Dweets awesomed by u/CliffJonesJr

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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mxfh

function u(t) {

c.width=w=1920;π=Math.PI/2;λ=0;r=w/4;for(φ=-π;φ<π;φ+=1/r){λ+=.1;x.lineTo(C(φ)*S(λ-t)*r+w/2,(C(t)*S(φ)-S(t)*C(φ)*C(λ-t))*r+r)}x.stroke()

Feb 20 2017 11:57 AM UTC

}// 135/140

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simple orthographic projection; try some factors on the lat λ and lon φ offsets t

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u/mxfh

simple orthographic projection; try some factors on the lat λ and lon φ offsets t
u/wicktwo

Niiiice!
u/as

i love this one
u/ssg

nice variable names!
u/donbright

so elegant
u/lionleaf

#sphere
u/lionleaf

#d3 . (3d is currently not a valid hashtag)
u/BirdsTweetCodersDweet

#whichwayround #inorout

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mxfh

function u(t) {

d=x.getImageData(0,0,w=c.width=256,h=144);for(i=0;i<h;i++)for(j=0;j<w;j++)d.data[(i*w+j)*4+3]=(i-j&j+i)*t%w;x.putImageData(d,0,0)

Feb 20 2017 3:43 AM UTC

}// 129/140

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u/jim

This is my favorite demo on Dwitter so far
u/mxfh

first draft on documenting the more obvious parts: https://news.ycombinator.com/item?id=13712558
u/hamptonio

pretty sick
u/mxfh

drone audiosoundtrack paste this:
u/mxfh

;new Audio("data:audio/wav;base64,"+window.btoa('RIFF$WAVEfmt data'+x.getImageData(0,128,c.width,32).data.reduce((data,byte)=>data+String.fromCharCode(byte),''))).play()
u/mxfh

//safer encoding: ;new Audio("data:audio/wav;base64,UklGRiQAAgBXQVZFZm10IBAAAAABAAIAAIAAAAAAAgAEABAAZGF0YQAA"+window.btoa(x.getImageData(0,128,c.width,32).data.reduce((data,byte)=>data+String.fromCharCode(byte),''))).play()
u/Xaviaro

Breathtaking!
u/lionleaf

#fractal #recursive
u/Galaxtone

Of you let it run long enough it returns to the original image but sort of pixelated and a little more and it'll return to the original image

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iverjo

function u(t) {

for(i=0;i<2400;i++)x.beginPath(),x.arc(960+i*C(i/20),540+i*S(i/20)/3,29+i*i/2e4,0,7),x.fillStyle='#'+['000','A0E','FFF','9F0'][i%4],x.fill()

Jan 28 2017 10:00 PM UTC

}// 140/140

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Optical illusion: Go fullscreen and glance at the different parts of the image. As you move your eyes, it may seem like other parts of the image moves slightly.

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u/iverjo

This needs a large and bright display to work
u/donbright

lol i kept looking for 't' in your code, not there!
u/iverjo

Haha!
u/CliffJonesJr

I love these illusion dweets. Nice!
u/iverjo

Thanks :)
u/iverjo

#opticalillusion

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iverjo

function u(t) {

c.width=960;for(i=26;i--;)d=(i+3*t)%26,I=C(d*.7)>0?1:0,x.beginPath(),x.arc(480,270,I?(d*22):(600-d*22),0,6.4),x.lineWidth=12,x.stroke()

Jan 28 2017 9:13 PM UTC

}// 135/140

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Optical illusion: Go fullscreen and stare at the center for 15-30 seconds. Then look down at your keyboard. Notice anything unusual?

u/iverjo

129 characters: c.width=960;for(i=26;i--;)d=(i+3*t)%26,I=C(d*.7)>0?1:0,x.beginPath(),x.arc(480,270,I?d*22:600-d*22,0,7),x.lineWidth=12,x.stroke()
u/iverjo

#opticalillusion

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iverjo

remix of d/50 by u/iverjo

function u(t) {

k=260;c.width=2e3;for(i=9;i++<5*k;)p=t+i/k+i%8*5,s=3/(10-p%9),x.beginPath(),x.arc(79*T(p*S(t/9)+1)+i%8*k,550*s,49*s*S(i/k),i,i+7),x.stroke()

Jan 14 2017 4:28 PM UTC

}// 140/140

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u/hamptonio

Its like a C.elegans dance party.
u/CliffJonesJr

Leeches!!!

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iverjo

remix of d/598 by u/iverjo

function u(t) {

c.width=1920;for(i=-2;i<2;i+=.05)for(j=-4;j<4;j+=.05)X=j-3*S(t),Y=i+C(t),1/(j*j+Y*Y)+1/(X*X+i*i)>1&&x.fillRect(j*240+960,i*240+540,12,12)

Jan 14 2017 3:56 PM UTC

}// 137/140

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u/nickd3000

A weird remix https://www.dwitter.net/d/6361
u/iverjo

#metaballs

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