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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New_Core

function u(t) {

for(c.width|=i=60;i--;)a=i*i/3**S(t*.7),x.fillStyle=`hsl(${(i+t*9)*9},68%,56%`,x.fillRect(960+500**S(i/30+t*1.3)-a/2,a,a,a)

Nov 13 2019 9:49 AM UTC

}// 123/140

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u/Xen

nice

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BriSeven

remix of d/579 by u/BriSeven

function u(t) {

m=127;x.fillStyle=R(C(h=t/2)*m+m,S(h-.5)*m+m,S(-h-.5)*m+m);x.fillRect(t*m,0,4,2e3);x.drawImage(c,2*C(t),0,1920,1060)

Nov 14 2019 2:31 AM UTC

}// 116/140

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Incorporating changes from the comments.

u/Xen

nice

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Xen

remix of d/16621 by u/41407

function u(t) {

for(t+=w=c.width|=i=2e3;i--;)x.lineTo(w/2+C(z=t*i/S(t/w*t|0)/w*2)*i,w/4+S(z)*i)
x.stroke()

Nov 13 2019 4:30 PM UTC

}// 90/140

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u/joeytwiddle

Fullscreen for insta-hypnosis
u/username

fullscreen yikes

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rnbw

function u(t) {

for(j=0;j++<4;)for(i=-2;i++<9;){x.fillStyle=`hsl(${(h=i*(s=270)+t*240%s)/7+t*29},90%,75%)`;x.fillRect(h*(j%2*2-1)+((j+1)%2)*2e3,j*s-s,4,s)}

Nov 13 2019 3:45 PM UTC

}// 139/140

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rainbow gradient scrolling squares - this wasn't what i intended but it's good anyway!!

u/Xen

nice!

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metamero

function u(t) {

for(i=49;i--;x.fillRect(435+i%7*T,15+j*T,T=150,T,x.fillStyle='#'+'FFF,FCDD09,EB7711,DA121A,742C64,0F47AF,078930'.split`,`[(i-j)%7]))j=i/7|0

Nov 11 2019 3:03 PM UTC

}// 139/140

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Whipala

u/metamero

toda solidariedade ao povo boliviano! américa latina resiste!
u/joeytwiddle

#flag representing some native peoples of the Andes, including Bolivia, Peru, Ecuador, ...

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KilledByAPixel

remix of d/16612 by u/michaelplzno

function u(t) {

with(x)for(i=450;i--;fill(arc(i*9+((Y%2*2-1)*t%3)*288-880,45+Y*90,50,0,7)))beginPath(Y=i%12),fillStyle=`hsl(${i%8*15+180} 70%${70-Y*4}%`

Nov 13 2019 12:56 AM UTC

}// 136/140

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Damien Remix

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veubeke

function u(t) {

c.width^=0
for(i=9;i--;)x.fill(new Path2D(`M${(4+i+S(t)*3)*100} 400h50v200h-50z`))

Nov 14 2019 1:51 PM UTC

}// 82/140

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u/katkip

#path

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RealPeha

remix of d/16597 by u/metamero

function u(t) {

for(i=4e3;i--;x.fillRect(frame*T,j*T,T=15,T,x.fillStyle='#'+'FFF,FCDD09,EB7711,DA121A,742C64,0F47AF,078930'.split`,`[(i-j)%frame]))j=i/40|0

Nov 12 2019 3:53 PM UTC

}// 139/140

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🤷‍♂️

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bmearns

function u(t) {

v=o=>120*(1+S(Date.now()/60000+o));
x.fillStyle=R(v(0),v(2),v(4))
x.fillRect(0,0,1920,1080)

Nov 14 2019 3:05 AM UTC

}// 91/140

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Patience is a virtue.

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Xen

remix of d/16609 by u/michaelplzno

function u(t) {

for(i=1e3;i--;x.fillRect(-480+(i/11)*90+(w%2*2-1)*t%2*360,w*99+C(i/t)*49,i,129))w=i%11,x.fillStyle=`hsla(${i+t*491},99%,40%,.1)`

Nov 12 2019 7:09 PM UTC

}// 128/140

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#Aura

u/katkip

#xweet