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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DaSpider

remix of d/26753 by u/KilledByAPixel

function u(t) {

b=`linear-gradient(${a=t*499}deg`
for(i=120;i--;)b+=`,hsl(${a+i} 99%${50+i/9}%)`
c.style.background=b

Jan 4 2023 11:41 AM UTC

}// 101/140

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mxfh

remix of d/2180 by u/aemkei

function u(t) {

for(i=W=c.width=2e3;i--;x.beginPath(),x.arc(W*(T(i/9)+s*t)%W,540+540*S(s*W),s*30,0,7),x.fill())s=149/(i*3+199)

Mar 18 2017 3:05 AM UTC

}// 110/140

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arc all the things

u/iverjo

#parallax #dots
u/mxfh

#arc

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taupelink

remix of d/23843 by u/taupelink

function u(t) {

for(i=k=256;i--;x.fillRect(k*X,k*Y,k*S(q*Y)/3**t,q*C(4*X)/t/2**t))f=i*t,X=f*f%8,Y=X*f%5,x.fillStyle=R(q=i*C(k/X),q*=C(t-Y),q/=t**.5,i/q/Y/Y)

Sep 28 2021 1:59 AM UTC

}// 140/140

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d/23947

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DaSpider

function u(t) {

if(!t){r=4,y=.55;x.fillStyle=R(8,8,8,.01)}
for(i=0;i<1e4;i++){
y=r*y*(1-y)
x.fillRect(y*1920,(r-3)*1080,2,1)}
r-=1e-3

Nov 3 2019 1:45 PM UTC

}// 117/140

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Chaos demo: Logistic map (¾)μ × y, ref. https://en.wikipedia.org/wiki/Logistic_map

u/DaSpider

The formula generates pseudo random numbers for r=4, but the distribution is not uniform.

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Xen

remix of d/8395 by u/robbyg

function u(t) {

for(c.width|=i=2e3;i--;)x.fillRect(i,S(i)*t*t,3,C(t-i)*1e3)

Jun 4 2018 11:43 PM UTC

}// 59/140

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bonus for 30seconds+

u/DataMeta

this is cool all the way to the 'end'
u/joeytwiddle

#wait_for_it

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anotherkitten

function u(t) {

d=(a,b)=>((a<<(b&7))%b)
m=Math.random
for(i=999;i--;)
a=m()*1920,b=m()*1080,
x.fillStyle=R(d(t,99*t)*(S(t)+1)/2),
x.fillRect(a,b,4,4)

Oct 29 2018 3:55 AM UTC

}// 133/140

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writhe

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mrfoogles

remix of d/22336 by u/mrfoogles

function u(t) {

w=c.width=1920
x.globalCompositeOperation='xor'
x.translate(w/2,w/3)
for(i=0;i<10000;i++)x.fillRect(S(t+i)*w/4,C(t-i)*w/4,100,100)

Apr 2 2021 9:43 PM UTC

}// 130/140

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Stretchy band

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zadgy5534

function u(t) {

for(i=64;i--;)for(j=32;j--;x.fillStyle=R(i/t/t,j/t/t,i*j/t/t))
x.fillRect(900-T(i)*99/t/t,500-S(j)*99/t/i,5,20)

Feb 7 2025 2:35 PM UTC

}// 111/140

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Fence

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taupelink

remix of d/29531 by u/taupelink

function u(t) {

f=u=>(((u%12-6)**2-18)**2-162)**2/5e3;g=n=>!(f(X/n)+f(Y/n)&n);for(i=1e4;i--;x.fillRect(480+20*X,60+20*Y,g(2),g(1)&g(4)))X=i*t%48,Y=X*i%48

Feb 25 2024 11:27 PM UTC

}// 137/140

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d/29570

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New_Core

remix of d/32708 by u/tomxor

function u(t) {

for(c.width|=i=7;i--;)x.quadraticCurveTo(X=960+400*S(a=i*1.047),Y=540+400*C(a),X+200*S(b=a+4.2+.314*S(t)+.314),Y+200*C(b))
x.fill()

Nov 7 2024 12:03 PM UTC

}// 131/140

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Just wanted to see if a curve could be used. (there is a linebug, thats why I chose fill)