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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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codingsilver

remix of d/21263 by u/codingsilver

function u(t) {

with(x)t|clip(ellipse(A=960,B=540,A,B,0,0,7)),beginPath(M=Math.random),fillStyle=R(22,22,22,0.6),fillRect(a=2*A*M(),b=2*B*M(),B,10)

Jan 14 2021 9:23 AM UTC

}// 131/140

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codingsilver

remix of d/21262 by u/codingsilver

function u(t) {

with(x)t|clip(ellipse(A=960,B=540,B,B,0,0,7)),beginPath(R=Math.random),fillStyle=`hsl(${t*30},50%,70%)`,fillRect(a=2*A*R(),b=2*B*R(),B,10)

Jan 14 2021 9:22 AM UTC

}// 138/140

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codingsilver

remix of d/21222 by u/f8f82804

function u(t) {

with(x)t||clip(ellipse(A=960,B=540,B,B,0,0,7)),beginPath(R=Math.random),fillStyle=`hsl(${t*79},50%,50%)`,fillRect(a=2*A*R(),b=2*B*R(),20,20)

Jan 14 2021 9:11 AM UTC

}// 140/140

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codingsilver

function u(t) {

c.style.filter=`blur(2px)`
x.fillStyle = R(190,3*t,t*13,0.8)
for(i=0;i<22;i++)
x.fillRect(100*i,Math.exp(0.9)*i*20*S(t),50,80)

Jan 14 2021 4:52 AM UTC

}// 128/140

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Xen

remix of d/21223 by u/Pascal

function u(t) {

x.fillStyle=`hsl(${t*t} 50%50%)`
x.arc(960,540,9,!x.fill(x.drawImage(c,X=-t+T(t*t),X,1920-2*X,1080-2*X)),7)

Jan 10 2021 9:16 PM UTC

}// 107/140

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Transition

u/Xen

#waitforit

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codingsilver

function u(t) {

x.beginPath();x.moveTo(0, 0);x.strokeStyle='#ffa500';x.lineTo(Math.random(0.3)*2000, Math.random(0.9)*5000);x.stroke();

Jan 10 2021 9:56 AM UTC

}// 119/140

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nusyn

function u(t) {

x.fillRect(1,1,t*t,c.width)

Jan 7 2021 2:35 PM UTC

}// 27/140

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test1

u/Xen

welcome to the dwitter family!

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Pascal

function u(t) {

f=(1+5**.5)/2+(t+2)/1500;for(c.width|=i=0;i<700;i++)d=(i/(700-1))**-3,x.fillRect(960-150*d*C(a=2*Math.PI*f*i),540-150*d*S(a),10,10);

Jan 6 2021 11:47 AM UTC

}// 132/140

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inverse golden ratio

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wpower3

remix of d/21070 by u/wpower3

function u(t) {

Z=20+t;W=1920/Z;for(n=0;n<W*1080/Z;n++){j=n/W;i=n%W;if(Math.random()>.9999)x.fillRect(i*Z,j*Z,Z,Z,x.fillStyle=R(255*(1-i/W),255*i/W,0))}

Dec 27 2020 12:53 AM UTC

}// 137/140

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Adding the +t to the 'scale' every call, and upping the threshold for drawing causes some cool effects as the image fills in.

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wpower3

function u(t) {

Z=20;W=1920/Z;H=1080/Z;for(n=0;n<W*H;n++){j=n/W;i=n%W;
if(Math.random()>0.999)x.fillRect(i*Z,j*Z,Z,Z,x.fillStyle=R(255*(1-i/W),255*i/W,0))}

Dec 26 2020 9:55 PM UTC

}// 140/140

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Christmas colors