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function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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magna

remix of d/7511 by u/magna

function u(t) {

c.width=960
for(j=60;j--;)for(i=240;i--;x.fillRect(i*4,j*9,4,9))x.fillStyle=`hsl(${120*i},99%,${S(Math.atan2(40-i/3|0,j-30)+C(t*3)*9)*50}%)`

Mar 29 2018 5:09 AM UTC

}// 140/140

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#crt

u/magna

#rgb

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magna

remix of d/7457 by u/magna

function u(t) {

c.width=960
for(j=60;j--;)for(i=240;i--;x.fillRect(i*4,j*9,4,9))x.fillStyle=`hsl(${120*i},99%,${S(i+t*j)*50}%)`

Mar 27 2018 1:09 AM UTC

}// 111/140

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u/joeytwiddle

Reminds me of putting my head right up to the CRT screen
u/magna

#crt
u/magna

#rgb

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p01

remix of d/7215 by u/jylikangas

function u(t) {

for(c.width=i=W=99;i--;)for(j=W;j--;)x.fillRect(i,j,2/(d=700/j),~(d*i/W+C(t)&d+t*9&7)/d*W)

Mar 14 2018 10:16 PM UTC

}// 90/140

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SPEED RUNNING IN GHOST LAND

Show more comments…
u/jylikangas

For 81byte slow running version lose the subtle camera waving, drop multiplication from t and the last AND operation from height function :)
u/p01

That makes it 77bytes if use a single for loop with a width of 64 and increment of 1/64 ;)
u/Batrachus

Someone should use this for a black metal video. Even the resolution is perfect.
u/magna

hehe: https://dweetplayer.net/demo/v1/*/7338Tfb/ht…
u/jylikangas

:D
u/p01

Hey it does work with black metal ^____^
u/alien

wow

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magna

remix of d/7283 by u/magna

function u(t) {

c.width|=0;for(j=n=10;--j;)for(i=100;i--;X=i%5+j*n+S(t)*30,Y=i/5|0,x.fillRect(400+X*n,400+Y*n+Y**(S(t/j)**n*2),n,n));

Mar 11 2018 7:18 AM UTC

}// 117/140

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keithclark

function u(t) {

with(x)for(c.width=L=a=255,globalCompositeOperation='exclusion';a-=5;arc(v=S(G+=t)*90+L/2,v/2,a,~beginPath(fill()),6))fillStyle=R(L,G=a%2*L)

Mar 7 2018 5:56 PM UTC

}// 140/140

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I was hoping for a more interesting vertical path but couldn't find enough bytes.

u/AnnanFay

S(G+t) saves a character.
u/keithclark

Thanks - that was left over from a previous optimisation for computing a different Y offset

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anilalur

remix of d/7068 by u/anilalur

function u(t) {

v=(a,b,g,r)=>{for(i=0;i++<r;)x.fillRect(a+=S(C(g)),b-=S(g),r/9,2)
r>1?v(a,b,g+=o,r*=.7)&v(a,b,g+=5,r):0}
o=t/9+1;
c.width=500
v(25,280,0,80)

Feb 24 2018 5:09 PM UTC

}// 140/140

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DirtyDan

remix of d/7053 by u/DirtyDan

function u(t) {

with(x)for(i=32;i-->0;)fillStyle=`hsla(${99*t+i*9},100%,50%,.01)`,beginPath(arc(S(t)*960+960+C(t)*i,540,i*(1+S(t)*C(t))*16,0,7),fill())

Feb 23 2018 6:34 AM UTC

}// 135/140

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u/aleamb

nice!
u/DirtyDan

Don't know what I was thinking having "+960+C(t)*i" in the first arc parameter -_- ... 11 extra characters!
u/DirtyDan

nvm, the +960 was necessary, not the "+C(t)*i"... 7 extra characters.
u/Purpzie

This is so beautiful.

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Agnes

function u(t) {

w=c.width+=i=0;for(;i<w;q=i/w,x.fillStyle=R(i*q,i**2,255*i**3,i**4),x.fillRect(w*.5*(1+q*S(t*q)*C(t+i)),540*(1+q*S(q*t+i)),25*q,25*q),i++);

Feb 16 2018 10:17 AM UTC

}// 139/140

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u/fons

Milky Way

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bschwb

function u(t) {

c.width|=0
x.lineWidth=850
for(i=1;i<9;i++)m=0.5*i*t,x.beginPath(),x.strokeStyle=`hsl(${i*20},50%,50%)`,x.arc(960,540,90,m,m+0.2),x.stroke()

Feb 10 2018 10:18 PM UTC

}// 140/140

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magna

function u(t) {

for(c.width|=i=9;i--;)x.fillStyle=`hsl(${i*40},100%,50%`,a=(S(t*9+i)+1)*5,x.fillRect(400+i*100+S(t)*300-a,400+a*3,50+a*2,200-a*3)

Feb 7 2018 4:28 PM UTC

}// 129/140

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#default

u/joeytwiddle

#rainbow #default