Dweets awesomed by u/garettridge

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: #Opposites

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sfz

remix of d/1262 by u/khalkeus

function u(t) {

b=480
m=99
for(i=1;i<m;i++)for(j=1;j<m;j++)q=t+j,v=S(-q),x.fillStyle=R(2*j*C(t),2*i*v,4*j*v),x.fillRect(2*b+S(i/j)*C(q)*b,b+S(i*j)*v*b,9,3)

Feb 24 2017 11:25 PM UTC

}// 139/140

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u/donbright

reminds me of cells dividing

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fufuhaaa

function u(t) {

c.width=2e3;r='';for(i=0,l=1;i<1e9;){m=i;i+=l;l=m;r+=i}for(i=0;i<200;)x.fillRect((r[++i]*192+(t*1e4)/(1+r[++i]))%2e3,(r[++i]*100),9,9);

Feb 22 2017 1:30 AM UTC

}// 135/140

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The Fibonacci numbers concatenated may not be the best way of generating random numbers, but it's the only short one that came to mind.

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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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Show more comments…
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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