Top 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/13119 by u/rodrigo.siqueira

function u(t) {

c.width+=X=Y=Z=d=.04
for(i=6e3;i--;)X+=-d*(Y+Z),
Y+=d*(X+.2*Y),
Z+=d*(.2+Z*(X-5)),
x.lineTo(980+80*(X*C(t)-Y*S(t)),800-Z*48+Y*19)
x.stroke()

Jan 12 2020 12:43 AM UTC

}// 140/140

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Turning Rössler Strange Attractor, a system of three non-linear ordinary differential equations with chaotic dynamics and fractal properties. Some people see this turning clockwise, some see counterclockwise due to the bistable optical illusion (search "Spinning Dancer" for explanation). #attractor #illusion

u/rodrigo.siqueira

The rotation effect trick X*C(t)-Y*S(t) was "borrowed" by Frank Force KilledByAPixel's #Lorenz Attractor: from https://www.dwitter.net/d/14752

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rodrigo.siqueira

remix of d/15632 by u/rodrigo.siqueira

function u(t) {

if(t<20)for(i=d=e=f=5e3;i--;x.fillRect(d*z-500,e*z,1,1))[d,e,f]=[(r=Math.random(z=99)*z|3)/5-3/(.2+r%3)*(-30/d)*2,.8*r%15-119*.5/C(d)/d/f,d]

Sep 8 2019 5:01 PM UTC

}// 140/140

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Decomposition of geometric waves

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rodrigo.siqueira

function u(t) {

c.width|=0
for(i=4e3,w=960;i--;x.fillRect(w+w*X/Z,w*Y/Z,s=90/Z/Z,s))
X=C(t/5)*C(V=i+t)*3+C(U=i**6),
Y=C(U+t*2)*T(U+t)-2,
Z=S(V)-4+S(t)

May 17 2019 2:24 PM UTC

}// 134/140

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Swarm around the #torus

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rodrigo.siqueira

remix of d/13644 by u/rodrigo.siqueira

function u(t) {

c.width|=0
for(i=4e3,w=960;i--;x.fillRect(w+w*X/Z,w*Y/Z,s=20/Z/Z,s))X=C(s=i/200)*C(K=i/(10**-(~(t/3)%6))+t/3),Y=C(s)*S(K)-1,Z=S(i)*C(t)/2-2

May 6 2019 1:19 PM UTC

}// 139/140

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Demo of 3D objects #d3

u/iverjo

Nice!
u/iverjo

I like that it alternates between different 3D objects

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rodrigo.siqueira

remix of d/13601 by u/pavel

function u(t) {

c.width|=0
for(i=1e4,X=Y=Z=w=960;i--;x.fillRect(w+w*X/Z,w*Y/Z,s=40/Z/Z,s))a=i**4.8%6,X=X/2+S(a+t/3),Y=(a*S(t)/9)*X+Y/2+1,Z=1.6+Z/2+C(a+t/3)

May 3 2019 2:50 PM UTC

}// 139/140

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Sierpinski particles #sierpinski

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rodrigo.siqueira

remix of d/13592 by u/rodrigo.siqueira

function u(t) {

x.beginPath(x.globalAlpha=.08)
if(t<188.5)for(i=9,j=.1,X=960,k=Y=550;k/=1.4,i--;j*=-6)X+=S(f=t*(j-.2)/3)*k,x.lineTo(X,Y-=C(f)*k);x.stroke()

May 2 2019 6:49 PM UTC

}// 139/140

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Echinoid 7-Symmetry - It needs to run for PI minutes (188.5 seconds) to complete.

u/Jezza

#worththewait
u/DataMeta

That is quite beautiful

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rodrigo.siqueira

remix of d/12959 by u/rodrigo.siqueira

function u(t) {

x.fillRect(0,0,2e3,2e3)
for(var i=4e3;i=i-1;){
X=S(i)+S(K=i*.88)/2+2*S(F=2*i+t)
Y=C(i)+C(K)/2-2*C(F)
x.clearRect(960+X*130,550+Y*130,6,6)
}

Apr 6 2019 2:00 AM UTC

}// 139/140

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The Trefoil Knot. Created using a parametric equation from knot theory.

u/Qwitter

I like how the projected crossings allow you to view the height ambiguously: then, I can see this knot as not being knotted at whim.

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rodrigo.siqueira

function u(t) {

Xp=X=Y=t/800
x.globalAlpha=.1
for(i=2e3;i--;){
X=Xp*Xp-Y*Y+.9*Xp-.6013*Y
Y=2*Xp*Y+2*Xp+.5*Y
Xp=X
x.fillRect(1300+X*820,740+Y*400,2,2)
}

Feb 9 2019 3:14 PM UTC

}// 135/140

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Tinkerbell Map is a chaotic #attractor dynamical system, as described in https://en.wikipedia.org/wiki/Tinkerbell_map

u/rodrigo.siqueira

"Origin of the name: the graphical picture shows a similarity to the movement of Tinker Bell over Cinderella Castle, as shown at the beginning of Disney films."
u/katkip

You can replace Xp with p

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rodrigo.siqueira

function u(t) {

c.width^=0
x.fillRect(0,0,2e3,2e3)
k=t<3?80*t:240
x.fillStyle="#5e9"
for(i=1;i<=k;i=i+.2)x.fillRect(3e3*(i%1)+i*S(i+t)-k,k+i*3*C(i/600),5,9)

Dec 27 2018 3:18 PM UTC

}// 140/140

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Rotating Trees #christmas #tree

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rodrigo.siqueira

function u(t) {

c.width=600;
for(n=1;n<9;n++) {
 for(i=1;i<8;i=i+6.28/n) {
  x.lineTo(S(t)*C(i)*35+370+n*80-450,200+S(i)*80)
 }
 x.stroke()
}

Oct 25 2018 10:00 PM UTC

}// 126/140

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Polygon showcase

u/f8f82804

I love the 2-gon!

dwitter.net | rodrigo.siqueira (18575)