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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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New_Core

function u(t) {

with(x)for(c.width|=i=9;i--;fill())beginPath(fillStyle=R(255-i*255,255-i*9)),arc(X=960+(80-i*9)*S(t+i/9),Y=i*40+99,50+i*50,1,2),lineTo(X,Y)

Dec 16 2020 7:01 PM UTC

}// 139/140

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this year the Christmas tree has a "star" but no decoration

u/pavel

-4 with(x)for(c.width|=i=9;i--;fill(arc(X,Y,50+i*50,1,2)))beginPath(fillStyle=R(255*!i,255-i*9)),moveTo(X=960+(80-i*9)*S(t+i/9),Y=i*40+99)
u/pavel

-1 255*!i -> !i<<7

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Pascal

function u(t) {

eval(unescape(escape`𨰮𬱴𮑬𩐮𩡩𫁴𩑲🐢𨡬𭑲𚀱𜁰𮀩𨱯𫡴𬡡𬱴𚀹𞐩𪑮𭡥𬡴𚀩𘠻𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛀱𞐲𜀬𜐰𞀰𚐻𩡯𬠨𪠽𜡥𜰻𪠭𛐾𜀻𚑲🐲𜀰𛰨𦠽𚁔𚁪𚠮𝠱𚐭𭀯𜠰𚐥𜐩𛁸𛡣𫁥𨑲𤡥𨱴𚁃𚁪𚐪𬠫𞐶𜀬𤰨𪠪𪠩𚡲𚰵𝀰𛀶𜀯𦠪𚠰𛠵𛀶𜀯𦠪𚠰𛠵𚐠`.replace(/u../g,'')))

Dec 13 2020 1:55 PM UTC

}// 131/140

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Liquid cow #metaballs

u/magna

Wow!

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geb

remix of d/20747 by u/danny@hille.dk

function u(t) {

for(m=Math,c.width=X=66;X--;)for(Y=44;Y--;x.fillStyle=R(o=S(S(X*Y)+(m.hypot(X-32,Y-21)/13-t)*5)*230,o*.8,-o))x.fillRect(X,Y,1,1)

Nov 21 2020 1:10 PM UTC

}// 128/140

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u/danny@hille.dk

NICE! you could zoom the ripples for a psychodelic wave like this for(c.width=X=64,w=30;X--;)for(Y=38;Y--;x.fillStyle=R(o=S(S(X/9*Y/9)+(Math.hypot(X-32,Y-21)/13-t)*5)*230,o*.8,-o))x.fillRect(X,Y,1,1)
u/danny@hille.dk

or pixelate, for some retro style, and mess with the colors: for(w=30,X=64,w=30;X--;)for(Y=38;Y--;x.fillStyle=R(o=S(S(X/9*Y/9)+(Math.hypot(X-32,Y-21)/13-t)*5)*230,-o,o))x.fillRect(X*w,Y*w,w,w)

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smtsjhr

function u(t) {

for(c.width|=n=4;n--;x.stroke())for(i=80;k=(150+80*C(t*i/50))-t%1**i,i--;)x.lineTo(450*n+250+k*S(j=i*6.28/(n+3)),540-k*C(j+t*(n+3)/5))

Nov 14 2020 9:50 PM UTC

}// 134/140

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webbed polygons spin themselves

u/katkip

looking nice
u/rodrigo.siqueira

I once made one similar, a "Polygon showcase" from 1 to 8 vertices: https://www.dwitter.net/d/10692
u/smtsjhr

@ u/rodrigo.siqueira very nice and concise! i think maybe there's room there for one more loop to iterate through the "web" like

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yonatan

function u(t) {

for(i=2e3;i--;)Y=frame/500-1,X=i/500-2,s=X+Y+(q=1-X*X-Y*Y)**.5,x.fillRect(i,frame,q<0?1:s>1?0:1-s,1)

Oct 29 2020 11:34 PM UTC

}// 100/140

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lit sphere via https://twitter.com/kamoshika_vrc/status/132…

u/joeytwiddle

#sphere
u/joeytwiddle

#sphere #lighting #raytracing
u/tomxor

Nice!

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DataMeta

remix of d/20373 by u/Xen

function u(t) {

for(i=480;i--;x.fillStyle=R(0,g=i*C(S(t+i/3)+t+S(i/(1+T(i)))),g*.7))x.fillRect(i*4,0,r=Math.random(),r);x.drawImage(c,0,4,1920+(o=9),1080+o)

Oct 25 2020 9:46 PM UTC

}// 140/140

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#aurorae - going off danny@hille's tweak to d/20373

u/Xen

nice!
u/joeytwiddle

Smooth

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pavel

remix of d/20353 by u/solendil

function u(t) {

d=(V,D,i=1<<V/8%16)=>x.fillRect(X,Y,X+Y+D&2,1,x.fillStyle=R((4591&i)*w,(4096&i)*w));for(X=t?0:c.width=w=512;X--;)for(Y=288;Y--;d(X,0))d(Y,2)

Oct 22 2020 9:59 PM UTC

}// 140/140

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4591 and 4096 specify the 16 bit patterns for the red / green channels

u/pavel

0001000111101111 and 0001000000000000 respectively (rendering flips the order)
u/danny@hille.dk

👍
u/solendil

Congratulations ! :)
u/tomxor

nice

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rodrigo.siqueira

remix of d/20162 by u/rodrigo.siqueira

function u(t) {

x.fillRect(0,0,w=2e3,w)
for(i=900;i--;x.strokeRect(0,540+S(i/400+t*5)*360,w,w))x.setLineDash([i]),x.lineDashOffset=-990%i,x.strokeStyle=R(i)

Oct 4 2020 2:58 PM UTC

}// 140/140

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Waving chessboard #chess

u/Leodude123

#awsome!!!!!!

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KilledByAPixel

function u(t) {

for(t*=b=540,i=3e3;j=i--/470;x.fillRect(960+t*S(j),b+t*C(j),9,9))a=(i/64+(t>>6)|0)%2,x.fillStyle=t%64<9?a^t>b?R():'#fff':R(b*!a,t/5,b*a)

Oct 2 2020 6:44 PM UTC

}// 136/140

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False Motion Optical Illusion 👁️👁️

u/KilledByAPixel

#illusion

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danny@hille.dk

remix of d/19972 by u/danny@hille.dk

function u(t) {

for(c.width|=X=60;X--;)for(T=Y=34;Y--;)x.fillStyle=R(m=99*(S(X*Y+Y/2*Y/9*(S(t
/9)))/222**C(Y/9*S(t)+X/11*C(t))),m/9),x.fillRect(X*T,Y*T,T,T)

Sep 30 2020 6:35 PM UTC

}// 140/140

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u/sigveseb

nice one!
u/danny@hille.dk

WebGL version: http://glslsandbox.com/e#68778.0