Top 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: #Opposites

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donbright

function u(t) {

質=(n)=>{for(j=2;j<n;j++){if (n%j==0)return n}return 0}
格=7
for(X=299;X--;)
for(Y=299;Y--;)
if (質(X&Y)) x.fillRect(格*X,格*Y,格,格)

Sep 19 2021 5:40 PM UTC

}// 128/140

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Prime fun 1 / 3 - This is the standard X&Y (binary AND) Sierpinski triangle picture but only where X & Y is a prime number. perhaps revealing a relationship between primes and binary AND #math #primes

u/donbright

(note white = X&Y is prime, black = X&Y is composite)
u/andrea270872

this is really nice. retro and mathsy at the same time!
u/donbright

#Sierpinski

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donbright

remix of d/14974 by u/donbright

function u(t) {

宽=999
for(i=-宽;i<宽;i+=9)for(j=-宽;j<宽;j+=9){
b=i*i+j*j
r=i*i-j*j
g=2*i*j
n=frame+99
x.fillStyle=R(r*r%n,g*g%n,b*b%n)
x.fillRect(i+宽,j+宽,9,9)}

Nov 13 2020 7:18 AM UTC

}// 140/140

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#symmetry

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donbright

remix of d/14804 by u/taupelink

function u(t) {

c.width=400
for(i=N=t>>33<<32;i>0;i--)
for(k=90;k--;){U=200+k*S(t+i)
V=99+k*C(t+i)
N%i?0:k>80?(x.fillText(i,U,V),k=80):x.fillRect(U,V,2,2)}

Jun 28 2019 11:57 PM UTC

}// 139/140

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prime o'clock in the morning

u/donbright

thanks to @taupelink for inspiration
u/taupelink

yay!
u/joeytwiddle

Fascinating! #primes #math U=200+k*S(a=i/1.91),V=99-k*C(a)

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donbright

remix of d/14532 by u/rodrigo.siqueira

function u(t) {

for(X=-(气=299);X<气;X+=9)for(Y=-气;Y<气;Y+=9){
Q=S(t)*(X*X)+C(t)*(Y*Y)
左=X*Q
右=Y*Q
x.fillStyle=R(左*Q,右*Q,255*S(t))
x.fillRect(960+X,550+Y,9,9)}

Jun 12 2019 12:30 AM UTC

}// 140/140

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1986 forever

u/donbright

#cga
u/CalSch

Who needs hallucinogenics when you have things like this on dwitter

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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/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/2839 by u/alien

function u(t) {

w=c.width=115
for(j=w;j--;)
for(i=w;i--;)q=2*i*j*S(t)+C(t)*(i**2+j**2),x.fillStyle=R(s=(q*q*frame>>t)%255,s,s*3),x.fillRect(i,j,1,1)

Jul 10 2017 3:22 AM UTC

}// 132/140

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remixing @alien color + code with some of my old binary quadratic forms stuff (aka circles and squares pseudo fractals)

u/cantelope

cool donbright
u/donbright

thx cantelope

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donbright

remix of d/2372 by u/cantelope

function u(t) {

x.globalAlpha=.08
半=500
x.fillRect(0,0,i=w=2e3,w)
for(i=500;i--;){
Math.random()>.9998?T=t-.19:T=t
x.clearRect(2*半+i*C(T),半+i*S(T),8,8)
}

Apr 1 2017 1:55 PM UTC

}// 137/140

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99 luftballons

u/magna

Will golf this a bit to open up some space for the possibility of making this in green.
u/magna

Still not enough: https://www.dwitter.net/d/2375
u/magna

The time warping is a genius idea BTW!
u/donbright

thanks good luck on green
u/donbright

update to future ppl: see @mxfh https://www.dwitter.net/d/2408

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donbright

remix of d/1399 by u/Kalanchoe

function u(t) {

c.width^=0
t?o.push({X:1e3,Y:500,U:9*S(t),V:t%9}):o=[]
o.map(a=>{a.X+=a.U+=a.X>1e3?-.1:.1,a.Y+=a.V+=a.Y>500?-.1:.1,x.fillRect(a.X,a.Y,9,9)})

Mar 15 2017 12:03 AM UTC

}// 140/140

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donbright

remix of d/1863 by u/SpecialAgent

function u(t) {

c.width=1024;w=64;for(i=w*w;i--;)X=i%w,Y=i/w>>0,P=128*((1-t*t)*X*X/(1+t*t)+2*t*Y*Y/(1+t*t)),x.fillRect(200+X*10,Y*10,P%11,P%11)

Mar 11 2017 2:03 AM UTC

}// 129/140

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No Sine or Cosine were harmed in the making of this demo. It is not random - and if it runs long enough it should theoretically become a still image

u/sfz

Those ripples are tripping me out
u/donbright

note to future self - this varies from x*x + y*Y to x*x-y*y (circle to hyperbola) by using the rational parameterization of the circle with one variable parameter, where (1-t**2)/(1+t**2) is an alternate to cosine and 2t/(1+t**2) is an alternate to sine. (or vice versa i forget lol)
u/magna

Awesome!
u/z3vin

So cool

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