Top dweets by u/hamptonio

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #ScaryMovies

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hamptonio

function u(t) {

c.width=2e3;q=y=.1;z=C(t);for(i=0;i<9e3;i++){q+=.2*(y-.15*S(3*q))-q/1e3;y+=(q-y+z)*.04;z+=-.28*y;x.lineTo(q*300+900,y*800+400);}x.stroke()

Feb 26 2017 7:20 PM UTC

}// 138/140

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A Chua circuit-like ODE with chaotic attractors

u/donbright

brilliant!

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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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hamptonio

function u(t) {

t?i++:i=0;q=0;a=1;b=1;for(j=99;j--;){q+=a*C(b*i/100);a*=.6;b*=8};x.lineTo(i,250*(2+q));x.stroke()

Mar 3 2017 3:31 PM UTC

}// 97/140

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From 1872, Weierstrass's first example of a continuous but nowhere-differentiable function.

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hamptonio

function u(t) {

t?i++:i=0;for(j=1e3;j--;){a=i/1e3-2;b=j/2e3-.25;for(k=12;k--;){q=a*a+b*b;q*=q;c=2*a+(a*a-b*b)/q;b*=2*(1-a/q)/3;a=c/3}x.fillRect(i,j,1,S(a))}

Mar 1 2017 7:53 AM UTC

}// 140/140

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Newton's method on z^3-1.

u/iverjo

Would this draw faster if we draw from top to bottom rather than from left to right?
u/hamptonio

Nice - you are right, that is faster.

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hamptonio

remix of d/1660 by u/hamptonio

function u(t) {

t?i++:i=0;for(j=2e3;j--;){a=j/1e3-2;b=i/2e3-.25;for(k=12;k--;){q=a*a+b*b;q*=q;c=2*a+(a*a-b*b)/q;b*=2*(1-a/q)/3;a=c/3}x.fillRect(j,i,1,S(a))}

Mar 1 2017 10:21 PM UTC

}// 140/140

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Thanks to iverjo for the speedup from #1660.

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hamptonio

function u(t) {

w=c.width=128;for(i=2;i<w*w;i++){s=i;for(k=0;s>1;k++){s=s%2?3*s+1:s/2};x.fillStyle=`hsl(${k*.9},80%,${k/3}%)`;x.fillRect(i%w,i/w|0,1,1);}

Mar 1 2017 9:38 PM UTC

}// 137/140

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Visualization of Collatz sequences: https://en.wikipedia.org/wiki/Collatz_conjec…

u/taupelink

#collatz
u/taupelink

Dwitter engine may have been updated since this dweet was posted...you can add "if(!t)" at the beginning although that bumps it up past 140 characters...
u/taupelink

#collatz

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hamptonio

remix of d/1619 by u/New_Core

function u(t) {

w=c.width=256;for(i=w*w;i--;)a=255*S(w),x.fillStyle=R(a,a,a,Math.random()),x.fillRect(i%w,i/w|0,1,1);x.font='5em A';x.fillText("ಠ_ಠ",69,90);

Mar 1 2017 4:25 PM UTC

}// 140/140

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I like New_Core's use of a single loop to get two coordinates; I think this is a slight improvement on that aspect.

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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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hamptonio

remix of d/1763 by u/New_Core

function u(t) {

if(!t)a=new(window.AudioContext)(),o=a.createOscillator(),o.connect(a.destination),o.start(a);o.detune.value=220*S(t+S(t*t))

Mar 2 2017 9:26 PM UTC

}// 124/140

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Remove "a" from "o.start(a)" to begin the annoyance. This golfing tweak to New_Core's should allow for more complexity to be added...

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u/iverjo

116 characters: if(!t)a=new(AudioContext)(),o=a.createOscillator(),o.connect(a.destination),o.start();o.detune.value=220*S(t+S(t*t))
u/iverjo

115 characters: t||(a=new(AudioContext)(),o=a.createOscillator(),o.connect(a.destination),o.start());o.detune.value=220*S(t+S(t*t))
u/iverjo

Room for 25 more characters of fun! :D
u/hamptonio

if(!t){a=new(AudioContext)();o=[];for(i=6;i--;){q=o[i]=a.createOscillator();q.connect(a.destination);q.start()}}o[t%6|0].detune.value+=S(t)
u/hamptonio

multivoice above
u/iverjo

#audio

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hamptonio

remix of d/1376 by u/cucumberOwl

function u(t) {

i=new Image();i.src="https://tinyurl.com/jgtokhq";x.drawImage(i,700+S(3*t+S(t))*500,200+C(t+S(2*t))*200,100+2*t*t,100+5*t*t);

Feb 26 2017 5:41 AM UTC

}// 125/140

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