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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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qm3ster

remix of d/12153 by u/LimeLaser

function u(t) {

r=Math.random;p=t?p.map(([a,b,f=R(0,a/8,b/4)]=[1920*r(),1080*r()])=>[a+4-8*r(),b+4-8*r(),x.fillStyle=f,x.fillRect(a,b,2,2)]):[...Array(999)]

Mar 5 2019 3:25 PM UTC

}// 140/140

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#golfed added colors instead

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u/qm3ster

Colors correspond to starting position. Horizontal speed is now equal to vertical.
u/f8f82804

This might be one of the best #random dweets I've ever seen! Gorgeous!
u/LimeLaser

This is awesome!
u/pavel

131 for(r=Math.random,i=1e3;i--;x.fillRect(S[i]+=4-8*r(),C[i]+=4-8*r(),2,2))S[t]=2e3*r(),C[t++]=1080*r(),x.fillStyle=R(0,S[i]/8,C[i]/4)
u/qm3ster

@pavel why do you use 2e3 as approximation for 1920 but not 1e3 as approximation for 1080? It's not like they're used as bounds.
u/qm3ster

@pavel it doesn't persist the colors of the particles, so it just paints the whole c a gradient.
u/pavel

Ah, I didn
u/pavel

I didn't catch the color change, it does complicated the code: 138 for(r=Math.random,w=i=2e3;i--;x.fillRect(S[i]+=4-8*r(),C[i]+=4-8*r(),2,2))c[t]=S[t]=w*r(),x[t]=C[t++]=w*r(),x.fillStyle=R(0,c[i]/8,x[i]/4)
u/pavel

2e3 overruns and you can't see it. 1e3<1080 so the bottom has more whitespace and it looks bad.
u/pavel

135 for(r=Math.random,w=i=2e3;i--;x.fillRect(p[0]+=4-8*r(),p[1]+=4-8*r(),2,2))p=u[i]=t?u[i]:[a=w*r(),b=w*r(),R(0,a/8,b/4)],x.fillStyle=p[2]
u/pavel

134 for(r=Math.random,w=i=2e3;i--;x.fillRect(p[0]+=4-8*r(),p[1]+=4-8*r(),2,2))p=u[i]=u[i]||[a=w*r(),b=w*r(),R(0,a/8,b/4)],x.fillStyle=p[2]
u/pavel

This does look great :), not sure what else to add with the spare chars
u/qm3ster

Nice! I limited it to 100 particles, each gets 20 movements per frame now:
u/qm3ster

for(r=Math.random,w=i=2e3;i--;x.fillRect(p[0]+=2-4*r(),p[1]+=2-4*r(),2,2))p=u[z=i%100]=u[z]||[a=w*r(),b=w*r(),R(0,a/8,b/4)],x.fillStyle=p[2]

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pavel

function u(t) {

for(c.width=120,k=4072;j=--k>>6;x.fillRect(60+i,j,1,1))i=k%64-32,s=64*j-i*i-j*j,f=s**.5*S(a=S(3*t))+i*C(a),x.fillStyle=R(g=f*f/4,g,g+f,s/99)

Mar 3 2019 3:17 AM UTC

}// 140/140

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u/aleamb

#shading
u/13thptr

#sphere

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geb

remix of d/12310 by u/geb

function u(t) {

for(c.width|=i=99;i--;x.rect(~r,~r,2*r,2*r))r=(i-1*t%8)*24,r*=r>1,x.setTransform(~3,~0,~1,1,9,9),x.rotate(t-r/666);x.fill('evenodd')

Feb 26 2019 10:24 PM UTC

}// 132/140

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in or out ?

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21medals

function u(t) {

for(c.width|=i=18,x.lineWidth=9;i--;)x.lineTo(960+S(q=t+(i+(i>8?-1:1)>>1)*1.57)*460*(d=1+C(q)/4),540+((i%4&2)-1)*(320+C(q)*99*d))
x.stroke()

Feb 24 2019 7:11 PM UTC

}// 140/140

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Just for practice

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magna

remix of d/12417 by u/DataMeta

function u(t) {

for(i=1e3;i--;)x.fillRect(i*2,t*99,r=t+S(i*333)*C(i*777)<8&&6*Math.random(),r)

Feb 20 2019 6:39 AM UTC

}// 78/140

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Starlit sky on alien planet

u/DataMeta

Ooh, nice
u/katkip

Haha, nice idea
u/rep_movsd

#underrated

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katkip

remix of d/12348 by u/katkip

function u(t) {

x.fillRect(0,0,2e3,1e3);x.globalAlpha=.1;t||(a=b=5);for(i=599;i--;)a+=S(b+C(a)),b+=C(a+C(b+t*i)),x.clearRect(a*590-1800,b*290-300,i/99,i/99)

Feb 16 2019 7:56 PM UTC

}// 140/140

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Chaotic #attractor in motion but more designed

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anotherkitten

function u(t) {

for(c.width|=i=128;i--;x.fill(p=new Path2D,p.arc(i*16,b,Math.abs(S(i/9+t/2)*40),0,8)))x.fillStyle=`hsl(${b=620+C(i/2-t)*90} 70% 40%`

Feb 13 2019 3:36 PM UTC

}// 132/140

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rodrigo.siqueira

function u(t) {

Xp=X=Y=t/800
x.globalAlpha=.1
for(i=2e3;i--;){
X=Xp*Xp-Y*Y+.9*Xp-.6013*Y
Y=2*Xp*Y+2*Xp+.5*Y
Xp=X
x.fillRect(1300+X*820,740+Y*400,2,2)
}

Feb 9 2019 3:14 PM UTC

}// 135/140

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Tinkerbell Map is a chaotic #attractor dynamical system, as described in https://en.wikipedia.org/wiki/Tinkerbell_map

u/rodrigo.siqueira

"Origin of the name: the graphical picture shows a similarity to the movement of Tinker Bell over Cinderella Castle, as shown at the beginning of Disney films."
u/katkip

You can replace Xp with p

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joeytwiddle

function u(t) {

for(c.width|=i=999;i--;)a=i-t,h=i/580-.25,r=(h<1.2)*150+(h>0&&h<1)*400*S(h*3),x.fillStyle='#e'+i,x.fillRect(960+r*S(a),50+i+r*C(a)/5,70,30)

Feb 4 2019 3:17 PM UTC

}// 139/140

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Gong xi fa chai!

u/katkip

#cute
u/joeytwiddle

Happy Chinese New Year of the Pig!

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katkip

function u(t) {

c.width*=1;s=5;x.translate(950,540);for(i=200;i--;)x.strokeRect(-i*s,-i*s,i*s*2,i*s*2),x.rotate(T(t/2)/99)

Feb 2 2019 5:33 PM UTC

}// 106/140

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Spinning

u/cantelope

dem moiré patterns!
u/katkip

#moire