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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veubeke

remix of d/6335 by u/Xen

function u(t) {

c.width^=0
x.globalCompositeOperation='xor'
for(i=24;i--;x.fill())x.beginPath(),x.arc(960+S(i)*C(t*10)*10,540+S(i)*S(t*10)*10,i*20,0,7)

Jan 22 2018 8:06 PM UTC

}// 135/140

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u/Xen

Love it :-)
u/Qwitter

I hear curley... the stooge

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yokljo

remix of d/8774 by u/Feiro

function u(t) {

with(x)for(k=2e3;k--;beginPath(fillStyle="#0001"))arc(960,540,k/4,v=k%4*1.57+S(t*3-k/280)+t,v+.2),strokeStyle=R((S(t)+2)*50),stroke()

Jun 28 2018 12:55 PM UTC

}// 133/140

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u/firegodjr

Excellent gradients!

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danny@hille.dk

function u(t) {

for(c.width|=i=114;i--;)for(j=66;j--;x.fillRect(i*18-P/2,j*18-P/2,P,P))P=S(((j-i)&(j+i))+t)*9+9

Apr 12 2023 7:58 PM UTC

}// 95/140

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u/tomxor

Weird... I like it :)
u/joeytwiddle

#sierpinski in the machine
u/acets1337

Galaga :D

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Tekmap

function u(t) {

for(X=Y=i=1e4;i--;x.fillRect(i,~x.clearRect(960+X*250,540+Y*250,3,3),!t||.1,2e3))j=i>>8,X=C(a=Y+j)+S(b=X+j*(t/99+9)),Y=S(2*a)+S(b)

Jul 6 2026 1:43 AM UTC

}// 130/140

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abrilmagenta

function u(t) {

p=3.14
r=t*p/180*S(t)*9
h=400*2
d=S(t)*h
x.strokeStyle=R(0,0,0,.1)
x.moveTo(h+d*C(r),h/2+d*S(r))
x.lineTo(h+d*C(r+p),h+d*S(r+p))
x.stroke()

Nov 8 2017 5:18 PM UTC

}// 139/140

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FrenchToast

function u(t) {

for(i=2;i<200;i++){
x.fillStyle = R(0,0,(i^2)%255);
x.fillRect(1920/2+S(i*t)*1920/2,1080/2+C(1.5*t)*1080/2,10,10)
}

Dec 29 2017 9:38 PM UTC

}// 115/140

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E-Mouse

remix of d/8270 by u/E-Mouse

function u(t) {

for(i=2e3;i--;x.fillStyle=R(C(t)*128+128,0,S(i)*128+128,.07))x.fillRect(960+S(p=i/314)*(d=250+T(p*3+t)*(T(t)*99)*T(t)*1),540+C(p)*d,9,9)

Oct 5 2018 9:03 PM UTC

}// 136/140

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u/donbright

i never imagined fillstyle could do so much

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veubeke

function u(t) {

r=Math.random
!t||(p|q)>>10|x.getImageData(p+d*2,q+e*2,1,1).data[3]?p=r(d=C(_=r(q=r()*1e3)*7|0),e=S(_))*1e3:x.fillRect(p+=d*2,q+=e*2,2,2)

Jun 8 2018 8:21 PM UTC

}// 137/140

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Tried to create a random city map. It doesn’t work as intended but is still nice to look at. ;)

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384.cz

function u(t) {

for(d=i=1e4;i--;x.fillRect(1e3+S(t-i/1e3)*99+T(t+i)*99,1e3-(d=T(S(i+t+d/9)))*(i/9),a,a))x.fillStyle=R(a=i/39,a*=S(t-i),a+C(a/(t%6))*i,a/i)

Feb 10 2024 12:30 PM UTC

}// 138/140

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colorful curtain

u/cantelope

looks nice
u/384.cz

Thank you!

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rodrigo.siqueira

function u(t) {

D=(a,b)=>{L=a.length,i=r=0,R='';while(i<53){d=i<L?~~(a[i]):0,R+=(i==L?".":"")+~~((K=d+(r*10))/b),r=K%b,i++}throw(a+"/"+b+"="+R)};D("1",9998)

May 30 2019 5:23 PM UTC

}// 140/140

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BigFloat in 140 chars! This is the Long Division Algorithm used here to calculate 1/9998. Note that this simple division results in Powers of Two: 0001, 0002, 0004, 0008, 0016, 0032, 0064.... Try to change 9998 for 9997 and you will see Powers of Three (1, 3, 9, 27, 81...). Guess what 9996 does? D is the division function. (a,b) are (numerator, denominator). 53 is precision (number of digits). Add more "9" to fit larger power numbers. E.g. To see powers up to 2**40 (that is 1099511627776), change denominator from 9998 to 9999999999998 and total number of digits from 53 to 534.

u/rodrigo.siqueira

I have discovered a truly remarkable demonstration of this result, but this comment is too small to contain.
u/joeytwiddle

#math #division
u/marc8

quoting Fermat... LOL