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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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BuRRak

remix of d/7796 by u/BuRRak

function u(t) {

for(i=c.width=99;i--;)for(j=56;j--;)x.fillRect(i,j,S(i/j+t*60/32)*0.5+0.5,1)

Apr 25 2018 4:06 PM UTC

}// 76/140

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Why does this look 3d to me

u/BalintCsala

Parallax scrolling probably

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BuRRak

function u(t) {

for(i=c.width=99;i--;)for(j=56;j--;)x.fillRect(i,j,S(i*j+frame/32)*0.5+0.5,1)

Apr 25 2018 3:56 PM UTC

}// 77/140

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Inspired by Neon City @jylikangas

u/BuRRak

I could save 4 bytes by using t*60 instead of frame and removing the 0 in decimal numbers but whatever
u/BalintCsala

x*.5 is x/2

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function u(t) {

c.width=1920;x.font='120px Arial';
for(i=0;i<190;i++)
x.fillText('jf',i*10,200+S(t)*300+S(i*2+t*2)*200+400);

Apr 25 2018 2:06 PM UTC

}// 108/140

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u/BuRRak

Coool

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function u(t) {

T=t%3
cx=c.width/4
cy=c.height/4
x.ellipse(cx, cy, T*cx/2, T*cy, t, t,0.9)
x.stroke()

Apr 25 2018 1:54 PM UTC

}// 86/140

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lcfrdvx

function u(t) {

c.width=1920
c.onmousemove=e=>m=e
n=9999
for(i=0;i<n;i++)x.fillRect(c.width/n*i,520+(S(t+i*C(m.x))*200)+(S(t+i*C(m.y))*200),9,9)

Apr 25 2018 12:59 PM UTC

}// 128/140

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#interactive

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lcfrdvx

remix of d/7780 by u/lcfrdvx

function u(t) {

l=200;for(i=0;i<l;i++){x.fillStyle=`hsl(${t*100},90%,60%)`;a=(Math.PI*19/l)*i;x.fillRect(960+C(a+t)*400,540+S(a+t)*C(a*2)*400,10,10)}

Apr 25 2018 11:50 AM UTC

}// 133/140

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#colors

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Agnes

function u(t) {

for(w=c.width|=i=9;i--;)x.rect(400+i*100+S(t)*300,400,50,200);x.clip();for(i=1e3,A=Math.random;i--;x.arc(w*A(),1080*A(),3*A(),0,7));x.fill()

Apr 25 2018 9:40 AM UTC

}// 140/140

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Noisy default

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function u(t) {

p=800+C(t*5)*t*11
q=500+S(t*3)*t*6
x.arc(p, q, 5, 0, Math.PI * 2, true)
x.stroke()

Apr 25 2018 9:32 AM UTC

}// 84/140

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lcfrdvx

function u(t) {

for(i=0;i<60;i++){x.setTransform(1,0,C(t*0.5%Math.PI),1,0,C(i+t*10)*10);x.fillStyle=`hsl(${t*10},90%,60%)`;x.fillRect(860,300+i*10,10,10)}

Apr 25 2018 8:38 AM UTC

}// 138/140

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Barth

function u(t) {

c.onmousemove=e=>m=e
x.font="200px Arial";x.fillText("•",m.x*3.379-79/2,m.y*3.379+150/2);x.fillStyle=`hsl(${t*250},100%,75%`

Apr 25 2018 8:37 AM UTC

}// 124/140

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#draw #paint

u/lionleaf

#interactive #colors