Dweets awesomed by u/f8f82804

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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cantelope

remix of d/2845 by u/cantelope

function u(t) {

A=960,B=540,x.fillRect(0,0,D=2e3,D)
for(i=D;i--;)x.clearRect(A+1/(Z=2.5+C(p=i*C(t/2)/40)*S(q=i/628))*(X=S(p)*S(q))*A,B+C(q)/Z*A,s=69/Z/Z,s)

Jul 10 2017 4:43 AM UTC

}// 140/140

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Show more comments…
u/lionleaf

That's really neat!
u/Polyducks

This is amazing! What's the concept behind it? How are you getting the sphere?
u/cantelope

@Polyducks, it's a golfed version of the equation of a sphere [x=sin(p1)*sin(p2);z=cos(p2);z=cos(p1)*sin(p2);] combined with a tiny 3D projector, X=cx+1/z*x*cx; Y=cy+y/z*cx, where cx/cy is center screen, and x/y/z are the 3D coordinates. Hope that makes sense! :)
u/cantelope

*equation of a sphere: [x=sin(p1)*sin(p2);y=cos(p2);z=cos(p1)*sin(p2);]
u/alien

thanks for that, is projector a mathematical construct? does it have other names?
u/cantelope

@alien it's my own invention, the product of years of research into geometry. I wrote a tutorial with a (very ungolfed) version here https://cantelope.org/3D
u/alien

*__*
u/alien

All the lienar algebra and vectorial calculus in my bachelor finnally comes to life in my head... this is soooo cool @cantelope...
u/donbright

bravo... bravo

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cantelope

function u(t) {

A=960,B=540,x.fillRect(0,0,2e3,2e3)
for(i=99;i--;)x.clearRect(A+1/(Z=2.5+C(p=i+t)*S(q=i/31))*(X=S(p)*S(q))*A,B+C(q)/Z*A,s=69/Z/Z,s)

Jul 10 2017 4:43 AM UTC

}// 132/140

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u/f8f82804

#sphere #perspective

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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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joeytwiddle

function u(t) {

r=Math.random;p=(X,Y,S,D,k)=>D&&(x.globalAlpha=.01,x.fillRect(X,Y,S,S),k=_=>p(X+2*S*r()-S,Y+S*r()/2,S*.8,D-1),k(),k());t||p(900,0,500,18)

May 15 2017 8:38 AM UTC

}// 137/140

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Random cloud generator

u/joeytwiddle

You can click on the code and hit Space to see more clouds
u/jick

I would love to see a breakdown of how this works.
u/joeytwiddle

It's a fractal using recursion. p draws a square with the given parameters. Then it calls p again twice to draw slightly smaller squares, offset from the parent.
u/joeytwiddle

Like this but more random (and with 2 children instead of ~7): http://neuralyte.org/~joey/hwimirror/hwi.ath…

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aemkei

remix of d/2554 by u/cantelope

function u(t) {

for(c.width|=i=99;i--;)for(j=40;j--;x.fillRect(i*J-C(t),J*9-C(i/4-t)*J,9,9))J=800/j

Apr 24 2017 8:31 PM UTC

}// 83/140

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Just a super reduced of @cantelope's awesome wave animation.

u/aemkei

"reduced version" ;)
u/cantelope

:O
u/aemkei

@p01 made it even shorter: https://www.dwitter.net/d/2571 (66 bytes!)

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hscells

function u(t) {

w=c.width=1920;s=32
for(i=0;i<w+s;i+=s)for(j=0;j<1080+s;j+=s)x.fillStyle=`hsla(${i+j},99%,50%,1`,x.fillRect(i-s+s*S(t+i),j-s+s*S(t+j),64,64)

Apr 23 2017 2:45 AM UTC

}// 140/140

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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

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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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joeytwiddle

function u(t) {

c.width=2e3;for(i=0;i<9;i++)for(j=0;j<40*(1+S(i+9*t)*C(i+t))*i;j+=90)x.fillStyle=R(j,500-j,0,1),x.fillRect(1400-i*99,900-j/2,69,30)

Apr 3 2017 4:56 PM UTC

}// 131/140

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u/nonce

I can hear the music in my head.
u/sfz

bass is thumpin
u/ilSilvano

I hear the Outrun soundtrack in my mind, and you?
u/joeytwiddle

Modern style spectrum: d/5576

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Jenky

function u(t) {

w=c.width|=0
for(i=0;++i<99;)z=50+~~(i**2/80),x.font=z+`px a`,x.fillText(['🌲','🌳'][i%2],(S(i)*w+t*z*4)%(w+z)-z,z*5)

Mar 31 2017 11:58 AM UTC

}// 115/140

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Trees to go along with https://www.dwitter.net/d/2352 :D

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u/Jenky

I challenge someone to combine the two, golfing that is gonna be a doozy
u/z3vin

i love this can you explain: z=50+~~(i**2/80), specifically ~~ and **
u/nonce

~~ is Math.floor() and ** is Math.pow(), I do not understand why you need to floor? Why do you need an integer z? Also i*i is 1 char shorter than i**2 so you could shorten it to: z=50+i*i/80 am I missing something?
u/nonce

FWIW you can have a non integer font size
u/nonce

Golfed a bit, removed the pines (they are evergreen) and added a season: https://www.dwitter.net/d/2361 (autumn)
u/Jenky

Totally missed that, and didn't realise fonts could have floating px. Nice remix, too :D
u/sfz

floating px makes the rendering much slower but it's doable with a reasonable amount of entities
u/nonce

@sfz what about floating em? What is the perf like for that?
u/aemkei

Nice one! Really love the style.
u/aemkei

You can save ~9 bytes:
u/aemkei

for(w=c.width|=i=0;++i<99;)z=50+(i**2/80),x.font=z+px a,x.fillText(i%2?'🌲':'🌳',(i**7+t*z*4)%(w+z)-z,z*5)
u/tapgiles

Very nice!
u/Polyducks

omg haha are these emoji!? That's so smart!!!
u/joeytwiddle

#landscape #parallax #trees
u/micahcowan

#emoji
u/katkip

#perspective

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nonce

function u(t) {

f=frame
g=_=>'\\uD83C\\uDD'+(230+_).toString(16)
m=f%25,n=~~(f/25)
x.font='40px o'
x.fillText(eval(`'${g(m)}${g(n)}'`),m*76,n*43)

Mar 31 2017 6:42 AM UTC

}// 129/140

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Flags of the world. Inspired by: https://esham.io/2015/04/emoji-flags-redux

u/Jenky

Doesn't work at all in Windows, which is a shame :( - Cool to see the range on mobile, though!
u/Polyducks

Works fine in Chrome on Windows for me!
u/f8f82804

#emoji
u/katkip

Where is A as a row

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