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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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Current theme challenge: #Food

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Xen

remix of d/18534 by u/myro

function u(t) {

for(i=1e3;i--;x.fillStyle=R(255,v*S(t-v),!x.fillRect(u*79,v*3,v,v),.3))u=(8*t+i)%25,v=C(t-i)+i-u*9

Apr 29 2020 7:54 PM UTC

}// 98/140

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golf and test

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myro

function u(t) {

c.width=1920;t%=8;n=t*10-25
for(i=1;i<20;i++){t+=.06
v=100+200*(-2+(t)*2%4)**2
x.fillStyle=R(v,i*2*n,5*n)
x.fillRect(32*(i+n),v,i*8,i*8)}

Apr 29 2020 6:51 PM UTC

}// 137/140

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just passing

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rodrigo.siqueira

remix of d/18531 by u/rodrigo.siqueira

function u(t) {

for(i=2e3,f=(X,Y,n=11)=>X/Y<n?f(X*X-Y*Y-.8,2*X*Y+.2,n-.3):x.fillStyle=`hsl(0,99%,${n**1.9}%`;i--;x.fillRect(i,t*60,1,999))f(i/490-2,1-t/9)

Apr 29 2020 5:41 PM UTC

}// 138/140

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#Julia set fibers. #fractal similar to "Pickover stalk" and biomorph forms. Using this compact form of the test: X/Y < n

u/rodrigo.siqueira

#pickover

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Natsumi

function u(t) {

c.width=1920
for (d=i=0;i<255;d=5*T(t)*i++) {
x.fillStyle=R(i,i,i);
x.fillRect(d,d,c.width-d*2,c.height-d*2)
}

Apr 29 2020 5:34 PM UTC

}// 110/140

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flashbang

u/Natsumi

experimenting with fillRect, but I'm still not sure how to make time change the colors
u/Xen

try: x.fillStyle=hsl(${i+t*99},50%,50%)

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Natsumi

function u(t) {

d=c.width=1920;for(i=0;i<d;i++){x.beginPath();x.arc(960, 540, 2000*Math.abs(T(i)*C(t/2)),0,7);x.stroke();}

Apr 29 2020 5:07 PM UTC

}// 106/140

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away she goes, starburst!

u/Natsumi

It's cool to see how just plain circles can make such interesting patterns.

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myro

function u(t) {

w=1080
c.width=w
for(r=0;r<w;r++){
a=(r+t*59)%6.3
u=2*r*C(a)
v=r*S(a)
x.fillStyle=R(-v/2,r/2,(w-r)*.2)
x.fillRect(u+w/2,v+w/4,r/5,r/5)
}

Apr 29 2020 4:27 PM UTC

}// 136/140

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whirlpool

u/myro

playing around w polar coordinates

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BuRRak

remix of d/10502 by u/BuRRak

function u(t) {

c.width|=0;for(x.font="5cm a",i=0,x.fillText("🐄",T-120,T%1500);i<32;i+=.02)x.fillRect((T=(960+C(t)*750))+(232-i*-5)*C(i+t*48),i*30,20,20)

Apr 29 2020 2:38 PM UTC

}// 137/140

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Pentagon released 3 UFO videos, so here you have a cow being sucked up by aliens!

u/rodrigo.siqueira

Here are other #alien cow abduction chase: https://www.dwitter.net/d/11115 and https://www.dwitter.net/d/1540 #ufo

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rodrigo.siqueira

remix of d/18541 by u/ntsutae

function u(t) {

for(c.width|=y=h=1080;y--;x.lineWidth=7)
s=y**3/h**2+99,d=S(t/3)*y**.8,
x.lineTo(960+C(K=d+t*22)*s,y+S(K+S(t*2)/2)*s)
x.stroke()

Apr 29 2020 2:25 PM UTC

}// 128/140

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Coil Tube #spiral

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Zillatius

function u(t) {

t?a%=4:a=0;q=c.width=10e2;for(r=a,w=0;w<q;w++,r+=0.1/w/a){xn=0.5;for(i=0;i<30;i++){xn=r*xn*(1-xn);i>20?x.fillRect(w,xn*q/2,1,1):0}}a+=0.01

Apr 29 2020 11:33 AM UTC

}// 138/140

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Logistics map zooming back and forth(first dweet)

u/Zillatius

Inspired by https://youtu.be/ovJcsL7vyrk
u/rodrigo.siqueira

Let's add this #bifurcation to our collection.

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Natsumi

function u(t) {

for(i=0,m=x.createImageData(d=c.width=500,d);i<3*d*d;i+=4)m.data[i]=m.data[i+1]=m.data[i+2]=i%(m.data[i+3]=255);
x.putImageData(m,0,0);

Apr 29 2020 4:23 AM UTC

}// 135/140

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not even sure what this is