Snow Effect Using Javascript

Submitted by jaredgwapo on Wednesday, January 13, 2016 - 16:35.

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This is a simple program that will teach on how to create a snow effect using javascript. You can use this in your projects or systems. Just download the source code below.

Instructions

HTML Code

<!DOCTYPE html>
<html>
<head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title>Snow Demo</title>           
    <style>
        body {
            padding:0; margin:0;
        }
        #demo {
            display: block;
                        width: 100%;
        }
    </style>
</head>
<body>  
<img id="demo" src="sample.jpg" alt="snowy landscape">
<!-- for test only -->
 
<!-- If you add scripts before closing body tag, it will not prevent page
from rendering, thus making your website load faster -->
<script src="jsized.snow/jsized.snow.min.js" type="text/javascript"></script>        
<script>
    /**
     * This function takes 2 arguments
     * First is the path to the directory with snowflake images
     * Second is the maximum number of snowflakes, please do not
     * set this number above 60 as it will impact the performance
     */
    createSnow('jsized.snow/', 100);
</script>
 
</body>
</html>

Javascript Code

/**
 * X-Team Snow
 * @author Andrew Valums
 *
 * Copyright (c) 2009 X-Team, http://x-team.com
 */
(function(){function k(a,b,c){if(a.addEventListener)a.addEventListener(b,c,false);else a.attachEvent&&a.attachEvent("on"+b,c)}function g(a){if(typeof window.onload!="function")window.onload=a;else{var b=window.onload;window.onload=function(){b();a()}}}function h(){var a={};for(type in{Top:"",Left:""}){var b=type=="Top"?"Y":"X";if(typeof window["page"+b+"Offset"]!="undefined")a[type.toLowerCase()]=window["page"+b+"Offset"];else{b=document.documentElement.clientHeight?document.documentElement:document.body; a[type.toLowerCase()]=b["scroll"+type]}}return a}function l(){var a=document.body,b;if(window.innerHeight)b=window.innerHeight;else if(a.parentElement.clientHeight)b=a.parentElement.clientHeight;else if(a&&a.clientHeight)b=a.clientHeight;return b}function i(a){this.parent=document.body;this.createEl(this.parent,a);this.size=Math.random()*5+5;this.el.style.width=Math.round(this.size)+"px";this.el.style.height=Math.round(this.size)+"px";this.maxLeft=document.body.offsetWidth-this.size;this.maxTop=document.body.offsetHeight- this.size;this.left=Math.random()*this.maxLeft;this.top=h().top+1;this.angle=1.4+0.2*Math.random();this.minAngle=1.4;this.maxAngle=1.6;this.angleDelta=0.01*Math.random();this.speed=2+Math.random()}var j=false;g(function(){j=true});var f=true;window.createSnow=function(a,b){if(j){var c=[],m=setInterval(function(){f&&b>c.length&&Math.random()<b*0.0025&&c.push(new i(a));!f&&!c.length&&clearInterval(m);for(var e=h().top,n=l(),d=c.length-1;d>=0;d--)if(c[d])if(c[d].top<e||c[d].top+c[d].size+1>e+n){c[d].remove(); c[d]=null;c.splice(d,1)}else{c[d].move();c[d].draw()}},40);k(window,"scroll",function(){for(var e=c.length-1;e>=0;e--)c[e].draw()})}else g(function(){createSnow(a,b)})};window.removeSnow=function(){f=false};i.prototype={createEl:function(a,b){this.el=document.createElement("img");this.el.setAttribute("src",b+"snow"+Math.floor(Math.random()*4)+".gif");this.el.style.position="absolute";this.el.style.display="block";this.el.style.zIndex="99999";this.parent.appendChild(this.el)},move:function(){if(this.angle< this.minAngle||this.angle>this.maxAngle)this.angleDelta=-this.angleDelta;this.angle+=this.angleDelta;this.left+=this.speed*Math.cos(this.angle*Math.PI);this.top-=this.speed*Math.sin(this.angle*Math.PI);if(this.left<0)this.left=this.maxLeft;else if(this.left>this.maxLeft)this.left=0},draw:function(){this.el.style.top=Math.round(this.top)+"px";this.el.style.left=Math.round(this.left)+"px"},remove:function(){this.parent.removeChild(this.el);this.parent=this.el=null}}})();

Finally, you've just created a snow effect than you can use for your projects or system. For more questions and inquiries, feel free to comment below or email me at [email protected]

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. After downloading it, you will need a program like Winzip to decompress it.

Virus note: All files are scanned once-a-day by SourceCodester.com for viruses, but new viruses come out every day, so no prevention program can catch 100% of them.

FOR YOUR OWN SAFETY, PLEASE:

1. Re-scan downloaded files using your personal virus checker before using it.
2. NEVER, EVER run compiled files (.exe's, .ocx's, .dll's etc.)--only run source code.

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