mirror of
https://github.com/kennethreitz-archive/wp-snowstorm.git
synced 2026-06-05 23:50:18 +00:00
Kenneth Reitz
506 lines
16 KiB
PHP
506 lines
16 KiB
PHP
<?php
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/*
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Plugin Name: Snowstorm for Wordpress!
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Description: 'Tis the Season!
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Version: 0.1
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Author: Kenneth Reitz
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Plugin URI: http://kennethreitz.com
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Author URI: http://kennethreitz.com
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Dude, it's snowing!
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*/
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function add_snowstorm() {
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echo "<script type=\"text/javascript\" charset=\"utf-8\">";
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echo snowstormjs();
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echo "</script>";
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}
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function snowstormjs()
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{ ?>
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var snowStorm = null;
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function SnowStorm() {
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// --- PROPERTIES ---
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this.flakesMax = 128; // Limit total amount of snow made (falling + sticking)
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this.flakesMaxActive = 64; // Limit amount of snow falling at once (less = lower CPU use)
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this.animationInterval = 33; // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower
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this.flakeBottom = null; // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect
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this.targetElement = null; // element which snow will be appended to (document body if null/undefined) - can be an element ID string, or a DOM node reference
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this.followMouse = true; // Snow will change movement with the user's mouse
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this.snowColor = '#fff'; // Don't eat (or use?) yellow snow.
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this.snowCharacter = '•'; // • = bullet, · is square on some systems etc.
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this.snowStick = true; // Whether or not snow should "stick" at the bottom. When off, will never collect.
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this.useMeltEffect = true; // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it
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this.useTwinkleEffect = false; // Allow snow to randomly "flicker" in and out of view while falling
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this.usePositionFixed = false; // true = snow not affected by window scroll. may increase CPU load, disabled by default - if enabled, used only where supported
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// --- less-used bits ---
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this.flakeLeftOffset = 0; // amount to subtract from edges of container
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this.flakeRightOffset = 0; // amount to subtract from edges of container
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this.flakeWidth = 8; // max pixel width for snow element
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this.flakeHeight = 8; // max pixel height for snow element
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this.vMaxX = 5; // Maximum X velocity range for snow
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this.vMaxY = 4; // Maximum Y velocity range
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this.zIndex = 0; // CSS stacking order applied to each snowflake
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// --- End of user section ---
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// jslint global declarations
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/*global window, document, navigator, clearInterval, setInterval */
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var addEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
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return o.addEventListener(evtName,evtHandler,false);
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}:function(o,evtName,evtHandler) {
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return o.attachEvent('on'+evtName,evtHandler);
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});
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var removeEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
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return o.removeEventListener(evtName,evtHandler,false);
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}:function(o,evtName,evtHandler) {
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return o.detachEvent('on'+evtName,evtHandler);
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});
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function rnd(n,min) {
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if (isNaN(min)) {
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min = 0;
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}
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return (Math.random()*n)+min;
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}
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function plusMinus(n) {
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return (parseInt(rnd(2),10)==1?n*-1:n);
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}
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var s = this;
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var storm = this;
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this.timers = [];
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this.flakes = [];
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this.disabled = false;
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this.active = false;
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var isIE = navigator.userAgent.match(/msie/i);
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var isIE6 = navigator.userAgent.match(/msie 6/i);
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var isOldIE = (isIE && (isIE6 || navigator.userAgent.match(/msie 5/i)));
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var isWin9X = navigator.appVersion.match(/windows 98/i);
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var isiPhone = navigator.userAgent.match(/iphone/i);
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var isBackCompatIE = (isIE && document.compatMode == 'BackCompat');
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var noFixed = ((isBackCompatIE || isIE6 || isiPhone)?true:false);
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var screenX = null;
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var screenX2 = null;
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var screenY = null;
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var scrollY = null;
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var vRndX = null;
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var vRndY = null;
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var windOffset = 1;
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var windMultiplier = 2;
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var flakeTypes = 6;
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var fixedForEverything = false;
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var opacitySupported = (function(){
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try {
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document.createElement('div').style.opacity = '0.5';
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} catch (e) {
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return false;
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}
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return true;
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})();
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var docFrag = document.createDocumentFragment();
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if (s.flakeLeftOffset === null) {
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s.flakeLeftOffset = 0;
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}
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if (s.flakeRightOffset === null) {
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s.flakeRightOffset = 0;
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}
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this.meltFrameCount = 20;
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this.meltFrames = [];
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for (var i=0; i<this.meltFrameCount; i++) {
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this.meltFrames.push(1-(i/this.meltFrameCount));
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}
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this.randomizeWind = function() {
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vRndX = plusMinus(rnd(s.vMaxX,0.2));
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vRndY = rnd(s.vMaxY,0.2);
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if (this.flakes) {
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for (var i=0; i<this.flakes.length; i++) {
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if (this.flakes[i].active) {
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this.flakes[i].setVelocities();
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}
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}
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}
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};
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this.scrollHandler = function() {
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// "attach" snowflakes to bottom of window if no absolute bottom value was given
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scrollY = (s.flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop,10));
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if (isNaN(scrollY)) {
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scrollY = 0; // Netscape 6 scroll fix
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}
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if (!fixedForEverything && !s.flakeBottom && s.flakes) {
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for (var i=s.flakes.length; i--;) {
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if (s.flakes[i].active === 0) {
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s.flakes[i].stick();
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}
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}
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}
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};
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this.resizeHandler = function() {
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if (window.innerWidth || window.innerHeight) {
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screenX = window.innerWidth-(!isIE?16:2)-s.flakeRightOffset;
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screenY = (s.flakeBottom?s.flakeBottom:window.innerHeight);
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} else {
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screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-s.flakeRightOffset;
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screenY = s.flakeBottom?s.flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
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}
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screenX2 = parseInt(screenX/2,10);
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};
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this.resizeHandlerAlt = function() {
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screenX = s.targetElement.offsetLeft+s.targetElement.offsetWidth-s.flakeRightOffset;
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screenY = s.flakeBottom?s.flakeBottom:s.targetElement.offsetTop+s.targetElement.offsetHeight;
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screenX2 = parseInt(screenX/2,10);
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};
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this.freeze = function() {
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// pause animation
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if (!s.disabled) {
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s.disabled = 1;
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} else {
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return false;
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}
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for (var i=s.timers.length; i--;) {
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clearInterval(s.timers[i]);
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}
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};
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this.resume = function() {
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if (s.disabled) {
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s.disabled = 0;
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} else {
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return false;
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}
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s.timerInit();
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};
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this.toggleSnow = function() {
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if (!s.flakes.length) {
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// first run
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s.start();
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} else {
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s.active = !s.active;
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if (s.active) {
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s.show();
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s.resume();
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} else {
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s.stop();
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s.freeze();
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}
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}
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};
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this.stop = function() {
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this.freeze();
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for (var i=this.flakes.length; i--;) {
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this.flakes[i].o.style.display = 'none';
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}
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removeEvent(window,'scroll',s.scrollHandler);
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removeEvent(window,'resize',s.resizeHandler);
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if (!isOldIE) {
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removeEvent(window,'blur',s.freeze);
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removeEvent(window,'focus',s.resume);
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}
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};
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this.show = function() {
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for (var i=this.flakes.length; i--;) {
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this.flakes[i].o.style.display = 'block';
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}
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};
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this.SnowFlake = function(parent,type,x,y) {
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var s = this;
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var storm = parent;
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this.type = type;
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this.x = x||parseInt(rnd(screenX-20),10);
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this.y = (!isNaN(y)?y:-rnd(screenY)-12);
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this.vX = null;
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this.vY = null;
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this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
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this.vAmp = this.vAmpTypes[this.type];
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this.melting = false;
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this.meltFrameCount = storm.meltFrameCount;
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this.meltFrames = storm.meltFrames;
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this.meltFrame = 0;
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this.twinkleFrame = 0;
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this.active = 1;
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this.fontSize = (10+(this.type/5)*10);
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this.o = document.createElement('div');
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this.o.innerHTML = storm.snowCharacter;
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this.o.style.color = storm.snowColor;
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this.o.style.position = (fixedForEverything?'fixed':'absolute');
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this.o.style.width = storm.flakeWidth+'px';
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this.o.style.height = storm.flakeHeight+'px';
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this.o.style.fontFamily = 'arial,verdana';
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this.o.style.overflow = 'hidden';
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this.o.style.fontWeight = 'normal';
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this.o.style.zIndex = storm.zIndex;
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docFrag.appendChild(this.o);
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this.refresh = function() {
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if (isNaN(s.x) || isNaN(s.y)) {
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// safety check
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return false;
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}
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s.o.style.left = s.x+'px';
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s.o.style.top = s.y+'px';
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};
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this.stick = function() {
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if (noFixed || (storm.targetElement != document.documentElement && storm.targetElement != document.body)) {
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s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px';
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} else if (storm.flakeBottom) {
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s.o.style.top = storm.flakeBottom+'px';
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} else {
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s.o.style.display = 'none';
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s.o.style.top = 'auto';
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s.o.style.bottom = '0px';
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s.o.style.position = 'fixed';
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s.o.style.display = 'block';
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}
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};
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this.vCheck = function() {
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if (s.vX>=0 && s.vX<0.2) {
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s.vX = 0.2;
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} else if (s.vX<0 && s.vX>-0.2) {
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s.vX = -0.2;
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}
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if (s.vY>=0 && s.vY<0.2) {
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s.vY = 0.2;
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}
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};
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this.move = function() {
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var vX = s.vX*windOffset;
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s.x += vX;
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s.y += (s.vY*s.vAmp);
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if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
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s.x = 0;
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} else if (vX < 0 && s.x-storm.flakeLeftOffset<0-storm.flakeWidth) {
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s.x = screenX-storm.flakeWidth-1; // flakeWidth;
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}
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s.refresh();
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var yDiff = screenY+scrollY-s.y;
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if (yDiff<storm.flakeHeight) {
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s.active = 0;
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if (storm.snowStick) {
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s.stick();
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} else {
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s.recycle();
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}
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} else {
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if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) {
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// ~1/1000 chance of melting mid-air, with each frame
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s.melting = true;
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s.melt();
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// only incrementally melt one frame
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// s.melting = false;
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}
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if (storm.useTwinkleEffect) {
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if (!s.twinkleFrame) {
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if (Math.random()>0.9) {
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s.twinkleFrame = parseInt(Math.random()*20,10);
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}
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} else {
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s.twinkleFrame--;
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s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame%2===0?'hidden':'visible');
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}
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}
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}
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};
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this.animate = function() {
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// main animation loop
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// move, check status, die etc.
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s.move();
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};
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this.setVelocities = function() {
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s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1);
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s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1);
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};
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this.setOpacity = function(o,opacity) {
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if (!opacitySupported) {
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return false;
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}
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o.style.opacity = opacity;
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};
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this.melt = function() {
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if (!storm.useMeltEffect || !s.melting) {
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s.recycle();
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} else {
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if (s.meltFrame < s.meltFrameCount) {
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s.meltFrame++;
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s.setOpacity(s.o,s.meltFrames[s.meltFrame]);
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s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px';
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s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px';
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} else {
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s.recycle();
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}
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}
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};
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this.recycle = function() {
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s.o.style.display = 'none';
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s.o.style.position = (fixedForEverything?'fixed':'absolute');
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s.o.style.bottom = 'auto';
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s.setVelocities();
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s.vCheck();
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s.meltFrame = 0;
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s.melting = false;
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s.setOpacity(s.o,1);
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s.o.style.padding = '0px';
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s.o.style.margin = '0px';
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s.o.style.fontSize = s.fontSize+'px';
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s.o.style.lineHeight = (storm.flakeHeight+2)+'px';
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s.o.style.textAlign = 'center';
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s.o.style.verticalAlign = 'baseline';
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s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10);
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s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight;
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s.refresh();
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s.o.style.display = 'block';
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s.active = 1;
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};
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this.recycle(); // set up x/y coords etc.
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this.refresh();
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};
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this.snow = function() {
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var active = 0;
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var used = 0;
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var waiting = 0;
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var flake = null;
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for (var i=s.flakes.length; i--;) {
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if (s.flakes[i].active == 1) {
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s.flakes[i].move();
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active++;
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} else if (s.flakes[i].active === 0) {
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used++;
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} else {
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waiting++;
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}
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if (s.flakes[i].melting) {
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s.flakes[i].melt();
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}
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}
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if (active<s.flakesMaxActive) {
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flake = s.flakes[parseInt(rnd(s.flakes.length),10)];
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if (flake.active === 0) {
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flake.melting = true;
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}
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}
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};
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this.mouseMove = function(e) {
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if (!s.followMouse) {
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return true;
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}
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var x = parseInt(e.clientX,10);
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if (x<screenX2) {
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windOffset = -windMultiplier+(x/screenX2*windMultiplier);
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} else {
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x -= screenX2;
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windOffset = (x/screenX2)*windMultiplier;
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}
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};
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this.createSnow = function(limit,allowInactive) {
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for (var i=0; i<limit; i++) {
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s.flakes[s.flakes.length] = new s.SnowFlake(s,parseInt(rnd(flakeTypes),10));
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if (allowInactive || i>s.flakesMaxActive) {
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s.flakes[s.flakes.length-1].active = -1;
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}
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}
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storm.targetElement.appendChild(docFrag);
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};
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this.timerInit = function() {
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s.timers = (!isWin9X?[setInterval(s.snow,s.animationInterval)]:[setInterval(s.snow,s.animationInterval*3),setInterval(s.snow,s.animationInterval)]);
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};
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this.init = function() {
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s.randomizeWind();
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s.createSnow(s.flakesMax); // create initial batch
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addEvent(window,'resize',s.resizeHandler);
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addEvent(window,'scroll',s.scrollHandler);
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if (!isOldIE) {
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addEvent(window,'blur',s.freeze);
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addEvent(window,'focus',s.resume);
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}
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s.resizeHandler();
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s.scrollHandler();
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if (s.followMouse) {
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addEvent(document,'mousemove',s.mouseMove);
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}
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s.animationInterval = Math.max(20,s.animationInterval);
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s.timerInit();
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};
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var didInit = false;
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this.start = function(bFromOnLoad) {
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if (!didInit) {
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didInit = true;
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} else if (bFromOnLoad) {
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// already loaded and running
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return true;
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}
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if (typeof s.targetElement == 'string') {
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var targetID = s.targetElement;
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s.targetElement = document.getElementById(targetID);
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if (!s.targetElement) {
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throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
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}
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}
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if (!s.targetElement) {
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s.targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
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}
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if (s.targetElement != document.documentElement && s.targetElement != document.body) {
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s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
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}
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s.resizeHandler(); // get bounding box elements
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s.usePositionFixed = (s.usePositionFixed && !noFixed); // whether or not position:fixed is supported
|
|
fixedForEverything = s.usePositionFixed;
|
|
if (screenX && screenY && !s.disabled) {
|
|
s.init();
|
|
s.active = true;
|
|
}
|
|
};
|
|
|
|
function doStart() {
|
|
s.start(true);
|
|
}
|
|
|
|
if (document.addEventListener) {
|
|
// safari 3.0.4 doesn't do DOMContentLoaded, maybe others - use a fallback to be safe.
|
|
document.addEventListener('DOMContentLoaded',doStart,false);
|
|
window.addEventListener('load',doStart,false);
|
|
} else {
|
|
addEvent(window,'load',doStart);
|
|
}
|
|
|
|
}
|
|
|
|
snowStorm = new SnowStorm();
|
|
<?php }
|
|
|
|
add_action( 'wp_head', 'add_snowstorm' );
|