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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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katkip

remix of d/2868 by u/CodeUh

function u(t) {

c.width=1920;x.beginPath();x.translate(900,550);x.scale(9,9)
  for(i=0;i<23;i++)
    x.lineTo(50*S(i+t*i/6),50*C(i+t*i/5));
  x.stroke();

Aug 27 2018 11:38 AM UTC

}// 140/140

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prplz

remix of d/9441 by u/prplz

function u(t) {

let i,j,k
for(j=k=32;j--;)for(i=60;i--;x.fillRect(i*k,j*k,k,k))x.fillStyle='#'+(((i*i*.2-j)+t*k)*27&4095).toString(16)

Aug 27 2018 7:57 AM UTC

}// 118/140

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Galaxtone

remix of d/6498 by u/yonatan

function u(t) {

eval(unescape(escape`稽⡸ⱹⱺ⤽㹸㱹㽹㩸㹺㽺㩸㭯湭潵獥浯癥㵥㴾筣⹷楤瑨㴹㤻景爨椽㈻椭ⴻ砮獴牯步剥捴⠲㤫㈳⩩ⰲ〬ㄹⰱ㤩⥸⹦楬汒散琨㌴⬲㌪椫稨攮砯㈸ⴱ〬ⴵⰵ⤬稨㈲⭥⹹⼱㜭㘬㈰ⰳ〩ⰹⰹ⥽㭴籼潮浯畳敭潶攨筸㨹ⱹ㨹紩`.replace(/u(..)/g,"$1%")))

Aug 27 2018 2:54 AM UTC

}// 140/140

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Exaggerated the eyes a bit.

u/katkip

#interactive

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f8f82804

remix of d/9456 by u/f8f82804

function u(t) {

τ=4.7124;for(a=i=200;i--;x.fillRect(960+500*S(τ*t-i/a),520+500*C(t+i/a),39,39))x.fillStyle=R(99+a*S(b=(t+i)**(S(t)/3)),a*S(b+τ),a+a*S(b-τ))

Aug 27 2018 1:44 AM UTC

}// 139/140

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atsn

remix of d/9445 by u/ai221

function u(t) {

for(i=c.width^=0;i-=3;)x.fillRect(i,S(i/3*S(t)*t/100)*100+540,3,3)

Aug 27 2018 1:26 AM UTC

}// 66/140

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Reduced to 66 characters

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katkip

function u(t) {

if(!t)x.translate(960,540);c.onmousemove=e=>{X=e.x;Y=e.y};x.fillRect(X,Y,20,20);x.rotate(3);x.fillStyle=`hsl(${X+Y},99%,50%)`

Aug 26 2018 7:06 PM UTC

}// 125/140

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Move your mouse and draw a symmetrical polar drawings. #mouse #symmetrical #internactive

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katkip

remix of d/9439 by u/katkip

function u(t) {

if(!t){l=0;r=-1}while(l<108){x.fillStyle=`hsl(${C(r*r-t)<S(l*l+t)?50:25},99%,50%)`;x.fillRect(++r*10,l*10,10,10);if(r>190){l++;r=-1}}l=0

Aug 25 2018 7:59 PM UTC

}// 136/140

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VIsualizing C(r*r-t)<S(l*l+t)

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katkip

function u(t) {

for(i=0;i<9;i++){x.fillStyle='#fff';x.fillRect(0,S(t)*i*500,9,9);x.fillStyle='#000';x.fillRect(0,S(t)*i*255,9,5)}
x.drawImage(c,t,0)

Aug 25 2018 7:53 PM UTC

}// 132/140

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katkip

remix of d/9427 by u/katkip

function u(t) {

if(!t){l=0;r=-1}while(l<108){x.fillStyle=`hsl(${S(r+t)*r*5&C(l+t)*l*5},99%,50%)`;x.fillRect(++r*10,l*10,10,10);if(r>190){l++;r=-1}}l=0

Aug 25 2018 12:29 PM UTC

}// 134/140

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Pixel Universe

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katkip

remix of d/9425 by u/katkip

function u(t) {

if(!t){l=0;r=-1}while(l<22){x.fillStyle=`hsl(${r**r+t*25+l**l},99%,50%)`;x.fillRect(++r*50,l*50,50,50);if(r>38){l++;r=-1}}l=0

Aug 25 2018 12:11 PM UTC

}// 125/140

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Evolving