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

Please log in (or register) to post a dweet (copy-paste the code somewhere safe to save it meanwhile)


    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

show FPS hide FPS share fullscreen

thorri

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 */

Feb 25 2017 2:18 PM UTC

}// 122/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

show FPS hide FPS share 1 remix fullscreen

rodrigo.siqueira

remix of d/31859 by u/anilalur

function u(t) {

c.style.filter=`sepia()invert(`
t||x.translate(980,540)
++t<4&&x.drawImage(c,~x.fillText('_._',~x.scale(s=1+C(t++)/20,s),0),~x.rotate(t/9))

May 23 2024 9:16 PM UTC

}// 139/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Ammonite galaxy #spiral

show FPS hide FPS share fullscreen

New_Core

function u(t) {

eval(unescape(escape`𭀿𨰮𭱩𩁴𪁼👷🐹𞐺𚁘👙👚🐰𛁁👛𧐩𒡦👡🐾𝀪𣑡𭁨𛡲𨑮𩁯𫐨𚐭𜠊𠐮𬁵𬱨𚁻𮀺𦀫👦𚀩𛁹𞡙𚰽𩠨𚐬𮠺𦠫👦𚀩𯐩𒡦𫱲𚁩👁𛡬𩑮𩱴𪀻𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚀹𝠰𚱷𚡓𚁡𚐪𤀫𠑛𪑝𛡸𚡐𛀵𝀰𚱁𦱩𧐮𮐪𤀬𤀬𤀩𚑐🐲𜀰𛰨𭰫𭰪𠰨𨐽𭀫𪐯𭰩𚱁𦱩𧐮𮠫𭰩`.replace(/u../g,'')))

Nov 25 2024 1:15 PM UTC

}// 139/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Chaotic Trail...

u/UEZ

nice

show FPS hide FPS share fullscreen

rodrigo.siqueira

remix of d/27961 by u/taupelink

function u(t) {

for(i=1e4;i--&&t<5;x.fillRect(80*X,60*Y,(Y/f&1)%2,(X^f))%1)X=i*t%26+1,Y=i/t%18,f=1+(T(X)-C(Y+S(X/9)))**2,f+=C(X)**-7/f,x.globalAlpha=f/8

Jun 12 2023 1:42 PM UTC

}// 136/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

u/Xen

nice style!

show FPS hide FPS share 1 remix fullscreen

SpecialAgent

function u(t) {

a=1103515245,c=12345,m=0x7fffffff,z=t;for(i=111;i--;)z=((a*z+c)%m),g=z&0x3fffffff,z=((a*z+c)%m),h=z&0x3fffffff,x.fillRect(g%1e4,h%1e3,9,9)

Feb 24 2017 8:19 PM UTC

}// 138/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

A pseudo-random number generator. The parameters you see is used in glibc, it gives a good visual on distribution. If you changed m=0x80000000 (m as used in IBM's C/C++) you will quickly see a bias in the randomness. Oh the irony! Here are some other popular parameters you can try: Borland C/C++: a=22695477,c=1,m=0x100000000 Turbo Pascal: a=134775813,c=1,m=0x100000000 Visual Basic 6: a=1140671485,c=12820163,m=0x1000000 Java: a=25214903917,c=11,m=0x1000000000000 Many more: https://en.wikipedia.org/wiki/Linear_congrue… 🕶

Show more comments…
u/iverjo

This is the probably the best PRNG dweet thus far
u/sigveseb

cool stuff
u/issafly

fullscreen it and stare into it like one of those stereograms for the extra special good.
u/SpecialAgent

thanks folks! also the speed is crippled for dramatic effect, change the loop to "for(i=1e3;i--;)" for turbo mode.
u/iverjo

Speaking of stereograms, it would be cool if anyone could create a stereogram dweet
u/SpecialAgent

Sorry for the malformed link to wikipedia, here is the corrected URL: https://en.wikipedia.org/wiki/Linear_congrue…

show FPS hide FPS share fullscreen

Xen

remix of d/10835 by u/magna

function u(t) {

t||(a=Array(w=2e3).fill(0))
x.drawImage(c,0,0,w,w,0,5,w,w)
for(i=w;i--;x.fillRect(i,0,1,5))x.fillStyle=`hsl(${a[i]+=i*C(i/299+t)},99%,50%`

Nov 5 2018 3:48 AM UTC

}// 138/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

u/katkip

#moire

show FPS hide FPS share fullscreen

taupelink

remix of d/15542 by u/taupelink

function u(t) {

r={valueOf:Math.random};x.fillStyle='#'+'F50FF46F0'.substr(n=r*7|0,3),t<7&&x.beginPath(x.fill(x.arc(r*2e3,r*1080,(9+n)**2,q=n*1.57,q+3.14)))

Oct 31 2019 12:54 AM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

d/16390

u/taupelink

I'm liking this color palette

show FPS hide FPS share 1 remix fullscreen

KilledByAPixel

function u(t) {

A=_=>T=S(T*7)||1
B=_=>R=(R*9||.9)%1
for(i=2e3;i--;)x.fillRect(i,t*60,i-960?i<960?A():B():9,1)

Oct 18 2023 4:26 PM UTC

}// 93/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Two Randoms - demo of two tiny ways to generate random numbers

Show more comments…
u/danny@hille.dk

Cool, but both A and B uses a global method (tan or rgb), besides B is the same length as D=_=>Math.random()
u/rodrigo.siqueira

I understand that in this case, A and B are short methods used to obtain predictable (deterministic) results from a pseudo-random number generator (PRNG), unlike the Math.random() method.
u/KilledByAPixel

A uses Math.sin to get values between -1 and 1, B just uses % and returns between 0 and 1. Both have some artifacts but are random enough for many things.
u/KilledByAPixel

danny, you can't control the seed to Math.random() that makes it unusable for many applications. These do use dwitter defines but also can work just as well without, especially method B.
u/Joachim

Interesting... the left seems too uniform while the right looks slightly horizontaly biased. I think B() will be the most helpful for me, thanks!
u/danny@hille.dk

ooooh nice! Thanks for breaking that down 4 me :-)
u/rodrigo.siqueira

Warning: R=0.5; R=(R*9||.9)%1; // In this seed case (R=0.5), the result will always be 0.5 (it's fixed point, "a value that does not change under a given transformation").
u/cantelope

#RNG

show FPS hide FPS share fullscreen

shaneckel

function u(t) {

c.width=1920;for(i=0;i<9;i++){x.fillRect(400+i*100+S(t)*300,400,50,200)}

Feb 19 2017 10:54 PM UTC

}// 72/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

show FPS hide FPS share fullscreen

magna

remix of d/3271 by u/magna

function u(t) {

c.width|=0
for(i=112;i--;'āăćďğĿſǿğěıİŠŠ'.charCodeAt(Y=i>>3)&1<<X&&x.fillRect(X*4+(S(t*3.1)**5+1)*960,Y*4+(C(t*5.3)**7+1)*540,4,4))X=i&7

Jan 2 2025 4:01 PM UTC

}// 136/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Mouse hijack - crispy remix

u/magna

Breakdown: https://ates.dev/posts/2024-12-30-dweet-bitm…