Dwitter - javascript demos in 140 characters

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: #Food

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donbright

remix of d/2001 by u/jonbro

function u(t) {

W=(p)=>(p<0?-p:p)%256
for(i=1920;i-=16;)for(j=1080;j-=12;)p=C(t/3)*i*i+S(t/9)*j*j,x.fillStyle=R(W(p/5),W(p/9),W(p/3)),x.fillRect(i,j,16,12)

Mar 10 2017 1:25 AM UTC

}// 139/140

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remixing jonbro and netgrind 's use of color in circle / square style patterns. added some hyperbolas. longer you stare at this the weirder the patterns get - it doesnt' repeat for quite a long time

u/SpecialAgent

This is very hypnotic

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pangolin

function u(t) {

function f(y,z){x.arc(a,a,y,4.7,z+4.7);x.stroke();}a=90;c.width=400;d=Date.now()/10000%4320;f(20,d%6);f(60,d/6%60/9.5);f(a,d/a/9.5);

Mar 12 2017 3:01 AM UTC

}// 132/140

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Clock (UTC)

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recursive

remix of d/2036 by u/nick

function u(t) {

x[f="fillStyle"]="#00a"
x.fillRect(0,0,960,540)
x[f]="#fff"
for(i=50;i--;x.font='5em a')x.fillText("★",i%5.5*160+40,80+(i/5.5|0)*52)

Mar 11 2017 1:59 AM UTC

}// 132/140

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Stars but no stripes

u/nick

It's going to be hard to combine the two patterns.
u/nick

How do you get the "remix" text on your dweets?
u/recursive

Edit the dweet you want to remix rather than starting a new one.

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nick

function u(t) {

g=k=>x.fillStyle=R(k,0,Math.abs(k-255))
for(i=0;i<8;i++)
x.fillRect(0,i*155,1920,75)
g(0)
x.fillRect(0,0,960,540)
g(255)

Mar 11 2017 1:09 AM UTC

}// 120/140

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remix of d/2012 by u/kchplr

function u(t) {

for(i=99;i--;A=T%6.35,r=50+((T*0.15|0))**1.15*10,r+=C(T*2-r)*r/122,x.fillRect(960+S(A)*r-r/94,500+C(A)*r-r/20,2+r/42,2+r/45))T=t*84+i/9

Mar 11 2017 11:03 AM UTC

}// 135/140

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u/sfz

I want to touch it

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hypothete

function u(t) {

sf=80;x.globalAlpha=0.1;x.drawImage(c,-sf+sf*S(t),-sf+sf*S(t/2)/2,1920+2*sf,1080+2*sf);
x.font='200px Arial'; x.fillText('🍄',810, 540);

Mar 8 2017 8:57 PM UTC

}// 135/140

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nick

function u(t) {

r=h=>(h*Math.random()-h/2)
y=t**2
a=r(y)
b=r(y)
d=(a*a+b*b)**.5
for(j=0;j<d;j++)
x.fillRect(j*a*20/d,j*b*10/d,5,5)

Mar 10 2017 11:30 PM UTC

}// 114/140

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Online Dwitter Start Tutorial and Primer: http://nickpisca.com/sherpa/?p=600

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sfz

remix of d/1962 by u/sfz

function u(t) {

w=950
V=t%13+3
for(i=V;i>0;i-=2/w)x.fillStyle=`hsla(${7*t*i},66%,66%,.2)`,x.fillRect(w+w*S(t*i+2*V),w/2+w/2*S(V*i+2*t+3),V,V)

Mar 8 2017 7:22 PM UTC

}// 125/140

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Harmonograph II.2

u/donbright

i like these colors
u/sfz

I call it Mathematician's Plaid

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hypothete

function u(t) {

f=Math.random;
z=100;
for(i=0;i<z*2;i++){
d=i%20;e=i/20|0;d+=e%2;
j=2+S(d*1.1+t*4);
x.font=j+'em a';
x.fillText('👀',d*z,e*z);
}

Mar 11 2017 6:24 AM UTC

}// 128/140

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hypothete

remix of d/2057 by u/hypothete

function u(t) {

d=x.getImageData(0,0,w=c.width=255,h=144);for(i=0;i<d.data.length;i+=4){n=w*(i/4%w)/w;d.data.set([n,0,w-n,w],i);}x.putImageData(d,0,0)

Mar 11 2017 8:20 PM UTC

}// 134/140

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u/recursive

Direct pixel manipulation. Interesting approach but it looks like it might always be larger. Does this have a dweeting application?
u/hypothete

I'm not sure. I put this one together in case people had ideas on how to shrink it.
u/veubeke

@hypothete new ImageData(W,H) saves some bytes as does incrementing i by 1 instead of 4 and calculating image data size manually. https://www.dwitter.net/d/2069