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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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Pascal

function u(t) {

c.style.filter="blur(30px)contrast(99)";for(c.width|=k=300,l=0;l<4;l++)e=l*1.6,x.fillRect(860+k*C(3*t+e)+k*S(t+e),400+k*S(5*t+e)*C(t+e),k,k)

Dec 12 2020 8:50 PM UTC

}// 140/140

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mirrored #metaballs

u/Xen

smooth
u/magna

wobbly

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rodrigo.siqueira

remix of d/20961 by u/cantelope

function u(t) {

for(x.fillRect(0,0,i=2e3,i);i--;x.clearRect(960+Y/(Z=d+8)*(h=540),h+X/Z*h+i/9,6,X))X=S(i)*(G=T(q=i/45))-1,Y=S((Z=q*9)+t)*(d=T(Z*9))

Dec 12 2020 12:11 AM UTC

}// 131/140

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Aligning the stars (cosmic axis) #stars

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cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛁩🐲𩐳𛁩𚐻𪐭𛐻𮀮𨱬𩑡𬡒𩑣𭀨𞐶𜀫𦐯𚁚👃𚁰𚐪𩀫𞀩𚠨𪀽𝐴𜀩𛁨𚱘𛱚𚡨𛀵𛀸𚐩𦀽𤰨𬀽𪐯𜰮𜐸𜰩𚠨𡰽𤰨𬐽𚁩𛰲𜁼𜀩𛰹𛠵𝐫𭀩𚐫𡰪𝀬𦐽𤰨𬀽𣑡𭁨𛡡𭁡𫠲𚁙👃𚁰𚐬𦠽𠰨𬐩𚠴𚱓𚁰𚐪𠰨𬐩𚐫𭀩𚠨𩀽𣑡𭁨𛡨𮑰𫱴𚁙𛁚𚐩`.replace(/u../g,'')))

Dec 11 2020 2:39 PM UTC

}// 140/140

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perspective torus #d3

u/rodrigo.siqueira

I always learn a lot about perspective by reading Cantelope's code. Thanks!

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TGY

function u(t) {

with(Math)x.fillRect(t*=99,1e3-1e3*exp(-pow(t-1e3,2)/1e5),9,9)

Dec 8 2020 5:07 PM UTC

}// 62/140

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This should be quite normal for a first dweet (Normal distribution)

u/Xen

Welcome to the dwitter family
u/rodrigo.siqueira

I once made this normal distribution (Gaussian) by flipping coins and plotting results, here: d/14261

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Lynx

function u(t) {

x.fillStyle='darkred'
x.fillRect(0,0,1920,1080)
x.fillStyle='black';s=0
for(i=1;i<11;s=S(t*i++/5))x.fillRect(500+i*75,500,35,-(5+127*s*s))

Dec 8 2020 11:17 AM UTC

}// 138/140

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calm sine visualizer (newbie)

u/magna

Stylish!

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pavel

remix of d/20898 by u/cantelope

function u(t) {

for(c.width=i=640;i--;T=!T&&!x.beginPath(x.stroke()))j=i/16-T*i&30,r=(j+4)/12<<6,x.arc(320+r*C(a=j/1.91+t),180+r*S(a),i&30?0:32,0,7)

Dec 4 2020 3:01 AM UTC

}// 132/140

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Metatron's Cube

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u/pavel

Golfed this one a little bit :) #symmetry
u/pavel

i=[4 bits for start circle index][4 bits for end circle index offset from start circle][1 bit to decide start vs end]
u/pavel

That's 2**9=512 which is too small for power-of-two circle sizes but start clicle index wraps around so larger i is only redundant.
u/pavel

end-circle-offset == 0 is easy to check and means start and end are same circle, so draw that circle.
u/pavel

Otherwise draw the current circle with radius 0 which is same as lineTo.
u/pavel

T=!T&&!x.beginPath(x.stroke()) starts/strokes the path every two circles.
u/pavel

Here is a version before all the bit hacking for(c.width=640,i=16;i--;)for(j=16;j--;x.beginPath(x.stroke()))for(k=2;k--;)q=(i+j*k)%16,r=((q+2)/6|0)*64,x.arc(320+r*C(a=Math.PI/3*q+t),180+r*S(a),!j*32,0,7)

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MrHaila

function u(t) {

c.width^=0
for(i=0;i<20;i++){
o=S(S(t*(i+1))*(S(t)-0.5))*800
q=i*98
e=i*2.5
x.fillRect(q,400,50,200+o+e)
x.fillRect(q,700+o-e,50,200-o+e)
}

Dec 3 2020 10:13 PM UTC

}// 139/140

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Hello world!

u/Xen

welcome to the dwitter family!

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pavel

remix of d/17103 by u/pavel

function u(t) {

for(t?m.push({X,Y,R})+x.beginPath(x.fill(x.arc(X,Y,R,0,7))):m=[];R=420/++t,Y=t%3*360,X=Y*Y*R%2e3,m.find(a=>Math.hypot(X-a.X,Y-a.Y)<R+a.R););

Nov 29 2020 4:06 AM UTC

}// 140/140

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Quicker Blots

u/Qwitter

sponged

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jellyedwards

remix of d/18487 by u/KilledByAPixel

function u(t) {

c.width=300
X=++T%32
T=0>S?0:T
onmousedown=_=>S=C=5
S=S?S+=--C:X<30?S:T=-1
x[f='fillText']('🌵',8*X,w=99)
x[f]('🦖',250,w-S)
x[f](T>>5,0,w)

Nov 27 2020 11:10 AM UTC

}// 137/140

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Damn my connection went again... #game #uncompressed

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u/jellyedwards

He dies on the very first click so click again!
u/jellyedwards

Also you can cheat pretty easily but the T-Rex was a member of the Coelurosauria so you never know...
u/ciaccodavide

gj!
u/jellyedwards

https://en.wikipedia.org/wiki/Theropoda#Rela…
u/jellyedwards

try link again: https://en.wikipedia.org/wiki/Theropoda#Rela…
u/katkip

#tagfail

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rodrigo.siqueira

remix of d/20796 by u/rodrigo.siqueira

function u(t) {

for(i=3e3,c.width|=f=g=>i*C(i)*g(i/8+t)/8;i--;x.fillRect(510+870*(i%2)+f(S),540+f(C),5,5))x.fillStyle=R(i/99,i/9,i),c.style='filter:invert('

Nov 25 2020 7:04 PM UTC

}// 140/140

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Rotating double spirals #spiral