!function(){function Asteroids(){function Vector(t,e){"Object"==typeof t?(this.x=t.x,this.y=t.y):(this.x=t,this.y=e)}function Line(t,e){this.p1=t,this.p2=e}window.ASTEROIDS||(window.ASTEROIDS={enemiesKilled:0}),Vector.prototype={cp:function(){return new Vector(this.x,this.y)},mul:function(t){return this.x*=t,this.y*=t,this},mulNew:function(t){return new Vector(this.x*t,this.y*t)},add:function(t){return this.x+=t.x,this.y+=t.y,this},addNew:function(t){return new Vector(this.x+t.x,this.y+t.y)},sub:function(t){return this.x-=t.x,this.y-=t.y,this},subNew:function(t){return new Vector(this.x-t.x,this.y-t.y)},rotate:function(t){var e=this.x,i=this.y;return this.x=e*Math.cos(t)-Math.sin(t)*i,this.y=e*Math.sin(t)+Math.cos(t)*i,this},rotateNew:function(t){return this.cp().rotate(t)},setAngle:function(t){var e=this.len();return this.x=Math.cos(t)*e,this.y=Math.sin(t)*e,this},setAngleNew:function(t){return this.cp().setAngle(t)},setLength:function(t){var e=this.len();return e?this.mul(t/e):this.x=this.y=t,this},setLengthNew:function(t){return this.cp().setLength(t)},normalize:function(){var t=this.len();return this.x/=t,this.y/=t,this},normalizeNew:function(){return this.cp().normalize()},angle:function(){return Math.atan2(this.y,this.x)},collidesWith:function(t){return this.x>t.x&&this.y>t.y&&this.x<t.x+t.width&&this.y<t.y+t.height},len:function(){var t=Math.sqrt(this.x*this.x+this.y*this.y);return t<.005&&-.005<t?0:t},is:function(t){return"object"==typeof t&&this.x==t.x&&this.y==t.y},toString:function(){return"[Vector("+this.x+", "+this.y+") angle: "+this.angle()+", length: "+this.len()+"]"}},Line.prototype={shift:function(t){this.p1.add(t),this.p2.add(t)},intersectsWithRect:function(t){var e=new Vector(t.x,t.y+t.height),i=new Vector(t.x,t.y),s=new Vector(t.x+t.width,t.y+t.height),n=new Vector(t.x+t.width,t.y);return this.p1.x>e.x&&this.p1.x<n.x&&this.p1.y<e.y&&this.p1.y>n.y&&this.p2.x>e.x&&this.p2.x<n.x&&this.p2.y<e.y&&this.p2.y>n.y||(!!this.intersectsLine(new Line(i,e))||(!!this.intersectsLine(new Line(e,s))||(!!this.intersectsLine(new Line(i,n))||!!this.intersectsLine(new Line(n,s)))))},intersectsLine:function(t){var e=this.p1,i=this.p2,s=t.p1,n=t.p2,a=(n.y-s.y)*(i.x-e.x)-(n.x-s.x)*(i.y-e.y),o=(n.x-s.x)*(e.y-s.y)-(n.y-s.y)*(e.x-s.x),h=(i.x-e.x)*(e.y-s.y)-(i.y-e.y)*(e.x-s.x);if(0==a)return!1;var r=o/a,l=h/a;return 0<=r&&r<=1&&0<=l&&l<=1}};var that=this,isIE=!!window.ActiveXObject,isIEQuirks=isIE&&"BackCompat"==document.compatMode,w=document.documentElement.clientWidth,h=document.documentElement.clientHeight;isIEQuirks&&(w=document.body.clientWidth,h=document.body.clientHeight);var playerWidth=20,playerHeight=30,playerVerts=[[-1*playerHeight/2,-1*playerWidth/2],[-1*playerHeight/2,playerWidth/2],[playerHeight/2,0]],ignoredTypes=["HTML","HEAD","BODY","SCRIPT","TITLE","META","STYLE","LINK"];window.ActiveXObject&&(ignoredTypes=["HTML","HEAD","BODY","SCRIPT","TITLE","META","STYLE","LINK","SHAPE","LINE","GROUP","IMAGE","STROKE","FILL","SKEW","PATH","TEXTPATH","INS"]);var hiddenTypes=["BR","HR"],FPS=50,acc=300,maxSpeed=600,rotSpeed=360,bulletSpeed=700,particleSpeed=400,timeBetweenFire=150,timeBetweenBlink=250,timeBetweenEnemyUpdate=isIE?1e4:2e3,bulletRadius=2,maxParticles=isIE?20:40,maxBullets=isIE?10:20,createFlames,W,X,Y,Z,$,_,aa;function updateEnemyIndex(){for(var t,e=0;t=that.enemies[e];e++)removeClass(t,"ASTEROIDSYEAHENEMY");var i=document.body.getElementsByTagName("*");that.enemies=[];var s;for(e=0;s=i[e];e++)-1==indexOf(ignoredTypes,s.tagName.toUpperCase())&&"g_vml_"!=s.prefix&&hasOnlyTextualChildren(s)&&"ASTEROIDSYEAH"!=s.className&&0<s.offsetHeight&&(s.aSize=size(s),that.enemies.push(s),addClass(s,"ASTEROIDSYEAHENEMY"),s.aAdded||(s.aAdded=!0,that.totalEnemies++))}function radians(t){return.0174532925*t}function degrees(t){return 57.2957795*t}function random(t,e){return Math.floor(Math.random()*(e+1)+t)}function code(t){var e={up:38,down:40,left:37,right:39,esc:27};return e[t]?e[t]:t.charCodeAt(0)}function boundsCheck(t){t.x>w?t.x=0:t.x<0&&(t.x=w),t.y>h?t.y=0:t.y<0&&(t.y=h)}function size(t){for(var e=t,i=0,s=0;i+=e.offsetLeft||0,s+=e.offsetTop||0,e=e.offsetParent;);return{x:i,y:s,width:t.offsetWidth||10,height:t.offsetHeight||10}}function addEvent(t,e,i){t.addEventListener?t.addEventListener(e,i,!1):t.attachEvent&&(t["e"+e+i]=i,t[e+i]=function(){t["e"+e+i](window.event)},t.attachEvent("on"+e,t[e+i]))}function removeEvent(t,e,i){t.removeEventListener?t.removeEventListener(e,i,!1):t.detachEvent&&(t.detachEvent("on"+e,t[e+i]),t[e+i]=null,t["e"+e+i]=null)}function arrayRemove(t,e,i){var s=t.slice((i||e)+1||t.length);return t.length=e<0?t.length+e:e,t.push.apply(t,s)}function applyVisibility(t){for(var e,i=0;e=window.ASTEROIDSPLAYERS[i];i++)e.gameContainer.style.visibility=t}function getElementFromPoint(t,e){applyVisibility("hidden");var i=document.elementFromPoint(t,e);return i?(3==i.nodeType&&(i=i.parentNode),applyVisibility("visible"),i):(applyVisibility("visible"),!1)}function addParticles(t){for(var e=(new Date).getTime(),i=maxParticles,s=0;s<i;s++)that.particles.push({dir:new Vector(20*Math.random()-10,20*Math.random()-10).normalize(),pos:t.cp(),cameAlive:e})}function setScore(){that.points.innerHTML=10*window.ASTEROIDS.enemiesKilled}function hasOnlyTextualChildren(t){if(!(t.offsetLeft<-100&&0<t.offsetWidth&&0<t.offsetHeight)){if(-1!=indexOf(hiddenTypes,t.tagName))return 1;if(0!=t.offsetWidth||0!=t.offsetHeight){for(var e=0;e<t.childNodes.length;e++)if(-1==indexOf(hiddenTypes,t.childNodes[e].tagName)&&0!=t.childNodes[e].childNodes.length)return;return 1}}}function indexOf(t,e,i){if(t.indexOf)return t.indexOf(e,i);for(var s=t.length,n=i<0?Math.max(0,s+i):i||0;n<s;n++)if(t[n]===e)return n;return-1}function addClass(t,e){-1==t.className.indexOf(e)&&(t.className=(t.className+" "+e).replace(/\s+/g," ").replace(/^\s+|\s+$/g,""))}function removeClass(t,e){t.className=t.className.replace(new RegExp("(^|\\s)"+e+"(?:\\s|$)"),"$1")}function addStylesheet(e,i){var s=document.createElement("style");s.type="text/css",s.rel="stylesheet",s.id="ASTEROIDSYEAHSTYLES";try{s.innerHTML=e+"{"+i+"}"}catch(t){s.styleSheet.addRule(e,i)}document.getElementsByTagName("head")[0].appendChild(s)}function removeStylesheet(t){var e=document.getElementById(t);e&&e.parentNode.removeChild(e)}with(this.flame={r:[],y:[]},this.toggleBlinkStyle=function(){(this.updated.blink.isActive?removeClass:addClass)(document.body,"ASTEROIDSBLINK"),this.updated.blink.isActive=!this.updated.blink.isActive},addStylesheet(".ASTEROIDSBLINK .ASTEROIDSYEAHENEMY","outline: 2px dotted red;"),this.pos=new Vector(100,100),this.lastPos=!1,this.vel=new Vector(0,0),this.dir=new Vector(0,1),this.keysPressed={},this.firedAt=!1,this.updated={enemies:!1,flame:(new Date).getTime(),blink:{time:0,isActive:!1}},this.scrollPos=new Vector(0,0),this.bullets=[],this.enemies=[],this.dying=[],this.totalEnemies=0,this.particles=[],updateEnemyIndex(),W=playerWidth,X=.1*playerWidth,Y=.6*playerWidth,Z=.2*Y,$=W/2,_=Y/2,aa=playerHeight/2,createFlames=function(){that.flame.r=[[-1*aa,-1*$]],that.flame.y=[[-1*aa,-1*_]];for(var t=0;t<W;t+=X)that.flame.r.push([-random(2,7)-aa,t-$]);that.flame.r.push([-1*aa,$]);for(t=0;t<Y;t+=Z)that.flame.y.push([-random(2,7)-aa,t-_]);that.flame.y.push([-1*aa,_])},createFlames(),this.gameContainer=document.createElement("div"),this.gameContainer.className="ASTEROIDSYEAH",document.body.appendChild(this.gameContainer),this.canvas=document.createElement("canvas"),this.canvas.setAttribute("width",w),this.canvas.setAttribute("height",h),this.canvas.className="ASTEROIDSYEAH",this.canvas.style)width=w+"px",height=h+"px",position="fixed",top="0px",left="0px",bottom="0px",right="0px",zIndex="10000";"undefined"!=typeof G_vmlCanvasManager?(this.canvas=G_vmlCanvasManager.initElement(this.canvas),this.canvas.getContext||alert("So... you're using IE?  Please join me at http://github.com/erkie/erkie.github.com if you think you can help")):this.canvas.getContext||alert("This program does not yet support your browser. Please join me at http://github.com/erkie/erkie.github.com if you think you can help"),addEvent(this.canvas,"mousedown",function(t){t=t||window.event;var e=document.createElement("span");e.style.position="absolute",e.style.border="1px solid #999",e.style.background="white",e.style.color="black",e.innerHTML="Press Esc to quit",document.body.appendChild(e);var i=t.pageX||t.clientX+document.documentElement.scrollLeft,s=t.pageY||t.clientY+document.documentElement.scrollTop;e.style.left=i-e.offsetWidth/2+"px",e.style.top=s-e.offsetHeight/2+"px",setTimeout(function(){try{e.parentNode.removeChild(e)}catch(t){}},1e3)});var eventResize=function(){if(isIE)w=document.documentElement.clientWidth,h=document.documentElement.clientHeight,isIEQuirks&&(w=document.body.clientWidth,h=document.body.clientHeight),that.canvas.setAttribute("width",w),that.canvas.setAttribute("height",h);else with(that.canvas.style.display="none",w=document.documentElement.clientWidth,h=document.documentElement.clientHeight,that.canvas.setAttribute("width",w),that.canvas.setAttribute("height",h),that.canvas.style)display="block",width=w+"px",height=h+"px"};if(addEvent(window,"resize",eventResize),this.gameContainer.appendChild(this.canvas),this.ctx=this.canvas.getContext("2d"),this.ctx.fillStyle="black",this.ctx.strokeStyle="black",document.getElementById("ASTEROIDS-NAVIGATION"))this.navigation=document.getElementById("ASTEROIDS-NAVIGATION"),this.points=document.getElementById("ASTEROIDS-POINTS");else{with(this.navigation=document.createElement("div"),this.navigation.id="ASTEROIDS-NAVIGATION",this.navigation.className="ASTEROIDSYEAH",this.navigation.style)fontFamily="Arial,sans-serif",position="fixed",zIndex="10001",bottom="10px",right="10px",textAlign="right";this.navigation.innerHTML="(press esc to quit) ",this.gameContainer.appendChild(this.navigation),this.points=document.createElement("span"),this.points.id="ASTEROIDS-POINTS",this.points.style.font="28pt Arial, sans-serif",this.points.style.fontWeight="bold",this.points.className="ASTEROIDSYEAH",this.navigation.appendChild(this.points)}if(isIEQuirks&&(this.gameContainer.style.position=this.canvas.style.position=this.navigation.style.position="absolute"),setScore(),"undefined"!=typeof G_vmlCanvasManager)for(var children=this.canvas.getElementsByTagName("*"),i=0,c;c=children[i];i++)addClass(c,"ASTEROIDSYEAH");var eventKeydown=function(t){switch(t=t||window.event,that.keysPressed[t.keyCode]=!0,t.keyCode){case code(" "):that.firedAt=1}if(-1!=indexOf([code("up"),code("down"),code("right"),code("left"),code(" "),code("B"),code("W"),code("A"),code("S"),code("D")],t.keyCode))return t.preventDefault&&t.preventDefault(),t.stopPropagation&&t.stopPropagation(),t.returnValue=!1,!(t.cancelBubble=!0)};addEvent(document,"keydown",eventKeydown);var eventKeypress=function(t){if(t=t||window.event,-1!=indexOf([code("up"),code("down"),code("right"),code("left"),code(" "),code("W"),code("A"),code("S"),code("D")],t.keyCode||t.which))return t.preventDefault&&t.preventDefault(),t.stopPropagation&&t.stopPropagation(),t.returnValue=!1,!(t.cancelBubble=!0)};addEvent(document,"keypress",eventKeypress);var eventKeyup=function(t){if(t=t||window.event,that.keysPressed[t.keyCode]=!1,-1!=indexOf([code("up"),code("down"),code("right"),code("left"),code(" "),code("B"),code("W"),code("A"),code("S"),code("D")],t.keyCode))return t.preventDefault&&t.preventDefault(),t.stopPropagation&&t.stopPropagation(),t.returnValue=!1,!(t.cancelBubble=!0)};addEvent(document,"keyup",eventKeyup),this.ctx.clear=function(){this.clearRect(0,0,w,h)},this.ctx.clear(),this.ctx.drawLine=function(t,e,i,s){this.beginPath(),this.moveTo(t,e),this.lineTo(i,s),this.lineTo(i+1,s+1),this.closePath(),this.fill()},this.ctx.tracePoly=function(t){this.beginPath(),this.moveTo(t[0][0],t[0][1]);for(var e=1;e<t.length;e++)this.lineTo(t[e][0],t[e][1]);this.closePath()},this.ctx.drawPlayer=function(){this.save(),this.translate(that.pos.x,that.pos.y),this.rotate(that.dir.angle()),this.tracePoly(playerVerts),this.fillStyle="white",this.fill(),this.tracePoly(playerVerts),this.stroke(),this.restore()};var PI_SQ=2*Math.PI;this.ctx.drawBullets=function(t){for(var e=0;e<t.length;e++)this.beginPath(),this.arc(t[e].pos.x,t[e].pos.y,bulletRadius,0,PI_SQ,!0),this.closePath(),this.fill()};var randomParticleColor=function(){return["red","yellow"][random(0,1)]};this.ctx.drawParticles=function(t){for(var e=this.fillStyle,i=0;i<t.length;i++)this.fillStyle=randomParticleColor(),this.drawLine(t[i].pos.x,t[i].pos.y,t[i].pos.x-10*t[i].dir.x,t[i].pos.y-10*t[i].dir.y);this.fillStyle=e},this.ctx.drawFlames=function(t){this.save(),this.translate(that.pos.x,that.pos.y),this.rotate(that.dir.angle());var e=this.strokeStyle;this.strokeStyle="red",this.tracePoly(t.r),this.stroke(),this.strokeStyle="yellow",this.tracePoly(t.y),this.stroke(),this.strokeStyle=e,this.restore()};try{window.focus()}catch(t){}addParticles(this.pos),addClass(document.body,"ASTEROIDSYEAH");var isRunning=!0,lastUpdate=(new Date).getTime();this.update=function(){var t=!1,e=(new Date).getTime(),i=(e-lastUpdate)/1e3,s=!1;if(50<(lastUpdate=e)-this.updated.flame&&(createFlames(),this.updated.flame=e),this.scrollPos.x=window.pageXOffset||document.documentElement.scrollLeft,this.scrollPos.y=window.pageYOffset||document.documentElement.scrollTop,this.keysPressed[code("up")]||this.keysPressed[code("W")]?(this.vel.add(this.dir.mulNew(acc*i)),s=!0):this.vel.mul(.96),(this.keysPressed[code("left")]||this.keysPressed[code("A")])&&(t=!0,this.dir.rotate(radians(rotSpeed*i*-1))),(this.keysPressed[code("right")]||this.keysPressed[code("D")])&&(t=!0,this.dir.rotate(radians(rotSpeed*i))),this.keysPressed[code(" ")]&&e-this.firedAt>timeBetweenFire&&(this.bullets.unshift({dir:this.dir.cp(),pos:this.pos.cp(),startVel:this.vel.cp(),cameAlive:e}),this.firedAt=e,this.bullets.length>maxBullets&&this.bullets.pop()),this.keysPressed[code("B")]?(this.updated.enemies||(updateEnemyIndex(),this.updated.enemies=!0),t=!0,this.updated.blink.time+=1e3*i,this.updated.blink.time>timeBetweenBlink&&(this.toggleBlinkStyle(),this.updated.blink.time=0)):this.updated.enemies=!1,this.keysPressed[code("esc")])destroy.apply(this);else{this.vel.len()>maxSpeed&&this.vel.setLength(maxSpeed),this.pos.add(this.vel.mulNew(i)),this.pos.x>w?(window.scrollTo(this.scrollPos.x+50,this.scrollPos.y),this.pos.x=0):this.pos.x<0&&(window.scrollTo(this.scrollPos.x-50,this.scrollPos.y),this.pos.x=w),this.pos.y>h?(window.scrollTo(this.scrollPos.x,this.scrollPos.y+.75*h),this.pos.y=0):this.pos.y<0&&(window.scrollTo(this.scrollPos.x,this.scrollPos.y-.75*h),this.pos.y=h);for(var n=this.bullets.length-1;0<=n;n--)if(2e3<e-this.bullets[n].cameAlive)this.bullets.splice(n,1),t=!0;else{var a=this.bullets[n].dir.setLengthNew(bulletSpeed*i).add(this.bullets[n].startVel.mulNew(i));this.bullets[n].pos.add(a),boundsCheck(this.bullets[n].pos);var o=getElementFromPoint(this.bullets[n].pos.x,this.bullets[n].pos.y);o&&o.tagName&&-1==indexOf(ignoredTypes,o.tagName.toUpperCase())&&hasOnlyTextualChildren(o)&&"ASTEROIDSYEAH"!=o.className&&(didKill=!0,addParticles(this.bullets[n].pos),this.dying.push(o),this.bullets.splice(n,1))}if(this.dying.length){for(n=this.dying.length-1;0<=n;n--)try{this.dying[n].parentNode&&window.ASTEROIDS.enemiesKilled++,this.dying[n].parentNode.removeChild(this.dying[n])}catch(t){}setScore(),this.dying=[]}for(n=this.particles.length-1;0<=n;n--)this.particles[n].pos.add(this.particles[n].dir.mulNew(particleSpeed*i*Math.random())),1e3<e-this.particles[n].cameAlive&&(this.particles.splice(n,1),t=!0);isIEQuirks&&(this.gameContainer.style.left=this.canvas.style.left=document.documentElement.scrollLeft+"px",this.gameContainer.style.top=this.canvas.style.top=document.documentElement.scrollTop+"px",this.navigation.style.right="10px",this.navigation.style.top=document.documentElement.scrollTop+document.body.clientHeight-this.navigation.clientHeight-10+"px"),(t||0!=this.bullets.length||0!=this.particles.length||!this.pos.is(this.lastPos)||0<this.vel.len())&&(this.ctx.clear(),this.ctx.drawPlayer(),s&&this.ctx.drawFlames(that.flame),this.bullets.length&&this.ctx.drawBullets(this.bullets),this.particles.length&&this.ctx.drawParticles(this.particles)),this.lastPos=this.pos}};var updateFunc=function(){try{that.update.call(that)}catch(t){throw clearInterval(interval),t}},interval=setInterval(updateFunc,1e3/FPS);function destroy(){removeEvent(document,"keydown",eventKeydown),removeEvent(document,"keypress",eventKeypress),removeEvent(document,"keyup",eventKeyup),removeEvent(window,"resize",eventResize),isRunning=!1,removeStylesheet("ASTEROIDSYEAHSTYLES"),removeClass(document.body,"ASTEROIDSYEAH"),this.gameContainer.parentNode.removeChild(this.gameContainer)}}if(window.ASTEROIDSPLAYERS||(window.ASTEROIDSPLAYERS=[]),window.ActiveXObject&&!document.createElement("canvas").getContext){try{var xamlScript=document.createElement("script");xamlScript.setAttribute("type","text/xaml"),xamlScript.textContent='<?xml version="1.0"?><Canvas xmlns="http://schemas.microsoft.com/client/2007"></Canvas>',document.getElementsByTagName("head")[0].appendChild(xamlScript)}catch(t){}var script=document.createElement("script");script.setAttribute("type","text/javascript"),script.onreadystatechange=function(){"loaded"!=script.readyState&&"complete"!=script.readyState||"undefined"!=typeof G_vmlCanvasManager&&(window.ASTEROIDSPLAYERS[window.ASTEROIDSPLAYERS.length]=new Asteroids)},script.src="http://erkie.github.com/excanvas.js",document.getElementsByTagName("head")[0].appendChild(script)}else window.ASTEROIDSPLAYERS[window.ASTEROIDSPLAYERS.length]=new Asteroids}();