Top dweets of all time

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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KilledByAPixel

function u(t) {

for(i=999;i--;)X=Y=Z=M=N=O=194,Z*=T(i/M),Y*=C(Y/O),M-=(i-X),X*=T(Z+t),N=~(X-i),x.fillStyle=R(M,Y,O,1),x.fillRect(943+X,359+.41*N,.1*Z,.1*Z)

Apr 9 2019 10:50 PM UTC

}// 139/140

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Same auto gen line now (1426 Bad / 114 Good)

u/joeytwiddle

I'm not sure what I see. Cloud City? Anyway I like it!

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vinca

function u(t) {

for(c.width=150,i=11250;i--;)x.fillRect(X=i/75,Y=i%75,1,S((X|Y|t)*t*.1))

Apr 3 2019 12:04 PM UTC

}// 72/140

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u/andrea270872

S and | together... wow. I cannot see what that is as a math function, but the effect is amazing
u/katkip

metal
u/joeytwiddle

#shiny

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Xen

remix of d/12938 by u/username

function u(t) {

for(c.width|=j=69;j--;x.font="2em'")for(i=13;i--;x.fillText(j*i,1e3+r*C(i+j*S(t)),557+r*S(i+j*S(t))))r=17*j

Mar 31 2019 8:43 PM UTC

}// 107/140

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u/username

damn
u/Jezza

Great idea!
u/Jezza

Great idea!

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rnbw

function u(t) {

for(c.width^=i=0;i++<39;x.fill()){x.fillStyle=`hsl(${Math.random()*60},99%,40%,8%)`;x.arc(C(t/4-(i&t*5))*460+960,S(i&t*4)*460+540,0,0,0)}

Mar 29 2019 2:23 PM UTC

}// 137/140

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chthonic 🔥

u/katkip

#glitch
u/DataMeta

I like the choice of coloration
u/DataMeta

Luckily this SCP seems contained

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andrea270872

function u(t) {

c.width|=j=1
for(;j++<15;)for(i=19;i--;x.font=C(t)+6+"em'")x.fillText([...'🏡🌊🌳 '][~~((S((i-~(S(t)*6))*(j+~(C(t)*9))*97)+1)*2)],i*99,j*69)

Mar 20 2019 5:32 PM UTC

}// 137/140

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A map with panning and "zoom"

u/tomxor

oh wow neat! i keep missing these ones cos on chromium linux i get a bunch of tofu - FF is ok though.
u/joeytwiddle

I had a lot of tofu on Ubuntu but then I installed a new Manjaro ;-)
u/tomxor

I'm running minimal a debian, I think it's just missing font packages but can't be bothered to hunt for them. I will try Arch one day when I'm braver :P

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vinca

function u(t) {

c.width|=0,F=(e=>{0!=e&&(x.beginPath(),x.arc(1e3+50*C((t+.1*e)%6.4),500+45*S((t+.13*e)%6.4),9*e,0,6.1),x.stroke(),F(e-2))}),F(130)

Mar 18 2019 3:42 AM UTC

}// 130/140

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yokljo

remix of d/12758 by u/yokljo

function u(t) {

c.width|=0
X=C(t)+16
Y=S(t)+9
x.beginPath()
x.lineWidth=9
for(i=9;i--;)Z=S(Y),Y+=C(X),X+=Z-S(t),x.lineTo(X*60,Y*60)
x.stroke()

Mar 15 2019 10:29 AM UTC

}// 126/140

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rodrigo.siqueira

function u(t) {

c.width|=σ=(X)=>{return 1/(1+Math.pow(Math.E,-X))}
for(i=-500;i<500;i++)
x.fillRect(i+950,820-σ(i/30*C(t*2)+Math.random()*2)*400,5,5)

Mar 4 2019 8:41 PM UTC

}// 133/140

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Sigmoid activation function used in Artificial Neural Networks. Animation shows changes of neural weights plus a random bias.

u/pavel

I often use sigmoids for movement. The ease-out / ease-in looks great. I used 1/(1+1e9**(.5-t%1)) in d/11146 for the 'jumps'.
u/katkip

#sigmoid #math
u/katkip

also #ai
u/rodrigo.siqueira

also #neural

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DataMeta

remix of d/12586 by u/Xen

function u(t) {

for(c.width|=i=135;i--;x.arc(960+C(t*27+i/(t/9+99))*9,540+S(t*9+i/3)*6,i/.9*t%1111,0,x.lineWidth=7))x.beginPath(x.stroke())

Mar 3 2019 1:08 AM UTC

}// 123/140

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resonance

Show more comments…
u/DataMeta

big up to original
u/DataMeta

modify 'i' for different effects
u/sigveseb

#waitforit
u/Xen

Nicely done mate
u/magna

keeps on giving!
u/lionleaf

I was waiting for it pop like a balloon

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pavel

function u(t) {

for(c.width|=p=300;e=p--**.9%1;x.fillRect(960+r(0)/z,200+99/z,s=9*e/z,s))r=d=>p/(1+e*C(a=t/4+p))*C(a+p+d)+2*p/(1/e-e)*C(p+d),z=.5+r(1.6)/800

Feb 28 2019 6:54 AM UTC

}// 140/140

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Galaxy

u/pavel

300 bodies which individually only interact with an infinite mass at the center
u/pavel

Each body moves around an ellipse, the orbits are accurate. However, the movement speed is a very rough approximation.
u/pavel

Naively drawing an ellipse centers it around one of the focal points, however moving a body on this path slows the body down near this focal point and speeds it up near the other one.
u/pavel

The opposite effect is needed. So this code still moves a body around an ellipse but it re-centers the ellipse on the 'other' focal point.
u/pavel

In polar coordinates the difference between the x and y coordinates is a phase shift of pi/2 ~ 1.6