Hot 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.

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

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donbright

remix of d/10189 by u/QXY

function u(t) {

c.width=720
for(i=80;i--;)for(j=40;j--;){I=i-t*t
J=j-20
B=I*I+J*J
I=i-40
G=I*I+J*J
x.fillStyle=R(B%G%256,0,G%B%256)
x.fillRect(i*9,j*9,9,9)}

Oct 1 2018 6:19 AM UTC

}// 140/140

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black holes crash, flip universe colors

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donbright

function u(t) {

c.width^=0
for(r=200;r--;)
for(a=199;a<1e3;a+=200)
θ=2*Math.asin(r/a*C(t)),
x.fillRect(1e3+r*(θ+S(θ)),200-r*(-3-C(θ)),9,9)

Sep 11 2018 5:40 AM UTC

}// 123/140

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This is a set of 5 isochronous cycloidal pendulums, based on equations from Wikipedia. https://en.wikipedia.org/wiki/Cycloid and Rem088roy's illustration. Each pendulum takes the same amount of time to reach the 'bottom' because the bottom end of each one follows a Tautochrone Curve. https://en.wikipedia.org/wiki/Tautochrone_Cu… #cycloid #physics #pendulum #huygens

u/donbright

it's not perfectly accurate but its kind of close...
u/DataMeta

#smooth

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donbright

function u(t) {

c.width=2e3
for(i=0;i<t*t;i++){Φ=Math.acos(1-2*i/t/t)
Θ=10.1664*i
x.fillRect(
500*(2+C(Θ)*S(Φ)*S(t)+C(Φ)*C(t)),
500*(1+S(Θ)*S(Φ)),9,9)}

Sep 7 2018 4:57 AM UTC

}// 135/140

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Evenly spaced points on a sphere, based on CR Drost's phyllotaxis sunflower cylyndrical equal area map in python: https://stackoverflow.com/questions/9600801/…

u/joeytwiddle

Useful! #sphere
u/Odog8

Love me a PHI sphere in the morning!

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donbright

remix of d/9639 by u/joeytwiddle

function u(t) {

x.fillRect(0,0,W=c.width=399,W);for(j=20;j--;x.shadowBlur=j)x.lineTo(S(t*j)*199,C(j*t)*199),x.strokeStyle=x.shadowColor=R(W,W,W),x.stroke();

Sep 5 2018 4:54 AM UTC

}// 140/140

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really simple based on Joey Twiddle's work but i kind of like it.

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donbright

remix of d/6160 by u/zanella

function u(t) {

Q=(x,y)=>x*x+y*y
for(i=N=128;i--;)for(j=N;j--;)B=Q(i,j),G=Q(N-i,16-j),P=Q(9-i,N-j),x.fillStyle=R(P%B%G,B%G%P,G%P%B),x.fillRect(i*8,j*8,8,8)

Jan 25 2018 1:02 AM UTC

}// 139/140

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zanella got me thinking more about math... d/6378 was basic color... this doesn't look like much but the theory is interesting to me....a circles-and-squares pseudo fractal, but with the added idea of "centers of gravity" from which the modular arithmetic create patterns against each other. it's incredibly slow so animation is almost pointless. but i like the idea still.

u/iverjo

cobweb

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donbright

remix of d/6294 by u/nickd3000

function u(t) {

Q=(x,y)=>x*x+y*y
for(i=N=128;i--;)for(j=N;j--;)B=Q((半=64)-i,半-j-S(t/3)*半),G=Q(半-i-C(t)*半,半-j),x.fillStyle=R(B%G,G%B),x.fillRect(i*8,j*8,8,8)

Jan 23 2018 4:35 AM UTC

}// 140/140

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note to future self... this is some kind of weird combination of interference patterns between waves, and circle-squares fractals ....to see whats going on, start out with fillstyle=R(B%256,0,0) then work from there.

u/donbright

note to future self... this is some kind of weird combination of interference patterns between waves, and circle-squares fractals ....to see whats going on, start out with fillstyle=R(B%256,0,0) then work from there.
u/donbright

in other words, it's not drawing the "lines of force", those lines are an artefact of the remainders of the 'quadrance' (squared distance) between the two black balls

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donbright

remix of d/3697 by u/Citiral

function u(t) {

w=1920;for(c.width=i=w;i-=10;)for(j=w;j-=10;){
d=(i*i+S(3.14*(i/w))*j*j)/frame
o=d%9
x.fillRect(i,j,o,o)}

Jan 2 2018 3:15 AM UTC

}// 105/140

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u/joeytwiddle

I was about to comment "donbright would like this one" but then suddenly ... !
u/magna

Wow!
u/Xen

one of my new fav's, love this!

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donbright

remix of d/3604 by u/Xen

function u(t) {

c.width=2e3;帧=frame/9;for(i=-帧;i<=帧;i+=9)for(j=-帧;j<=帧;j+=9)红=i*i-j*j,蓝=i*i+j*j,半=960,x.moveTo(半+i,j),x.lineTo(半+半*红/蓝,半*i*j*2/蓝);x.stroke()

Dec 6 2017 5:01 AM UTC

}// 140/140

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harmony of 9

u/donbright

interesting fact: there are no curved lines, they are all straight. and there are no trig functions.
u/Xen

love it :-)

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donbright

remix of d/3119 by u/Xen

function u(t) {

x.globalAlpha=.008
半=500
x.fillRect(0,0,i=w=2e3,w)
for(i=(3e3);i--;)x.clearRect(frame*(i*i-(j=t*i%frame)*j)/(b=j*j+i*i),999-2*i*j*i/b,2,4)

Aug 29 2017 9:24 PM UTC

}// 138/140

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thx Xen

u/Xen

Welcome ;-)
u/Xen

i just remixed your remix of my remix of your dweet, trying to message you, find me @xen_the
u/alien

wow

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donbright

remix of d/3115 by u/joeytwiddle

function u(t) {

东=122,北=123;for(i=999;i--;){j=(东*i)%frame-frame,k=北*i/frame-frame,b=j*j+k*k,r=j*j-k*k,g=2*j*k,x.fillRect(900+i*r/b,400+i*g/b,3,3)}

Aug 29 2017 4:05 AM UTC

}// 130/140

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"The Great Something"

u/donbright

oh, note, alter 东 and 北 to get different patterns.
u/joeytwiddle

H̀̕E̸͞ ̛̕͜C͡O̷M̷͜E̸͟S͢͜
u/Xen

n̎ͭͫ͐͛ͫ͌͂̇̾͆͋̍̾̈́ͨͤͨ҉͜͠o̷̶͛ͮ͗́̚͝ơͥ̆ͦͧ̇̅̋̅ͨͮ̃ͫ͂̌̐̓҉͏̵oͦ͂̂̅͑ͩͭ̒ͧ̀̚͠o̧ͤ͌ͩ̏ͨ͏͝

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