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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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cshadows

remix of d/2466 by u/miohtama

function u(t) {

w=(c.width|=0)/2
x.fillStyle="#f80"
for(i=2e3;i--;x.fillRect(w+S(p=t*i)/(Z=4+C(p)*(h=1+S(i/99-t*4)/2))*w*h,540+1/Z*(i-999)*w/300,s=40/Z,s));

May 28 2020 11:50 PM UTC

}// 140/140

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Foldster

remix of d/18941 by u/Foldster

function u(t) {

for(i=a=b=-100;i<99;i++)
{r=t**i%3
a=(r>2)+a/2+b/3
b=(r<1)+b/2
s=1e3/t
x.fillStyle=R(v=5*t,v,v)
x.fillRect(9e2*b+(2-a)*150,5e2*a+s,2*i/t,s)}

May 23 2020 8:32 PM UTC

}// 140/140

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Faster Moonlit Mountains

u/Foldster

Huh that's actually really weird. The moon renders differently on my phone and on my computer
u/Xen

nice!

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andrea270872

remix of d/18929 by u/Ectomorphed

function u(t) {

c.width|=0
x.font="25px'"
for(i=0;i<96;i++)
for(j=0;j<55;j++)
(S(4*t*j+i)+1)<0.5?x.fillText("⟋",i*20,j*20):x.fillText("⟍",i*20,j*20)

May 22 2020 6:08 PM UTC

}// 132/140

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Less random, more structure (perhaps?) :)

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nikoloffgeorgi

function u(t) {

c.width|=[...'qwyo'].map(a=>this[a]=this[a]||40);v=1040
q+=y*=.992,w+=o+=4
q>1880|q<=0&&(y=-y)
w>v&&(w=v,o=-o*.925)
x.fillRect(q,w,40,40)

May 22 2020 3:39 PM UTC

}// 137/140

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trying a technique to preserve state between frames

u/joeytwiddle

How about this? t?0:(q=w=y=o=40)
u/nikoloffgeorgi

really elegant!

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smtsjhr

remix of d/18891 by u/smtsjhr

function u(t) {

a=5
for(i=150;i--;x.fillStyle=R(w=i%2*255,w,w,.8)){d=115*(k=(1.015)**(i));
x.fillRect(960+100*S(i*(.6+.5*S(a))+2*t)*k-d/2,540-d/2,d,d)}

May 21 2020 9:22 PM UTC

}// 135/140

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set a = some const for looped pattern

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katkip

remix of d/18885 by u/Xen

function u(t) {

f=frame,w=c.width/t+f
x.fillStyle=R(f*f-t**t,t*t,f*t)
x.beginPath(),x.arc(w+f+w*S(f),w+w/t*C(f),f*S(t)/t-t*S(t),t,f),x.fill(),x.stroke()

May 21 2020 7:36 AM UTC

}// 136/140

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#NoNumbers

u/Xen

nice!

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Foldster

function u(t) {

for(i=-1;i<1;i+=.01){
[a,b]=t?[d=(2e3*(a*b%2<1)-a-b)/2,a+d]:'00'
s=2e4/t/t
x.fillStyle=R(0,450/t**.4,s)
x.fillRect(800+a,b+s,i*s,2)}

May 21 2020 5:38 AM UTC

}// 132/140

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Fractal Hills 2

u/bandaloo

looks like something submerged in water
u/Foldster

Yeah it's like an archipelago
u/Foldster

Let it play out and the islands become much more defined
u/Foldster

Like this is what I was going for https://www.worldatlas.com/r/w1200-h701-c120…
u/bandaloo

nice! comes pretty dang close to the source image

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AOctavio

remix of d/18824 by u/AOctavio

function u(t) {

c.width=1920;for(i=0;i<99;i++)x.fillRect(-54+i*40,600+300*S(t+i*6.2),500,20);for(z=0;z<99;z++)x.fillRect(-54+z*40,600+300*C(t+z*6.2),500,20)

May 17 2020 9:39 AM UTC

}// 140/140

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nyooom

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smtsjhr

function u(t) {

for(j=140;j--;x.fillStyle=R(w=j%2*255,w,w,.5))x.fillRect(960+(z=C(t/100)*C(a=j-j%2)*(k=1.03**a)-(d=10*k*(j%2+5*S(j*t/10)))/2),540+z,d,d)

May 17 2020 8:32 AM UTC

}// 136/140

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rafroller

remix of d/18780 by u/rafroller

function u(t) {

u=t;
c.style.filter='invert()';for(i=0;i<10;){for(j=0;j<6;)x.fillRect(60*C(u*j)+211*i-99,60*S(u*i*1.01)+212*j-99,2,2),j++;i++}

May 14 2020 7:30 PM UTC

}// 126/140

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I really like this variation