html5-canvas-snow-effect

In this example below you will see how to do a html5-canvas-snow-effect with some HTML / CSS and Javascript

from http://thecodeplayer.com/walkthrough/html5-canvas-snow-effect

Thumbnail
This awesome code was written by MariamMassadeh, you can see more from this user in the personal repository.
You can find the original code on Codepen.io
Copyright MariamMassadeh ©

Technologies

  • HTML
  • CSS
  • JavaScript
<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  <title>html5-canvas-snow-effect</title>
  
  
  
      <link rel="stylesheet" href="css/style.css">

  
</head>

<body>

  <canvas id="canvas"></canvas>
  <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>

  

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




</body>

</html>

/*Downloaded from https://www.codeseek.co/MariamMassadeh/html5-canvas-snow-effect-AbBCt */
/*Simple reset*/
* {margin: 0; padding: 0;}

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

/*Downloaded from https://www.codeseek.co/MariamMassadeh/html5-canvas-snow-effect-AbBCt */
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++)
	{
		particles.push({
			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)";
		ctx.beginPath();
		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);
		}
		ctx.fill();
		update();
	}
	
	//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};
				}
				else
				{
					//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};
					}
					else
					{
						//Enter from the right
						particles[i] = {x: W+5, y: Math.random()*H, r: p.r, d: p.d};
					}
				}
			}
		}
	}
	
	//animation loop
	setInterval(draw, 33);
}

Comments