Dwitter - javascript demos in 140 characters

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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KilledByAPixel

remix of d/22883 by u/tomxor

function u(t) {

t?t*=180:X=Y=Z=R=8
for(a=S(R),b=C(R),p=2e3;p--;x.fillRect(p,t,2-8/T,T=3))for(A=p/1e3-1,B=t/800;(X-T*a^Y+T*B^Z+T*(A*b-A*a-b))%15>1;T+=T/99);

May 28 2021 5:33 PM UTC

}// 139/140

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Dweetcraft HD Render ⛏️

Show more comments…
u/KilledByAPixel

I just now realize the t? part isnt necessary
u/taupelink

whoa
u/KilledByAPixel

More golfed: for(a=S(8),b=C(8),p=2e3;p--;x.fillRect(p,t*480,2-8/d,8))for(d=3;(8-d*a^8+d*t^8+d*((p/1e3-1)*(b-a)-b))%15>1;d+=d/99);
u/Toby

what is this sorcery?!
u/rep_movsd

Even this dweet got 100x faster
u/tomxor

#raymarching

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initramfs

remix of d/22850 by u/New_Core

function u(t) {

for(i=a=500;i--;x.fillRect(960+(t*t*C(i*9.97+t)+a*S(v=i>>4)*3)*Z,800+(200-t*100)*Z,Z*9,Z))Z=199/(i%a+a/9),x.fillStyle="#105"

May 31 2021 5:38 AM UTC

}// 125/140

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taupelink

remix of d/22662 by u/taupelink

function u(t) {

for(i=k=300;i--;x.fillRect(k*X,k*Y,e/t*d,i*d))f=997*i*t,X=f*f%7,Y=X*f%4,e=2**(2**(Y*f%7-4)),x.fillStyle=R(e*(1.5+C(e%Y*X)/6),e,e*.7,d=.4**t)

Jun 1 2021 5:59 PM UTC

}// 140/140

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d/22959

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initramfs

remix of d/22606 by u/Agnes

function u(t) {

for(f=q=200;--q;)for(y=110;--y;x.fillRect(10*q,10*y,9,8))x.fillStyle='#'+(''+~~(q*y*t*f++)%(3**20)).padStart(1,'1')

May 31 2021 5:55 PM UTC

}// 115/140

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Agnes

remix of d/22606 by u/Agnes

function u(t) {

for(f=0,q=480;--q;)for(y=270;--y;x.fillRect(4*q,4*y,4,4))x.fillStyle='#'+(''+~~(q*y*t*f++)%(2**24)).padStart(6,'0')

May 31 2021 5:17 PM UTC

}// 115/140

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Higher-res (2.5x in both directions) "rippling through colour space" to match the recent performance increase

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initramfs

remix of d/4214 by u/lowpoly

function u(t) {

(s=>{for(a=0;a<2000;a+=s)for(b=0;b<=500;b+=s)x.fillRect(a,b,s*S(b+t),s*S(a+t),x.fillStyle=`hsl(${a+b*S(t)},100%,50%)`)})(10,c.width=920)

May 31 2021 3:58 PM UTC

}// 136/140

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KilledByAPixel

remix of d/22883 by u/tomxor

function u(t) {

for(c.width=w=64,a=S(t),p=3e3;B=p--/1e3;x.fillRect(p%w,p/w,2-7/T,T=1))for(A=p%w/32-1;(9-T*A-T*a^t*9+w+T*B|6-T*A*a+T)%15>1;T+=.1);

May 28 2021 10:49 PM UTC

}// 129/140

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Voxel Descent ⛏️

u/KilledByAPixel

More golfed... for(c.width=w=64,p=3e3;p--;x.fillRect(p%w,p/w,2-7/T,T=1))for(A=p%w/32-1;(9-T*A-T*R^t*9+w+T*p/1e3^6-T*A*R+T)&3;T+=.1)R=S(t)
u/tomxor

#raymarching

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initramfs

remix of d/22926 by u/New_Core

function u(t) {

for(w=c.width|=i=a=560;i--;x.fillRect(460+(1*S(t*.1)+w*S(i>>99))*Z,a+999*C(t*1.4)*Z,Z*a,Z*a))Z=199/(i%w+w/7+001*S(t*.9)),x.fillStyle="#37f1"

May 31 2021 3:09 PM UTC

}// 140/140

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davidsover

function u(t) {

a=_=>Math.random()*256
x.fillStyle=R(a(),a(),a())
x.rotate(0.07)
for(i=5000;i--;)x.fillRect(T(i+t*t)*10 + 700,C(i+t*4)*100,1200,100);

Jun 1 2021 10:48 AM UTC

}// 133/140

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Color Sweeps

u/davidsover

Replace the 1200 with a 1 to simulate the inside of a black hole

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taupelink

remix of d/22895 by u/taupelink

function u(t) {

r=997*t;e=4**(r*r%3+3);X=e*r%9;Y=X*r%4;x.fillStyle=R(e**(a=1+C(Y*.8)),e*a,e/a,1/t);x.fillRect(X*250,Y*400,-5*e*.8**t,-5e4/e*.9**t)

May 30 2021 5:17 PM UTC

}// 130/140

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d/22905