JS1k: The JavaScript code golfing competition

function r(){z=Math,y=z.floor,r=120,i=0;p%=360;0>p&&(p+=360);s=p/60;o=1*(1-z.abs(s%2-1));switch(y(s)){case 0:u=1;f=o;t=0;break;case 1:u=o;f=1;t=0;break;case 2:u=0;f=1;t=o;break;case 3:u=0;f=o;t=1;break;case 4:u=o;f=0;t=1;break;case 5:u=1,f=0,t=o}s=y(255*(u+0));f=y(255*(f+0));o=y(255*(t+0));a.clearRect(0,0,w,h);for(t=1;27>t;t++)a.font=r+"px d",a.save(),a.translate(w/2,h/2),a.rotate(e*t/z.PI),a.lineWidth=2,a.fillStyle="rgba("+s+","+f+","+o+","+i+")",a.fillText("✿",t*j,t*j),a.strokeStyle="rgba(255,255,255,"+i+")",a.strokeText("✿",t*j,t*j),a.restore(),i+=1/26,r-=4;p+=1;e+=.0288;j>.1*(w/26)||j>.1*(h/26)?n=!1:0>j&&(n=!0);j=n?j+.0144:j-.0144}c.width=w=innerWidth;c.height=h=innerHeight;x=b.style;x.margin=0;x.background="#000";e=0,j=0,n=!1,p=1;onload=function(){setInterval(r,50)}

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

c.width = w = window.innerWidth;
c.height = h = window.innerHeight;
b.style.margin = 0;
b.style.background="#000";
var angle = 0,
	offset = 0,
	flag = false,
	hue = 1;
function draw() {
	var i,
		size = 120,
		alpha = 0,
		s = 1,
		v = 1,
		c,
		h1,
		x,
		r1,
		g1,
		b1,
		m,
		red,
		blue,
		green;
	hue %= 360;
	h1 = hue / 60;
	if (hue < 0) {
	    hue += 360;
	}
	c = v * s;
	h1 = hue / 60;
	x = c * (1 - Math.abs(h1 % 2 - 1));
	m = v - c;
	switch (Math.floor(h1)) {
		case 0: r1 = c; g1 = x; b1 = 0; break;
		case 1: r1 = x; g1 = c; b1 = 0; break;
		case 2: r1 = 0; g1 = c; b1 = x; break;
		case 3: r1 = 0; g1 = x; b1 = c; break;
		case 4: r1 = x; g1 = 0; b1 = c; break;
		case 5: r1 = c; g1 = 0; b1 = x; break;
	}
	red = Math.floor((r1 + m) * 255);
	green = Math.floor((g1 + m) * 255);
	blue = Math.floor((b1 + m) * 255);
	a.clearRect(0, 0, w, h);
		for (i = 1; i < 27; i++) {
			a.font = size + 'px arial';
			a.save();
			a.translate(w / 2, h / 2);
			a.rotate(angle * i / Math.PI);
			a.lineWidth = 2;
			a.fillStyle = 'rgba(' + red + ',' + green + ',' + blue + ',' + alpha + ')';
			a.fillText('✿', i * offset, i * offset);
			a.strokeStyle = 'rgba(255,255,255,' + alpha + ')';
			a.strokeText('✿', i * offset, i * offset);
			a.restore();
			alpha += (1 / 26);
			size -= 4;
		}
	hue += 1;
	angle += 0.0288;
	if (offset > w / 26 * 0.1 || offset > h / 26 * 0.1) {
		flag = false;
	} else if (offset < 0) {
		flag = true;
	}
	if (flag) {
		offset += 0.0144;
	} else {
		offset -= 0.0144;
	}
}
window.onload = function () {
	setInterval(draw, 50);
};