Dweets by u/donbright

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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donbright

remix of d/479 by u/lionleaf

function u(t) {

c.width=256;for(i=128;i--;)for(j=128;j--;){c=i*i+S(t)*j*j;c=(c<0?-c:c)%128;x.fillStyle=R(S(t+3.1)*c+c,0,S(t)*c+c);x.fillRect(64+i,8+j,1,1)}

Mar 4 2017 7:17 AM UTC

}// 140/140

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A transition from x*x+y*y (the Blue geometry, circles) to x*x-y*y (the Red geometry, hyperbolas). This shows a linkage between Binary Quadratic Forms and the Circles and Squares pseudo Fractal / Moiré pattern. By transitioning between two different Binary Quadratic Forms slowly, I hoped to show that the forms themselves are what form these patterns, not simply circles or hyperbolas or trig functions. Inspiration from many dweets on this site and Wildberger's Chromogeometry.

u/donbright

Binary Quadratic Forms are where you take any combination of x*x, y*y, and 2*x*y, for example 3*x*x+2*y*y (an ellipse), of x*x-y*y/2 (a squished hyperbola)

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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.

Show more comments…
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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donbright

remix of d/1491 by u/SpecialAgent

function u(t) {

t?c.width=w:w=512,h=w*9/16,d=x.createImageData(w,h)
for(X=0;X<w;X++)for(Y=0;Y<h;Y++)d.data[(X+Y*w)*4+3]=(X^Y+X&Y)%256
x.putImageData(d,0,0)

Feb 28 2017 1:40 AM UTC

}// 140/140

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a nice clean and simple Sierpinski gasket using XOR + AND

u/donbright

you can increase w to get a bigger pic but it becomes slow

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donbright

remix of d/1446 by u/sigveseb

function u(t) {

i=~~t%6;x.font='525px A',x.fillStyle='#'+'09F911,029D74,E35BD8,4156C5,635688,fff'.split(',')[i],x.fillText(i>4?'+C0':'█',i<5?i*384:770,684);

Feb 27 2017 1:15 AM UTC

}// 140/140

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free speech flag! tested ok on firefox/chrome, fonts may disturb other browsers

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donbright

remix of d/1399 by u/Kalanchoe

function u(t) {

r=Math.random
c.width^=0
t?o.push({X:1920*r(),Y:0,ẋ:0,ẏ:0}):o=[]
o.map(a=>(x.fillRect(a.X+=a.ẋ+=r()-0.5+S(t)/15,a.Y+=a.ẏ+=r(),15,15)))

Feb 26 2017 3:27 PM UTC

}// 135/140

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snowflakes

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u/Kalanchoe

oh, this is pretty!
u/Kalanchoe

Try setting initial y to y:-15 :)
u/iverjo

Speaking of snowflakes: https://www.dwitter.net/d/338
u/donbright

thanks. iverjo that is super cool! i wish i could figure out how to combine that with this.
u/sfz

Did it, but at 150 chars, will share remix if I can get it down to limit.
u/sfz

Eh, not the same subtlety, but this is what I've got https://www.dwitter.net/d/1479
u/sfz

New version where larger snowflaskes fall faster than smaller ones, but had to remove the random wind. https://www.dwitter.net/d/1520
u/donbright

nice
u/sfacci

confetti!
u/donbright

#particles

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donbright

remix of d/1283 by u/sfz

function u(t) {

c.width=960;i=t*t;j=19968+i;j>40959?s="fin":s=String.fromCharCode(j),x.font="500px Arial";x.fillText(s,250,450);x.fillRect(0,0,50,i*.026);

Feb 25 2017 3:29 AM UTC

}// 138/140

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Basic Unicode Chinese Character block 4E00–9FFF, (this is not all Chinese characters!). Progress bar on the left.

u/donbright

approx 20,900 characters
u/lionleaf

Wow! I mean, I know there are lots, but this just makes it seem incredible. To be fair I guess scrolling through and english dictionary would look pretty cool too (even though it's not quite the same)
u/Kalanchoe

oh, wow! I love it
u/donbright

thx
u/donbright

#unicode

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donbright

remix of d/1232 by u/iverjo

function u(t) {

a=2e3;c.width=a;for(i=2*a;i--;)p=S(t)*i/a+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(a/2+99*(S(p)+S(t)),i/4,99*d,1/(d+1)),x.fillStyle=R(i/9,d*a/8)

Feb 25 2017 1:54 AM UTC

}// 140/140

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u/iverjo

Nice :) Better colors than mine
u/iverjo

By saving golfing 2 characters I managed to make the twister bigger:
u/iverjo

c.width=a=2e3;for(i=2*a;i--;)p=S(t)*i/a+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(a/2+199*(S(p)+S(t)),i/4,199*d,1/(d+1)),x.fillStyle=R(i/9,d*a/8)
u/iverjo

A little more movement: c.width=a=2e3;for(i=2*a;i--;)d=C(p=S(t)*i/a+i%4/.637)-S(p),d>0&&x.fillRect(a/2+199*S(p)+399*C(t),i/4,199*d,1/(d+1)),x.fillStyle=R(i/9,d*a/8)
u/donbright

wow that is awesome!!! i really do miss how yours spins all the way around.
u/donbright

#twister

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donbright

remix of d/1055 by u/paberr

function u(t) {

x.font="99px Arial";for(i=64;i;i--)w=3+i%8<<7,h=i/8<<7,(i/8^i)%2?x.fillRect(w,30+h,128,128):1,x.fillText(i%29<1?"♚":i%37<1?"♔":" ",w+20,h)

Feb 24 2017 7:27 AM UTC

}// 138/140

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stalemate!

u/5Mixer

Chess pieces were a nice touch :)
u/sigveseb

cool ^^
u/donbright

#chess

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donbright

remix of d/869 by u/maysick

function u(t) {

c.width=1e3;半=500;for(i=1;i<99;i++)b=(i*(1e3+14*t)/半),x.fillStyle=R(半*S(b),半*S(i),半*C(b)),x.fillRect(-b/9+半+b*C(b),-b/9+250+b*S(b),b/5,b/5)

Feb 23 2017 1:30 AM UTC

}// 139/140

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just adding color to @maysick 's beautiful spiral

u/maysick

nice!

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donbright

function u(t) {

for(i=t;i>-t;i-=10)for(j=-t;j<t;j+=10){r=i*i-j*j,b=i*i+j*j,g=2*i*j;x.fillStyle=R(r%256,g%256,b);x.fillRect(1000+10*t*r/b,400+10*t*g/b,1,1);}

Feb 23 2017 12:19 AM UTC

}// 140/140

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slow burning. more fun with rational paramterization of circles

u/donbright

#notrig

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