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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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nystrand

function u(t) {

for(c.width|=x[i=frame]=300,d=t?-d:1;i--;i%6||x.lineTo(T+1e3,S+540))S=T,T=x[i]+=d*x[e=i+(i+d)%3-i%3]/123*((e+d+(t&65|t/13.3))%3);x.stroke()

Jul 23 2017 1:10 AM UTC

}// 139/140

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RotatingSpherePatternPrinter

u/alien

wait what is going on here D: , could explain this x[i=frame] and T=x[i] plz
u/alien

How can you add T a numer, isn't T a defined function?
u/iverjo

frame is a number that starts at 0 and increases by 1 for each frame (this is actually a somewhat "hidden" feature in dwitter, and can be used as an alternative to t). T is initially a defined function (by dwitter), but the code in this dweet sets T to something else before a number is added to it. x[i=frame]=300 has the same result as i=frame,x[i]=300 because i=frame returns the new value of i
u/alien

D:!!!! @iverjo thxs
u/13thptr

#d3 #sphere

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Beginner

function u(t) {

c.width|=1;x.translate(960,540);for(i=15;i--;x.rotate(t*.3))x.rect(a=-90-i*20+90*S(t),t,-a,a*2);x.fill('evenodd')
/*Original by New_Core*/

May 19 2017 6:28 PM UTC

}// 138/140

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Remake of New_Core

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mxfh

remix of d/2719 by u/keithclark

function u(t) {

for(c.width|=a=50;--a;x.arc(960+S(G+t)*400,520+C(t+G*3)*400,a%25*70,0,6.2832))x.moveTo(G=a/25|0,0)
x.fill('evenodd')

May 15 2017 1:17 PM UTC

}// 116/140

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single fill draw call with fill-rule and arbitrary computation in moveTo

u/mxfh

#arc #fillrule

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keithclark

function u(t) {

for(c.width^=0,x.globalCompositeOperation='xor',a=50;--a;x.arc(960+S(G+t)*400,520+C(t+G*3)*400,a%25*70,0,7),x.beginPath(x.fill()))G=a/25|0

May 11 2017 12:16 AM UTC

}// 138/140

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u/donbright

for slower machines... for(c.width=320,x.globalCompositeOperation='xor',a=50;--a;x.arc(160+S(G+t)*99,100+C(t+G*3)*99,a%25*20,0,7),x.beginPath(x.fill()))G=a/25|0

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veubeke

function u(t) {

t?r=c.offsetWidth/1920:_=x.font='3in a',x.fillText('smudge',500,680),c.onmousemove=e=>x.drawImage(c,e.x/r,e.y/r,f=50,f,_.x/r,_.y/r,f,f,_=e)

May 10 2017 4:49 PM UTC

}// 139/140

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u/katkip

Not really
u/Jezza

#interactive

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keithclark

remix of d/2561 by u/keithclark

function u(t) {

for(a=c.width|=l=C(t),m=S(t);a--;x.fillRect((d*l-S(a)*m)*h+960,(g*l-f*m)*h+520,h/=65,h))d=S(a*(f=C(a*a))),g=d*m+S(a)*l,h=800/(3+g*m+f*l)

Apr 23 2017 6:19 PM UTC

}// 136/140

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3 bytes smaller

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prawnwarp

function u(t) {

c.width|=0;for(i=0;i<1920;i+=64){for(j=0;j<1080;j+=64){x.fillStyle=`hsla(${i*j},50%,50%,.3)`;s=S((t*j*.01+i))*64+64;x.fillRect(i,j,s,s);
}}

Apr 21 2017 1:53 PM UTC

}// 139/140

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u/magna

So pretty!
u/cantelope

you can omit the closing parenthesis for hsla and save 1 delicious byte :)
u/donbright

man this is nice

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joeytwiddle

remix of d/1763 by u/New_Core

function u(t) {

onkeyup=e=>{T||a.close();a=new AudioContext;o=a.createOscillator();o.connect(a.destination);o.frequency.value=7*1.06**e.keyCode;T=o.start()}

Apr 13 2017 12:32 PM UTC

}// 140/140

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A piano you can play with your keyboard. G is middle-c, i think

Show more comments…
u/joeytwiddle

Twinkle little star: GGNNPPN LLKKIIG NNLLKKIx2 GGNNPPN LLKKIIG
u/joeytwiddle

Silent Night: G IG D, G IG D, N NK, L LG, (I IL KIG IGD)x2, N NQ NKL P LGDGEB L
u/joeytwiddle

Star Wars: (IIIN U SRPZ U SRPZ U SRSP)x2 I IK KSRPN NPRP KM, I IK KSRPN UP. I IK KSRPN NPRP KM, IIN LJI GED BI. IKNSP
u/joeytwiddle

Thanks to @donbright who showed me where i could save 5 chars
u/iverjo

Very impressive :D
u/donbright

this is unbelievable. (ps thx but i stole the idea from others here)
u/donbright

(ok technically they gave it to me prob @cantelope / @manga)
u/Woodmouth

This is the strangest piano i've ever played, but good job!
u/Woodmouth

Also, i found a way to stop it, just press shift. (or any other key with a value too high or low to hear (At least i think that's what happens))
u/joeytwiddle

and of course thanks to New_Core for the intro to Web Audio API
u/joeytwiddle

#audio #music #piano #interactive
u/joeytwiddle

Star Trek intro: R M P H, F KP OKHMR RV Q T L, J OT SOLQV VZ
u/joeytwiddle

Star Trek main: B-L-KIGFE, C B-N-LKIGF, E-D FGIKLKN Q, P N D, I G (ILPS!)
u/joeytwiddle

One more you might know: NPSP WWU, NPSP UUS, NPSP S UR N NU S
u/joeytwiddle

Check the old comments for some simple tunes to play. You'll need to click on the blank canvas for keyboard focus. Hit Space, Shift or Escape for "silence".

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toxazol

function u(t) {

x.globalAlpha=.1
x.fillRect(0,0,i=w=2e3,w)
for(j=0.1;j<1;j+=0.009){
x.clearRect(w/2+.4*w*j*C(t*j*100)*C(t),w/4+.2*w*j*S(t*j*100),2/j,2/j)
}

Apr 3 2017 11:53 PM UTC

}// 140/140

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magna

remix of d/2375 by u/magna

function u(t) {

x.fillRect(x.globalAlpha=.1,0,w=2e3,w)
for(i=半=500;i--;x.clearRect(2*半+i*C(T=t-(Math.random()<2e-4)*.2),半+i*S(T),8,8));

Apr 1 2017 2:47 PM UTC

}// 119/140

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#radar