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-/** @license
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-========================================================================
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- Snowfall jquery plugin version 1.51 Dec 2nd 2012
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-
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- Licensed under the Apache License, Version 2.0 (the "License");
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- you may not use this file except in compliance with the License.
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- You may obtain a copy of the License at
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-
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- http://www.apache.org/licenses/LICENSE-2.0
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-
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- Unless required by applicable law or agreed to in writing, software
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- distributed under the License is distributed on an "AS IS" BASIS,
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- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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- See the License for the specific language governing permissions and
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- limitations under the License.
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-
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- Developed by Jason Brown for any bugs or questions email me at loktar69@hotmail
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- info on the plugin is located on Somethinghitme.com
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-*/
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-
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-/*
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- Version 1.51 Dec 2nd 2012
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- // fixed bug where snow collection didn't happen if a valid doctype was declared.
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-
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- Version 1.5 Oct 5th 2011
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- Added collecting snow! Uses the canvas element to collect snow. In order to initialize snow collection use the following
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-
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- $(document).snowfall({collection : 'element'});
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-
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- element = any valid jquery selector.
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-
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- 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
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- flakes get assigned a random one on start they will collide.
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-
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- Version 1.4 Dec 8th 2010
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- Fixed issues (I hope) with scroll bars flickering due to snow going over the edge of the screen.
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- Added round snowflakes via css, will not work for any version of IE. - Thanks to Luke Barker of http://www.infinite-eye.com/
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- 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
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-
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- Version 1.3.1 Nov 25th 2010
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- 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
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-
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- Developed by Jason Brown for any bugs or questions email me at loktar69@hotmail
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- info on the plugin is located on Somethinghitme.com
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-
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- values for snow options are
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-
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- flakeCount,
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- flakeColor,
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- flakeIndex,
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- minSize,
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- maxSize,
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- minSpeed,
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- maxSpeed,
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- round, true or false, makes the snowflakes rounded if the browser supports it.
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- shadow true or false, gives the snowflakes a shadow if the browser supports it.
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-
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- Example Usage :
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- $(document).snowfall({flakeCount : 100, maxSpeed : 10});
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-
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- -or-
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-
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- $('#element').snowfall({flakeCount : 800, maxSpeed : 5, maxSize : 5});
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-
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- -or with defaults-
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-
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- $(document).snowfall();
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-
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- - To clear -
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- $('#element').snowfall('clear');
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-*/
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-
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-// requestAnimationFrame polyfill from https://github.com/darius/requestAnimationFrame
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-if (!Date.now)
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- Date.now = function() { return new Date().getTime(); };
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-
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-(function() {
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- 'use strict';
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-
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- var vendors = ['webkit', 'moz'];
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- for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
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- var vp = vendors[i];
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- window.requestAnimationFrame = window[vp+'RequestAnimationFrame'];
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- window.cancelAnimationFrame = (window[vp+'CancelAnimationFrame']
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- || window[vp+'CancelRequestAnimationFrame']);
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- }
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- if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy
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- || !window.requestAnimationFrame || !window.cancelAnimationFrame) {
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- var lastTime = 0;
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- window.requestAnimationFrame = function(callback) {
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- var now = Date.now();
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- var nextTime = Math.max(lastTime + 16, now);
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- return setTimeout(function() { callback(lastTime = nextTime); },
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- nextTime - now);
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- };
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- window.cancelAnimationFrame = clearTimeout;
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- }
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-}());
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-
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-(function($){
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- $.snowfall = function(element, options){
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- var flakes = [],
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- defaults = {
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- flakeCount : 35,
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- flakeColor : '#ffffff',
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- flakePosition: 'absolute',
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- flakeIndex: 999999,
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- minSize : 1,
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- maxSize : 2,
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- minSpeed : 1,
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- maxSpeed : 5,
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- round : false,
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- shadow : false,
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- collection : false,
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- collectionHeight : 40,
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- deviceorientation : false
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- },
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- options = $.extend(defaults, options),
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- random = function random(min, max){
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- return Math.round(min + Math.random()*(max-min));
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- };
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-
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- $(element).data("snowfall", this);
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-
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- // Snow flake object
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- function Flake(_x, _y, _size, _speed){
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- // Flake properties
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- this.x = _x;
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- this.y = _y;
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- this.size = _size;
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- this.speed = _speed;
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- this.step = 0;
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- this.stepSize = random(1,10) / 100;
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-
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- if(options.collection){
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- this.target = canvasCollection[random(0,canvasCollection.length-1)];
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- }
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-
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- var flakeMarkup = null;
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-
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- if(options.image){
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- flakeMarkup = document.createElement("img");
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- flakeMarkup.src = options.image;
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- }else{
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- flakeMarkup = document.createElement("div");
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- $(flakeMarkup).css({'background' : options.flakeColor});
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- }
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-
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- $(flakeMarkup).attr({
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- 'class': 'snowfall-flakes',
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- }).css({
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- 'width' : this.size,
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- 'height' : this.size,
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- 'position' : options.flakePosition,
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- 'top' : this.y,
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- 'left' : this.x,
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- 'fontSize' : 0,
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- 'zIndex' : options.flakeIndex
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- });
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-
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- if($(element).get(0).tagName === $(document).get(0).tagName){
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- $('body').append($(flakeMarkup));
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- element = $('body');
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- }else{
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- $(element).append($(flakeMarkup));
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- }
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-
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- this.element = flakeMarkup;
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-
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- // Update function, used to update the snow flakes, and checks current snowflake against bounds
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- this.update = function(){
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- this.y += this.speed;
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-
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- if(this.y > (elHeight) - (this.size + 6)){
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- this.reset();
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- }
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-
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- this.element.style.top = this.y + 'px';
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- this.element.style.left = this.x + 'px';
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-
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- this.step += this.stepSize;
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-
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- if (doRatio === false) {
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- this.x += Math.cos(this.step);
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- } else {
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- this.x += (doRatio + Math.cos(this.step));
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- }
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-
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- // Pileup check
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- if(options.collection){
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- 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){
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- var ctx = this.target.element.getContext("2d"),
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- curX = this.x - this.target.x,
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- curY = this.y - this.target.y,
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- colData = this.target.colData;
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-
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- if(colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] !== undefined || curY+this.speed+this.size > this.target.height){
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- if(curY+this.speed+this.size > this.target.height){
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- while(curY+this.speed+this.size > this.target.height && this.speed > 0){
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- this.speed *= .5;
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- }
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-
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- ctx.fillStyle = "#fff";
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- ctx.shadowOffsetX = 1;
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- ctx.shadowOffsetY = 1;
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- ctx.shadowColor = "#000";
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- ctx.shadowBlur = 1;
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-
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- if(colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] == undefined){
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- // console.log("1");
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- colData[parseInt(curX)][parseInt(curY+this.speed+this.size)] = 1;
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- //ctx.fillRect(curX, (curY)+this.speed+this.size, this.size, this.size);
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-
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- ctx.beginPath();
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- ctx.arc(curX, curY+this.speed+this.size, this.size / 2, 0, Math.PI * 2, true);
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- ctx.closePath();
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- ctx.fill();
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-
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- }else{
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- // console.log("2");
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- colData[parseInt(curX)][parseInt(curY+this.speed)] = 1;
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- //ctx.fillRect(curX, curY+this.speed, this.size, this.size);
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-
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- // ctx.fillStyle = "#f00";
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- ctx.beginPath();
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- ctx.arc(curX, curY+this.speed+this.size, this.size, 0, Math.PI * 2, true);
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- ctx.closePath();
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- ctx.fill();
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- }
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- this.reset();
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- }else{
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- // flow to the sides
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- this.speed = 1;
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- this.stepSize = 0;
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-
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- // console.log("3");
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-
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- if(parseInt(curX)+1 < this.target.width && colData[parseInt(curX)+1][parseInt(curY)+1] == undefined ){
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- // go left
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- this.x++;
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- }else if(parseInt(curX)-1 > 0 && colData[parseInt(curX)-1][parseInt(curY)+1] == undefined ){
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- // go right
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- this.x--;
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- }else{
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- //stop
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- ctx.fillStyle = "#fff";
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- ctx.shadowOffsetX = -4;
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- ctx.shadowOffsetY = -4;
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- ctx.shadowColor = "#000";
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- ctx.shadowBlur = 4;
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- //ctx.fillRect(curX, curY, this.size, this.size);
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-
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- ctx.beginPath();
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- ctx.arc(curX, curY+this.speed+this.size, this.size, 0, Math.PI * 2, true);
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- ctx.closePath();
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- ctx.fill();
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-
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- colData[parseInt(curX)][parseInt(curY)] = 1;
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- this.reset();
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- }
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- }
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- }
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- }
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- }
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-
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- if(this.x + this.size > (elWidth) - widthOffset || this.x < widthOffset){
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- this.reset();
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- }
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- }
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-
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- // Resets the snowflake once it reaches one of the bounds set
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- this.reset = function(){
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- this.y = 0;
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- this.x = random(widthOffset, elWidth - widthOffset);
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- this.stepSize = random(1,10) / 100;
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- this.size = random((options.minSize * 100), (options.maxSize * 100)) / 100;
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- this.element.style.width = this.size + 'px';
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- this.element.style.height = this.size + 'px';
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- this.speed = random(options.minSpeed, options.maxSpeed);
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- }
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- }
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-
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- // local vars
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- var i = 0,
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- elHeight = $(element).height(),
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- elWidth = $(element).width(),
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- widthOffset = 0,
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- snowTimeout = 0;
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-
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- // Collection Piece ******************************
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- if(options.collection !== false){
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- var testElem = document.createElement('canvas');
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- if(!!(testElem.getContext && testElem.getContext('2d'))){
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- var canvasCollection = [],
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- elements = $(options.collection),
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- collectionHeight = options.collectionHeight;
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-
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- for(var i =0; i < elements.length; i++){
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- var bounds = elements[i].getBoundingClientRect(),
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- $canvas = $('<canvas/>',
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- {
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- 'class' : 'snowfall-canvas'
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- }),
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- collisionData = [];
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-
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- if(bounds.top-collectionHeight > 0){
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- $('body').append($canvas);
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-
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- $canvas.css({
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- 'position' : options.flakePosition,
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- 'left' : bounds.left + 'px',
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- 'top' : bounds.top-collectionHeight + 'px'
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- })
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- .prop({
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- width: bounds.width,
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- height: collectionHeight
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- });
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-
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- for(var w = 0; w < bounds.width; w++){
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- collisionData[w] = [];
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- }
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-
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- canvasCollection.push({
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- element : $canvas.get(0),
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- x : bounds.left,
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- y : bounds.top-collectionHeight,
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- width : bounds.width,
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- height: collectionHeight,
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- colData : collisionData
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- });
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- }
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- }
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- }else{
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- // Canvas element isnt supported
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- options.collection = false;
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- }
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- }
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- // ************************************************
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-
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- // This will reduce the horizontal scroll bar from displaying, when the effect is applied to the whole page
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- if($(element).get(0).tagName === $(document).get(0).tagName){
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- widthOffset = 25;
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- }
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-
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- // Bind the window resize event so we can get the innerHeight again
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- $(window).bind("resize", function(){
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- elHeight = $(element)[0].clientHeight;
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- elWidth = $(element)[0].offsetWidth;
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- });
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-
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-
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- // initialize the flakes
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- for(i = 0; i < options.flakeCount; i+=1){
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- flakes.push(new Flake(random(widthOffset,elWidth - widthOffset), random(0, elHeight), random((options.minSize * 100), (options.maxSize * 100)) / 100, random(options.minSpeed, options.maxSpeed)));
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- }
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-
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- // This adds the style to make the snowflakes round via border radius property
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- if(options.round){
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- $('.snowfall-flakes').css({'-moz-border-radius' : options.maxSize, '-webkit-border-radius' : options.maxSize, 'border-radius' : options.maxSize});
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- }
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-
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- // This adds shadows just below the snowflake so they pop a bit on lighter colored web pages
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- if(options.shadow){
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- $('.snowfall-flakes').css({'-moz-box-shadow' : '1px 1px 1px #555', '-webkit-box-shadow' : '1px 1px 1px #555', 'box-shadow' : '1px 1px 1px #555'});
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- }
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-
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- // On newer Macbooks Snowflakes will fall based on deviceorientation
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- var doRatio = false;
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- if (options.deviceorientation) {
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- $(window).bind('deviceorientation', function(event) {
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- doRatio = event.originalEvent.gamma * 0.1;
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- });
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- }
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-
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- // this controls flow of the updating snow
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- function snow(){
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- for( i = 0; i < flakes.length; i += 1){
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- flakes[i].update();
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- }
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-
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- snowTimeout = requestAnimationFrame(function(){snow()});
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- }
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-
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- snow();
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-
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- // clears the snowflakes
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- this.clear = function(){
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- $('.snowfall-canvas').remove();
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- $(element).children('.snowfall-flakes').remove();
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- cancelAnimationFrame(snowTimeout);
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- }
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- };
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-
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- // Initialize the options and the plugin
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- $.fn.snowfall = function(options){
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- if(typeof(options) == "object" || options == undefined){
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- return this.each(function(i){
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- (new $.snowfall(this, options));
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- });
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- }else if (typeof(options) == "string") {
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- return this.each(function(i){
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- var snow = $(this).data('snowfall');
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- if(snow){
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- snow.clear();
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- }
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- });
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- }
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- };
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-})(jQuery);
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