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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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rodrigo.siqueira

remix of d/20439 by u/rodrigo.siqueira

function u(t) {

for(i=2e3,f=(X,Y,n=120)=>T(X)<9?f(X*X-Y*Y-.8,2*X*Y+.2,n-3):x.fillStyle=`hsl(${i/8},80%,${C(n)*n}%`;i--;x.fillRect(i,t*60,1,1))f(i/3e3,t/50)

Jan 26 2021 1:52 PM UTC

}// 139/140

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Loopy spirals #fractal #julia (same fractal from previous remix, but with new coloring method)

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taupelink

remix of d/21416 by u/taupelink

function u(t) {

for(i=k=120;i--;x.fillRect(k*X,k*Y,i/t,i/t))f=i*t,X=f*f%16,Y=X*f%9,h=i*C(m=C(q=C(X|0)%S(Y)*9)%C(p=C(Y|0)*X/9)*9),x.fillStyle=R(h*p,h*q,h*m)

Jan 26 2021 1:03 AM UTC

}// 139/140

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d/21451

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KilledByAPixel

remix of d/14752 by u/KilledByAPixel

function u(t) {

t%=1
c.width|=X=Y=Z=1
for(i=3e3;i--;x.fillRect(880+(a+t*X)*73,1200-(b+t*Z)*23,9,9))a=X-X*t,b=Z-Z*t,Z+=(X*Y-Z)/39,X+=(Y-X)/9,Y+=X*(27-Z)/90

Jan 25 2021 11:26 PM UTC

}// 138/140

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Animated #Lorenz Attractor Loop

u/KilledByAPixel

could be c.width|=t%=X=Y=Z=1

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Xen

remix of d/21448 by u/Xen

function u(t) {

onmousemove=e=>x.lineTo(e.x/.3,e.y/.3,x.stroke())

Jan 25 2021 7:10 PM UTC

}// 49/140

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49 another slight golf

u/Xen

*3 save 2 more bytes but not too exact sorry

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Xen

remix of d/21445 by u/ciaccodavide

function u(t) {

onmousemove=e=>x.lineTo(e.x*3.4,e.y*3.4,x.stroke())

Jan 25 2021 7:07 PM UTC

}// 51/140

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51 slight golf

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ciaccodavide

remix of d/21446 by u/ciaccodavide

function u(t) {

f=(i,j=i%1,k=~~i,m=j*j*(3-2*j))=>S(k*k)*m---m*S(--k*k)
c.width|=0
for(Y=126;Y-=9;)for(i=2e3;i--;)x.fillRect(i,Y*9-81,f(i/32+S(Y+t/2)*Y),81)

Jan 25 2021 6:56 PM UTC

}// 139/140

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Noise bands with bending lines #illusion

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ciaccodavide

remix of d/18086 by u/pavel

function u(t) {

f=(i,j=i%1,k=~~i,m=j*j*(3-2*j))=>S(k*k)*m---m*S(--k*k)
c.width|=0
for(Y=126;Y-=9;)for(i=1920;i-=24;)x.fillRect(i,Y*9-81,f(i/32+5*t)*24,81)

Jan 25 2021 6:52 PM UTC

}// 138/140

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Eyesmelting Barcode

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ciaccodavide

function u(t) {

t?onmousemove=e=>x.lineTo(e.x,e.y,x.stroke()):c.width=568

Jan 25 2021 6:39 PM UTC

}// 57/140

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Smallest (?) #interactive line drawer

u/Xen

love it!

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Qwitter

remix of d/21364 by u/Qwitter

function u(t) {

eval(unescape(escape`𤤽𜔳𜄫𞔪𤴨𜴪𭄩𞵸𛥦𪕬𫅓𭅹𫅥🔢𘴲𜤴𜔢𞵸𛥦𪕬𫅒𩕣𭄨𜄬𜄬𫔽𜥥𜴬𫔩𞴊𩥯𬤨𪴽𜥥𜤻𪴭𛔻𚕌🔱𚵓𚅴𚤷𚔯𝔬𪄽𪴫𭄬𤔽𤤪𚄲𚵃𚅨𚔪𣄩𛅰🕒𚥓𚅨𚔪𣄬𮄮𨵬𩕡𬥒𩕣𭄨𫔯𜤫𤴨𭄩𚥑𛄵𝄰𛕃𚄱𚔪𬄫𤴨𜔩𚥃𚅴𚔪𤔬𥴽𤤯𚄱𛤳𚥒𛕰𚔪𚤮𜴬𥴩𞴊`.replace(/u../g,'')))

Jan 25 2021 5:26 PM UTC

}// 137/140

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Pressurized Peace

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rodrigo.siqueira

remix of d/21434 by u/rodrigo.siqueira

function u(t) {

for(i=1080;i--;x.fillRect(a=t*120,i,2,.2-f(a/1000-1.3,i/990)))f=(X,Y,n=90)=>T(t*X)*S(Y)*2<2?f(X*X-Y*Y,2*X*Y+.7,n-=2):n/70

Jan 25 2021 2:54 PM UTC

}// 121/140

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Thorn forest #mandelbrot #fractal

u/Xen

Love it!
u/aaaaaz

#forest