Dweets by u/rodrigo.siqueira

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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rodrigo.siqueira

remix of d/15411 by u/rodrigo.siqueira

function u(t) {

v=(a,b,Φ,r)=>{for(i=0;i++<r;x.globalAlpha=.05)x.fillRect(a-=S(Φ),b-=C(Φ),s=r/42,s)
r>8&&v(a,b,Φ+S(t*i**9)/4,r*=.9)}
v(960,540+300*C(t),t,99)

Aug 20 2019 1:03 AM UTC

}// 140/140

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Dendritic projections

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rodrigo.siqueira

remix of d/14415 by u/rodrigo.siqueira

function u(t) {

x.fillRect(0,0,2e3,2e3)
v=(a,b,Φ,r)=>{for(i=0;i++<r;)x.clearRect(a-=S(Φ),b-=C(Φ),s=r/9,s)
r>8&&v(a,b,Φ+S(t*i**9)/2,r*=.9)}
v(940,1e3,0,99)

Aug 14 2019 1:21 AM UTC

}// 138/140

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Tesla rays #organic

u/KilledByAPixel

Φ

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rodrigo.siqueira

remix of d/15329 by u/tomxor

function u(t) {

for(a=b=0,i=1e4*(t<9);i--;x.fillRect(a*640,b*800-500,1,.1)) 
r=1|Math.random()*3,
a+=(r-a+b*C(b*3))*.5,
b+=(2-a*b+C(b*3))*.25

Aug 13 2019 12:05 PM UTC

}// 125/140

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Chaos Photographer, Pic 1, Remix 1 #spiral

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rodrigo.siqueira

remix of d/12440 by u/rodrigo.siqueira

function u(t) {

t||(a=b=0)
for(i=5e3;i--;)x.fillStyle=R(C(a)*200,S(a)*b/3,t*42),x.fillRect(960+b*S(a*.8),540-b*C(a*.8),1,1),a+=1.9*C(2.5*a)+C(t/5),b+=.00076

Jul 7 2019 9:15 PM UTC

}// 140/140

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Feigenbaum Flower. Homage to Mitchell Feigenbaum (1944-2019). He demonstrated the universal character of dynamical non-linear systems, which has made possible the systematic study of chaos. In 1975, using the small HP-65 calculator, he discovered that the ratio of successive distances between bifurcation events tends to a constant δ ≈ 4.66920... This "ratio of convergence" of period-doubling bifurcations is now known as the first Feigenbaum constant. #bifurcation #attractor #fractal #chaos #math

u/taupelink

This is a great tribute. RIP.
u/donbright

really nice
u/artfarnaa

Rodrigo - are you working full time on this fractal stuff? Super impressive if its only a hobby. Great work.
u/rodrigo.siqueira

#tribute

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rodrigo.siqueira

function u(t) {

for(c.width=w=i=2e3;i--;)
X=S(i*i),Y=S(i),ℵ=C(Math.atan2(X,Y)-t)*Math.hypot(X,Y),
K=w/2,x.fillRect(w*ℵ/(Z=4+C(t)+X*X-Y*Y)+K,w+K*(ℵ-6)/Z,7,8)

Jun 26 2019 7:01 PM UTC

}// 140/140

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The Hyperbolic Paraboloid (z=x²-y²). The S(i*i) and S(i) are random number generators between -1 and +1. The atan2 and hypot are used to calculate 3d object rotation (Euler equations could also be used, as seen on /d/12086). Thanks to u/cantelope for the Tiny 3D Engine Tutorials: https://cantelope.org/tiny_3D/ and https://cantelope.org/3D/ #math #hypot #D3 #hyperbolic #surface

u/cantelope

:D
u/rodrigo.siqueira

There is an interesting fact that the Pringles potato chips are a truncated hyperbolic paraboloid. The strength of the shape helps to prevent them from breaking while stacked. The curvature of the shape improves resistance to tension and compression forces. Remember this next time you eat a hyperbolic paraboloid.

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rodrigo.siqueira

remix of d/13412 by u/rodrigo.siqueira

function u(t) {

if(t<1)with(x)fillStyle=R(9,20,70),fillRect(0,0,42,99),rotate(Math.PI*.8),translate(-420,-800),drawImage(c,0,0,1e3,1e3),translate(-920,-450)

Jun 23 2019 10:23 PM UTC

}// 140/140

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Blue Starfield - color version

u/donbright

rodrigo you are a legend. if you wrote a book i would buy it

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rodrigo.siqueira

remix of d/12640 by u/rodrigo.siqueira

function u(t) {

if(!t){X=Y=Z=1;for(i=2.3e5;i--;x.fillStyle=R(i/270,i/1e3,Z*2))Z+=(X*Y-Z)/59.1,X+=(Y-X)/11,Y+=X*(28-Z)/99,x.fillRect(960+X*48,1200-Z*24,3,4)}

Jun 23 2019 1:01 AM UTC

}// 140/140

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Lorenz Attractor in color - this will be printed and framed. #lorenz #attractor

u/katkip

you really like #chaos math and attractors
u/taupelink

With good reason, I think :) They are beautiful and, well, strange
u/KilledByAPixel

You should frame the code along with the image ;) Awesome work.
u/rodrigo.siqueira

The prints are ready! Yes, source code is printed with images. https://twitter.com/rsiqueira/status/1143629…

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rodrigo.siqueira

remix of d/14006 by u/rodrigo.siqueira

function u(t) {

for(w=i=1920;i--;x.fillStyle=R(i/9),x.fillRect(w*X/Z*(C(Z/20-Y/40))+w/2,w*Y/Z/9-Z*520-4e3,.5,.5))X=C(i/t)*4,Y=C(i)*9,Z=S(s=X*X+Y*Y/12-1)/s-9

Jun 20 2019 8:28 PM UTC

}// 140/140

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Red sombrero

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rodrigo.siqueira

remix of d/14654 by u/rodrigo.siqueira

function u(t) {

if(t<14)for(X=Y=S(t*3)*950,x.fillStyle=R(C(Y)*220,Y/9,S(Y)*Y/4),i=1e4;--i;x.fillRect(960+X+Y,380-Y+X,1,1))X=10+Y+Math.abs(Y=-X)/1.08

Jun 19 2019 7:35 PM UTC

}// 132/140

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The Gingerbreadman map is a discrete-timedynamical system. #gingerbreadman

u/joeytwiddle

Vitruvian man 🤚 Gingerbrad man ☝

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rodrigo.siqueira

remix of d/14668 by u/rodrigo.siqueira

function u(t) {

if(t<16){
var r=Math.random,i=X=X0=r()*999,Y=r()*800-400
for(i=1e4;--i;){
X=230+Y-Math.abs(Y=-X)/2
x.fillRect(970+X+Y,450-Y+X,.8,1)
}}

Jun 19 2019 2:54 PM UTC

}// 134/140

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Lozi Map, from the nonlinear dynamics of The Wonderful World of Hamiltonian Maps. #gingerbreadman equation

u/katkip

!
u/Qwitter

Nice SOS, clever golf: X=230+Y-Math.abs(Y=-X)/2

dwitter.net | rodrigo.siqueira (17937)