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.

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

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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:S(t*t),V:C(t*t)}):o=[]
o.map(a=>{a.X+=a.U,a.Y+=a.V,x.fillRect(a.X,a.Y,9,9)})

Mar 16 2017 7:25 AM UTC

}// 111/140

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inspired by Todd Hopkinson http://codegolf.stackexchange.com/questions/…

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donbright

remix of d/1871 by u/walsh9

function u(t) {

圈=(n,d,N,D)=>{d+D<15?(圈(n,d,n+N,d+D),圈(n+N,d+D,N,D),w=2e3,m=d+D,x.beginPath(),r=w/m/m/2,x.arc(w*(n+N)/m,r,r,0,7),x.fill()):1}
圈(0,1,1,1)

Mar 7 2017 11:35 PM UTC

}// 136/140

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basic Ford's Circles (sort of like Apollonian Circle Packing but every circle touches the floor, or here, the ceiling)

u/donbright

#math
u/donbright

see also https://www.dwitter.net/d/15086 by @taupelink
u/donbright

#numbertheory
u/taupelink

nice!

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donbright

remix of d/1399 by u/Kalanchoe

function u(t) {

c.width^=0
t?o.push({X:1,Y:1,U:S(t),V:C(t)}):o=[]
o.map(a=>{Q=a.X**2+a.Y**2,a.X+=a.U-=a.X/Q,a.Y+=a.V-=a.Y/Q,x.fillRect(a.X,a.Y,9,9)})

Mar 28 2017 1:45 AM UTC

}// 133/140

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Another fake gravity sim. This time, some particles get slingshotted out of the system, past escape velocity, others teeter on the brink, and others congregate at 0,0. After a while, the screen is full of a bunch of particles leaving, and others coming back in towards the origin.

Show more comments…
u/nonce

your gravity sims are amazing.
u/z3vin

agreed
u/donbright

thanks this site is very inspiring
u/alien

WOW ,Hi what does this mean :D c.width^=0
u/donbright

alien it basically clears the screen to the default width. in detail, i think it is combining "binary xor" with "set equal to", so basically c.width = c.width xor 0, and since anything xored with 0 is itself, its basically setting c.width to itself.
u/donbright

#physics

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donbright

remix of d/1816 by u/SpecialAgent

function u(t) {

t?Δ=[]:P=[99,0,0,0,1,0,0,.6]
for(Q=i=4;i--;)Q+=(Δ[i]=P[(2+i)%4]-P[i])**2/2
for(j=4;j--;)x.fillRect(P[i=j*2],P[i+1],2,2),P[j]+=P[j+4]+=Δ[j]/Q

Mar 24 2017 11:16 PM UTC

}// 140/140

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Quickstart - alter numbers in P for fun patterns. Long description - this is a simulation of two body gravitational motion using a simplified form of Calculus.

u/donbright

combine F=ma with F=GM1M2/R^2 except that G=1, M1=1, M2=1 and r^2 is r
u/donbright

Explanation here https://www.patreon.com/posts/simulating-in-…
u/donbright

oh btw P[x1,y1,x2,y2,xv1,yv1,xv1,yv2] where 1,2 = object 1,2, x,y=position, v = velocity initial
u/codeslaw

This is incredible!
u/donbright

#physics

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donbright

remix of d/2238 by u/aemkei

function u(t) {

r=500;c.width^=0;
t?φ.push(t):φ=[]
φ.map(φ=>{
x.fillStyle='hsl('+r*C((λ=φ*r)/2)+',99%,50%)'
x.fillRect(C(φ)*S(λ+t)*r+999,S(φ)*r+r,9,9);
})

Mar 21 2017 10:52 PM UTC

}// 138/140

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progressive trance planet

u/sfz

Morten Granau works love it

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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) {

c.width=960;半=480;垂=270;for(i=-t;i<t;i+=2)for(j=-t;j<t;j+=2){b=i*i+j*j;r=i*i-j*j;g=2*i*j;x.moveTo(半,垂);x.lineTo(半+垂*r/b,垂+垂*g/b)}x.stroke()

Feb 22 2017 3:22 AM UTC

}// 140/140

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rational parameterization of the circle (no sine or cosine)

u/donbright

#notrig

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donbright

function u(t) {

c.width=2e3
Y=(a,b)=>a+50*S(i/b+t)
F=(i,j)=>x.fillRect(i,j,4,4)
for(i=2e3;i--;){
F(i,j=Y(340,100))
F(i,k=Y(540,150))
F(i,j+k-140)
}

May 19 2023 3:31 AM UTC

}// 131/140

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bottom wave = sum of other two waves

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donbright

remix of d/23883 by u/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 5:48 PM UTC

}// 126/140

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Prime fun 2 / 3 - Normally X binary XOR with Y produces a single white line, but if we only draw black when X XOR Y is a prime number, then we get a pattern. #math #primes

u/donbright

(note i have flipped black/white in my caption, actually its drawing black when the number is not prime)
u/rep_movsd

Fascinating
u/Joachim

#circuit

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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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