Html5-canvas-snow-effect

Developer
Mariam Massadeh
Size
2,609 Kb
Views
42,483

How do I make an html5-canvas-snow-effect?

From http://thecodeplayer.com/walkthrough/html5-canvas-snow-effect. 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 22 September 2022, Thursday.

Html5-canvas-snow-effect Previews
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Html5-canvas-snow-effect - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<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>

Html5-canvas-snow-effect - Script Codes 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 - Script Codes 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++)	{	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);
}
Html5-canvas-snow-effect - Script Codes
Html5-canvas-snow-effect - Script Codes
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Developer Mariam Massadeh
Username MariamMassadeh
Uploaded September 22, 2022
Rating 3
Size 2,609 Kb
Views 42,483
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