Created
September 11, 2012 09:56
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Ball Passer
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| var socket = io.connect('http://localhost:8001'), | |
| only = false, | |
| timer_id = null, | |
| Ball = { | |
| img: new Image(), | |
| x: 0, | |
| direction : 1, // default direction - left to right | |
| speed : 3, | |
| width : 60 }, | |
| Canvas = { | |
| width: 500, | |
| height: 300, | |
| el: null, | |
| context2D: null }; | |
| socket.on('start', initDrawing ); | |
| socket.on('update', function (data) { only = data.only; }); | |
| $(document).ready( function() { | |
| Canvas.el = document.getElementById("canvas"); | |
| Canvas.context2D = Canvas.el.getContext('2d'); | |
| Ball.img.src = "http://localhost/ball/ball.png"; | |
| }); | |
| function initDrawing() { | |
| // always start from the left side and move to the right | |
| Ball.x = 0; | |
| Ball.direction = 1; | |
| timer_id = setInterval(draw, 16); | |
| } | |
| function draw() { | |
| Ball.x += Ball.speed * Ball.direction; | |
| Canvas.context2D.clearRect(0, 0, Canvas.width, Canvas.height); | |
| Canvas.context2D.drawImage(Ball.img, Ball.x, 0); | |
| if ( Ball.x < 0 || Ball.x > Canvas.width - Ball.width ) { | |
| borderReached(); | |
| } | |
| } | |
| function borderReached() { | |
| if ( only ) { | |
| // keep ball, reverse direction: | |
| Ball.direction *= -1; | |
| console.log("keep ball"); | |
| } | |
| else { | |
| // pass ball | |
| clearInterval(timer_id); | |
| Canvas.context2D.clearRect(0, 0, Canvas.width, Canvas.height); | |
| socket.emit('ball-ready'); | |
| console.log("ball is ready"); | |
| } | |
| } | |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
| <title></title> | |
| <link href="style.css" rel="stylesheet" type="text/css" /> | |
| <script src="jquery.js" type="text/javascript"></script> | |
| <script src="socket.io-client.js"></script> | |
| <script src="client.js" type="text/javascript"></script> | |
| </head> | |
| <body> | |
| <canvas id = "canvas" height = "300" width = "500"> | |
| Update your browser, dummy! | |
| </canvas> | |
| </body> | |
| </html> |
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| /*! jQuery v1.7.2 jquery.com | jquery.org/license */ | |
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a=this[0],b=this.offsetParent(),c=this.offset(),d=cx.test(b[0].nodeName)?{top:0,left:0}:b.offset();c.top-=parseFloat(f.css(a,"marginTop"))||0,c.left-=parseFloat(f.css(a,"marginLeft"))||0,d.top+=parseFloat(f.css(b[0],"borderTopWidth"))||0,d.left+=parseFloat(f.css(b[0],"borderLeftWidth"))||0;return{top:c.top-d.top,left:c.left-d.left}},offsetParent:function(){return this.map(function(){var a=this.offsetParent||c.body;while(a&&!cx.test(a.nodeName)&&f.css(a,"position")==="static")a=a.offsetParent;return a})}}),f.each({scrollLeft:"pageXOffset",scrollTop:"pageYOffset"},function(a,c){var d=/Y/.test(c);f.fn[a]=function(e){return f.access(this,function(a,e,g){var h=cy(a);if(g===b)return h?c in h?h[c]:f.support.boxModel&&h.document.documentElement[e]||h.document.body[e]:a[e];h?h.scrollTo(d?f(h).scrollLeft():g,d?g:f(h).scrollTop()):a[e]=g},a,e,arguments.length,null)}}),f.each({Height:"height",Width:"width"},function(a,c){var d="client"+a,e="scroll"+a,g="offset"+a;f.fn["inner"+a]=function(){var a=this[0];return a?a.style?parseFloat(f.css(a,c,"padding")):this[c]():null},f.fn["outer"+a]=function(a){var b=this[0];return b?b.style?parseFloat(f.css(b,c,a?"margin":"border")):this[c]():null},f.fn[c]=function(a){return f.access(this,function(a,c,h){var i,j,k,l;if(f.isWindow(a)){i=a.document,j=i.documentElement[d];return f.support.boxModel&&j||i.body&&i.body[d]||j}if(a.nodeType===9){i=a.documentElement;if(i[d]>=i[e])return i[d];return Math.max(a.body[e],i[e],a.body[g],i[g])}if(h===b){k=f.css(a,c),l=parseFloat(k);return f.isNumeric(l)?l:k}f(a).css(c,h)},c,a,arguments.length,null)}}),a.jQuery=a.$=f,typeof define=="function"&&define.amd&&define.amd.jQuery&&define("jquery",[],function(){return f})})(window); |
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| var io = require('socket.io').listen(8001), | |
| queue = [], | |
| // no connected clients when server starts | |
| socket_with_ball = -1; | |
| io.sockets.on('connection', function (socket) { | |
| console.log('client connected!'); | |
| // add to queue | |
| queue.push(socket); | |
| socket.queue_id = queue.length - 1; | |
| checkIfOnlyAndEmit(socket); | |
| socket.on('ball-ready', passToNextSocket ); | |
| socket.on('disconnect', handleDisconnection ); | |
| }); | |
| function checkIfOnlyAndEmit(socket) { | |
| var conn = queue.length; | |
| if ( conn === 1 ) { | |
| socket.emit('start'); | |
| socket.emit('update', { 'only': true } ); | |
| socket_with_ball = 0; | |
| }else if ( conn === 2 ) { | |
| queue[0].emit('update', { 'only': false }); | |
| } | |
| } | |
| function passToNextSocket() { | |
| socket_with_ball += 1; | |
| socket_with_ball %= queue.length; | |
| // are there connected clients? | |
| if ( queue.length !== 0 ) { | |
| io.sockets.socket( queue[ socket_with_ball ].id ).emit('start'); | |
| }else { | |
| throw new Error("There is no 'next socket' to pass the ball to."); | |
| } | |
| } | |
| function handleDisconnection() { | |
| var i = this.queue_id, | |
| conn = queue.length - 1; // number of connections AFTER the disconnection | |
| console.log('client disconnected!', i); | |
| // remove from queue | |
| queue.splice(i,1); | |
| // decrease the queue_ids of all the following sockets in queue | |
| for ( ; i < conn; i++ ) { queue[i].queue_id = i; } | |
| // pass the ball or inform the only socket to keep it. | |
| if ( conn === 0 ) { | |
| console.log("ball not passed! No more sockets!") | |
| socket_with_ball = -1; | |
| }else if ( conn === 1 ) { | |
| if ( this.queue_id === socket_with_ball ) { | |
| queue[0].emit("start"); | |
| } | |
| queue[0].emit('update', { 'only': true }); | |
| socket_with_ball = 0; | |
| }else { | |
| if ( this.queue_id === socket_with_ball ) { | |
| passToNextSocket(); | |
| } | |
| } | |
| } |
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| /*! Socket.IO.min.js build:0.9.10, production. Copyright(c) 2011 LearnBoost <dev@learnboost.com> MIT Licensed */ | |
| var io="undefined"==typeof module?{}:module.exports;(function(){(function(a,b){var c=a;c.version="0.9.10",c.protocol=1,c.transports=[],c.j=[],c.sockets={},c.connect=function(a,d){var e=c.util.parseUri(a),f,g;b&&b.location&&(e.protocol=e.protocol||b.location.protocol.slice(0,-1),e.host=e.host||(b.document?b.document.domain:b.location.hostname),e.port=e.port||b.location.port),f=c.util.uniqueUri(e);var h={host:e.host,secure:"https"==e.protocol,port:e.port||("https"==e.protocol?443:80),query:e.query||""};c.util.merge(h,d);if(h["force new connection"]||!c.sockets[f])g=new c.Socket(h);return!h["force new connection"]&&g&&(c.sockets[f]=g),g=g||c.sockets[f],g.of(e.path.length>1?e.path:"")}})("object"==typeof module?module.exports:this.io={},this),function(a,b){var c=a.util={},d=/^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/,e=["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"];c.parseUri=function(a){var b=d.exec(a||""),c={},f=14;while(f--)c[e[f]]=b[f]||"";return c},c.uniqueUri=function(a){var c=a.protocol,d=a.host,e=a.port;return"document"in b?(d=d||document.domain,e=e||(c=="https"&&document.location.protocol!=="https:"?443:document.location.port)):(d=d||"localhost",!e&&c=="https"&&(e=443)),(c||"http")+"://"+d+":"+(e||80)},c.query=function(a,b){var d=c.chunkQuery(a||""),e=[];c.merge(d,c.chunkQuery(b||""));for(var f in d)d.hasOwnProperty(f)&&e.push(f+"="+d[f]);return e.length?"?"+e.join("&"):""},c.chunkQuery=function(a){var b={},c=a.split("&"),d=0,e=c.length,f;for(;d<e;++d)f=c[d].split("="),f[0]&&(b[f[0]]=f[1]);return b};var f=!1;c.load=function(a){if("document"in b&&document.readyState==="complete"||f)return a();c.on(b,"load",a,!1)},c.on=function(a,b,c,d){a.attachEvent?a.attachEvent("on"+b,c):a.addEventListener&&a.addEventListener(b,c,d)},c.request=function(a){if(a&&"undefined"!=typeof XDomainRequest)return new XDomainRequest;if("undefined"!=typeof XMLHttpRequest&&(!a||c.ua.hasCORS))return new XMLHttpRequest;if(!a)try{return new(window[["Active"].concat("Object").join("X")])("Microsoft.XMLHTTP")}catch(b){}return null},"undefined"!=typeof window&&c.load(function(){f=!0}),c.defer=function(a){if(!c.ua.webkit||"undefined"!=typeof importScripts)return a();c.load(function(){setTimeout(a,100)})},c.merge=function(b,d,e,f){var g=f||[],h=typeof e=="undefined"?2:e,i;for(i in d)d.hasOwnProperty(i)&&c.indexOf(g,i)<0&&(typeof b[i]!="object"||!h?(b[i]=d[i],g.push(d[i])):c.merge(b[i],d[i],h-1,g));return b},c.mixin=function(a,b){c.merge(a.prototype,b.prototype)},c.inherit=function(a,b){function c(){}c.prototype=b.prototype,a.prototype=new c},c.isArray=Array.isArray||function(a){return Object.prototype.toString.call(a)==="[object Array]"},c.intersect=function(a,b){var d=[],e=a.length>b.length?a:b,f=a.length>b.length?b:a;for(var g=0,h=f.length;g<h;g++)~c.indexOf(e,f[g])&&d.push(f[g]);return d},c.indexOf=function(a,b,c){for(var d=a.length,c=c<0?c+d<0?0:c+d:c||0;c<d&&a[c]!==b;c++);return d<=c?-1:c},c.toArray=function(a){var b=[];for(var c=0,d=a.length;c<d;c++)b.push(a[c]);return b},c.ua={},c.ua.hasCORS="undefined"!=typeof XMLHttpRequest&&function(){try{var a=new XMLHttpRequest}catch(b){return!1}return a.withCredentials!=undefined}(),c.ua.webkit="undefined"!=typeof navigator&&/webkit/i.test(navigator.userAgent),c.ua.iDevice="undefined"!=typeof navigator&&/iPad|iPhone|iPod/i.test(navigator.userAgent)}("undefined"!=typeof io?io:module.exports,this),function(a,b){function c(){}a.EventEmitter=c,c.prototype.on=function(a,c){return this.$events||(this.$events={}),this.$events[a]?b.util.isArray(this.$events[a])?this.$events[a].push(c):this.$events[a]=[this.$events[a],c]:this.$events[a]=c,this},c.prototype.addListener=c.prototype.on,c.prototype.once=function(a,b){function d(){c.removeListener(a,d),b.apply(this,arguments)}var c=this;return d.listener=b,this.on(a,d),this},c.prototype.removeListener=function(a,c){if(this.$events&&this.$events[a]){var d=this.$events[a];if(b.util.isArray(d)){var e=-1;for(var f=0,g=d.length;f<g;f++)if(d[f]===c||d[f].listener&&d[f].listener===c){e=f;break}if(e<0)return this;d.splice(e,1),d.length||delete this.$events[a]}else(d===c||d.listener&&d.listener===c)&&delete this.$events[a]}return this},c.prototype.removeAllListeners=function(a){return a===undefined?(this.$events={},this):(this.$events&&this.$events[a]&&(this.$events[a]=null),this)},c.prototype.listeners=function(a){return this.$events||(this.$events={}),this.$events[a]||(this.$events[a]=[]),b.util.isArray(this.$events[a])||(this.$events[a]=[this.$events[a]]),this.$events[a]},c.prototype.emit=function(a){if(!this.$events)return!1;var c=this.$events[a];if(!c)return!1;var d=Array.prototype.slice.call(arguments,1);if("function"==typeof c)c.apply(this,d);else{if(!b.util.isArray(c))return!1;var e=c.slice();for(var f=0,g=e.length;f<g;f++)e[f].apply(this,d)}return!0}}("undefined"!=typeof io?io:module.exports,"undefined"!=typeof io?io:module.parent.exports),function(exports,nativeJSON){function f(a){return a<10?"0"+a:a}function date(a,b){return isFinite(a.valueOf())?a.getUTCFullYear()+"-"+f(a.getUTCMonth()+1)+"-"+f(a.getUTCDate())+"T"+f(a.getUTCHours())+":"+f(a.getUTCMinutes())+":"+f(a.getUTCSeconds())+"Z":null}function quote(a){return escapable.lastIndex=0,escapable.test(a)?'"'+a.replace(escapable,function(a){var b=meta[a];return typeof b=="string"?b:"\\u"+("0000"+a.charCodeAt(0).toString(16)).slice(-4)})+'"':'"'+a+'"'}function str(a,b){var c,d,e,f,g=gap,h,i=b[a];i instanceof Date&&(i=date(a)),typeof rep=="function"&&(i=rep.call(b,a,i));switch(typeof i){case"string":return quote(i);case"number":return isFinite(i)?String(i):"null";case"boolean":case"null":return String(i);case"object":if(!i)return"null";gap+=indent,h=[];if(Object.prototype.toString.apply(i)==="[object Array]"){f=i.length;for(c=0;c<f;c+=1)h[c]=str(c,i)||"null";return e=h.length===0?"[]":gap?"[\n"+gap+h.join(",\n"+gap)+"\n"+g+"]":"["+h.join(",")+"]",gap=g,e}if(rep&&typeof rep=="object"){f=rep.length;for(c=0;c<f;c+=1)typeof rep[c]=="string"&&(d=rep[c],e=str(d,i),e&&h.push(quote(d)+(gap?": ":":")+e))}else for(d in i)Object.prototype.hasOwnProperty.call(i,d)&&(e=str(d,i),e&&h.push(quote(d)+(gap?": ":":")+e));return e=h.length===0?"{}":gap?"{\n"+gap+h.join(",\n"+gap)+"\n"+g+"}":"{"+h.join(",")+"}",gap=g,e}}"use strict";if(nativeJSON&&nativeJSON.parse)return exports.JSON={parse:nativeJSON.parse,stringify:nativeJSON.stringify};var JSON=exports.JSON={},cx=/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,escapable=/[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,gap,indent,meta={"\b":"\\b","\t":"\\t","\n":"\\n","\f":"\\f","\r":"\\r",'"':'\\"',"\\":"\\\\"},rep;JSON.stringify=function(a,b,c){var d;gap="",indent="";if(typeof c=="number")for(d=0;d<c;d+=1)indent+=" ";else typeof c=="string"&&(indent=c);rep=b;if(!b||typeof b=="function"||typeof b=="object"&&typeof b.length=="number")return str("",{"":a});throw new Error("JSON.stringify")},JSON.parse=function(text,reviver){function walk(a,b){var c,d,e=a[b];if(e&&typeof e=="object")for(c in e)Object.prototype.hasOwnProperty.call(e,c)&&(d=walk(e,c),d!==undefined?e[c]=d:delete e[c]);return reviver.call(a,b,e)}var j;text=String(text),cx.lastIndex=0,cx.test(text)&&(text=text.replace(cx,function(a){return"\\u"+("0000"+a.charCodeAt(0).toString(16)).slice(-4)}));if(/^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,"@").replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,"]").replace(/(?:^|:|,)(?:\s*\[)+/g,"")))return j=eval("("+text+")"),typeof reviver=="function"?walk({"":j},""):j;throw new SyntaxError("JSON.parse")}}("undefined"!=typeof io?io:module.exports,typeof JSON!="undefined"?JSON:undefined),function(a,b){var c=a.parser={},d=c.packets=["disconnect","connect","heartbeat","message","json","event","ack","error","noop"],e=c.reasons=["transport not supported","client not handshaken","unauthorized"],f=c.advice=["reconnect"],g=b.JSON,h=b.util.indexOf;c.encodePacket=function(a){var b=h(d,a.type),c=a.id||"",i=a.endpoint||"",j=a.ack,k=null;switch(a.type){case"error":var l=a.reason?h(e,a.reason):"",m=a.advice?h(f,a.advice):"";if(l!==""||m!=="")k=l+(m!==""?"+"+m:"");break;case"message":a.data!==""&&(k=a.data);break;case"event":var n={name:a.name};a.args&&a.args.length&&(n.args=a.args),k=g.stringify(n);break;case"json":k=g.stringify(a.data);break;case"connect":a.qs&&(k=a.qs);break;case"ack":k=a.ackId+(a.args&&a.args.length?"+"+g.stringify(a.args):"")}var o=[b,c+(j=="data"?"+":""),i];return k!==null&&k!==undefined&&o.push(k),o.join(":")},c.encodePayload=function(a){var b="";if(a.length==1)return a[0];for(var c=0,d=a.length;c<d;c++){var e=a[c];b+="\ufffd"+e.length+"\ufffd"+a[c]}return b};var i=/([^:]+):([0-9]+)?(\+)?:([^:]+)?:?([\s\S]*)?/;c.decodePacket=function(a){var b=a.match(i);if(!b)return{};var c=b[2]||"",a=b[5]||"",h={type:d[b[1]],endpoint:b[4]||""};c&&(h.id=c,b[3]?h.ack="data":h.ack=!0);switch(h.type){case"error":var b=a.split("+");h.reason=e[b[0]]||"",h.advice=f[b[1]]||"";break;case"message":h.data=a||"";break;case"event":try{var j=g.parse(a);h.name=j.name,h.args=j.args}catch(k){}h.args=h.args||[];break;case"json":try{h.data=g.parse(a)}catch(k){}break;case"connect":h.qs=a||"";break;case"ack":var b=a.match(/^([0-9]+)(\+)?(.*)/);if(b){h.ackId=b[1],h.args=[];if(b[3])try{h.args=b[3]?g.parse(b[3]):[]}catch(k){}}break;case"disconnect":case"heartbeat":}return h},c.decodePayload=function(a){if(a.charAt(0)=="\ufffd"){var b=[];for(var d=1,e="";d<a.length;d++)a.charAt(d)=="\ufffd"?(b.push(c.decodePacket(a.substr(d+1).substr(0,e))),d+=Number(e)+1,e=""):e+=a.charAt(d);return b}return[c.decodePacket(a)]}}("undefined"!=typeof io?io:module.exports,"undefined"!=typeof io?io:module.parent.exports),function(a,b){function c(a,b){this.socket=a,this.sessid=b}a.Transport=c,b.util.mixin(c,b.EventEmitter),c.prototype.heartbeats=function(){return!0},c.prototype.onData=function(a){this.clearCloseTimeout(),(this.socket.connected||this.socket.connecting||this.socket.reconnecting)&&this.setCloseTimeout();if(a!==""){var c=b.parser.decodePayload(a);if(c&&c.length)for(var d=0,e=c.length;d<e;d++)this.onPacket(c[d])}return this},c.prototype.onPacket=function(a){return this.socket.setHeartbeatTimeout(),a.type=="heartbeat"?this.onHeartbeat():(a.type=="connect"&&a.endpoint==""&&this.onConnect(),a.type=="error"&&a.advice=="reconnect"&&(this.isOpen=!1),this.socket.onPacket(a),this)},c.prototype.setCloseTimeout=function(){if(!this.closeTimeout){var a=this;this.closeTimeout=setTimeout(function(){a.onDisconnect()},this.socket.closeTimeout)}},c.prototype.onDisconnect=function(){return this.isOpen&&this.close(),this.clearTimeouts(),this.socket.onDisconnect(),this},c.prototype.onConnect=function(){return this.socket.onConnect(),this},c.prototype.clearCloseTimeout=function(){this.closeTimeout&&(clearTimeout(this.closeTimeout),this.closeTimeout=null)},c.prototype.clearTimeouts=function(){this.clearCloseTimeout(),this.reopenTimeout&&clearTimeout(this.reopenTimeout)},c.prototype.packet=function(a){this.send(b.parser.encodePacket(a))},c.prototype.onHeartbeat=function(a){this.packet({type:"heartbeat"})},c.prototype.onOpen=function(){this.isOpen=!0,this.clearCloseTimeout(),this.socket.onOpen()},c.prototype.onClose=function(){var a=this;this.isOpen=!1,this.socket.onClose(),this.onDisconnect()},c.prototype.prepareUrl=function(){var a=this.socket.options;return this.scheme()+"://"+a.host+":"+a.port+"/"+a.resource+"/"+b.protocol+"/"+this.name+"/"+this.sessid},c.prototype.ready=function(a,b){b.call(this)}}("undefined"!=typeof io?io:module.exports,"undefined"!=typeof io?io:module.parent.exports),function(a,b,c){function d(a){this.options={port:80,secure:!1,document:"document"in 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| * { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #canvas { | |
| background: #ccc; | |
| } |
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