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/15690 by u/pavel

function u(t) {

with(x)for(j=4;j--;fill())for(beginPath(i=8);i-=2;fillStyle=j%2?'#124':'#fff')arc(960,540,2**([1.4,t%=6,2,5][j]*t/2+7),a=(i+t+(j<2))/.955,a)

Sep 15 2019 2:13 PM UTC

}// 140/140

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Star of Pavel

u/katkip

Awesome

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rodrigo.siqueira

remix of d/15667 by u/nystrand

function u(t) {

for(r=945,i=1080;i--;x.fillRect(a+r,b+r-9,20,20))a=t*i*i*r%2e3-r,b=i-r,g=i+S(t)*a/5,x.fillStyle=R(A=C(g/a)*C(t*3-b/g)*i,A+a/8,A+b,.3)

Sep 12 2019 5:13 PM UTC

}// 134/140

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Flight landing

Show more comments…
u/magna

*while on drugs
u/0x04

Wow, trippy 😵
u/KilledByAPixel

👍
u/tomxor

woOp woOp woOp pull up, pull up
u/katkip

Awesome
u/Joachim

That's a very long runway!

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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

remix of d/15630 by u/taupelink

function u(t) {

if(t<5)for(i=d=e=f=5e3;i--;x.fillRect(d*z,e*z,1,1))[d,e,f]=[(r=Math.random(z=99)*z|3)/5-2/(.5+r%3)*C((d-r)*22)*1,.8*r%15-6*S(1/S(d))/f,d]

Sep 6 2019 12:49 PM UTC

}// 137/140

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Geometric gradients

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rodrigo.siqueira

remix of d/12319 by u/rodrigo.siqueira

function u(t) {

c.width|=X=Y=Z=1
for(i=3e3;i--;x.fillRect(500*(t%6.2-i%3-X*C(t*9)/33),800-i%3*90-(1.3+S(t))*Z*6,5,5))Z+=(X*Y-Z)/39,X+=(Y-X)/9,Y+=X*(27-Z)/97

Sep 2 2019 2:05 PM UTC

}// 140/140

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Three Lorenz Butterflies #lorenz #attractor #butterfly

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rodrigo.siqueira

remix of d/15559 by u/tomxor

function u(t) {

for(c.width=128,i=576;i-=1/16;x.fillRect(16*X,16*Y,Z,Z))
x.fillStyle=R(0,35,90),X=i%8,Y=i/128,
Z=1+C(20*T(Y+T(X*2))*C(X+T(Y*9))+t*4)**3/3

Aug 31 2019 12:58 AM UTC

}// 137/140

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Sea from above. #water

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u/jellyedwards

Amazing!
u/aleamb

YES!
u/aleamb

#realisti
u/aleamb

#realistic
u/tomxor

nice, sometimes the unfloored i/128 works in our favour, adds that overall gradient that makes it look like reflecting sky
u/katkip

nice
u/katkip

#tagfail
u/iverjo

Very nice water

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rodrigo.siqueira

remix of d/15559 by u/tomxor

function u(t) {

for(c.width=128,i=576;i-=1/16;x.fillRect(16*X,16*Y,Z,Z))X=i%8,Y=i/128,x.fillStyle=R(i,i/3),Z=1+C(5*S(X+C(Y+X)*C(t)-t))**3/3

Aug 28 2019 11:38 PM UTC

}// 123/140

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Burning flames

u/aleamb

amazing!
u/KilledByAPixel

👍

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rodrigo.siqueira

remix of d/15526 by u/mildlybean

function u(t) {

Z=_=>S((Y*Y+X*X)*S(t))
for(c.width=i=1024;i-=1/8;x.fillRect(48*(X*2+Y*C(t)+11),48*(S(t)*X/2-Y*S(t)+z),1,5))z=6-Z(X=i%8-4,Y=i/128-4)

Aug 26 2019 11:18 PM UTC

}// 131/140

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Rotating sombrero. Remix from @tomxor https://www.dwitter.net/d/15530 , faster, smaller. Now the surface also rotates.

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rodrigo.siqueira

remix of d/15526 by u/mildlybean

function u(t) {

Z=(X,Y)=>S((Y*Y+X*X)/299+t*9)*9
c.width|=0;for(i=-80;++i<80;)for(j=-50;++j<50;x.fillRect(960+i*d+j,540-(j+h)*d,3,3))d=3e3/(410+(h=Z(i,j)))

Aug 26 2019 8:25 PM UTC

}// 138/140

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Sombrero function. Added +j (in fillRect x coordinate) to add perspective. Changed -64/+64 ("for i" and "for j") to other intervals so it can fit the image better and also removed .7* multiplications to get more space for equation.

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rodrigo.siqueira

function u(t) {

η=.1
ℵ=1/t
for(X=-3;X<3;X+=.01){
y=X**3-X*2
ℵ=ℵ-η*(ℵ**3-2*ℵ)
x.fillRect(940+X*400,-y*100+500,5,5)
}
x.fillRect(910+ℵ*400,470,60,60)
throw(ℵ)

Aug 21 2019 1:45 PM UTC

}// 140/140

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Gradient Descent (iterative) algorithm used to calculate sqrt(2). The big dots are the two roots -sqrt(2) and +sqrt(2) of equation Y=X**3-X*2. The Gradient Descent is an optimization algorithm for finding a local minimum of a function near a starting point, taking successive steps in the direction of the negative of the gradient. x[n+1]=x[n]−η(∇f)xn where η is the "Learning Rate". Gradient Descent is widely used for training Machine Learning models. #neural #ai

u/rodrigo.siqueira

Simple version that calculates sqrt(2). If you change initial "x" to -1, it will converge to -sqrt(2), that is the other root of the equation Y=X**3-X*2. Code: x = 1; learning_rate = .1; for(i=0;i<50;i++) { x = x - learning_rate * (x**3 - 2*x) } throw(x);

dwitter.net | rodrigo.siqueira (17937)