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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.

Theme challenge of the month: #candy

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Qwitter

function u(t) {

p=t*Math.PI;x.lineTo(z=960,540);t<6&&x.lineTo(z+C(p)*(C(9*p)*25+80)*5,540+S(p)*(S(2*t)+80)*5);t>6&&x.lineTo(640+25*C(t),1045);x.stroke();

Jan 28 2021 5:40 AM UTC

}// 137/140

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taupelink

remix of d/21461 by u/taupelink

function u(t) {

for(i=k=256;i>>=1;x.fillRect(k*X,k*Y,i/4/t,i/t))f=i*t,X=f*f%8,Y=X*f%5,h=C(m=C(q=C(X/4)%C(Y/2)*i)%C(p=S(q)*i)*i)*i,x.fillStyle=R(h*q,h*p,h*m)

Jan 28 2021 3:09 AM UTC

}// 140/140

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d/21478

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Qwitter

function u(t) {

w=c.width=1920;N=128;for(j=9216;j--;){X=(j%N)*15;Y=((j/N)^0)*15;x.fillRect(X+40*C(X/120+C(t/3)*Y/99-9*t),Y+40*S(X/120-7*t),9,9);}

Jan 28 2021 2:55 AM UTC

}// 129/140

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erin

remix of d/21440 by u/erin

function u(t) {

c.width=w=70;for(i=2800;i--;)x.fillRect(X=i%w,Y=i/w,X/9+1*(Y/6.5)+S(X/7-5*t),1),x.fillStyle=`hsla(${U=i/13+S(t+i)*4+w},30%,50%,${T(U)+.5})`

Jan 27 2021 9:20 PM UTC

}// 139/140

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this is supposed to be water in the sun, but i couldn't figure out how to make the color blue instead of rainbow without ruining the shine.. any ideas?

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Qwitter

remix of d/21455 by u/Qwitter

function u(t) {

eval(unescape(escape`𣄽𞄰𞵸𛥦𪕬𫅓𭅹𫅥🔧𘴶𜔲𜔧𞵸𛥦𪕬𫅒𩕣𭄨𜄬𜄬𫔽𜥥𜴬𫔩𞵦𫵲𚅪🔱𜴲𞵪𛔭𞴩𮵧🕌𚤨𜔫𪤯𜔱𧤰𚔫𠴨𭄩𚤱𜄴𞵨🕪𚥍𨕴𪄮𤅉𚤲𛴱𜔫𠴨𩴯𣄭𭄩𛕴𞵸𛥣𫅥𨕲𤥥𨵴𚄹𝤰𚵧𚥃𚅨𚔬𝔴𜄫𜤪𩴪𤴨𪄩𛅧𛴹𛅧𛴳𚕽`.replace(/u../g,'')))

Jan 27 2021 6:21 PM UTC

}// 124/140

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Iris

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jdidion

function u(t) {

c.width=3e2
x.fillText("below🠗",10,10)
throw([...Array(20)].map((v,i)=>" ".repeat(20-(z=S(i/2+t*2)*20))+"/"+"_".repeat(20+z)+"\\").join`
`)

Jan 27 2021 6:15 PM UTC

}// 140/140

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the errors are the dweet..

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aaaaaz

function u(t) {

i=frame;i%=64;j=1+i/9;r=(X,Y,s)=>{x.beginPath(),x.arc(X,Y,s*2,0,7),x.fillStyle=i%2?'#FFF':'red',x.fill()}
r(960,540+S(j)*1899,299+S(t)*299)

Jan 27 2021 5:47 PM UTC

}// 140/140

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Qwitter

remix of d/21458 by u/Xen

function u(t) {

c.style.filter=`blur(15px)contrast(80)`;w=c.width=160;
for(i=99;i--;x.fillStyle=R(99*S(i*t),80,i*t))x.fillRect(49+T(i+t),45+99*C(i*t),9,6);

Jan 27 2021 3:56 PM UTC

}// 139/140

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Membrane

u/Xen

nice

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rodrigo.siqueira

remix of d/21469 by u/rodrigo.siqueira

function u(t) {

f = (X,Y,n=120)=>T(S(X+Y/5)*5)<9 ? f(X*X-Y*Y,2*X*Y+.7,n-2):n
for(var i=1920;i--;) {
 x.fillRect(i,t*120,.5-f(i/40000-.45,t/300+.205)/40,2)
}

Jan 27 2021 3:45 PM UTC

}// 140/140

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Growing thorns.... (just changed Sin amplitude from 2 to 5)

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rodrigo.siqueira

remix of d/21456 by u/rodrigo.siqueira

function u(t) {

f = (X,Y,n=120)=>T(S(X+Y/5)*2)<9 ? f(X*X-Y*Y,2*X*Y+.7,n-2):n
for(var i=1920;i--;) {
 x.fillRect(i,t*120,.5-f(i/40000-.45,t/300+.205)/40,2)
}

Jan 27 2021 1:28 PM UTC

}// 140/140

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Black&white #julia noir #fractal noise (code not golfed)

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