the space were either doing way too much and adding too many kb to load, or they were just too slow and unable to serve enough particles to lower end devices without chugging along jankily!

I used to get a lot of requests from Editorial/Content teams who wanted snow/sparkles/whatever on their home page during events, and I either had to reject because the plugins were killing our user's devices or accept and live knowing I've failed the users/customers! 😢 ~~ so Sparticles should fix that!

mobile

ℹ It's quite easy to achieve 120fps+ with over 1,000 particles on a decent computer!
⚠ But please remember your users are not all running super-computers with GPUs, they are probably on a mobile phone. Please avoid running heavy animations on phones! If you really have to then I'd advise reducing the particles down to 100 or less for a mobile device!

Please take care of your mobile users! They are probably your primary user if you're running a commercial or non-tech website! use a script like below to determine the amount of particles based on their device;

  let myElement = document.getElementById("myDiv");
  // PLEASE DON'T PUSH A TON OF ANIMATION ON MOBILES!
  let count = (/Mobi|Android/i.test(navigator.userAgent)) ? 100 : 500;
  let mySparticles = new Sparticles(myElement, { count: count }, 400);

why "Sparticles" ?

particles + [ speed ⚡ | snow ❄ | sparkles ✨ | stars ⭐ ] = Sparticles 🌈

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README.md

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Sparticles

javascript particles in canvas

https://sparticlesjs.dev

installation

vanilla

jquery

app / bundler

usage

parameters

options

composition

count

speed

parallax

direction

xVariance

yVariance

rotate

rotation

alphaSpeed

alphaVariance

minAlpha

maxAlpha

minSize

maxSize

style

bounce

drift

glow

twinkle

color

randomColor

randomColorCount

shape

imageUrl