Dweets awesomed by u/xuv

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: #ScaryMovies

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puckipedia

function u(t) {

c.width+=0,c.onmousemove=d=>a=d.clientX*3;z=(t?z:Array(f=1e3).fill([a=f,0])).map(([w,e],i)=>(x.fillRect(w,i,9,9),[w+e*i/f+e/9,(e*6+a-w)/9]))

Mar 1 2017 7:29 PM UTC

}// 140/140

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Just a wobbly line.

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u/sfz

was staring at this waiting for something to happen longer than I like to admit XD
u/lionleaf

Amazing. Love these interactive ones
u/iverjo

+1 for the physics :D
u/iverjo

mildly entertaining to play with
u/hamptonio

nice!
u/recursive

I learned something new! Destructuring assignment!
u/iverjo

#interactive
u/katkip

#physics

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New_Core

function u(t) {

w=c.width=128;for(i=w*w;i--;)x.fillStyle=R(0,0,0,Math.random()),x.fillRect(i%w,i%(w-1),1,1);x.font='5em A';x.fillText("☠",25,65);

Feb 28 2017 8:16 PM UTC

}// 129/140

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I did one with ImageData but the skull didnt fit in. (it was faster but not fast enough to size it up).

u/sfz

swank!
u/New_Core

#noise

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xuv

function u(t) {

c.width=1920;w=c.width/2;
for(i=0;i<w;i++){
x.fillRect((-1+w)+i*S(t), 0, 1, c.height)}

Feb 24 2017 9:01 PM UTC

}// 86/140

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dh7

function u(t) {

c.width=1920; /* Feel like I'm 11 now */
for(i=0;i<777;i++){
  r=S(t)*400+C(t+i*t/7777)*100
  x.fillRect(960+r*C(t+i), 520+r*S(t+i), 7, 7) }

Feb 24 2017 8:49 PM UTC

}// 140/140

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u/sigveseb

with comments :)

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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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iverjo

remix of d/89 by u/iverjo

function u(t) {

c.width^=0;for(i=5e3;i--;)p=3*t+S(t/2)*i/3e3+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(960+199*S(p)+249*S(t/.7+i/6e3),i/4-2,199*d,1/(d+1))

Feb 24 2017 6:50 PM UTC

}// 133/140

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u/SpecialAgent

nicely done!
u/Kalanchoe

Flawless!
u/donbright

oh wow, the shading!
u/sigveseb

Good twister! Can we add color?
u/iverjo

Color would be awesome :) Feel free to try to add it
u/sigveseb

https://www.dwitter.net/d/1267 red
u/iverjo

Here's a purple version. Had to make some compromises. https://www.dwitter.net/d/1278
u/donbright

i attempted a rainbow version https://www.dwitter.net/d/1282
u/iverjo

#twister
u/vain

nice twister

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FurkanTuran

function u(t) {

c.width=1920;x.beginPath();for(i=0;i<15;i++)x.arc(960,540,(80*i+100*t)%1200,0,2*Math.PI);x.lineWidth=40;x.stroke();

Feb 24 2017 6:32 PM UTC

}// 115/140

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hamptonio

function u(t) {

a=960;r=Math.random,!t&&(p={x:a,y:540,c:0,d:0}),p.c+=r()-r()-(p.x-960)/a,p.d+=r()-r()-(p.y-540)/a,p.x+=p.c,p.y+=p.d,x.fillRect(p.x,p.y,3,3);

Feb 24 2017 4:47 PM UTC

}// 140/140

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Remix of one by Niklas

u/lionleaf

(If you do the edit and post directly from another dweet they will link up and you'll get the "remix of #xxx by xyz" tag :) )
u/donbright

drunk electron?
u/hamptonio

just messing around, this is my first day!

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