Random dweets | Dwitter

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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andrea270872

remix of d/28279 by u/rodrigo.siqueira

function u(t) {

with(x)for(fillRect(0,0,w=2e3,i=w);i--;strokeRect(960-i/2,540-i/2,i*2,i))setLineDash([i,99,i]),strokeStyle=R(lineDashOffset=w+i*t,w)

Aug 13 2023 8:28 AM UTC

}// 132/140

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just playing around with the params and the shadows

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magna

remix of d/32609 by u/skeletonNatte

function u(t) {

for(i=c.width=256;i<4e4;)x.fillRect(i&255,i++>>8,Math.random(),1)

Oct 21 2024 5:24 PM UTC

}// 65/140

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smoller TV static

u/magna

anyone care to throw in a PRNG to replace Math.random()?
u/lewdev

Nice, you had me beat by 1b with i++>>8!

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username

remix of d/12964 by u/katkip

function u(t) {

for(i=999;i--;s=9)with(x)fillStyle=`hsl(${i/t*2},99%,50%)`,beginPath(),fill(arc(960+C(i*t/18)*t*99,540+S(i*t/18)*t*99,9+i/5,0,7))

Apr 3 2019 3:33 PM UTC

}// 129/140

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golfed btw #waitforit

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lewdev

remix of d/28796 by u/lewdev

function u(t) {

c.width=A=1e3
with(x)for(i=90,font="1cm'";i--;)save(),translate((i%9+1)*99,-50+(i/9*99+t*99)%A),rotate(i+t*3),restore(fillText("😆",-28,12))

Nov 6 2023 8:49 AM UTC

}// 139/140

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😆 Rotating on the Canvas Laughing (this performs poorly on Firefox, not sure why)

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Agnes

remix of d/8945 by u/firegodjr

function u(t) {

F=n=>{return C(n)*C(n)+S(n)*S(n)<1}
x.drawImage(c,0,l=10)
for(j=214;j--;)x.fillStyle=F(j^t*60)?"#0f0":"#000",x.fillRect(j*l,0,l,l)

Jul 28 2018 8:15 PM UTC

}// 130/140

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Visualising numbers for which sin(x)*sin(x) + cos(x)*cos(x) < 1.

u/donbright

wait wait wait wait wait.... sin^2 + cos^2 = 1. im so confused. is this about the imprecision of floating point arithmetic?
u/donbright

this is absolutely fascinating... set it ==1 or >1 gives different patterns.
u/donbright

also fun... return S(n)/C(n)==T(n)

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Xen

remix of d/9146 by u/katkip

function u(t) {

x.fillRect(0,0,Z=2e3,Z)
for(i=Z;i--;x.fillRect(i,Z*C(S(2*t|0)*i+t),99,i/9))x.fillStyle=`hsla(${199*t+i/4},99%,50%,.2)`

Aug 6 2018 7:27 PM UTC

}// 118/140

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u/magna

#keepsongiving
u/d0n.key

This created some kind of music in my mind o.O.o
u/katkip

Images you can hear

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KilledByAPixel

function u(t) {

F=_=>(1-X%1)*S(X^Y)*3+X%1*S(X+1^Y)*3
B=t*9,A=B**5%2e3
for(k=1e3;k--;x.fillRect(A+=C(b=F(Y=B/99)*(1-Y%1)+Y%1*F(Y++)),B+=S(b),.5,1))X=A/99

Jun 19 2021 3:04 PM UTC

}// 136/140

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Flow Field

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Xen

remix of d/14933 by u/username

function u(t) {

x.drawImage(c,0,7);for(j=2e3;j--;x.fillRect(j,0,j,7))x.fillStyle=`hsl(${2e2*t^j},61%,50%)`

Jul 7 2019 9:35 PM UTC

}// 90/140

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#rainbow #xor

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trupples

remix of d/5632 by u/trupples

function u(t) {

c.width|=0
for(i=N=5e2;i-=22;)with(x)beginPath(),V=i=>960+C(a=2.4*i+t)*1e3*(i/N-i*i/N/N)**.5,moveTo(V(i),2*i),lineTo(V(i+=21),2*i),stroke()

Jan 6 2018 4:07 PM UTC

}// 139/140

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Jenky

function u(t) {

t||(n=c.cloneNode(0),c.parentNode.replaceChild(n,c),g=n.getContext("webgl"))
g.clearColor(.7+.3*S(t*4),0,0,1)
g.clear(16384)

Apr 19 2017 9:49 AM UTC

}// 124/140

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WebGL, anyone? :D

u/Jenky

Kinda sucks it takes so many bytes to set up, anyone have ideas to shorten?
u/magna

Just keep drawing the new, off-screen canvas onto the existing 2D context seems to work (though, is probably inefficient): https://www.dwitter.net/d/2535