playing w/canvas >> logo/snake generative animation

BBsnakeLogo.js

/* Author: Branger_Briz
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                                       \###/   
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*/
    
        var width, height, ctx;
        var x, y;
		var angle, spread, bool, opaci;
		var intervalCir, intervalBool, intervalReset, intervalOpac;
	
		//----------- SETUP --------------
		    function setup() {
				var canvas = document.createElement('canvas');
				document.body.appendChild(canvas);
				width = window.innerWidth,
				height = window.innerHeight,
				canvas.height = height;
				canvas.width = width;
				ctx = canvas.getContext('2d');
				canvas.style.position = 'absolute';
				canvas.style.left = '0px';
				canvas.style.top = '0px';
				canvas.style.zIndex = '0';
				
				x = width/2; y = height/2; s = 25;
		        angle = 0;
				opaci = 0.5;
		        
		        intervalCir = setInterval(drawCir, 1000/40);
		        intervalBool = setInterval(bool, 1000);
				intervalReset = setInterval(resetAngle, 10000);
				intervalOpac = setInterval(opac, 2000);
        }        
	
		//----------- circle --------------
		function circle(x,y,s) {
		    ctx.strokeStyle = "#000";
		    ctx.fillStyle = "rgba(228, 63, 139, "+opaci+")";
		    ctx.beginPath();
		    ctx.arc(x,y,s,0,Math.PI*2,true); 
		    ctx.stroke();
		    ctx.fill();
		    ctx.fillStyle = "#fff";
		    ctx.fillRect(x-9,y-11,22,5);
			ctx.fillRect(x-14,y-2,27,5);
			ctx.fillRect(x-14,y+7,27,5);
			ctx.fillRect(x-9,y-8,5,7);
			ctx.fillRect(x+8,y-8,5,7);
			ctx.fillRect(x-14,y+1,5,7);
			ctx.fillRect(x+8,y+1,5,7);
		}
				
		//----------- functionz --------------
		function bool() { bool = Math.random()*2;}
		function resetAngle() { angle = 0; }
		function opac() { opaci = Math.random()*1; }
	        
		
		
		//----------- DALE BRO-DEEER!! --------------
	    function drawCir() {

	    	if(bool>1){ s+= .2;}else{s-=.2;}
	    	if(s>35) { s = 25; }
	    	if(s<25) { s = 25;}

	        ctx.fillStyle = "rgba(241,241,241,0.0)";  
	        ctx.fillRect (0, 0, width, height);
		    	    
		    angle += .1; spread = 1;
	        xC = spread * angle * Math.cos(angle);
	        yC = spread * angle * Math.sin(angle);
		    if (bool > 1) {
				angle -= .2;
		    }
		    
		    circle(x+=xC,y+=yC,s);		
	    }
		

			
	        width = window.innerWidth;
	        height = window.innerHeight;

	    
		setup();

Ey! I just try and its very Cool! I have a question, ¿How i draw several worms? THX!