function randomInt(a,b){return Math.floor(Math.random()*(b-a+1)+a)}var canvas=document.createElement("canvas"),ctx=canvas.getContext("2d");document.getElementById("canvasContainer").appendChild(canvas);var width=window.innerWidth,height=window.innerHeight;canvas.width=width,canvas.height=height;function clearCanvas(){ctx.fillStyle="#000",ctx.fillRect(0,0,width,height)}clearCanvas();for(var node,t=0,colors=["#4f91f9","#a7f94f","#f94f4f","#f9f74f","#8930ff","#fc4edf","#ff9c51"],nodeSize=3.5,speed=1.5,nodeAmount=150,nodes=[],lineWidth=1,nodePositionArray=[],drawLineThreshold=170,i=0;i<nodeAmount;i++)node=new Node(randomInt(0,width),randomInt(0,height),i),nodes.push(node);function circle(a,b,c){ctx.beginPath(),ctx.arc(a,b,c,0,2*Math.PI),ctx.closePath()}function line(a,b,c,d){ctx.lineWidth=lineWidth,ctx.beginPath(),ctx.moveTo(a,b),ctx.lineTo(c,d),ctx.stroke()}function distance(a,b,c,d){var e=b-a,f=d-c;return Math.sqrt(e*e+f*f)}function map_range(a,b,c,d,e){return d+(e-d)*(a-b)/(c-b)}function isEven(a){return a==parseFloat(a)?!(a%2):void 0}function hexToRgb(a){var b=/^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(a);return b?{r:parseInt(b[1],16),g:parseInt(b[2],16),b:parseInt(b[3],16)}:null}for(var i=0;i<nodes.length;i++)nodes[i].move(),nodes[i].draw();function loop(){clearCanvas(),drawLines();for(var a=0;a<nodes.length;a++)nodes[a].move(),nodes[a].draw();requestAnimationFrame(loop),t++}loop();function Node(a,b,c){this.x=a,this.y=b,this.id=c,isEven(c)?(this.speedX=randomInt(1,100)/100+speed,this.speedY=randomInt(1,100)/100+speed):(this.speedX=randomInt(1,100)/100-speed,this.speedY=randomInt(1,100)/100-speed),this.size=nodeSize,this.color=colors[Math.floor(Math.random()*colors.length)],this.move=function(){this.y+=this.speedY,this.x+=this.speedX,(1>this.y||this.y>height-2*nodeSize)&&(this.speedY=-this.speedY),(1>this.x||this.x>width-2*nodeSize)&&(this.speedX=-this.speedX),nodePositionArray[this.id]=[this.x,this.y,this.color]},this.draw=function(){ctx.fillStyle=this.color,circle(this.x,this.y,nodeSize),ctx.fill()}}function drawLines(){for(var a=0;a<nodePositionArray.length-1;a++)for(var b=nodePositionArray[a][0],c=nodePositionArray[a][1],d=0;d<nodePositionArray.length-(a+1);d++){var e=nodePositionArray[d+a+1][0],f=nodePositionArray[d+a+1][1],g=distance(b,e,c,f);if(g<drawLineThreshold){var h=map_range(g,0,drawLineThreshold,1,0),k=hexToRgb(nodePositionArray[a][2]),l="rgba("+k.r+","+k.g+","+k.b+","+h+")";ctx.strokeStyle=l,line(b,c,e,f)}}}window.addEventListener("resize",function(){width=window.innerWidth,height=window.innerHeight,canvas.width=width,canvas.height=height,clearCanvas(),nodes=[];for(var a,b=0;b<nodeAmount;b++)a=new Node(randomInt(0,width),randomInt(0,height),b),nodes.push(a);for(var b=0;b<nodes.length;b++)nodes[b].move(),nodes[b].draw()});