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/* Snowfall jquery plugin
====================================================================
LICENSE
====================================================================
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
====================================================================
Version 1.51 Dec 2nd 2012
// fixed bug where snow collection didn't happen if a valid doctype was declared.
Version 1.5 Oct 5th 2011
Added collecting snow! Uses the canvas element to collect snow. In order to initialize snow collection use the following
$(document).snowfall({collection : 'element'});
element = any valid jquery selector.
The plugin then creates a canvas above every element that matches the selector, and collects the snow. If there are a varrying amount of elements the
flakes get assigned a random one on start they will collide.
Version 1.4 Dec 8th 2010
Fixed issues (I hope) with scroll bars flickering due to snow going over the edge of the screen.
Added round snowflakes via css, will not work for any version of IE. - Thanks to Luke Barker of http://www.infinite-eye.com/
Added shadows as an option via css again will not work with IE. The idea behind shadows, is to show flakes on lighter colored web sites - Thanks Yutt
Version 1.3.1 Nov 25th 2010
Updated script that caused flakes not to show at all if plugin was initialized with no options, also added the fixes that Han Bongers suggested
Developed by Jason Brown for any bugs or questions email me at loktar69@hotmail
info on the plugin is located on Somethinghitme.com
values for snow options are
flakeCount,
flakeColor,
flakeIndex,
minSize,
maxSize,
minSpeed,
maxSpeed,
round, true or false, makes the snowflakes rounded if the browser supports it.
shadow true or false, gives the snowflakes a shadow if the browser supports it.
Example Usage :
$(document).snowfall({flakeCount : 100, maxSpeed : 10});
-or-
$('#element').snowfall({flakeCount : 800, maxSpeed : 5, maxSize : 5});
-or with defaults-
$(document).snowfall();
- To clear -
$('#element').snowfall('clear');
*/
// requestAnimationFrame polyfill from https://github.com/darius/requestAnimationFrame
if (!Date.now)
Date.now = function() { return new Date().getTime(); };
(function() {
'use strict';
var vendors = ['webkit', 'moz'];
for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
var vp = vendors[i];
window.requestAnimationFrame = window[vp+'RequestAnimationFrame'];
window.cancelAnimationFrame = (window[vp+'CancelAnimationFrame']
|| window[vp+'CancelRequestAnimationFrame']);
}
if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy
|| !window.requestAnimationFrame || !window.cancelAnimationFrame) {
var lastTime = 0;
window.requestAnimationFrame = function(callback) {
var now = Date.now();
var nextTime = Math.max(lastTime + 16, now);
return setTimeout(function() { callback(lastTime = nextTime); },
nextTime - now);
};
window.cancelAnimationFrame = clearTimeout;
}
}());
(function($){
$.snowfall = function(element, options){
var flakes = [],
defaults = {
flakeCount : 35,
flakeColor : '#ffffff',
flakePosition: 'absolute',
flakeIndex: 999999,
minSize : 1,
maxSize : 2,
minSpeed : 1,
maxSpeed : 5,
round : false,
shadow : false,
collection : false,
collectionHeight : 40,
deviceorientation : false
},
options = $.extend(defaults, options),
random = function random(min, max){
return Math.round(min + Math.random()*(max-min));
};
$(element).data("snowfall", this);
// Snow flake object
function Flake(_x, _y, _size, _speed){
// Flake properties
this.x = _x;
this.y = _y;
this.size = _size;
this.speed = _speed;
this.step = 0;
this.stepSize = random(1,10) / 100;
if(options.collection){
this.target = canvasCollection[random(0,canvasCollection.length-1)];
}
var flakeMarkup = null;
if(options.image){
flakeMarkup = document.createElement("img");
flakeMarkup.src = options.image;
}else{
flakeMarkup = document.createElement("div");
$(flakeMarkup).css({'background' : options.flakeColor});
}
$(flakeMarkup).attr({
'class': 'snowfall-flakes',
}).css({
'width' : this.size,
'height' : this.size,
'position' : options.flakePosition,
'top' : this.y,
'left' : this.x,
'fontSize' : 0,
'zIndex' : options.flakeIndex
});
if($(element).get(0).tagName === $(document).get(0).tagName){
$('body').append($(flakeMarkup));
element = $('body');
}else{
$(element).append($(flakeMarkup));
}
this.element = flakeMarkup;
// Update function, used to update the snow flakes, and checks current snowflake against bounds
this.update = function(){
this.y += this.speed;
if(this.y > (elHeight) - (this.size + 6)){
this.reset();
}
this.element.style.top = this.y + 'px';
this.element.style.left = this.x + 'px';
this.step += this.stepSize;
if (doRatio === false) {
this.x += Math.cos(this.step);
} else {
this.x += (doRatio + Math.cos(this.step));
}
// Pileup check
if(options.collection){
if(this.x > this.target.x && this.x < this.target.width + this.target.x && this.y > this.target.y && this.y < this.target.height + this.target.y){
var ctx = this.target.element.getContext("2d"),
curX = this.x - this.target.x,
curY = this.y - this.target.y,
colData = this.target.colData;
if(colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] !== undefined || curY+this.speed+this.size > this.target.height){
if(curY+this.speed+this.size > this.target.height){
while(curY+this.speed+this.size > this.target.height && this.speed > 0){
this.speed *= .5;
}
ctx.fillStyle = defaults.flakeColor;
if(colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] == undefined){
colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] = 1;
ctx.fillRect(curX, (curY)+this.speed+this.size, this.size, this.size);
}else{
colData[parseInt(curX)][parseInt(curY+this.speed)] = 1;
ctx.fillRect(curX, curY+this.speed, this.size, this.size);
}
this.reset();
}else{
// flow to the sides
this.speed = 1;
this.stepSize = 0;
if(parseInt(curX)+1 < this.target.width && colData[parseInt(curX)+1][parseInt(curY)+1] == undefined ){
// go left
this.x++;
}else if(parseInt(curX)-1 > 0 && colData[parseInt(curX)-1][parseInt(curY)+1] == undefined ){
// go right
this.x--;
}else{
//stop
ctx.fillStyle = defaults.flakeColor;
ctx.fillRect(curX, curY, this.size, this.size);
colData[parseInt(curX)][parseInt(curY)] = 1;
this.reset();
}
}
}
}
}
if(this.x + this.size > (elWidth) - widthOffset || this.x < widthOffset){
this.reset();
}
}
// Resets the snowflake once it reaches one of the bounds set
this.reset = function(){
this.y = 0;
this.x = random(widthOffset, elWidth - widthOffset);
this.stepSize = random(1,10) / 100;
this.size = random((options.minSize * 100), (options.maxSize * 100)) / 100;
this.element.style.width = this.size + 'px';
this.element.style.height = this.size + 'px';
this.speed = random(options.minSpeed, options.maxSpeed);
}
}
// local vars
var i = 0,
elHeight = $(element).height(),
elWidth = $(element).width(),
widthOffset = 0,
snowTimeout = 0;
// Collection Piece ******************************
if(options.collection !== false){
var testElem = document.createElement('canvas');
if(!!(testElem.getContext && testElem.getContext('2d'))){
var canvasCollection = [],
elements = $(options.collection),
collectionHeight = options.collectionHeight;
for(var i =0; i < elements.length; i++){
var bounds = elements[i].getBoundingClientRect(),
$canvas = $('<canvas/>',
{
'class' : 'snowfall-canvas'
}),
collisionData = [];
if(bounds.top-collectionHeight > 0){
$('body').append($canvas);
$canvas.css({
'position' : options.flakePosition,
'left' : bounds.left + 'px',
'top' : bounds.top-collectionHeight + 'px'
})
.prop({
width: bounds.width,
height: collectionHeight
});
for(var w = 0; w < bounds.width; w++){
collisionData[w] = [];
}
canvasCollection.push({
element : $canvas.get(0),
x : bounds.left,
y : bounds.top-collectionHeight,
width : bounds.width,
height: collectionHeight,
colData : collisionData
});
}
}
}else{
// Canvas element isnt supported
options.collection = false;
}
}
// ************************************************
// This will reduce the horizontal scroll bar from displaying, when the effect is applied to the whole page
if($(element).get(0).tagName === $(document).get(0).tagName){
widthOffset = 25;
}
// Bind the window resize event so we can get the innerHeight again
$(window).bind("resize", function(){
elHeight = $(element)[0].clientHeight;
elWidth = $(element)[0].offsetWidth;
});
// initialize the flakes
for(i = 0; i < options.flakeCount; i+=1){
flakes.push(new Flake(random(widthOffset,elWidth - widthOffset), random(0, elHeight), random((options.minSize * 100), (options.maxSize * 100)) / 100, random(options.minSpeed, options.maxSpeed)));
}
// This adds the style to make the snowflakes round via border radius property
if(options.round){
$('.snowfall-flakes').css({'-moz-border-radius' : options.maxSize, '-webkit-border-radius' : options.maxSize, 'border-radius' : options.maxSize});
}
// This adds shadows just below the snowflake so they pop a bit on lighter colored web pages
if(options.shadow){
$('.snowfall-flakes').css({'-moz-box-shadow' : '1px 1px 1px #555', '-webkit-box-shadow' : '1px 1px 1px #555', 'box-shadow' : '1px 1px 1px #555'});
}
// On newer Macbooks Snowflakes will fall based on deviceorientation
var doRatio = false;
if (options.deviceorientation) {
$(window).bind('deviceorientation', function(event) {
doRatio = event.originalEvent.gamma * 0.1;
});
}
// this controls flow of the updating snow
function snow(){
for( i = 0; i < flakes.length; i += 1){
flakes[i].update();
}
snowTimeout = requestAnimationFrame(function(){snow()});
}
snow();
// clears the snowflakes
this.clear = function(){
$('.snowfall-canvas').remove();
$(element).children('.snowfall-flakes').remove();
cancelAnimationFrame(snowTimeout);
}
};
// Initialize the options and the plugin
$.fn.snowfall = function(options){
if(typeof(options) == "object" || options == undefined){
return this.each(function(i){
(new $.snowfall(this, options));
});
}else if (typeof(options) == "string") {
return this.each(function(i){
var snow = $(this).data('snowfall');
if(snow){
snow.clear();
}
});
}
};
})(jQuery);
$(document).ready(function() {
$(document).snowfall({flakeCount : 150, maxSpeed : 7, maxSize : 3, shadow:true});
});