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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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gai

function u(t) {

c.width=1920
for(i=10;i--;x.fillRect(c.width/2-i*50,c.height/2-i*50+S(t)*50,i*100+S(t),i*100+S(t)))x.fillStyle=R(255/i+75,255/i+75,0);

Jan 28 2023 12:23 AM UTC

}// 134/140

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idrk

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Mkac003

function u(t) {

eval(unescape(escape`󩭯󬬨󪜽󜌬󮌮󭽩󩍴󪌽󜜹󜬰󛍶󟝛󜜬󜭝󛍰󟝛󜌬󜍝󞽩󟌱󩜳󚭴󞽩󚼫󚝰󦼰󧜫󟝶󦼰󧜬󬍛󜝝󚼽󭭛󜝝󛍰󦼰󧜾󜜸󜬱󯌡󬍛󜍝󙬦󚍶󦼰󧜪󟜭󜜩󛍰󦼱󧜾󞜸󜝼󘝰󦼱󧜦󙬨󭭛󜝝󚬽󛜱󚜻󫌽󜬵󝜪󣝡󭍨󛭲󨝮󩍯󫜨󚜬󮌮󩭩󫍬󤽴󮝬󩜽󤬨󫌬󫌬󫌩󛍸󛭦󪝬󫍒󩝣󭌨󬍛󜍝󛍰󦼱󧜬󞜹󛌹󞜩`.replace(/u../g,'')))

Jan 26 2023 6:21 PM UTC

}// 140/140

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A better version of my first dweet, this one doesn't lag so much. Thanks for all the awesomes on my other posts!

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neimad

remix of d/26942 by u/neimad

function u(t) {

c.width=w=255
for(i=w;i--;){r=S(i/9+(2-C(t)*4))*w
g=S(i/8+(4-S(t)*8))*w
b=S(i/7-(3-S(t)*6))*w
x.fillStyle=R(r,g,b)
x.fillRect(0,0,i,i)}

Jan 26 2023 5:45 AM UTC

}// 135/140

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u/Xen

nice style!

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Mkac003

function u(t) {

for(l=-99,c.width=1920,x.translate(960,540),i=0;i<5;i+=1)x.fillStyle=R(99*i),x.rotate(S(t)*(t/8+i)),x.fillRect(l-5*i,l-5*i,2*l+9*i,2*l+9*i);

Jan 25 2023 10:18 PM UTC

}// 140/140

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squares

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StrayDev

function u(t) {

t?t:z=y=t;a=[[4,0],[0,6],[8,6]];b=a[t**5%3|0];z=b[0]*50+z/2;y=b[1]*50+y/2;t>1?x.fillRect(z,y,5,5):t

Jan 25 2023 8:02 PM UTC

}// 99/140

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Triangles

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patorick1

function u(t) {

for(i=0;i<60;i++){for(j=0;j<150;j++){
r=Math.floor(Math.random()*255)
x.fillStyle=R(t*i,j,255-r,S(t))
x.fillRect(i*r,j*r,r,r*t)
}}

Jan 25 2023 4:35 AM UTC

}// 130/140

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Mixony

function u(t) {

k=(n=12)*20
c.width=8*k
l=["#E00","#00E","#EEE"]
for(i=0;i++<n*9;)for(j=0;j++<3;){x.fillStyle=l[j-1]
x.fillRect(n*i,i/n*S(6*t+i/3)+k*j,n,k)}

Jan 24 2023 2:57 AM UTC

}// 140/140

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First time, so here is a flag.

u/joeytwiddle

Wind should flow from the flagpole outwards, so S(i/3-6*t)

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Ohead

function u(t) {

t?t:z=y=t;a=[[4,0],[0,6],[8,6]];b=a[Math.random()*3|0];z=b[0]*50+z/2;y=b[1]*50+y/2;t>1?x.fillRect(z,y,5,5):t

Jan 23 2023 5:41 PM UTC

}// 108/140

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Sierpiński attempt

u/joeytwiddle

A cheeky alternative to Math.random()*3 could be t**5%3
u/Ohead

That IS cheeky! Thanks for the tip :)

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taupelink

remix of d/26784 by u/taupelink

function u(t) {

eval(unescape(escape`昽⡸Ɱ㴶㐩㴾䵡瑨⹡扳⡮㽦⡸Ɱ㸾ㄩ㩸⤭ㄯ⡮⬱⤻朽䄽㹸⹦楬汒散琨⸮⹁⤻木嬹㘰ⰰⰱⰲ攳崩㭧⡛〬㔴〬㉥㌬ㅝ⤻景爨椽ㄹ㈰㭩ⴭ㭧⡛椬㔴〭㌲〪夬㈬㉝⤩堽⡩ⴹ㘰⤯㌲〬夽昨堩`.replace(/u([^D].)/g,'$1%')))

Jan 9 2023 5:59 PM UTC

}// 129/140

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d/26793

u/taupelink

For future reference. Inspired by SDFs and Piter Pasma's video about them

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patorick1

function u(t) {

c.width=999
for(i=0;i<40;i++){for(y=0;y<40;y++){t=new Date().getTime()*.000003
z=S(100*(i*S(t/2)+y*C(t/3))+t)*9
x.fillRect(i*9,y*9,z,z)
}}

Jan 8 2023 7:32 PM UTC

}// 138/140

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third attempt