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bug-min.js
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bug-min.js
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/*
Bug.js - https://github.com/Auz/Bug
Released under MIT-style license.
Original Screen Bug http://screen-bug.googlecode.com/git/index.html
*/
var BugDispatch={options:{minDelay:500,maxDelay:1E4,minBugs:2,maxBugs:20,minSpeed:5,maxSpeed:10,maxLargeTurnDeg:150,maxSmallTurnDeg:10,maxWiggleDeg:5,imageSprite:"fly-sprite.png",bugWidth:13,bugHeight:14,num_frames:5,zoom:10,canFly:!0,canDie:!0,numDeathTypes:3,monitorMouseMovement:!1,eventDistanceToBug:40,minTimeBetweenMultipy:1E3,mouseOver:"random"},initialize:function(a){this.options=mergeOptions(this.options,a);this.options.minBugs>this.options.maxBugs&&(this.options.minBugs=this.options.maxBugs);
this.modes=["multiply","nothing"];this.options.canFly&&this.modes.push("fly","flyoff");this.options.canDie&&this.modes.push("die");-1==this.modes.indexOf(this.options.mouseOver)&&(this.options.mouseOver="random");this.transform=null;this.transforms={Moz:function(a){this.bug.style.MozTransform=a},webkit:function(a){this.bug.style.webkitTransform=a},O:function(a){this.bug.style.OTransform=a},ms:function(a){this.bug.style.msTransform=a},Khtml:function(a){this.bug.style.KhtmlTransform=a},w3c:function(a){this.bug.style.transform=
a}};if("transform"in document.documentElement.style)this.transform=this.transforms.w3c;else{var b=["Moz","webkit","O","ms","Khtml"],c=0;for(c=0;c<b.length;c++)if(b[c]+"Transform"in document.documentElement.style){this.transform=this.transforms[b[c]];break}}if(this.transform){this.bugs=[];b="multiply"===this.options.mouseOver?this.options.minBugs:this.random(this.options.minBugs,this.options.maxBugs,!0);c=0;var d=this;for(c=0;c<b;c++){a=JSON.parse(JSON.stringify(this.options));var e=SpawnBug();a.wingsOpen=
this.options.canFly?.5<Math.random()?!0:!1:!0;a.walkSpeed=this.random(this.options.minSpeed,this.options.maxSpeed);e.initialize(this.transform,a);this.bugs.push(e)}this.spawnDelay=[];for(c=0;c<b;c++)a=this.random(this.options.minDelay,this.options.maxDelay,!0),e=this.bugs[c],this.spawnDelay[c]=setTimeout(function(a){return function(){d.options.canFly?a.flyIn():a.walkIn()}}(e),a),d.add_events_to_bug(e);this.options.monitorMouseMovement&&(window.onmousemove=function(){d.check_if_mouse_close_to_bug()})}},
stop:function(){for(var a=0;a<this.bugs.length;a++)this.spawnDelay[a]&&clearTimeout(this.spawnDelay[a]),this.bugs[a].stop()},end:function(){for(var a=0;a<this.bugs.length;a++)this.spawnDelay[a]&&clearTimeout(this.spawnDelay[a]),this.bugs[a].stop(),this.bugs[a].remove()},reset:function(){this.stop();for(var a=0;a<this.bugs.length;a++)this.bugs[a].reset(),this.bugs[a].walkIn()},killAll:function(){for(var a=0;a<this.bugs.length;a++)this.spawnDelay[a]&&clearTimeout(this.spawnDelay[a]),this.bugs[a].die()},
add_events_to_bug:function(a){var b=this;a.bug&&(a.bug.addEventListener?a.bug.addEventListener("mouseover",function(c){b.on_bug(a)}):a.bug.attachEvent&&a.bug.attachEvent("onmouseover",function(c){b.on_bug(a)}))},check_if_mouse_close_to_bug:function(a){if(a=a||window.event){var b=0,c=0;a.client&&a.client.x?(b=a.client.x,c=a.client.y):a.clientX?(b=a.clientX,c=a.clientY):a.page&&a.page.x?(b=a.page.x-(document.body.scrollLeft+document.documentElement.scrollLeft),c=a.page.y-(document.body.scrollTop+document.documentElement.scrollTop)):
a.pageX&&(b=a.pageX-(document.body.scrollLeft+document.documentElement.scrollLeft),c=a.pageY-(document.body.scrollTop+document.documentElement.scrollTop));a=this.bugs.length;var d;for(d=0;d<a;d++){var e=this.bugs[d].getPos();e&&Math.abs(e.top-c)+Math.abs(e.left-b)<this.options.eventDistanceToBug&&!this.bugs[d].flyperiodical&&this.near_bug(this.bugs[d])}}},near_bug:function(a){this.on_bug(a)},on_bug:function(a){if(a.alive){var b=this.options.mouseOver;"random"===b&&(b=this.modes[this.random(0,this.modes.length-
1,!0)]);if("fly"===b)a.stop(),a.flyRand();else if("nothing"!==b)if("flyoff"===b)a.stop(),a.flyOff();else if("die"===b)a.die();else if("multiply"===b&&!this.multiplyDelay&&this.bugs.length<this.options.maxBugs){var c=SpawnBug();b=JSON.parse(JSON.stringify(this.options));var d=a.getPos(),e=this;b.wingsOpen=this.options.canFly?.5<Math.random()?!0:!1:!0;b.walkSpeed=this.random(this.options.minSpeed,this.options.maxSpeed);c.initialize(this.transform,b);c.drawBug(d.top,d.left);b.canFly?(c.flyRand(),a.flyRand()):
(c.go(),a.go());this.bugs.push(c);this.multiplyDelay=!0;setTimeout(function(){e.add_events_to_bug(c);e.multiplyDelay=!1},this.options.minTimeBetweenMultipy)}}},random:function(a,b,c){if(a==b)return c?Math.round(a):a;var d=a-.5+Math.random()*(b-a+1);d>b?d=b:d<a&&(d=a);return c?Math.round(d):d}},BugController=function(){this.initialize.apply(this,arguments)};BugController.prototype=BugDispatch;
var SpiderController=function(){this.options=mergeOptions(this.options,{imageSprite:"spider-sprite.png",bugWidth:69,bugHeight:90,num_frames:7,canFly:!1,canDie:!0,numDeathTypes:2,zoom:6,minDelay:200,maxDelay:3E3,minSpeed:6,maxSpeed:13,minBugs:3,maxBugs:10});this.initialize.apply(this,arguments)};SpiderController.prototype=BugDispatch;
var Bug={options:{wingsOpen:!1,walkSpeed:2,flySpeed:40,edge_resistance:50,zoom:10},initialize:function(a,b){this.options=mergeOptions(this.options,b);this.NEAR_TOP_EDGE=1;this.NEAR_BOTTOM_EDGE=2;this.NEAR_LEFT_EDGE=4;this.NEAR_RIGHT_EDGE=8;this.directions={};this.directions[this.NEAR_TOP_EDGE]=270;this.directions[this.NEAR_BOTTOM_EDGE]=90;this.directions[this.NEAR_LEFT_EDGE]=0;this.directions[this.NEAR_RIGHT_EDGE]=180;this.directions[this.NEAR_TOP_EDGE+this.NEAR_LEFT_EDGE]=315;this.directions[this.NEAR_TOP_EDGE+
this.NEAR_RIGHT_EDGE]=225;this.directions[this.NEAR_BOTTOM_EDGE+this.NEAR_LEFT_EDGE]=45;this.directions[this.NEAR_BOTTOM_EDGE+this.NEAR_RIGHT_EDGE]=135;this.large_turn_angle_deg=this.angle_rad=this.angle_deg=0;this.near_edge=!1;this.edge_test_counter=10;this.fly_counter=this.large_turn_counter=this.small_turn_counter=0;this.toggle_stationary_counter=50*Math.random();this.zoom=this.random(this.options.zoom,10)/10;this.stationary=!1;this.bug=null;this.active=!0;this.wingsOpen=this.options.wingsOpen;
this.transform=a;this.flyIndex=this.walkIndex=0;this.alive=!0;this.twitchTimer=null;this.rad2deg_k=180/Math.PI;this.deg2rad_k=Math.PI/180;this.makeBug();this.angle_rad=this.deg2rad(this.angle_deg);this.angle_deg=this.random(0,360,!0)},go:function(){if(this.transform){this.drawBug();var a=this;this.animating=!0;this.going=requestAnimFrame(function(b){a.animate(b)})}},stop:function(){this.animating=!1;this.going&&(clearTimeout(this.going),this.going=null);this.flyperiodical&&(clearTimeout(this.flyperiodical),
this.flyperiodical=null);this.twitchTimer&&(clearTimeout(this.twitchTimer),this.twitchTimer=null)},remove:function(){this.active=!1;this.inserted&&this.bug.parentNode&&(this.bug.parentNode.removeChild(this.bug),this.inserted=!1)},reset:function(){this.active=this.alive=!0;this.bug.style.bottom="";this.bug.style.top=0;this.bug.style.left=0;this.bug.classList.remove("bug-dead")},animate:function(a){if(this.animating&&this.alive&&this.active){var b=this;this.going=requestAnimFrame(function(a){b.animate(a)});
"_lastTimestamp"in this||(this._lastTimestamp=a);var c=a-this._lastTimestamp;if(!(40>c||(200<c&&(c=200),this._lastTimestamp=a,0>=--this.toggle_stationary_counter&&this.toggleStationary(),this.stationary))){if(0>=--this.edge_test_counter&&this.bug_near_window_edge()&&(this.angle_deg%=360,0>this.angle_deg&&(this.angle_deg+=360),15<Math.abs(this.directions[this.near_edge]-this.angle_deg))){a=this.directions[this.near_edge]-this.angle_deg;var d=360-this.angle_deg+this.directions[this.near_edge];this.large_turn_angle_deg=
Math.abs(a)<Math.abs(d)?a:d;this.edge_test_counter=10;this.large_turn_counter=100;this.small_turn_counter=30}0>=--this.large_turn_counter&&(this.large_turn_angle_deg=this.random(1,this.options.maxLargeTurnDeg,!0),this.next_large_turn());if(0>=--this.small_turn_counter)this.angle_deg+=this.random(1,this.options.maxSmallTurnDeg),this.next_small_turn();else{a=this.random(1,this.options.maxWiggleDeg,!0);if(0<this.large_turn_angle_deg&&0>a||0>this.large_turn_angle_deg&&0<a)a=-a;this.large_turn_angle_deg-=
a;this.angle_deg+=a}this.angle_rad=this.deg2rad(this.angle_deg);this.moveBug(this.bug.left+c/100*this.options.walkSpeed*Math.cos(this.angle_rad),this.bug.top+c/100*this.options.walkSpeed*-Math.sin(this.angle_rad),90-this.angle_deg);this.walkFrame()}}},makeBug:function(){if(!this.bug&&this.active){var a=this.wingsOpen?"0":"-"+this.options.bugHeight+"px",b=document.createElement("div");b.className="bug";b.style.background="transparent url("+this.options.imageSprite+") no-repeat 0 "+a;b.style.width=
this.options.bugWidth+"px";b.style.height=this.options.bugHeight+"px";b.style.position="fixed";b.style.top=0;b.style.left=0;b.style.zIndex="9999999";this.bug=b;this.setPos()}},setPos:function(a,b){this.bug.top=a||this.random(this.options.edge_resistance,document.documentElement.clientHeight-this.options.edge_resistance);this.bug.left=b||this.random(this.options.edge_resistance,document.documentElement.clientWidth-this.options.edge_resistance);this.moveBug(this.bug.left,this.bug.top,90-this.angle_deg)},
moveBug:function(a,b,c){this.bug.left=a;this.bug.top=b;a="translate("+parseInt(a)+"px,"+parseInt(b)+"px)";c&&(a+=" rotate("+c+"deg)");a+=" scale("+this.zoom+")";this.transform(a)},drawBug:function(a,b){this.bug||this.makeBug();this.bug&&(a&&b?this.setPos(a,b):this.setPos(this.bug.top,this.bug.left),this.inserted||(this.inserted=!0,document.body.appendChild(this.bug)))},toggleStationary:function(){this.stationary=!this.stationary;this.next_stationary();var a=this.wingsOpen?"0":"-"+this.options.bugHeight+
"px";this.bug.style.backgroundPosition=this.stationary?"0 "+a:"-"+this.options.bugWidth+"px "+a},walkFrame:function(){this.bug.style.backgroundPosition=-1*this.walkIndex*this.options.bugWidth+"px "+(this.wingsOpen?"0":"-"+this.options.bugHeight+"px");this.walkIndex++;this.walkIndex>=this.options.num_frames&&(this.walkIndex=0)},fly:function(a){var b=this.bug.top,c=this.bug.left,d=c-a.left,e=b-a.top,f=Math.atan(e/d);50>Math.abs(d)+Math.abs(e)&&(this.bug.style.backgroundPosition=-2*this.options.bugWidth+
"px -"+2*this.options.bugHeight+"px");30>Math.abs(d)+Math.abs(e)&&(this.bug.style.backgroundPosition=-1*this.options.bugWidth+"px -"+2*this.options.bugHeight+"px");if(10>Math.abs(d)+Math.abs(e))this.bug.style.backgroundPosition="0 0",this.stop(),this.go();else{var g=Math.cos(f)*this.options.flySpeed;f=Math.sin(f)*this.options.flySpeed;if(c>a.left&&0<g||c>a.left&&0>g)g*=-1,Math.abs(d)<Math.abs(g)&&(g/=4);if(b<a.top&&0>f||b>a.top&&0<f)f*=-1,Math.abs(e)<Math.abs(f)&&(f/=4);this.moveBug(c+g,b+f)}},flyRand:function(){this.stop();
var a={};a.top=this.random(this.options.edge_resistance,document.documentElement.clientHeight-this.options.edge_resistance);a.left=this.random(this.options.edge_resistance,document.documentElement.clientWidth-this.options.edge_resistance);this.startFlying(a)},startFlying:function(a){var b=this.bug.top,c=this.bug.left,d=a.left-c,e=a.top-b;this.bug.left=a.left;this.bug.top=a.top;this.angle_rad=Math.atan(e/d);this.angle_deg=this.rad2deg(this.angle_rad);this.angle_deg=0<d?90+this.angle_deg:270+this.angle_deg;
this.moveBug(c,b,this.angle_deg);var f=this;this.flyperiodical=setInterval(function(){f.fly(a)},10)},flyIn:function(){this.bug||this.makeBug();if(this.bug){this.stop();var a=Math.round(4*Math.random()-.5),b=document,c=b.documentElement,d=b.getElementsByTagName("body")[0];b=window.innerWidth||c.clientWidth||d.clientWidth;c=window.innerHeight||c.clientHeight||d.clientHeight;3<a&&(a=3);0>a&&(a=0);0===a?(a=-2*this.options.bugHeight,b*=Math.random()):1===a?(a=Math.random()*c,b+=2*this.options.bugWidth):
2===a?(a=c+2*this.options.bugHeight,b*=Math.random()):(a=Math.random()*c,b=-3*this.options.bugWidth);this.bug.style.backgroundPosition=-3*this.options.bugWidth+"px "+(this.wingsOpen?"0":"-"+this.options.bugHeight+"px");this.bug.top=a;this.bug.left=b;this.drawBug();a={};a.top=this.random(this.options.edge_resistance,document.documentElement.clientHeight-this.options.edge_resistance);a.left=this.random(this.options.edge_resistance,document.documentElement.clientWidth-this.options.edge_resistance);this.startFlying(a)}},
walkIn:function(){this.bug||this.makeBug();if(this.bug){this.stop();var a=Math.round(4*Math.random()-.5),b=document,c=b.documentElement,d=b.getElementsByTagName("body")[0];b=window.innerWidth||c.clientWidth||d.clientWidth;c=window.innerHeight||c.clientHeight||d.clientHeight;3<a&&(a=3);0>a&&(a=0);0===a?(a=-1.3*this.options.bugHeight,b*=Math.random()):1===a?(a=Math.random()*c,b+=.3*this.options.bugWidth):2===a?(a=c+.3*this.options.bugHeight,b*=Math.random()):(a=Math.random()*c,b=-1.3*this.options.bugWidth);
this.bug.style.backgroundPosition=-3*this.options.bugWidth+"px "+(this.wingsOpen?"0":"-"+this.options.bugHeight+"px");this.bug.top=a;this.bug.left=b;this.drawBug();this.go()}},flyOff:function(){this.stop();var a=this.random(0,3),b={},c=document,d=c.documentElement,e=c.getElementsByTagName("body")[0];c=window.innerWidth||d.clientWidth||e.clientWidth;d=window.innerHeight||d.clientHeight||e.clientHeight;0===a?(b.top=-200,b.left=Math.random()*c):1===a?(b.top=Math.random()*d,b.left=c+200):2===a?(b.top=
d+200,b.left=Math.random()*c):(b.top=Math.random()*d,b.left=-200);this.startFlying(b)},die:function(){this.stop();var a=this.random(0,this.options.numDeathTypes-1);this.alive=!1;this.drop(a)},drop:function(a){var b=this.bug.top,c=document,d=c.documentElement;c=c.getElementsByTagName("body")[0];var e=window.innerHeight||d.clientHeight||c.clientHeight;e-=this.options.bugHeight;var f=this.random(0,20,!0);Date.now();var g=this;this.bug.classList.add("bug-dead");this.dropTimer=requestAnimFrame(function(c){g._lastTimestamp=
c;g.dropping(c,b,e,f,a)})},dropping:function(a,b,c,d,e){a-=this._lastTimestamp;var f=b+.002*a*a,g=this;f>=c?(f=c,clearTimeout(this.dropTimer),this.angle_deg=0,this.angle_rad=this.deg2rad(this.angle_deg),this.transform("rotate("+(90-this.angle_deg)+"deg) scale("+this.zoom+")"),this.bug.style.top=null,this.bug.style.bottom=Math.ceil((this.options.bugWidth*this.zoom-this.options.bugHeight*this.zoom)/2-this.options.bugHeight/2*(1-this.zoom))+"px",this.bug.style.left=this.bug.left+"px",this.bug.style.backgroundPosition=
"-"+2*e*this.options.bugWidth+"px 100%",this.twitch(e)):(this.dropTimer=requestAnimFrame(function(a){g.dropping(a,b,c,d,e)}),20>a||(this.angle_deg=(this.angle_deg+d)%360,this.angle_rad=this.deg2rad(this.angle_deg),this.moveBug(this.bug.left,f,this.angle_deg)))},twitch:function(a,b){b||(b=0);var c=this;if(0===a||1===a)c.twitchTimer=setTimeout(function(){c.bug.style.backgroundPosition="-"+(2*a+b%2)*c.options.bugWidth+"px 100%";c.twitchTimer=setTimeout(function(){b++;c.bug.style.backgroundPosition="-"+
(2*a+b%2)*c.options.bugWidth+"px 100%";c.twitch(a,++b)},c.random(300,800))},this.random(1E3,1E4))},rad2deg:function(a){return a*this.rad2deg_k},deg2rad:function(a){return a*this.deg2rad_k},random:function(a,b,c){if(a==b)return a;a=Math.round(a-.5+Math.random()*(b-a+1));return c?.5<Math.random()?a:-a:a},next_small_turn:function(){this.small_turn_counter=Math.round(10*Math.random())},next_large_turn:function(){this.large_turn_counter=Math.round(40*Math.random())},next_stationary:function(){this.toggle_stationary_counter=
this.random(50,300)},bug_near_window_edge:function(){this.near_edge=0;this.bug.top<this.options.edge_resistance?this.near_edge|=this.NEAR_TOP_EDGE:this.bug.top>document.documentElement.clientHeight-this.options.edge_resistance&&(this.near_edge|=this.NEAR_BOTTOM_EDGE);this.bug.left<this.options.edge_resistance?this.near_edge|=this.NEAR_LEFT_EDGE:this.bug.left>document.documentElement.clientWidth-this.options.edge_resistance&&(this.near_edge|=this.NEAR_RIGHT_EDGE);return this.near_edge},getPos:function(){return this.inserted&&
this.bug&&this.bug.style?{top:parseInt(this.bug.top,10),left:parseInt(this.bug.left,10)}:null}},SpawnBug=function(){var a={},b;for(b in Bug)Bug.hasOwnProperty(b)&&(a[b]=Bug[b]);return a},mergeOptions=function(a,b,c){"undefined"==typeof c&&(c=!0);a=c?cloneOf(a):a;for(var d in b)b.hasOwnProperty(d)&&(a[d]=b[d]);return a},cloneOf=function(a){if(null==a||"object"!=typeof a)return a;var b=a.constructor(),c;for(c in a)a.hasOwnProperty(c)&&(b[c]=cloneOf(a[c]));return b};
window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a,b){window.setTimeout(a,1E3/60)}}();