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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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Xen

remix of d/14840 by u/pavel

function u(t) {

for(c.width=1e3,r=262,k=98;k--;)for(r*=k%2||C(d),n=j=t+k%6?8+k>>1:2;j--;x.arc(480+C(2*t+k),270,r,a=2*d*j+t/4,a))d=22/7/(n-1)
x.fill`evenodd`

Jun 30 2019 10:22 PM UTC

}// 140/140

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shimmer v.s.

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Blacklink

function u(t) {

c.width=w=1920
x.lineWidth=80+S(t)*30
for(var i=0;i<15;i++){
x.beginPath()
x.arc(w/2,540,50+i*75,2*t,2*t+Math.PI,i%2)
x.stroke()
}

Jul 1 2019 8:57 PM UTC

}// 130/140

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Just a simple little plaything

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taupelink

function u(t) {

c.width=500;p=37;a=2+t|0;for(n=0,m=a;++n<=p;)x.fillStyle=R((n-1)%(p-1)?0:255),x.fillText(n,270+(k=40+n)*C(z=m*6.28/p),140-k*S(z)),m*=a,m%=p

Jul 1 2019 1:21 AM UTC

}// 139/140

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Demonstration of Fermat's little theorem. Powers of 2, 3, 4..., modulo 37, arranged around a circle broken up into 37 equal arcs. #math #numbertheory https://en.wikipedia.org/wiki/Fermat%27s_lit…

u/donbright

p is 37?
u/taupelink

Yep, I picked an arbitrary prime number for demonstration purposes
u/donbright

awesp,e

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pavel

remix of d/14826 by u/KilledByAPixel

function u(t) {

for(w=j=c.width|=f=o=>500*C(q=22/7/(3+~~o*5%8))/C((a+t)%(2*q)-q);a=44/7*--j/w;x.arc(960,540,f(t+1)*e+f(t)*(1-e),a,a))e=(t%1)**9
x.fill()

Jun 29 2019 7:03 AM UTC

}// 136/140

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u/13thptr

smooth
u/katkip

wooow
u/KilledByAPixel

I knew pavel would make it better. ;)
u/KilledByAPixel

https://imgur.com/MDGvSaU
u/donbright

amazing

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KilledByAPixel

remix of d/14811 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𭀪🐶𜀻𬠽𫠽🡓𚁴𚡭𚠪𫠫𞐩𚠹𯀰𞱦𫱲𚁭🐵𞰭𛑭𞱸𛡬𪑮𩑗𪑤𭁨👲𚀶𚐯𜰬𮀮𬱴𬡯𪱥𚀩𚑦𫱲𚁸𛡢𩑧𪑮𤁡𭁨𚁫🐱𩐳𚐻𪰭𛐻𮀮𫁩𫡥𥁯𚀱𜠰𚠨𭀥𜐷𚐫𩠨𤰩𛀱𜠰𚠨𭀯𜐷𯀰𚐫𩠨𠰩𚐩𩠽𡠽🠴𚡲𚀴𚐪𡠨𬠨𜰩𚡫𛰹𞐩𚰳𚡲𚀵𚐪𡠨𬠨𜠩𚡫𛰹𞐩𛐶𜀻`.replace(/u../g,'')))

Jun 30 2019 2:22 AM UTC

}// 137/140

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Random Overlapping Spirographs

u/katkip

#compressed but awesome

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joeytwiddle

remix of d/14824 by u/donbright

function u(t) {

c.width=400
d=(r,T)=>x.fillText(T,200+r*S(a=i/1.91),115-r*C(a))
for(i=N=t|0;i>1;i--)
for(N%i||d(60+i,i),k=50;k--;)N%i||d(k,'*')

Jun 29 2019 4:36 AM UTC

}// 127/140

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Prime factors on a clock #primes #math

Show more comments…
u/joeytwiddle

Shouts to donbright and taupelink!
u/joeytwiddle

35, 55, 77, 95, 115 and 119 all draw a lambda
u/katkip

Wow
u/taupelink

yay
u/DataMeta

Noice!
u/joeytwiddle

Oops this shows all factors, not just prime factors
u/donbright

hee hee sorry my description on the original was slightly misleading
u/donbright

you have golfed it down to where you might actually be able to do something only with prime factors
u/donbright

holy smokes... i just realized something. if you express an integer using this method, there are only 2 to the twelfth possible representations, which is 4096
u/joeytwiddle

Even fewer, since 4, 6, 8, 9, 10, and 12 never appear alone
u/joeytwiddle

They all light up at t=13860, after 3.85 hours #waitforit
u/joeytwiddle

For seconds/minutes use S(a=i/9.55) and d(60+i/4,i)
u/joeytwiddle

To see factors of odd numbers only, and quickly: i=N=t*22|1
u/donbright

cool

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KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𬡡𫑥𙐲𝀰𛐱🰨𬠽𫠽🡃𚁱𚠪𫠩𚠹𯀰𛁦👆🐾𝀪𬠨𝠩𚡆𚁲𚀵𚐪𭀪𜠩𚰴𚡲𚀴𚐪𡠨𬠨𜰩𚡴𚠲𚐬𫁩𫡥𥱩𩁴𪀽𬠨𝰩𚰲𞐬𫁩𫡥𥁯𚀹𝠰𚱦𚁓𚐪𝰬𝐴𜀫𩠨𠰩𚠷𚐬𬱴𬡯𪱥𚀩𚐺𨡥𩱩𫡐𨑴𪀨𩡩𫁬𤱴𮑬𩐽𘠣𡡆𡠷𘠬𩡩𫁬𤡥𨱴𚀰𛀰𛀲𩐳𛀲𩐳𚐬𬐽𭀪𞐩`.replace(/u../g,'')))

Jun 30 2019 3:31 PM UTC

}// 140/140

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Random #Spirograph Generator

u/KilledByAPixel

Just give it a few seconds to get going...
u/Xen

nice
u/durian-favored-monster

how do these escape char ones work? is it decoding something? perhaps it is converting every unicode char into two ascii chars?
u/KilledByAPixel

You can replace eval with throw to get the code. Compressed with d/14282

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Blacklink

remix of d/14875 by u/Blacklink

function u(t) {

c.height=h=999
x.lineWidth=35
p=S(.1*t)+1
k=Math.PI
for(i=0;i<50;i++){x.beginPath()
q=k*2/p*(i%p)
x.arc(h,h/2,i*45,q,q+k*2/p)
x.stroke()}

Jul 1 2019 9:45 PM UTC

}// 137/140

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didn't realise very obvious character saving so made it look a bit nicer

u/Xen

yup, still some golf on this one,.. but also it has a nice style, join discord dwitter chat if you wish and we can crush this all the way down so you can build it back up and add more ;), come shout me.
u/Blacklink

I'll consider that when I have some spare time on my hands!

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Xen

remix of d/14838 by u/KilledByAPixel

function u(t) {

for(c.width|=i=187;i--;x.fill())for(x.beginPath(k=3);k--;x.arc(w+(i%17)*w,60+(i/17|0)*w,w/1.7-C(-t*5)*w*.01,a=k*1.57+t*(i%2-.5),a))w=99

Jun 30 2019 9:35 PM UTC

}// 135/140

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quick test

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pavel

remix of d/14781 by u/KilledByAPixel

function u(t) {

P=2*Math.PI
t/=2
p=P/(3+~~t%5)
for(w=j=c.width|=0;j--;x.arc(960,540,500*(1+(C(p/2)/C(a%p-p/2)-1)/(1+1e5**C(P*t))),a,a))a=P*j/w
x.fill()

Jun 29 2019 3:01 AM UTC

}// 135/140

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u/KilledByAPixel

Amazing!
u/katkip

too math for me