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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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

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KilledByAPixel

function u(t) {

c.style.background='black'

Jun 2 2020 5:13 PM UTC

}// 26/140

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#BlackoutTueday #BlackLivesMatter

u/katkip

c.style.background=R() is shorter

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lw0

function u(t) {

c.width=w=99*(t%.5+.3);c.height=h=w*.6+1;x.fillRect(0,0,w,w);x.strokeStyle=R(0,191,15);x.lineWidth=w/2;x.arc(t%w,h/2,w/5,0,7);x.stroke();

Jun 3 2020 8:18 PM UTC

}// 138/140

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test

u/stefano

I feel like I can hear it

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tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𛐱𞱴🱰𛡭𨑰𚀨𦱁𛁂𧐩🐾𬀽𬀮𫑡𬀨𚁛𨐬𨠬𨰽𨐬𩀽𨡝𚐽🠨𮀮𩡩𫁬𤡥𨱴𚁡𛁢𛀳𛀳𚐬𬠽𣑡𭁨𛡨𮑰𫱴𚁘👁𛑡𛁙👂𛑢𚑼𯀱𛁲𛰽𚁲𛐴𞀩𚠪𜰯𝱥𝀬𦱡𚰨𨐭𨰩𛰲𚱘𛱲𛁢𚰨𨠭𩀩𛰲𚱙𛱲𛁡𛁢𧐩𚐩𞡰👛𧐻𬁛𭀪𜠦𝠳𧐽𦰱𝐰𚱃𚁴𚐬𞀰𚱓𚁴𚑝`.replace(/u../g,'')))

May 31 2020 10:19 PM UTC

}// 138/140

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Say hello to fluffy !!

Show more comments…
u/tomxor

I was aiming for a #micelle using something like SPH, it arguably looks a bit like that after 30 seconds... or maybe an amoeba. It's not very SPH, basically just n-body with verlet integration and this simple pairwise constraint: k*(r-48)**3 where r is the distance between the particles and k is a stiffness parameter.
u/nburn42

How do you encode that? I tired for a little while to build something to do it, but failed.
u/nburn42

I'll try again later and I'll get it eventually, but it would be nice if there was some tool somewhere.
u/tomxor

d/11852 to get the source just replace eval with throw
u/nburn42

Thanks!
u/nburn42

https://www.dwitter.net/d/19014
u/Xen

very nice!, hypnotic