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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katkip

remix of d/15133 by u/KilledByAPixel

function u(t) {

for(i=1024;i--;)"ﾇ縇縇繷繷繷繧繇缇﻾砇ﹾ烧ﹼ懧︼揧䟧쿧쿧쿧쿧쿧쿧쟧ﰇ＇쿿��".charCodeAt(i/16)&1<<i%16&&x.fillRect(i%C*C,i&-31,C=32,C)

Jun 3 2020 5:45 PM UTC

}// 139/140

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u/13thptr

#blacklivesmatter

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rodrigo.siqueira

function u(t) {

!t&&(c.outerHTML=`<b contenteditable onInput=localStorage.T=this.innerHTML>${localStorage.T||"Text editor. Type here, content is saved."}`)

Jun 3 2020 4:26 PM UTC

}// 139/140

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Text editor with auto-save. Type and reload (or come back later). Your edits are stored in this Dweet.

u/rodrigo.siqueira

Shortcuts: control-b (bold), control-i (italic), control-u (underline). You can even paste html in this Dweet.
u/katkip

wow
u/rafroller

So cool ! Nice use of localStorage :)
u/sigveseb

Cool, didn't know that you could do bold, italics etc like that in contenteditable

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nburn42

function u(t) {

if(!t)x.fillRect(0,0,2e3,2e3)
for(j=0,m=x.getImageData(0,0,2e3,1e3),g=m.data;j<300;j+=4)g[~~(8e6*S(t))+j]=255*C(t*9)
x.putImageData(m,0,0)

Jun 5 2020 1:20 AM UTC

}// 138/140

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Trying to play with the raw image data is hard

Show more comments…
u/cshadows

wow!!
u/tomxor

It is hard - shame there isn't a simple buffer to write to
u/nburn42

I wanted to build cellular automata based off raw data, but there is so much overhead involved.
u/nburn42

I'll try anyway.
u/tomxor

What do you mean by raw data? using the frame buffer for state? there are quite a variety of CA implementations here but they are mostly tagged gameoflife regardless of specific rule. I made a larger than life one recently that is capable of >1 radi moore neighborhoods
u/nburn42

I see some of your CA, the are awesome, I'll play around with some of your methods too.

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ben221199

function u(t) {

c.style.background=R()

Jun 4 2020 9:41 PM UTC

}// 22/140

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Solution of u/katkip

u/ben221199

#blacklivesmatter

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ben221199

function u(t) {

x.fillRect(0,0,1920,1080)

Jun 4 2020 9:15 PM UTC

}// 25/140

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#blacklivesmatter

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nikoloffgeorgi

function u(t) {

c.width|=!t&&(a=b=600,z=0,v=k=999);m=t-z;z=t
a+=v*m
b+=k*m
v+=S(t)*100
;(a>1900||a<10)&&(v=-v)
;(b>1060||b<10)&&(k=-k)
x.fillRect(a,b,20,20)

Jun 6 2020 9:07 AM UTC

}// 140/140

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rodrigo.siqueira

remix of d/18653 by u/rodrigo.siqueira

function u(t) {

for(i=1e3;i--;x.fillStyle=R(Y+Z,Y/3,X,.1))x.fillRect(X=C(z=S(i**9)*7-5)*i**1.5,Y=600+S(z/2)*i*S(t/5)*3,Z=400*S(i),Z),x.strokeRect(X,Y,Z,Z)

Jun 1 2020 8:34 PM UTC

}// 138/140

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Moving squares - Abstract Neoplasticism #art

u/Xen

love it!
u/taupelink

This is excellent
u/tomxor

Strangely familiar O_o
u/DataMeta

Fun!! #abstract

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nburn42

remix of d/19043 by u/nburn42

function u(t) {

if(!t) x.fillRect(0,0,2e3,2e3)
for(j=1,m=x.getImageData(0,0,2e3,1e3),g=m.data;j<8e6;j+=48+g[j])g[j]=255-g[j]
x.putImageData(m,0,0)

Jun 5 2020 3:31 AM UTC

}// 130/140

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u/pavel

If you declare your vars you can't get this to run reasonably well t||x.fillRect(0,0,w=2e3,w);let j=1,m=x.getImageData(0,0,w,w),g=m.data;for(;j<8e6;j+=48+g[j])g[j]=255-g[j];x.putImageData(m,0,0)
u/pavel

you can** get this to run
u/nburn42

Sweet, thanks
u/nburn42

Your code doesn't grab the data every frame, it didn't even cross my mind to only do it once.
u/joeytwiddle

Or just run it in Firefox ;-)

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nburn42

remix of d/19043 by u/nburn42

function u(t) {

x.fillRect(0,0,2e3,2e3)
for(j=t%8e6,m=x.getImageData(0,0,2e3,1e3),g=m.data;j<8e6;j+=5+t)g[~~j]=255-g[~~j]
x.putImageData(m,0,0)

Jun 5 2020 3:02 AM UTC

}// 127/140

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Turns on the fans on my laptop

u/joeytwiddle

#heavy

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pavel

function u(t) {

for(i=c.width|=0,q=(t%1)**5;i--;x.fill(x.arc(960+p(1),540+p(6),(i%2||q)*90,0,7)))x.beginPath(p=m=>((i>>m)%32-16)*90*(t+m&1?(1+q)*(1+i%2):2))

Jun 1 2020 4:22 AM UTC

}// 140/140

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https://twitter.com/concinnus/status/1265689…

u/KilledByAPixel

it actually has one of your dweets in it :)
u/katkip

smooth