Dweets awesomed by u/recursive

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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magna

remix of d/1289 by u/magna

function u(t) {

e=1e4;(i=new Image).src=c.toDataURL('image/jpeg',q=.8).replace(eval(`/(.{${t%e+e}})./`),'$1a');x.globalAlpha=q;x.drawImage(i,0,3,1920,1070);

Feb 25 2017 2:58 PM UTC

}// 140/140

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Island at Night (wait until it stabilizes - works only on Chrome)

u/sigveseb

this is an excellent idea!

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MrOpposite

function u(t) {

s='';for(a of'挮睩摴栽ㄹ㈰㭦潲⡩㴰㭩㰹㭩⬫⥸⹦楬汒散琨㐰〫椪㄰〫匨琩⨳〰ⰴ〰ⰵ〬㈰〩')s+=String.fromCharCode((p=a.charCodeAt())>>8,p&255);eval(s)

Feb 25 2017 1:51 PM UTC

}// 110/140

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This is an attempt at a byte packing algorithm, which packages two bytes into a single JS character.

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u/MrOpposite

It works, but it's footprint is too large to work in 140 characters. The algorithm itself is 75 characters, we need sub 70 characters to make a character profit.
u/MrOpposite

Feel free to remix if you figure something out that can reduce it even further
u/xem

Hello sir ! As a matter of fact, we can :) during the past years @subzey, @fakeunicode and I (@MaximeEuziere) have built a solution allowing to store 194 ascii js chars in 140 characters, including the unpacking and the eval. The decoder is 43b long. All the details are here: http://xem.github.io/obfuscatweet/. Cheers
u/MrOpposite

@xem Actually, those are encoded as "multicharacter"-characters. I only work with UTF-16, and thus fit 2 bytes into a single character without making <string>.length "see" my extra characters.
u/MrOpposite

<string>.length *
u/xem

Ah okay. Here's a version 1b shorter: eval('挮睩摴栽ㄹ㈰㭦潲⡩㴰㭩㰹㭩⬫⥸⹦楬汒散琨㐰〫椪㄰〫匨琩⨳〰ⰴ〰ⰵ〬㈰〩'.replace(/./g,a=>String.fromCharCode((p=a.charCodeAt())>>8,p&255)))
u/MrOpposite

Ooh, clever!
u/sigveseb

#compressed #default

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5Mixer

remix of d/1293 by u/5Mixer

function u(t) {

w=c.width=2e3
o=0
while(o++<9){l=r=o
x.fillStyle="#"+o*22
q=t*o*20
while(l<w+q){r=r*9e2%23e4
s=.7*r/w
x.fillRect(l-q,w/2-s*9,s,r)
l+=s}}

Feb 25 2017 12:43 PM UTC

}// 137/140

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hamptonio

remix of d/134 by u/icecuber

function u(t) {

r=Math.random;q=1;for(i=36;i--;)for(j=12;j--;)q+=.5-r()/2,x.setTransform(C(t+j),S(t+i),-S(t+j),C(t+i),i*66,j*99),x.fillRect(-9,-30,q/2,10)

Feb 25 2017 4:06 AM UTC

}// 138/140

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u/magna

I want a curtain like this in my living room!
u/joeytwiddle

That took me to http://www.pouet.net/prod.php?which=564#fukw…

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gormisdomai

function u(t) {

c.width=999
w=20
for(X=-6;X<7;X++)
for(Y=-6;Y<7;Y++){
x.beginPath();x.arc((X+S(t)*Y%7)*w+450,(Y+C(t)*X%7)*w+260,w,0,7,0);x.stroke()}

Feb 25 2017 1:05 AM UTC

}// 133/140

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u/iverjo

Cool, it almost looks like 3D
u/gormisdomai

You're right, maybe I should not try to make one which actually does the 3D rotation calculations

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aemkei

function u(t) {

c.width^=0;t||(I=140,p=[]);for(p[I++*I%41+
3178]=i=599;i++<3230;
)x.fillRect(i%70*20,i/70*20,p[
i]=p[i]+p[i+1]+p[i+69]+p[i+70]>>2,12);

Feb 24 2017 10:18 PM UTC

}// 134/140

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Fire and smoke

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u/iverjo

Neat!
u/donbright

dang this is cool.
u/sigveseb

can we add colors? :D
u/Kalanchoe

This is quite pretty!
u/Beginner

Needs colors :D
u/Xen

Color added: #3002
u/joeytwiddle

#fire

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roipoussiere

function u(t) {

c.width=100;b=(~~(t*10)).toString(2);for(i=0;i<16;i++) if(b[i]!=="1")x.fillRect( 71-3*i, 25, 2, 2);

Feb 24 2017 9:04 PM UTC

}// 99/140

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SpecialAgent

function u(t) {

a=1103515245,c=12345,m=0x7fffffff,z=t;for(i=111;i--;)z=((a*z+c)%m),g=z&0x3fffffff,z=((a*z+c)%m),h=z&0x3fffffff,x.fillRect(g%1e4,h%1e3,9,9)

Feb 24 2017 8:19 PM UTC

}// 138/140

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A pseudo-random number generator. The parameters you see is used in glibc, it gives a good visual on distribution. If you changed m=0x80000000 (m as used in IBM's C/C++) you will quickly see a bias in the randomness. Oh the irony! Here are some other popular parameters you can try: Borland C/C++: a=22695477,c=1,m=0x100000000 Turbo Pascal: a=134775813,c=1,m=0x100000000 Visual Basic 6: a=1140671485,c=12820163,m=0x1000000 Java: a=25214903917,c=11,m=0x1000000000000 Many more: https://en.wikipedia.org/wiki/Linear_congrue… 🕶

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u/iverjo

This is the probably the best PRNG dweet thus far
u/sigveseb

cool stuff
u/issafly

fullscreen it and stare into it like one of those stereograms for the extra special good.
u/SpecialAgent

thanks folks! also the speed is crippled for dramatic effect, change the loop to "for(i=1e3;i--;)" for turbo mode.
u/iverjo

Speaking of stereograms, it would be cool if anyone could create a stereogram dweet
u/SpecialAgent

Sorry for the malformed link to wikipedia, here is the corrected URL: https://en.wikipedia.org/wiki/Linear_congrue…

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hamptonio

function u(t) {

c.width=1920;q=y=8.48+1/t;z=27;for(i=0;i<5000;i++){q+=.1*(y-q);y+=.01*(q*(28-z)-y);z+=.01*(q*y-8*z/3);x.fillRect(q*20+900,y*20+500,3,3);}

Feb 24 2017 7:11 PM UTC

}// 137/140

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The Lorenz equations chaotic strange attractor

u/donbright

love this math / physics stuff!!!!
u/hamptonio

thanks! I'm better at math than javascript :)

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spbyrne

function u(t) {

λ=1920;Ω=1080;x.fillStyle=R(Ω/4,0,0,.01);x.fillRect(0,0,λ,Ω);for(i=0;i<35;i++){x.beginPath();x.arc(λ/2,Ω/2,(t/4)%1*i*i,t,-t);x.stroke()}

Feb 24 2017 7:01 PM UTC

}// 136/140

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u/katkip

dweet 1234

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