JS1k: The JavaScript code golfing competition

P=devicePixelRatio
D=[]
M=Math
R=M.random
I=M.min
A=M.max
a.width=W=X=P*a.clientWidth
a.height=H=P*a.clientHeight
S=o=>c.fillStyle=o
F=(x,w,f,g)=>c.fillRect(x,f,-w,g-f)
C=(f,g,h,i,j,k)=>{S((f<g)?'#090':'red');F(X-2,1,h,j);F(X-2,1,i,k);F(X,5,f,g);X-=9}
T=y=>c.translate(0,y)
f=9
setInterval(o=>{
g=f*(0.2*R()+0.9)
h=I(f,g)
i=A(f,g)
j=h*(0.05*R()+0.95)
k=i*(0.05*R()+1)
D.unshift([f,g,h,i,j,k])
D.length=99*P
f=g
z=D.reduce((w,v)=>A(w,...v),0)
q=D.reduce((w,v)=>I(w,...v),z)
c.resetTransform()
S('white')
F(W,W,0,H)
T(H)
c.scale(1,H/(q-z))
T(-q)
X=W
D.forEach(v=>C(...v))},99)

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