JS1k: The JavaScript code golfing competition

_='G{s,s,@,m,r}=Math;J rgb(lGrV+sWGgV+sWGbV-sWreturn "#"IrkIgkIbk;}J (f++;x=@(mx*.16Qy=@(my*.`Zgd[x][y9=lb?10:31=z2=P?i-1:7$93=P<7?i+1:0$94=P$?A-1:7195=P$<71?A+1:09;z=(a1+a2+a3+a4+a5)/5;z/=1.1-(lb?.:0Qz=6}H.075"#0";K0,0,8,6`Zx=6.25*i;y=8.333*Argb(z/2.5+f/18QHQKx,y,6,8}	requestAnimationFrame(&ra_j^&downO1;}Q&upO0Nstart|1Nend|0Ne.prev!Default(QGrc_UjU^=8;=6;mx=my=fgd=new Array(8`P]=[];Z%={};%.a%.lor=1;P].push(%}(Q~a.addEv!Listener("|", J(ezP$9k.toStrg(16) ).slice (-2)jX/(r.right*Qmy>`Qfor(ii<8;++i_.getBgCQmx>^Y/(r.bottom*QZfor(AA<72;++AW(l)*0.5)*256QV@((0.5UhangedTouches[0].pageQ);Pgd[iO|if(e.which==1)N;}Q~touchKc.fillJfunctionI+("0" + Hc.globalAlpha=Gvar @floor>r((e.c9].a&~mouse%tile$][A!entRect(in-r.left)a.height;KStyle=00 = =0;lb=ounddrawa.width-r.top)12m(z,1co){;aQ}li!move|';for(i of'!$%&9>@GHIJKNOPQUVWZ^_`jkz|~')with(_.split(i))_=join(pop());eval(_)

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

var {sin,cos,floor,min,round}=Math;

function rgb(col){

	var r = floor((0.5+sin(col)*0.5)*256);
	var g = floor((0.5+cos(col)*0.5)*256);
	var b = floor((0.5-sin(col)*0.5)*256);
	return "#"+("0" + r.toString(16) ).slice (-2)+("0" + g.toString(16) ).slice (-2)+("0" + b.toString(16) ).slice (-2);
}

function draw(){
	
	f++;
	x=floor(mx*.16);
	y=floor(my*.12);
	for(i=0;i<128;++i){
		for(j=0;j<72;++j){
			gd[x][y].a=lb?100000:3;
			a1=gd[i][j].a;
			a2=gd[i?i-1:127][j].a;
			a3=gd[i<127?i+1:0][j].a;
			a4=gd[i][j?j-1:71].a;
			a5=gd[i][j<71?j+1:0].a;
			gd[i][j].a=(a1+a2+a3+a4+a5)/5;
			gd[i][j].a/=1.1-(lb?.12:0);
			gd[i][j].a=min(gd[i][j].a,16);
		}
	}

	c.globalAlpha=.075;
	c.fillStyle="#000";
	c.fillRect(0,0,800,600);
	
	for(i=0;i<128;++i){
		for(j=0;j<72;++j){
			x=6.25*i;
			y=8.333*j;
			c.fillStyle=rgb(gd[i][j].a/2.5+f/18);
			c.globalAlpha=min(gd[i][j].a,1);
			c.fillRect(x,y,6,8);
		}
	}	
	requestAnimationFrame(draw);
}

a.addEventListener("mousemove", function(e){
	r = a.getBoundingClientRect();
	mx = round((e.clientX-r.left)/(r.right-r.left)*a.width);
	my = round((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 = round((e.changedTouches[0].pageX-r.left)/(r.right-r.left)*a.width);
	my = round((e.changedTouches[0].pageY-r.top)/(r.bottom-r.top)*a.height);
});


/* remove before minifying */ 
	c=a.getContext("2d");
/***************************/

a.width=800;
a.height=600;
mx=my=lb=f=0;

gd=new Array(128);
for(i=0;i<128;++i){
	gd[i]=[];
	for(j=0;j<72;++j){
		tile={};
		tile.a=0;
		tile.color=1;
		gd[i].push(tile);
	}
}
draw();