/*!
* Particleground
*
* @author Jonathan Nicol - @mrjnicol
* @version 1.1.0
* @description Creates a canvas based particle system background
*
* Inspired by http://requestlab.fr/ and http://disruptivebydesign.com/
*/
;(function(window,document){"use strict";var pluginName='particleground';function extend(out){out=out||{};for(var i=1;i<arguments.length;i++){var obj=arguments[i];if(!obj)continue;for(var key in obj){if(obj.hasOwnProperty(key)){if(typeof obj[key]==='object')
deepExtend(out[key],obj[key]);else
out[key]=obj[key];}}}
return out;};var $=window.jQuery;function Plugin(element,options){var canvasSupport=!!document.createElement('canvas').getContext;var canvas;var ctx;var particles=[];var raf;var mouseX=0;var mouseY=0;var winW;var winH;var desktop=!navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry|BB10|mobi|tablet|opera mini|nexus 7)/i);var orientationSupport=!!window.DeviceOrientationEvent;var tiltX=0;var pointerX;var pointerY;var tiltY=0;var paused=false;options=extend({},window[pluginName].defaults,options);function init(){if(!canvasSupport){return;}
canvas=document.createElement('canvas');canvas.className='pg-canvas';canvas.style.display='block';element.insertBefore(canvas,element.firstChild);ctx=canvas.getContext('2d');styleCanvas();var numParticles=Math.round((canvas.width*canvas.height)/ options.density);for(var i=0;i<numParticles;i++){var p=new Particle();p.setStackPos(i);particles.push(p);};window.addEventListener('resize',function(){resizeHandler();},false);document.addEventListener('mousemove',function(e){mouseX=e.pageX;mouseY=e.pageY;},false);if(orientationSupport&&!desktop){window.addEventListener('deviceorientation',function(){tiltY=Math.min(Math.max(-event.beta,-30),30);tiltX=Math.min(Math.max(-event.gamma,-30),30);},true);}
draw();hook('onInit');}
function styleCanvas(){canvas.width=element.offsetWidth;canvas.height=element.offsetHeight;ctx.fillStyle=options.dotColor;ctx.strokeStyle=options.lineColor;ctx.lineWidth=options.lineWidth;}
function draw(){if(!canvasSupport){return;}
winW=window.innerWidth;winH=window.innerHeight;ctx.clearRect(0,0,canvas.width,canvas.height);for(var i=0;i<particles.length;i++){particles[i].updatePosition();};for(var i=0;i<particles.length;i++){particles[i].draw();};if(!paused){raf=requestAnimationFrame(draw);}}
function resizeHandler(){styleCanvas();var elWidth=element.offsetWidth;var elHeight=element.offsetHeight;for(var i=particles.length-1;i>=0;i--){if(particles[i].position.x>elWidth||particles[i].position.y>elHeight){particles.splice(i,1);}};var numParticles=Math.round((canvas.width*canvas.height)/ options.density);if(numParticles>particles.length){while(numParticles>particles.length){var p=new Particle();particles.push(p);}}else if(numParticles<particles.length){particles.splice(numParticles);}
for(i=particles.length-1;i>=0;i--){particles[i].setStackPos(i);};}
function pause(){paused=true;}
function start(){paused=false;draw();}
function Particle(){this.stackPos;this.active=true;this.layer=Math.ceil(Math.random()*3);this.parallaxOffsetX=0;this.parallaxOffsetY=0;this.position={x:Math.ceil(Math.random()*canvas.width),y:Math.ceil(Math.random()*canvas.height)}
this.speed={}
switch(options.directionX){case'left':this.speed.x=+(-options.maxSpeedX+(Math.random()*options.maxSpeedX)-options.minSpeedX).toFixed(2);break;case'right':this.speed.x=+((Math.random()*options.maxSpeedX)+options.minSpeedX).toFixed(2);break;default:this.speed.x=+((-options.maxSpeedX / 2)+(Math.random()*options.maxSpeedX)).toFixed(2);this.speed.x+=this.speed.x>0?options.minSpeedX:-options.minSpeedX;break;}
switch(options.directionY){case'up':this.speed.y=+(-options.maxSpeedY+(Math.random()*options.maxSpeedY)-options.minSpeedY).toFixed(2);break;case'down':this.speed.y=+((Math.random()*options.maxSpeedY)+options.minSpeedY).toFixed(2);break;default:this.speed.y=+((-options.maxSpeedY / 2)+(Math.random()*options.maxSpeedY)).toFixed(2);this.speed.x+=this.speed.y>0?options.minSpeedY:-options.minSpeedY;break;}}
Particle.prototype.draw=function(){ctx.beginPath();ctx.arc(this.position.x+this.parallaxOffsetX,this.position.y+this.parallaxOffsetY,options.particleRadius / 2,0,Math.PI*2,true);ctx.closePath();ctx.fill();ctx.beginPath();for(var i=particles.length-1;i>this.stackPos;i--){var p2=particles[i];var a=this.position.x-p2.position.x
var b=this.position.y-p2.position.y
var dist=Math.sqrt((a*a)+(b*b)).toFixed(2);if(dist<options.proximity){ctx.moveTo(this.position.x+this.parallaxOffsetX,this.position.y+this.parallaxOffsetY);if(options.curvedLines){ctx.quadraticCurveTo(Math.max(p2.position.x,p2.position.x),Math.min(p2.position.y,p2.position.y),p2.position.x+p2.parallaxOffsetX,p2.position.y+p2.parallaxOffsetY);}else{ctx.lineTo(p2.position.x+p2.parallaxOffsetX,p2.position.y+p2.parallaxOffsetY);}}}
ctx.stroke();ctx.closePath();}
Particle.prototype.updatePosition=function(){if(options.parallax){if(orientationSupport&&!desktop){var ratioX=(winW-0)/(30- -30);pointerX=(tiltX- -30)*ratioX+0;var ratioY=(winH-0)/(30- -30);pointerY=(tiltY- -30)*ratioY+0;}else{pointerX=mouseX;pointerY=mouseY;}
this.parallaxTargX=(pointerX-(winW / 2))/(options.parallaxMultiplier*this.layer);this.parallaxOffsetX+=(this.parallaxTargX-this.parallaxOffsetX)/ 10;this.parallaxTargY=(pointerY-(winH / 2))/(options.parallaxMultiplier*this.layer);this.parallaxOffsetY+=(this.parallaxTargY-this.parallaxOffsetY)/ 10;}
var elWidth=element.offsetWidth;var elHeight=element.offsetHeight;switch(options.directionX){case'left':if(this.position.x+this.speed.x+this.parallaxOffsetX<0){this.position.x=elWidth-this.parallaxOffsetX;}
break;case'right':if(this.position.x+this.speed.x+this.parallaxOffsetX>elWidth){this.position.x=0-this.parallaxOffsetX;}
break;default:if(this.position.x+this.speed.x+this.parallaxOffsetX>elWidth||this.position.x+this.speed.x+this.parallaxOffsetX<0){this.speed.x=-this.speed.x;}
break;}
switch(options.directionY){case'up':if(this.position.y+this.speed.y+this.parallaxOffsetY<0){this.position.y=elHeight-this.parallaxOffsetY;}
break;case'down':if(this.position.y+this.speed.y+this.parallaxOffsetY>elHeight){this.position.y=0-this.parallaxOffsetY;}
break;default:if(this.position.y+this.speed.y+this.parallaxOffsetY>elHeight||this.position.y+this.speed.y+this.parallaxOffsetY<0){this.speed.y=-this.speed.y;}
break;}
this.position.x+=this.speed.x;this.position.y+=this.speed.y;}
Particle.prototype.setStackPos=function(i){this.stackPos=i;}
function option(key,val){if(val){options[key]=val;}else{return options[key];}}
function destroy(){console.log('destroy');canvas.parentNode.removeChild(canvas);hook('onDestroy');if($){$(element).removeData('plugin_'+pluginName);}}
function hook(hookName){if(options[hookName]!==undefined){options[hookName].call(element);}}
init();return{option:option,destroy:destroy,start:start,pause:pause};}
window[pluginName]=function(elem,options){return new Plugin(elem,options);};window[pluginName].defaults={minSpeedX:0.1,maxSpeedX:0.7,minSpeedY:0.1,maxSpeedY:0.7,directionX:'center',directionY:'center',density:10000,dotColor:'#666666',lineColor:'#666666',particleRadius:7,lineWidth:1,curvedLines:false,proximity:100,parallax:true,parallaxMultiplier:5,onInit:function(){},onDestroy:function(){}};if($){$.fn[pluginName]=function(options){if(typeof arguments[0]==='string'){var methodName=arguments[0];var args=Array.prototype.slice.call(arguments,1);var returnVal;this.each(function(){if($.data(this,'plugin_'+pluginName)&&typeof $.data(this,'plugin_'+pluginName)[methodName]==='function'){returnVal=$.data(this,'plugin_'+pluginName)[methodName].apply(this,args);}});if(returnVal!==undefined){return returnVal;}else{return this;}}else if(typeof options==="object"||!options){return this.each(function(){if(!$.data(this,'plugin_'+pluginName)){$.data(this,'plugin_'+pluginName,new Plugin(this,options));}});}};}})(window,document);(function(){var lastTime=0;var vendors=['ms','moz','webkit','o'];for(var x=0;x<vendors.length&&!window.requestAnimationFrame;++x){window.requestAnimationFrame=window[vendors[x]+'RequestAnimationFrame'];window.cancelAnimationFrame=window[vendors[x]+'CancelAnimationFrame']||window[vendors[x]+'CancelRequestAnimationFrame'];}
if(!window.requestAnimationFrame)
window.requestAnimationFrame=function(callback,element){var currTime=new Date().getTime();var timeToCall=Math.max(0,16-(currTime-lastTime));var id=window.setTimeout(function(){callback(currTime+timeToCall);},timeToCall);lastTime=currTime+timeToCall;return id;};if(!window.cancelAnimationFrame)
window.cancelAnimationFrame=function(id){clearTimeout(id);};}());
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