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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Irratix

function u(t) {

c.width=1920;for(i=0;i<1920;i+=20)for(j=0;j<1080;j+=20,x.globalAlpha=S(i*j*t/5e3)**2,x.fillRect(i,j,20,20));

Oct 3 2019 9:29 PM UTC

}// 108/140

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Basics: fill every spot on the image but with a certain brightness. Define your own function based on the x,y coordinates (i,j) and t to turn it into an animation.

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asteriskman

function u(t) {

c.width|=0
x.font='6em"'
q=t/9%2
x[f='fillText']('👻',q*999-350,99)
x[f](13*Math.pow(-.5+q,2)<1?'O:':':)',4500*Math.pow(q-.5,3)-99*q+550,99)

Oct 4 2019 11:28 AM UTC

}// 139/140

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Inktober Day 4 - Freeze

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joe.m

function u(t) {

w=540;p=.0175;n=[6,2],d=[71,29]
if(!t)k=i=0
if(k>600)c.width|=k=0,i++
z=p*d[i%2]*k++
r=S(n[i%2]*z)*w
x.lineTo(w+r*S(z),w+r*C(z))
x.stroke()

Oct 3 2019 8:26 PM UTC

}// 139/140

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not quite a maurer #rose

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Irratix

function u(t) {

t*=60
for(i=[];i.length<t;i.push(t/i.length)){x.fillStyle=R(t/60%260,t%253,t%246,.1);x.fillRect(0,i[i.length-1],1e5,2)}x.drawImage(c,2,1)

Oct 3 2019 7:11 PM UTC

}// 137/140

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Scanlines

u/DataMeta

nice concept

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sirjofri

function u(t) {

c.width=1920
a=['000','f00','ff0']
for(j=0;j<3;x.fillStyle='#'+a[++j])
for(i=0;i<192;i++)x.fillRect(i*10,S(i/4*(S(t)/2))*10+j*300+90,10,300)

Oct 3 2019 1:11 PM UTC

}// 140/140

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German Unity Day

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afs

function u(t) {

x.rotate(.00001);d=t<40&&-t*200*t;x.strokeRect(860+(S(t)*(-100+C(t)))*-3,700+(C(t/6)*(50+C(t)*30+S(t)*30))*.2,d*200,d*200);x.rotate(t/40000)

Oct 3 2019 10:07 AM UTC

}// 140/140

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afs

function u(t) {

d=t<1.8&&-t*200*t;x.strokeRect(400+(S(t)*(-600+C(t)))*-3,200+(C(t/6)*(50+C(t)*1000+S(t)*30))*.2,d*20,d*20);x.rotate(t*t*t/50)

Oct 3 2019 9:49 AM UTC

}// 125/140

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sirjofri

function u(t) {

c.width=1920
for(j=0;j<10;j++)for(i=0;i<19;i++)
x.fillStyle=`#${((j+i/2)%4)*2}00`,x.fillRect(i*100+T(t+j),j*100+T(t/10+i),100,100)

Oct 1 2019 6:54 PM UTC

}// 130/140

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metamero

function u(t) {

localStorage.Ç="𫢁򑒤𰀅𐱣𐳅𜸄𱂀𑀃𰰣𹑮𰘃𩂀𐰃𨰃𩒀𐱤𨁠𨲡򨸄𒰋𐲃𐵄񨅠𨁠𩂁򂡄𹀇𢒫񣅀𨁠𐱄𹀧𢒫𴢀𸦇𒐉𐲃𒐃𒐉𐲃𸂂񉔀񐧈𰣥񠐱𸩧񑁑񉐮𡂤𙱉𺵌񠁠𨀣𡂤𑱉𺱯𛙦򙁄񚧧𢃨񛄠𨁠𙀉𐰉𒐃𰲁𰣥񐕢򁀣򒀈𒀃𨰃𹄀񐁠𨁣𰙥򑀇𑰃𰰃𩃠񈁠𨁤𰐃"
location='/id/15868'

Oct 1 2019 4:38 PM UTC

}// 121/140

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"código" poem logo by Augusto de Campos (1973) transcreation by Marcos Assis (2019)

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joe.m

remix of d/15861 by u/joe.m

function u(t) {

if(!t){for(i=n=2601;i--;u[i]=1)q=1;j=q*q}
if(u[q-1]&j<n){u[j-1]=0;x.fillRect(37*((j-1)%51),21*((j-1)/51|0),35,19);j+=q}else{q++;j=q*q}

Oct 1 2019 8:51 AM UTC

}// 134/140

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pavel, this one is for you #prime #sieve

u/pavel

nice 👍
u/username

#waitforit