Dweets awesomed by u/rep_movsd

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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FireFly

function u(t) {

for(c.width|=A=16,i=9e3;i--;(X&8?B&2:"<fnvff<Ā~``x```".charCodeAt((B/A&3)*8+Y%8)>>7-X%8&1)&&x.fillRect(A*X,A*Y,A,A))X=i&127,Y=i>>7,B=X+Y+t*8

Mar 6 2017 8:36 PM UTC

}// 140/140

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00FF. More embedded bitmap fun :)

u/iverjo

Cool!
u/sfz

Going to take a three month sabbatical and figure out how this works.
u/FireFly

Anything in particular that I should explain? It might help to draw the bits of the codepoints in the string literal on a piece of paper, as an 8×15 grid (15 chars, 8 bits per char). Ā is U+100, used to encode 0x00.
u/sfz

Neat trick!

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FireFly

function u(t) {

for(c.width|=i=0;i<40;i+=.025)R=S(t)/4+.25,r=.7-R,x.fillRect((A=R+r*S(D=i%1*44+88))*C(E=i+t/10)*480+960,(B=A*S(E)+r*C(D))*340+510,W=4-B*3,W)

Mar 6 2017 12:46 PM UTC

}// 140/140

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Torus-sphere thing

u/donbright

good one
u/SpecialAgent

excellent

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veubeke

remix of d/1893 by u/veubeke

function u(t) {

$=500;for(i=2e3;a=i--/$;x.fillRect(i,t*70+_*15,1,$))_=C(a+t)+C(a-t)*6+(r=i*i/t%1),
x.fillStyle=t<5?'#def':`hsl(${$+_},80%,${50-t*2-_-r*9}%)`

Mar 6 2017 8:25 AM UTC

}// 140/140

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Show more comments…
u/donbright

brilliant!!!!!!!!!!
u/SpecialAgent

nice!
u/iverjo

Amazing :D Now we just need a sun in the top left corner ;)
u/iverjo

http://iver.io/stuff/dweet-landscape-combo.g… (warning: 3 MB)
u/magna

Still missin: 🐄
u/sigveseb

Lol iverjo nice shoop
u/PiggyClone205

Bring us cows, veubeke.
u/joeytwiddle

#landscape #scene
u/micahcowan

#pretty

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aemkei

function u(t) {

c.width^=0;for(i=0;i<499;i++)x.fillRect(900+(S(i/9))*(Z=1e3*(i+t/8)%300*2),500+(S(i*42)*Z),S(i)*20,S(i)*20);

Mar 4 2017 9:30 PM UTC

}// 109/140

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Supernova

u/iverjo

Spot on :) Supernova was actually the first word that came to mind when I saw the dweet. Then I saw your comment ^^

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FireFly

function u(t) {

for(c.width|=M=Math,i=2e4;i--;x.fillRect(A*8,B*8,W=9+M.atan2(M.sqrt(1-X*X-Y*Y),X)*3-t*4&7^4-M.asin(Y)*3,W))X=(A=i%135)/67-1,Y=(B=i/135)/67-1

Mar 4 2017 6:26 PM UTC

}// 140/140

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Raycasted rotating sphere with UV-mapping!

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u/sfz

... ??? !!!
u/iverjo

Impressive! I like the c.width|=M=Math hack. Apparently Math is evaluated to NaN in the process.
u/iverjo

http://stackoverflow.com/a/11037887/2319697
u/alien

god... i can't understand this yet but is awesome...
u/sigveseb

So good!
u/donbright

standing ovation
u/tomkh

great job! some tricks here really opens new possibilities
u/mxfh

you can do M.sqrt() with ES6 power operator as **.5 should yield a net gain of 2 chars
u/FireFly

Oh right! I haven't gotten used to it yet since I'm on Fx51, which doesn't seem to support ** yet. Thanks!
u/FireFly

Oh, and also thanks for all the positive responses, everyone :)
u/iverjo

#sphere
u/lionleaf

#disco
u/f8f82804

#halftone #dithering #shading

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sebbert

function u(t) {

c.width=999;for(a=b=z=0,w=140;z<400;z+=.1)a=S(a*2.4-t)*S(t*2)+C(a+b+t)+C(z*2.34+t),b=C(z*1.56),x.fillRect(a*w+500,b*w+w+w,2,2)

Mar 4 2017 12:59 AM UTC

}// 126/140

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u/donbright

woah!
u/SpecialAgent

Energize!
u/FireFly

This one is really cool o.o
u/FireFly

I would love an explanation or pointer about the maths going on here… in particular I don't understand why the 1.56 constant for the b= is so sensitive. It looks like an approximation of π/2, but all of π/2, 1.57 and 1.5 behave vastly differently/more chaotically. So what's the relationship between these numbers/how is 1.56 derived?
u/tapgiles

What the... @.@ Looks so detailed!
u/joeytwiddle

Some other constants with similar behaviour: 1.17, 2.34, 3.12, 3.51, 3.90, 4.68, 6.24
u/joeytwiddle

And a few with different behaviour: 3.08, 6.05 (!), 6.35

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hamptonio

remix of d/1830 by u/hamptonio

function u(t) {

w=c.width=1920;for(i=w;i--;){q=0;a=1;b=1;e=1+9*t%9;for(j=99;j--;){q+=a*C(b*(i-w/2)/100);a/=2;b*=e};x.lineTo(i,200*(2.5-q));x.stroke()}

Mar 3 2017 3:48 PM UTC

}// 135/140

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Animation of Weierstrass's 1872 example of a continuous function that becomes nowhere-differentiable when b>=7.

u/donbright

very interesting!!!! always felt like demoscene is a gateway to math

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donbright

remix of d/1755 by u/SpecialAgent

function u(t) {

n=frame
q=n%2?400:289.2
d=n%2?2*t:2*t/.61518
X=960+q*C(d),Y=540+q*S(d)
n%4?x.moveTo(X,Y):x.lineTo(X,Y)
x.stroke()
x.fillRect(X,Y,9,9)

Mar 3 2017 2:36 AM UTC

}// 133/140

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This shows the pattern traced by a line directly between the Earth and Venus as they orbit the sun. This pattern is pretty ancient, for example discussed in the book Quadrivum about the old academic relationships between art and science. This type of pattern may be helpful to appreciate the concept of Orbital Resonance in a planetary system.

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u/donbright

thx to https://nssdc.gsfc.nasa.gov/planetary/factsh… for the data
u/sfz

Fascinating
u/donbright

inspired by @SpecialAgent obvs!
u/SpecialAgent

This pattern is very pleasing to the eye, very nicely done!
u/sigveseb

This space stuff is nice!
u/Lazy1337

#cardioid
u/Lazy1337

#math
u/donbright

#venus #space #orbits

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iverjo

function u(t) {

c.width=384;for(i=20;i--;)for(j=9;j--;)if(!i||(i^j)%2){x.fillStyle=R(a=i?0:240),x.fillRect(i*20+j%2*4*S(t)-25+9*S(j),j*20,i?20:420,i?20:2)}

Mar 2 2017 6:29 PM UTC

}// 139/140

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Optical illusion thingy. It's supposed to look like the red lines are not really straight and parallel. #bartjs

u/sfz

it works, trippy!
u/iverjo

Fun fact: This was actually the first idea I ever had for a dweet, back in december 2015 when sigve made https://github.com/sigvef/arktis-tweet-demo/
u/donbright

great illusion
u/SpecialAgent

Expecting a gorilla and some barrels to come hurtling down. Love it.
u/iverjo

#opticalillusion

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FireFly

function u(t) {

t || x.translate(X=960, 540)
x.fillStyle = 'hsl('+t*80+',80%,50%)'
x.drawImage(c,9,9)
x.fillRect(t*70%X, 1, 32, 24)
x.rotate(4)

Mar 2 2017 1:53 PM UTC

}// 127/140

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Fast-paced kaleidoscope

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