From What is a html5-canvas-snow-effect How do you make a html5-canvas-snow-effect? This script and codes were developed by Mariam Massadeh on 26 November 2021, Friday.

How do I make an html5-canvas-snow-effect?
  1. Html5-canvas-snow-effect Previews
  2. Html5-canvas-snow-effect HTML Codes
  3. Html5-canvas-snow-effect CSS Codes
  4. Html5-canvas-snow-effect JS Codes
Html5-canvas-snow-effect Previews

Html5-canvas-snow-effect HTML Codes

<!DOCTYPE html>
<html >
  <meta charset="UTF-8">
      <link rel="stylesheet" href="css/style.css">


  <canvas id="canvas"></canvas>
  <script src=''></script>

    <script src="js/index.js"></script>


Html5-canvas-snow-effect CSS Codes

/*Simple reset*/
* {margin: 0; padding: 0;}

body {
	/*You can use any kind of background here.*/
	background: #6b92b9;
canvas {
	display: block;

Html5-canvas-snow-effect JS Codes

window.onload = function(){
	//canvas init
	var canvas = document.getElementById("canvas");
	var ctx = canvas.getContext("2d");
	//canvas dimensions
	var W = window.innerWidth;
	var H = window.innerHeight;
	canvas.width = W;
	canvas.height = H;
	//snowflake particles
	var mp = 25; //max particles
	var particles = [];
	for(var i = 0; i < mp; i++)
			x: Math.random()*W, //x-coordinate
			y: Math.random()*H, //y-coordinate
			r: Math.random()*4+1, //radius
			d: Math.random()*mp //density
	//Lets draw the flakes
	function draw()
		ctx.clearRect(0, 0, W, H);
		ctx.fillStyle = "rgba(255, 255, 255, 0.8)";
		for(var i = 0; i < mp; i++)
			var p = particles[i];
			ctx.moveTo(p.x, p.y);
			ctx.arc(p.x, p.y, p.r, 0, Math.PI*2, true);
	//Function to move the snowflakes
	//angle will be an ongoing incremental flag. Sin and Cos functions will be applied to it to create vertical and horizontal movements of the flakes
	var angle = 0;
	function update()
		angle += 0.01;
		for(var i = 0; i < mp; i++)
			var p = particles[i];
			//Updating X and Y coordinates
			//We will add 1 to the cos function to prevent negative values which will lead flakes to move upwards
			//Every particle has its own density which can be used to make the downward movement different for each flake
			//Lets make it more random by adding in the radius
			p.y += Math.cos(angle+p.d) + 1 + p.r/2;
			p.x += Math.sin(angle) * 2;
			//Sending flakes back from the top when it exits
			//Lets make it a bit more organic and let flakes enter from the left and right also.
			if(p.x > W+5 || p.x < -5 || p.y > H)
				if(i%3 > 0) //66.67% of the flakes
					particles[i] = {x: Math.random()*W, y: -10, r: p.r, d: p.d};
					//If the flake is exitting from the right
					if(Math.sin(angle) > 0)
						//Enter from the left
						particles[i] = {x: -5, y: Math.random()*H, r: p.r, d: p.d};
						//Enter from the right
						particles[i] = {x: W+5, y: Math.random()*H, r: p.r, d: p.d};
	//animation loop
	setInterval(draw, 33);
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