snowflake.js

function setup()
{ 
  createCanvas(700, 400);
  background(255);
} 

var deg60 = Math.PI/3;

function addVector(x,y,angle,length)
{
	return [x + length*Math.cos(angle), y + length*Math.sin(angle)];
}

function drawSide(x,y,angle,length,level)
{
	if (level == 0)
	{
		var [x2, y2] = addVector(x,y,angle,length);
		line(x,y,x2,y2);
	}
	else
	{
		length /= 3;
		level -= 1;
		
		drawSide(x,y,angle,length,level);
		
		[x,y] = addVector(x,y,angle,length);
		angle -= deg60;
		drawSide(x,y,angle,length,level);
		
		[x,y] = addVector(x,y,angle,length);
		angle += 2*deg60;
		drawSide(x,y,angle,length,level);
		
		[x,y] = addVector(x,y,angle,length);
		angle -= deg60;
		drawSide(x,y,angle,length,level);
	}
}

var t = 0;
function draw() 
{ 
	background(255);
	
	var mx = 350;
	var my = 200;
	var length = 300;
	var level = 5 - Math.abs(Math.floor(t*10) % 10 - 5);
	
	var [x,y] = addVector(mx,my,t - 2.5*deg60,length / Math.sqrt(3));
	drawSide(x,y,t,length,level);
	
	[x,y] = addVector(x,y,t,length);
	var angle = t + 2*deg60;
	drawSide(x,y,angle,length,level);

	[x,y] = addVector(x,y,angle,length);
	angle += 2*deg60;
	drawSide(x,y,angle,length,level);
		
	t += 0.003;
}