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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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BirdsTweetCodersDweet

function u(t) {

t?0:s=0;for(c.width|=a=1e3;a--;x.stroke())x.beginPath(),x.ellipse(900+200*C(a),500+200*S(a),100+50*S(a+s),100+50*C(a),0,0,7),s+=1e-4

Feb 2 2018 11:41 PM UTC

}// 132/140

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A torus-like shape made of sin and cos spinning in 3D space. Credit to u/Xen for golfing.

u/BirdsTweetCodersDweet

Better with transparency, but 148 bytes -- t?0:s=0;for(c.width|=a=1e3;a--;x.beginPath(x.globalAlpha=.5))x.ellipse(960+200*C(a),540+200*S(a),90+30*S(a+s),90+30*C(a),0,0,7),x.stroke(),s+=1e-4
u/BirdsTweetCodersDweet

I'm done --- t?0:s=0;for(c.width|=a=1e3;a--;x.stroke(),x.globalAlpha=.5)x.beginPath(),x.ellipse(960+200*C(a),540+200*S(a),90+30*S(a+s),90+30*C(a),0,0,7,x.strokeStyle=R(255*S(a)+255,255*C(a)+255,100+10*C(a))),s+=1e-4 --- 202 bytes, but full with colors and stuff, except for a weird bright area(?)... I dunno, see you all tommorow, I'm off to sleep :P
u/akm

I golfed it to 134 chars with transparency. for(c.width|=a=1e3;a--;)with(x)ellipse(960+200*C(a),540+200*S(a),90+30*S(a+t*6.2),90+30*C(a),0,0,7),stroke(),beginPath(globalAlpha=.5)
u/BirdsTweetCodersDweet

Solved the weird colors --- t?0:s=0;for(c.width|=a=2e3;a--;x.stroke(),x.globalAlpha=.5)x.beginPath(),x.ellipse(960+200*C(a),540+200*S(a),90+30*S(a+s),90+30*C(a),0,0,2*Math.PI,x.strokeStyle=R(255*S(a)+255,255*C(a)+255,100+10*C(a))),s+=1e-4

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akm

remix of d/6663 by u/Anthorouss

function u(t) {

c.width=1920
for(i=140,l=500;i--;x.lineTo(m,k+10))n=S(t-i/4)*3e2,x.arc(m=i*18-120,k=-n+l,30,0,6.283,x.moveTo(m+220,n+l))
x.fill()
x.stroke()

Feb 2 2018 10:12 PM UTC

}// 140/140

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marc8

function u(t) {

c.width|=0
for(i=0;i<9;i++){
x.fillStyle=`hsla(${i*25},100%,50%,.5)`
x.fillRect(Math.max(500,Math.min(1300,(i+5)*100+S(t)*800)),400,50,200)}

Feb 2 2018 6:02 PM UTC

}// 140/140

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u/lionleaf

Always fun with remixes of the default dweet! Nice one!
u/f8f82804

#default

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21medals

remix of d/6619 by u/21medals

function u(t) {

for(c.width|=i=80,x.globalCompositeOperation="xor";i--;x.ellipse(960,r=540,(S(t+S(i)/2)*r+r)/8,r,t/4+.0785*i,0,6.28),x.fill())x.beginPath()

Feb 1 2018 10:28 PM UTC

}// 140/140

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Jezza

function u(t) {

c.width|=0;s=120;x.fillStyle='red';for(m=1920;m-=s;)for(n=s*9;n-=s;)x.moveTo(m,n),x.ellipse(m,n,S(z=t+m)*20+40,C(z)*20+40,z+n,0,7);x.fill()

Feb 1 2018 9:42 PM UTC

}// 139/140

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Jelly Beans?

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DirtyDan

remix of d/6614 by u/akm

function u(t) {

for(i=0,c.width=1920,π=Math.PI*2,r=540;i++<180;a=3*i*S(t),x.ellipse(960,r,a<0?-a:a,r,1.5*i*π/9+i/180*π*t,π*C(t),π),x.stroke())x.beginPath()

Feb 1 2018 3:02 AM UTC

}// 139/140

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BackendForth

function u(t) {

c.width=1920
r=C(t)/2+.5
for(i=-5;i<5;i+=.1)for(a=-19;a<19;a+=.1){j=a**3
h=(1-r)/(i*i+j*j)
x.fillRect((r+h)*i*299+960,(r-h)*j*299+540,9,9)}

Jan 28 2018 10:38 PM UTC

}// 139/140

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u/joeytwiddle

Are these lines crooked? ;-)
u/BackendForth

Not with respect to the complex projective plane?

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41407

function u(t) {

c.width|=0;a=~t%5==0?Math.random():0;l=100;for(i=9;i--;)for(j=2;j--;x.fillRect(4*l+i*l+S(t+j*a)*3*l,4*l+l*j,50,l));x.drawImage(c,i,T(t*a)*9)

Jan 27 2018 1:10 PM UTC

}// 140/140

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u/Qwitter

Dang me dwitters on the fritz again!
u/41407

I am not good with computer
u/Leodude123

?

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BackendForth

function u(t) {

if(!t||a<0||b<0||a>1920||b>1080)p=t,a=960,b=540,x.beginPath()
p+=t*4
a=a+C(p)*19
b=b+S(p)*19
x.lineTo(a,b)
x.stroke()

Jan 27 2018 12:32 AM UTC

}// 117/140

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u/aleamb

nice!
u/Qwitter

Pretty

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donbright

remix of d/6294 by u/nickd3000

function u(t) {

Q=(x,y)=>x*x+y*y
for(i=N=128;i--;)for(j=N;j--;)B=Q((半=64)-i,半-j-S(t/3)*半),G=Q(半-i-C(t)*半,半-j),x.fillStyle=R(B%G,G%B),x.fillRect(i*8,j*8,8,8)

Jan 23 2018 4:35 AM UTC

}// 140/140

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note to future self... this is some kind of weird combination of interference patterns between waves, and circle-squares fractals ....to see whats going on, start out with fillstyle=R(B%256,0,0) then work from there.

u/donbright

note to future self... this is some kind of weird combination of interference patterns between waves, and circle-squares fractals ....to see whats going on, start out with fillstyle=R(B%256,0,0) then work from there.
u/donbright

in other words, it's not drawing the "lines of force", those lines are an artefact of the remainders of the 'quadrance' (squared distance) between the two black balls