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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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b44ken

function u(t) {

n=Math.ceil(t*10)
w=200*n
q=500
x.beginPath()
x.moveTo(w-q,q)
for(i=0;i<7;i+=6.28/n) x.lineTo(99*S(i)+w-q,99*C(i)+q)
x.fill()

Sep 2 2020 6:46 AM UTC

}// 126/140

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rodrigo.siqueira

remix of d/19818 by u/rodrigo.siqueira

function u(t) {

f=(X,Y,n=3)=>Y*Y+X*X>4?n:f(2*X*Y+.7,Y*Y-X*X,n+16);for(i=2e3;i--;x.fillRect(i,t*60,1,1))x.fillStyle=`hsl(${K=f(i/3e3,t/45)},99%,${S(K)*90}%)`

Sep 1 2020 2:27 PM UTC

}// 140/140

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Deep #fractal spirals

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ScalarField

function u(t) {

if(!t){c.b=1<<16}n=i=0;for(;i<32;n+=(b&&b<5)<<i++){(c.b>>i)&1&&x.fillRect(60*i,3600*t,60,60);b=(c.b>>(i-1))&7}c.b=n

Aug 30 2020 9:12 PM UTC

}// 116/140

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Rule 30 Automaton

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danny@hille.dk

function u(t) {

for(c.width|=i=0;i<7;i+=.01){x.lineWidth=8
r=(.5*S(5+i))*(.5*C(i-6))*2e3
a=i+S(r/99+t)
x.lineTo(960+r*C(a),540+r*S(a))
}x.stroke()

Aug 29 2020 8:45 PM UTC

}// 130/140

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Xen

remix of d/19787 by u/danny@hille.dk

function u(t) {

for(c.width|=i=128;i--;x.lineTo(X+C(X)+C(X)*799+960,Y+S(X)+S(X+Y-t)*499+440))
X=S(x.lineWidth=9+(t/i)%9)*i,Y=C(t/i)*i;x.stroke()

Aug 29 2020 4:59 PM UTC

}// 128/140

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Quick play

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hauntedg

remix of d/19729 by u/hauntedg

function u(t) {

for(c.width|=i=144;i--;)0x0ff8300e47e24c32481249524142300c0ff0n>>BigInt(i)&1n&&x.fillRect((5*t+i)%16*120,(i/16|0)*120,120,120)

Aug 19 2020 8:35 AM UTC

}// 127/140

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Leaner bitmap scroller

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hauntedg

function u(t) {

w=c.width=1920
for(i=0;i<20;i++){
k=(i*145+t*1000)%(w+1000)
x.beginPath()
x.moveTo(0,k)
x.lineTo(k-S(5*t)*200,0)
x.lineWidth=i
x.stroke()
}

Aug 16 2020 8:28 PM UTC

}// 140/140

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Learning the trade

u/Xen

nice
u/Xen

for(w=c.width|=i=20;i--;x.stroke())x.moveTo(!x.beginPath(x.lineWidth=i),k=(i*145+t*1e3)%(w+1e3)),x.lineTo(k-S(5*t)*200,0)
u/hauntedg

Thanks, as the title implies, this was my first dwit, still new at this

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jgobi

remix of d/19663 by u/veubeke

function u(t) {

c.width^=0
V=11
for(i=400;i--;x.fillRect(960-6+C($)*_,540-6+S($)*_,12,12))$=i/200*Math.PI**V,_=500*S(t+i/4),x.fillStyle=`hsl(${_},99%,50%)`

Aug 15 2020 12:06 AM UTC

}// 139/140

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a nice variation, try changing V to some other number, it's very fun! ✨

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danny@hille.dk

function u(t) {

for(t?c.width=99:(a=[1,20,6,17,17,2,15],g=0),i=7;i--;x.fillText(String.fromCodePoint(a[i]+g),i*8+22,30))t%9<1?g=99:g+=3

Aug 14 2020 3:34 PM UTC

}// 119/140

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rot99

u/danny@hille.dk

Inspired by d/19649 by u/New_Core

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Iku-turso

function u(t) {

c.width=1920
for(i=0;i<6;i++) {
  x.fillRect(400, 100+i*100+S(t)*300, 800, 50);
  x.fillRect(100+i*100+S(t)*300, 400, 50, 800)
}

Aug 14 2020 10:30 AM UTC

}// 128/140

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u/tomxor

dwitter 2d! welcome :)
u/tomxor

Here's some golfing ideas for you: c.width|=0;for(i=12;i--;)x.fillRect(...i&1?[X=50+i*50+S(t)*300,400,50,800]:[400,X,800,50])