JS1k: The JavaScript code golfing competition

W=c.width=800;H=c.height=600;S="fillStyle";T="fillText";L="length";M=Math;R=M.random;C=M.ceil;J=10;U=20;P="push";var d=9*H,e=1,j=[];a.strokeStyle="#fff";a.lineWidth=3;for(var k=0;k<d;k++)j[P](new l(H));onkeydown=function(b){b=b.keyCode;b==37&&e--;b==39&&e++;if(b==38)d+=J;if(b==40&&d>J)d-=J};function l(b){this.b=R()*b;this.a=R()*W+1;this.c=R()+1;this.e=R()*3;this.f=R()*(H/3);this.d=R()+1}setInterval(function(){var b=W,f=H;a[S]="#000";for(a.fillRect(0,0,b,f);j[L]!=d;)if(j[L]>d)j.pop();else j[L]<d&&j[P](new l(H));b=W/2;f=H/2;var g=250,h=W/2-H/U,i=H-H/J,m=H/J,n=H/J;a[S]="#630";a.fillRect(h,i,m,n);a[S]="#080";for(h=0;h<5;h++){with(a){beginPath();moveTo(b-g*0.8,f+g);lineTo(b,f);lineTo(b+g*0.8,f+g);fill();stroke()}g/=2;f-=g*0.6}for(b=0;b<j[L];b++){i=j[b].d;f=j[b].a+j[b].e*M.sin(j[b].f+j[b].b/U);g=j[b].b;i=h=i;a[S]="#fff";a.fillRect(f,g,h,i);j[b].b+=j[b].c;j[b].a+=e;if(j[b].a>W)j[b].a-=W;if(j[b].a<0)j[b].a+=W;if(j[b].b>H)j[b]=new l(-9)}a[S]="#080";a.font="18pt Arial";a[T]("Flakes:"+d,U,U);a[T]("Wind:"+e,U,50)},33);

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

W=c.width=800;
H=c.height=600;
S='fillStyle';
T='fillText';
L='length';
M = Math;
R = M.random;
C = M.ceil;
J=10;
U=20;
P='push';

var count = 9*H;
var wind = 1;
var particles = [];

a.strokeStyle = '#fff';
a.lineWidth = 3;

for(var i=0;i < count;i++){
	particles[P](new Flake(H));
}

function DrawRect(x,y,w,h,c){
	if(c)a[S]=c;
	else a[S]='#000';
	a.fillRect(x,y,w,h);
}

onkeydown=function(e){
	var k = e.keyCode;
	if(k==37) wind--;
	if(k==39) wind++;
	if(k==38) count+=J;
	if(k==40&&count>J) count-=J;
}

function DrawTree(){ 
	var x = W/2;
	var y = H/2;
	var offset = 250;
	DrawRect(W/2-H/U,H-H/J,H/J,H/J,'#630');
	a[S]='#080';
	for(var i = 0;i<5;i++)
	{
		with(a)
		{
			beginPath();
			moveTo(x-offset*.8,y+offset);
			lineTo(x,y);
			lineTo(x+offset*.8,y+offset);
			fill();
			stroke();
		}
		offset = offset / 2;
		y = y-(offset*.6);
	}
}

function HandleAndDrawParticles(){
	for(var i=0;i<particles[L];i++)	{
		var size = particles[i].Size;
		var x = particles[i].X+particles[i].Swirve*M.sin((particles[i].SwirveOffset + particles[i].Y/U));
		var y = particles[i].Y;
		DrawRect(x,y,size,size,'#fff');
		particles[i].Y += particles[i].FallSpeed;
		particles[i].X += wind;
		if(particles[i].X > W)
			particles[i].X -= W;
		if(particles[i].X < 0)
			particles[i].X +=W;
		if(particles[i].Y > H)
			particles[i] = new Flake(-9);	
	}	
}

function Loop(){
	DrawRect(0,0,W,H);
	
	while(particles[L] != count)	{
		if(particles[L] > count)
			particles.pop();
		else if(particles[L] < count)
			particles[P](new Flake(H));
	}	
	DrawTree();
	HandleAndDrawParticles();
	a[S]='#080';
	a.font='18pt Arial';
	a[T]('Flakes:' + count, U,U);
	a[T]('Wind:' + wind, U,50);
}

function Flake(MaxY){
	this.Y = R()*MaxY;
	this.X = R()*W+1;
	this.FallSpeed = R()+1;
	this.Swirve = R()*3;
	this.SwirveOffset = R()*(H/3);
	this.Size = R()+1;
}

setInterval(Loop, 33);