Top dweets of all time

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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batboy

function u(t) {

t==0?p=Array(1920).fill(1):0
for(i in p)Math.random(x.fillRect(i,0,1,p[i]))<.5?p[i]+=10:0
if(p.every(o=>o>1110))p.fill(1),x.fillStyle="#7cf"

Mar 19 2019 2:35 AM UTC

}// 140/140

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andrea270872

function u(t) {

c.width|=r=Math.random
A=[K=500,K,r()*5-2,-r()*10]
P=t?P.map(([i,j,u,v]=e)=>[(i+u)%2e3,j+v,u,v+.1,x.fillRect(i,j,8,8)]):[A]
P[K]?0:P.push(A)

Mar 15 2019 11:30 AM UTC

}// 140/140

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Particle Fountain, variable number of particles, max 500, non-repeating

u/andrea270872

Thanks to LimeLaser for the examples on the use of arrays!
u/katkip

#firework
u/LimeLaser

This is great, I dig it!

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jellyedwards

remix of d/12732 by u/marc8

function u(t) {

c.width=w=320
t%=9
for(i=0;i<w;i++)z=1-(S(k=(i-w/2)/9)/k),x.globalAlpha=z*t/9,x.lineTo(i,1+z*6*t),x.fillRect(i,80,1,70)
x.stroke()

Mar 15 2019 8:25 AM UTC

}// 130/140

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added a bit of animation to it

u/DataMeta

#hiddengem

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katkip

function u(t) {

r=(X,Y,s)=>{x.beginPath(x.stroke()),x.moveTo(X,Y),x.lineTo(X+S(t*2)*s*4,Y-C(t)*s*4);if(s>4)r(X+S(-t)*s*4,Y-C(t)*s*4,s/1.04)}
r(960,540,19)

Mar 10 2019 4:54 PM UTC

}// 138/140

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Buddha meditating

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LimeLaser

remix of d/12626 by u/qm3ster

function u(t) {

r=Math.random
p=t?p.map(([u,v,i,j]=[99,99,1,1])=>[u+i,v+j,i+(960-u)/1e4+r()-0.5,j+(540-v)/1e4+r()-0.5,x.fillRect(u,v,4,4)]):[...Array(99)]

Mar 7 2019 7:30 AM UTC

}// 138/140

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99 Accelerating Particles (thank you qm3ster)

u/LimeLaser

I have been hoping to make a particle system that persists individual positions and velocities for a while now. With the code golfing qm3ster has done, I can finally do it!

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Porpr

function u(t) {

c.width^=0
l=a=0
for(i=0;i<2e3;i++){
a+=2.0944+S(t*0.6)*.004
l+=0.2
x.strokeStyle="DARKRED"
x.lineTo(960+C(a)*l,600+S(a)*l)}x.stroke()

Mar 7 2019 1:36 AM UTC

}// 134/140

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TriangleVortex

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gpolonus

function u(t) {

r=Math.random
w=r()
h=r()
x.beginPath()
x.arc(w*1920,h*1080,50,0,2*Math.PI)
x.fillStyle=R(255*w,255*h,255,0.5)
x.fill()

Mar 5 2019 4:22 PM UTC

}// 119/140

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Raindrops

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Nexrem

function u(t) {

c.width^=0;e=Math.floor;z=950;for(i=0;i<2000;i++){x.moveTo(z+C(i)*z,540+S(i*e(t))*540);x.lineTo(z+C(i+1)*z,540+S((i+1)*e(t))*540)}x.stroke()

Mar 5 2019 12:17 AM UTC

}// 140/140

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u/lionleaf

Nice one! Welcome to Dwitter :)
u/rodrigo.siqueira

Same result with just 77 characters, using ~~ instead of Math.floor; No need to x.moveTo; c.width can be together with other elements to avoid "0" in "^=0" and other shortcuts: for(c.width^=i=0;i<2e3;i++)x.lineTo(950+C(i)*950,540+S(i*~~t)*540);x.stroke()
u/Xen

Love it

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katkip

function u(t) {

f=(X,Y,s)=>{x.fillRect(X+S(s+t)*(s+t),Y+C(s+t)*(s+t),s/59,s/59);if(s>1)f(X+S(s)*s*t/2,Y+C(s)*s*t/4,s-1)}
f(1590,750,150)

Mar 3 2019 7:15 PM UTC

}// 120/140

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Awesome abstract wallpaper #recursive

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Xen

remix of d/12582 by u/nini1294

function u(t) {

c.width|=0,x.translate(960,540)
for(i=59;i--;x.arc(C(t*17+i/7)*9,S(t*9+i/2)*9,19*i,0,x.lineWidth=7))x.beginPath(x.stroke())

Mar 1 2019 5:35 PM UTC

}// 123/140

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u/katkip

Once I had eyes