JS1k: The JavaScript code golfing competition

for(_='){&functionO", O(e&QmoveQUvarW=0;Zfor(W zzAZA<|ziZi<~)/(r.$atan2#floorHthis.GdpKe[i].JJrxk(k-jK[A].9j9x8ent7li7@;++?if(>cos`;G_le^lb)*(pt)-c.fill.push(RectdrawJry(--r.00;}32.^ngth? = H((e.ca.addEv7Listener("mouse Vert(x,y,vx,vy);touch	Q>e.which==1)=a.widthhangedTouches[0].pagea.heightYtop$bottomtop}.getBoundingC@(mxX^ft$right^ftmy~ei&
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Sty^="hsla("+(2+(.01+jJxjJx)+JyJy))/50)+",1%,45%,.1)";j,-,64,64}requestAnimationFrame(fNo++Ura@@down1up0	startQ=1	endQ=0	Ue.prev7Default(W rc20;1125;fNomxmyp0;e=[];K=[];~/?i&|/?A&x=i*;y=A*;vxZvyZenew,)}}(';G=/[
-^-`>-@7-9jkJKGH#$~|zZWUQO&]/.exec(_);)with(_.split(G))_=join(shift());eval(_)

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var {sin,cos,sqrt,floor,atan2,PI,abs} = Math;

function Vert(x,y,vx,vy){
	this.x = x;
	this.y = y;
	this.rx = x;
	this.ry = y;
	this.vx = vx;
	this.vy = vy;
}

function draw(vars){

	if(lb) dp.push({x:mx,y:my,p:0});
	
	for(var i=0;i<e.length;++i){
		e[i].rx=e[i].x;
		e[i].ry=e[i].y;
	}
	
	for(var j=0;j<dp.length;++j){
		
		for(var i=0;i<e.length;++i){
			d=sqrt((e[i].rx-dp[j].x)*(e[i].rx-dp[j].x)+(e[i].ry-dp[j].y)*(e[i].ry-dp[j].y));
			p=atan2(e[i].rx-dp[j].x,e[i].ry-dp[j].y);
			t=d+cos(PI/2+d/100-dp[j].p/200)*40/(1+abs(dp[j].p/2-d)/20);
			e[i].rx+=(dp[j].x+sin(p)*t)-e[i].rx;
			e[i].ry+=(dp[j].y+cos(p)*t)-e[i].ry;
		}
		if(dp[j].p<1500){
			dp[j].p+=50;
		}else{
			dp.splice(j,1);
		}
	}

	c.clearRect(0, 0, a.width, a.height);
	for(var i=0;i<e.length;++i){
		c.fillStyle="hsla("+(200+(.01+(e[i].rx-e[i].x)*(e[i].rx-e[i].x)+(e[i].ry-e[i].y)*(e[i].ry-e[i].y))/50)+",100%,45%,.1)";
		c.fillRect(e[i].rx-32,e[i].ry-32,64,64);
	}
	
	requestAnimationFrame(draw);
	fNo++;
}

a.addEventListener("mousemove", function(e){
	r = a.getBoundingClientRect();
	mx = floor((e.clientX-r.left)/(r.right-r.left)*a.width);
	my = floor((e.clientY-r.top)/(r.bottom-r.top)*a.height);
});

a.addEventListener("mousedown", function(e){
	if(e.which==1)lb=1;
});

a.addEventListener("mouseup", function(e){
	if(e.which==1)lb=0;
});

a.addEventListener("touchstart", function(e){lb=1;});
a.addEventListener("touchend", function(e){lb=0;});
a.addEventListener("touchmove", function(e){
	e.preventDefault();
	var r = c.getBoundingClientRect();
	mx = floor((e.changedTouches[0].pageX-r.left)/(r.right-r.left)*a.width);
	my = floor((e.changedTouches[0].pageY-r.top)/(r.bottom-r.top)*a.height);
});

a.width = 2000;
a.height = 1125;
fNo = mx = my = lb = p = 0;
e=[];
dp=[];
for(var i=0;i<a.width/32;++i){
	for(var j=0;j<a.height/32;++j){
		x=i*32;
		y=j*32;
		vx=0;
		vy=0;
		e.push(new Vert(x,y,vx,vy,32));
	}
}

draw();