Hot dweets by u/joeytwiddle

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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joeytwiddle

remix of d/16160 by u/katkip

function u(t) {

for(i=1920;i--;)y=69*t,Z=690/y,X=(i-960)*Z,x.fillRect(i,y+30*S(S(X/89+Z*11)*C(X/79-Z*6)+C(X/69+Z*9))/Z,.2,1/Z**.69)

Oct 27 2019 7:16 AM UTC

}// 115/140

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joeytwiddle

function u(t) {

f=n=>200*C(Math.PI*t/n)**98
s=(Math.round(t)-t)**2<.0002
x.fillText(s?Math.round(t):'|',t*50,9+f(1)+f(2)+f(3)+f(5)+f(7)+f(11)+f(13)+f(17))

Oct 24 2019 7:08 AM UTC

}// 138/140

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It was supposed to find primes but it doesn't

u/joeytwiddle

because primes divide themselves! (Better in fullscreen)
u/joeytwiddle

Perhaps if we don't add f(N) until prime N is found... also needs a sharper f
u/joeytwiddle

It's an analogue Merseinne seive, using smooth spikes for repetition

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joeytwiddle

remix of d/9574 by u/katkip

function u(t) {

for(i=0;i<2e2;i++)x.fillStyle=`hsla(${i*2+t*99},${99*S(t/i)}%,50%,.03)`,x.fillRect(960+S(t)*9*i,540+C(t)*9*i,i*C(i/t),i*C(i+t))

Oct 3 2019 5:39 AM UTC

}// 127/140

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Smudge and shine

u/joeytwiddle

Not a patch on d/9008 tho
u/joeytwiddle

#shiny

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joeytwiddle

remix of d/3247 by u/joeytwiddle

function u(t) {

x.fillStyle='#000',x.fillRect(0,0,1920,1080),X=960+1200*C(t)
x.fillStyle=R(255,X/9,0),x.beginPath(),x.arc(X,1100-600*S(t),199,0,7),x.fill()

Sep 13 2019 3:14 PM UTC

}// 139/140

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Happy Mid-Autumn Festival!

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joeytwiddle

remix of d/15127 by u/veubeke

function u(t) {

c.width|=0;x.font='9em"';['🌾','🐄','🥩','🍔','💩'].map((C,j)=>{for(i=12;i--;)X=((i+t)%12)-6,x.fillText(C,900-(1-2*(j%2))*X*192,160+220*j)})

Jul 24 2019 1:37 PM UTC

}// 135/140

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u/donbright

vegetarian version would be a lot less rows
u/veubeke

:D
u/iverjo

It's the ciiiircle of liiiiiiiife, and it moves us aaaaall
u/joeytwiddle

lol iverjo
u/joeytwiddle

Do the two rows moving right look faster than the three rows moving left? #opticalillusion

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joeytwiddle

function u(t) {

c.width|=0;for(i=2;i--;)s=i?99+80*S(t*3):9,x.font=P=s+"px sans",
T=i?P:'X'.repeat(400),
x.fillText(T,960-x.measureText(T).width/2,540+s/3)

Jul 24 2019 8:53 AM UTC

}// 138/140

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To centralise #text vertically, add ~fontSize/3

u/joeytwiddle

To centralise horizontally, subtract x.measureText(T).width/2
u/joeytwiddle

(I think u/f8f82804 showed me that trick)

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joeytwiddle

remix of d/14827 by u/joeytwiddle

function u(t) {

c.width=600
d=(r,T)=>x.fillText(T,300+r*S(a=i/9.55),172-r*C(a))
for(i=N=t|0;i;i--)
for(N%i||d(90+i/4,i),k=75;k--;)N%i||d(k,'*')

Jul 15 2019 7:15 AM UTC

}// 127/140

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Divisors on a clock (second hand version) #math

u/katkip

awesome
u/aleamb

love it!
u/donbright

super cool
u/joeytwiddle

Shouts to u/donbright and u/taupelink

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joeytwiddle

function u(t) {

t||(Y=0)
onmousemove=e=>{Y=e.pageY*.7}
c.width=568;for(y=320;y--;x.fillRect(0,y,568,1))x.fillStyle=`hsl(${30*((y-Y)/30|0)},99%,50%`

Jul 14 2019 5:01 AM UTC

}// 131/140

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Broken parallax scrolling effect (only works if you wiggle your mouse over the dweet while you scroll the page)

u/joeytwiddle

I tried various things but I couldn't find any way for the iframe to know when it has been scrolled. :-/
u/katkip

It impossible. Iframe's cursor doesn't update if mouse isn't moving inside iframe

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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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joeytwiddle

function u(t) {

for(i=c=[3,4,50][q=t%3|x.beginPath()];i--;x.fillStyle='#'+'ee33e'.substr(q,3))x.arc(320+640*q,880-250*q,250-c,a=(1+q+4*i)/c*11/7,a);x.fill()

Jun 16 2019 5:48 AM UTC

}// 140/140

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#bauhaus

u/katkip

um ok
u/mbarkinozdemir

Awesome!
u/metamero

<3
u/DataMeta

yes
u/joeytwiddle

Took a while to golf this. Now I see the %3 is not needed!

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