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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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Current theme challenge: #Food

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taupelink

function u(t) {

f=a=>S(a*S(X+S(Y+S(a))))*i;for(r=Math.random,i=k=256;i--;x.fillRect(k*X,k*Y,i/t,i/t))X=r(Y=r()*5)*9,x.fillStyle=R(f(h=3+X*Y),f(h+X),f(h+Y))

Nov 25 2020 9:22 PM UTC

}// 139/140

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d/20808

u/taupelink

Work in progress--kind of an aurora effect
u/geb

looks like a glsl shader demo :) very nice!

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geb

remix of d/20799 by u/geb

function u(t) {

for(i=3e3,c.width|=f=g=>t+99*(t|1<<g(i)+g(2*i+t))*g(V=(i/5)+t);i--;)x.arc(960+f(C),540+f(S),9,0,1);x.stroke(),c.style='filter:invert('

Nov 25 2020 10:56 AM UTC

}// 134/140

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u/magna

Stylish!

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Irratix

remix of d/20789 by u/ciaccodavide

function u(t) {

onmousemove=e=>T=e.x
L=(f,v,o)=>x[f](960+C(v+o)*r,530+S(v)*r)
for(c.width|=r=i=300;i--;L('lineTo',g*3,0))L('moveTo',g=t*i/r,T/50)
x.stroke()

Nov 23 2020 6:42 PM UTC

}// 140/140

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wanted to see if i could fit it in an uncompressed dweet without changing functionality.

u/ciaccodavide

Nice!

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ciaccodavide

remix of d/20788 by u/ciaccodavide

function u(t) {

eval(unescape(escape`𣀽𚁦𛁶𛁯𚐽🡸𦱦𧐨𞐶𜀫𠰨𭠫𫰩𚡲𛀵𜰰𚱓𚁶𚐪𬠩𒡦𫱲𚁯𫡭𫱵𬱥𫑯𭡥👥🐾𥀽𩐮𮀬𨰮𭱩𩁴𪁼👲👩🐳𜀰𞱩𛐭𞰩𣀨𙱭𫱶𩑔𫰧𛁴𚡩𛰱𜀰𛀰𚐬𣀨𙱬𪑮𩑔𫰧𛁴𚡩𛰳𜀰𛁔𛰵𜀩𒡸𛡳𭁲𫱫𩐨𚐠`.replace(/u../g,'')))

Nov 23 2020 12:29 PM UTC

}// 116/140

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Loading saturn 3D #interactive

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Irratix

remix of d/20727 by u/Irratix

function u(t) {

d=new Date()
x.fillText([...'🕛🕐🕑🕒🕓🕔🕕🕖🕗🕘🕙🕚🕧🕜🕝🕞🕟🕠🕡🕢🕣🕤🕥🕦'][d.getHours(x.font="9em'")%12+(d.getMinutes()>29&&12)],0,133)
throw d

Nov 20 2020 3:20 PM UTC

}// 124/140

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and shorter

u/ciaccodavide

Nice!
u/Xen

love it

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ciaccodavide

remix of d/20723 by u/ciaccodavide

function u(t) {

K='🕛🕐🕑🕒🕓🕔🕕🕖🕗🕘🕙🕚🕧🕜🕝🕞🕟🕠🕡🕢🕣🕤🕥🕦'
m=(d=new Date()).getMinutes(h=d.getHours(x.font="9em'"))>29&&24
x.fillText(K.substr(h%12*2+m,2),0,133)
throw(d)

Nov 20 2020 2:19 PM UTC

}// 140/140

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Real time #emoji #clock that throws the date #golfed

u/ciaccodavide

Golfing that throw(d) into d/20723 felt good

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danny@hille.dk

remix of d/20689 by u/yonatan

function u(t) {

q=c.width=99;for(m=20;m--;)for(n=i=q;i--;x.fillRect(i,a*(25-m),2,q,x.fillStyle=R(m*9)))for(a=j=3;j--;a+=S(((t/m*q+i)*S(m*k))*k/9)/k)k=4**j

Nov 18 2020 7:25 PM UTC

}// 139/140

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golf and play

u/danny@hille.dk

-2 bytes -> q=c.width=99;for(m=20;m--;)for(n=i=q;i--;x.fillRect(i,a*(25-m),2,q,x.fillStyle=R(m*9)))for(a=j=3;j--;a+=S((t/m*q+i)*S(m*k)*k/9)/k)k=4**j*

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plusright

function u(t) {

c.width=1980;r=200;n=20;x.fillStyle=R(0,0,0,0.8);for(j=n;j--;)for(i=n;i--;x.fillRect(r+r*S(i+t)*j/2,T(t/j)*r+r*C(i+t)*j/2,r-i*j,r-i*j));

Nov 16 2020 6:41 PM UTC

}// 137/140

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#corruption #asymmetry

u/plusright

adding color is difficult! I want to do more with it but can't beat the character count.
u/Xen

few more bytes for you... c.width|=r=200;for(j=20;j--;x.fillStyle=R(0,0,0,.8))for(i=20;i--;)x.fillRect(r+r*S(i+t)*j/2,T(t/j)*r+r*C(i+t)*j/2,z=r-i*j,z)
u/pavel

x.fillStyle=R(0,0,0,.8) -> x.globalAlpha=.8
u/plusright

nice, thank you both.

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plusright

function u(t) {

c.width=999;w=40;a=16
for(i=0;i<a;i++){for(j=0;j<a;j++){s=i%2==0?-1:1
x.fillRect(-2*w+i*2*w+S(t)*w+C(t)*-s*w,-2*w+j*2*w+(C(t)*w*s),w,w)}}

Nov 15 2020 8:26 AM UTC

}// 137/140

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possibly #symmetry

u/plusright

gotta find a more succinct way of writing for loops, this one just feels a little too dull
u/yonatan

c.width=999 for(w=i=40;i--;)for(j=16;j--;)s=i%2==0?-1:1,x.fillRect(-2*w+i*2*w+S(t)*w+C(t)*-s*w,-2*w+j*2*w+(C(t)*w*s),w,w)
u/yonatan

actually, the fillRect can go into the for loop's final expression, between the ; and the ) to save 2 more chars
u/plusright

aha! that's clever, thanks.

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yonatan

function u(t) {

c.width=c.height=t?2e3:9
t?x.fillRect(0,0,2e3,2e3,x.fillStyle=p,x.scale(s=9+S(t)*8,s)):p=x.createPattern(c,'repeat',x.fillText('A',0,9))

Nov 14 2020 7:35 AM UTC

}// 136/140

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createPattern

u/yonatan

'repeat' can be replaced with ''