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.

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Current theme challenge: #Food

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Finianb1

function u(t) {

for(i=0;i<9;i++){
x.fillStyle=`hsl(${t*100},100%,50%)`
x.fillRect(S(t)*390+850,C(t)*390+500,150,150)}

Oct 6 2018 1:54 AM UTC

}// 101/140

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Rainbows

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Finianb1

function u(t) {

c.width^=0;x.translate(960,540);for(i=-10;i++<10;)
x.lineTo(0,i*45),
x.rotate(C(t+i*6)),
x.lineWidth=10,
x.stroke()

Oct 6 2018 1:45 AM UTC

}// 115/140

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Remixed version of https://www.dwitter.net/d/10247

u/BalintCsala

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katkip

remix of d/6929 by u/davidsharp

function u(t) {

c.width|=0;x.font='2cm A';for(n=0;n<19;)x.fillText('♥️',n++*100+S(t+n)*30,1080-(Math.abs(t*100*S(n))%1080))
x.drawImage(c,40,0)

Oct 5 2018 11:36 AM UTC

}// 127/140

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Solved an error.

u/donbright

38 luftbaloons...

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zanella

remix of d/10234 by u/Purpzie

function u(t) {

c.width|=0
r=[0,1];for(i=2;i<1e3;i++)r.push(r[i-1]+r[i-2])
x.font='99px"'
x.fillText(r.join(' '),-200*t,500)

Oct 4 2018 5:41 PM UTC

}// 108/140

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Bring back the marquee tag!! #90s

u/donbright

i really like this one for some reason i cant quite put my finger on

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cantelope

remix of d/10234 by u/Purpzie

function u(t) {

for(c.width=-1,з=0,_=[ф=1,п=ф];з++-20;)_.push(п+=_[з-ф]);x.fillText(_,0,9)

Oct 4 2018 4:42 PM UTC

}// 74/140

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u/magna

#fibonacci
u/magna

18 characters longer, avoids loop: x.fillText([c.width=-1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,67],-3,9) :D
u/donbright

#oeisA000045

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katkip

remix of d/10248 by u/katkip

function u(t) {

c.width^=0;x.translate(960,540);for(i=0;i++<90;)x.lineTo(0,i*15),
x.rotate(t/20+i/200),x.fill(),x.globalCompositeOperation='xor'

Oct 5 2018 10:04 AM UTC

}// 128/140

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#challenge #abstract if you look in the until it resets the rotate then you look away at an object, you will move that object with the mind!

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atsn

function u(t) {

window.location=`/id/${Math.floor(Math.random()*10212)}`

Oct 4 2018 7:43 AM UTC

}// 56/140

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On the off chance this hasn't been done before.

u/katkip

GENIUS #external
u/katkip

Not really external but you get the point. It has been already done but a different way.

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yonatan

function u(t) {

c.width=99
for(i=0;i++<6e3;x.fillRect(X,Y,1,1))Y=i/99|0,X=i%99,U=X-50,V=Y-30,h=S((U*U^V*V^t*t)**.2-t*9),x.fillStyle=R(n=99+h*99,n*2,n*3)

Oct 2 2018 9:30 PM UTC

}// 136/140

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u/donbright

omg
u/donbright

i feel like you could write an entire book explaining your dweets, one dweet per chapter, it would be like 300 pages
u/Qwitter

yikes how did you find this! Awesome

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donbright

remix of d/10243 by u/cantelope

function u(t) {

for(c.width^=з=0,M=[ф=1,п=ф];з++-12;){
M.push(п+=M[з-ф])
for(A=6.3;A>0;A-=(t+.1)/M[з])
x.fillRect(1e3+39*з*C(A),500+39*з*S(A),7,7)
}

Oct 5 2018 4:43 AM UTC

}// 132/140

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fibboclock?

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atgz

remix of d/10193 by u/ellisk1

function u(t) {

eval(unescape(escape`挮睩摴桼㵱㴮㈹㤲㭸⹴牡湳污瑥⠹㘰ⰵ㐰⤻景爨椽〻椼㌲㤻椫⬩砮牯瑡瑥⡱⬨椥㈲㼰㩱⼲⤫⡩㰱⤪琩ⱸ⹦楬汓瑹汥㵒⡓⡴⨮㜩⨲㔵ⱓ⡴⨳⸱⵩⤪㈵㔬㍥㐯椩ⱸ⹦楬汒散琨愽⡩⼲㈫琯㈫㈪琩┱㔪㔰ⱡⱷ㵡⨪⸷㔬眩`.replace(/u(..)/g,"$1%")))

Oct 2 2018 1:30 PM UTC

}// 140/140

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u/MAxSaL

What's up with all the Chinese symbols?
u/prplz

Paste the source, without the eval(), into your dev tools console to unpack it
u/zanella

MAxSal - if you want to create compressed dweets (up to 184 characters), use this: https://www.dwitter.net/d/9207