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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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Bugsy

function u(t) {

for(c.width|=r=999;--r;x.lineTo(960+C(r+t)*a,540+S(r+t)*a))a=r/2
x.stroke()

Jun 16 2018 4:32 PM UTC

}// 75/140

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The graph r=theta spinning around the origin. 65 characters to play with, so there's lots of remixing potential. Try messing around with the trig functions, it leads to some fun results

u/iverjo

Go fullscreen, stare at the center for 30 seconds, then look away from your screen (e.g. look at your keyboard). #opticalillusion
u/iverjo

#short

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lazyguyy

function u(t) {

                       t*=6.27;a=(2+C(5*t));b=a*S(3*t);a*=C(3*t);x.fillStyle=R(a*100,b*100,255-a*100);x.fillRect(960+a*280,540+b*170,15,15)

Jun 12 2018 2:51 PM UTC

}// 139/140

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simple colorful torus knot

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pythech

remix of d/8540 by u/pythech

function u(t) {

x.beginPath()
x.fillStyle=R()
c.width|=0
for(i=500;--i;) {
x.arc(S(k=i*1044+t)*C(i)*400+900,C(k)*400+500,19,0,9)
}
x.fill()

Jun 11 2018 6:52 PM UTC

}// 123/140

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alien

function u(t) {

W=c.width=7e2
x.font='13px l'
for(i=0;i<35;i++){
 for(j=0;j<29;j++){
 V=(frame>>3)+i*j+i+j
 x.fillText(String.fromCharCode(V),i*13,j*13)
}
}

Jun 9 2018 9:42 PM UTC

}// 140/140

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DirtyDan

function u(t) {

a=360
with(x)for(i=-1;i++<1;)for(j=0;j++<17;beginPath())arc(960,a+a*i,b=j*20,i?33/7:11/7,i?0:22/7,1),stroke(),fillRect(598+b+i*a,a,3,a)

Jun 9 2018 4:48 AM UTC

}// 135/140

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Wanted to fit a thicker line width in but I didn't see a way to. I think it looks okay anyway.

u/DirtyDan

Inspired by: https://old.reddit.com/r/GeometryIsNeat/comm…
u/pythech

it is possible, remixed it with the thicker lines
u/pythech

the trick is x.lineWidth
u/DirtyDan

Yeah, I just couldn't fit it in 140 chars

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robbyg

function u(t) {

t||(X=[...Array(50).keys()],Y=[...X]);for(i=50;i--;)h=X[i],x.fillRect(X[i]=950+(S(1*Y[i])-C(2*h))*440,Y[i]=550+(S(3*h)-C(4*Y[i]))*230,5,5)

Jun 8 2018 5:53 PM UTC

}// 138/140

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Peter de Jong attractor. Changing the 1, 2, 3, 4 multipliers in the sine/cosine functions changes the shape.

u/robbyg

#attractor
u/rodrigo.siqueira

Robbyg, here is a smaller version with higher resolution. Same equation, no need to create array: t||(h=X=Y=0);for(i=950;i--;) X=950+(S(1*Y)-C(2*h))*440, Y=550+(S(3*h)-C(4*Y))*230, h=X,x.fillRect(X,Y,1,1)

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magna

remix of d/8479 by u/magna

function u(t) {

t||(d=c.cloneNode()).getContext`2d`.fillText('🐱',0,15)
s=55
for(i=1e3;i--;x.drawImage(d,X=i&31,Y=i>>5,1,1,X*s+580,Y*s,s,s))x.rotate(C(t))

Jun 7 2018 4:06 AM UTC

}// 138/140

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If you wait long enough on macOS, it starts looking like you've zoomed into a gold-plated torus.

u/Qwitter

when you fail to cross off enough "post it note" to do reminders?

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veubeke

remix of d/8423 by u/veubeke

function u(t) {

r=Math.random
for(a=2e3;a--;x.fillRect(a,b,9,9))b=r()*960,$=b/30-S(a/300),x.fillStyle=R(0,0,($>20?13-($>r()*30)*9:(a|b<<11)%101?r()+2:9)*50)

Jun 5 2018 5:10 PM UTC

}// 140/140

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u/DataMeta

Neat. I see a starry night in the desert
u/aleamb

great!!!
u/iverjo

Looks a little bit like ISO noise from a digital camera ^^

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DataMeta

remix of d/8405 by u/DataMeta

function u(t) {

c.width=1920;p=Math.PI;r=Math.random();for(i=0;i<300;i++){x.fillRect(960+p*i*S(t+i*.9),540+S(t/7+i/p)*i*1.55925,T(t/2)*r*2+2,T(t+i)*r*2+2)}

Jun 5 2018 3:11 AM UTC

}// 139/140

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fireflies glitching

u/DataMeta

#glitch

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DataMeta

remix of d/8027 by u/cesque

function u(t) {

c.width|=0;p=Math.PI;x.lineWidth=60;for(i=1;i<20;i++){x.beginPath();x.arc(960,540,50+(i*50)+S(t+i/p)*50,t+(i*3)+S(t),t/i+(i*p));x.stroke()}

May 24 2018 7:24 PM UTC

}// 139/140

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u/joeytwiddle

What is it? Is it trying to share its technology, or eat us?
u/DataMeta

Haven't been able to evoke a response from it. It just keeps broadcasting this signal.