Dweets awesomed by u/Xaviaro

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

Please log in (or register) to post a dweet (copy-paste the code somewhere safe to save it meanwhile)


    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: #Opposites

show FPS hide FPS share fullscreen

ciaccodavide

remix of d/20935 by u/rodrigo.siqueira

function u(t) {

for(f=(X,Y,r,a)=>r>1?f(Y+r*C(a),X+r*S(a),r/3,T(~~t+a/9)*19):x.fillRect(X,Y,r,r),A=t;A<2e4;)f(960,540,360,++A)
t%2>2-.1&&(c.width|=1)

Dec 16 2020 7:43 AM UTC

}// 132/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

New Protein Folding every 2 seconds #organic

show FPS hide FPS share 2 remixes fullscreen

pavel

function u(t) {

with(x)for(fillRect(i=-710,i,i*=-2,i);i--;clearRect(20+9*S(a=i+t),2,w=C(a),w>0))setTransform(16,0,0,16,960,540),rotate(i/226)

Dec 15 2020 11:04 PM UTC

}// 125/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Torus Study #1

u/magna

WOW!
u/vovanmozg

fantastic!

show FPS hide FPS share fullscreen

KilledByAPixel

function u(t) {

c.width|=S=(E,X)=>
x.strokeText(E,40,130+X*150,1850,
x.setLineDash([199-199*C(X-t),99]))
x.font='9em"'
x.lineWidth=9
code.split`
`.map(S)

Sep 1 2020 2:01 AM UTC

}// 137/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Disappearing Reappearing Quine #subliminal #quine

Show more comments…
u/danny@hille.dk

Dyslexia simulator :-)
u/magna

A new technique emerges!
u/KilledByAPixel

Sexlexia, a very sexy learning disability.
u/DataMeta

Dude! :O
u/Xen

Nice!!
u/aaaaaz

no way
u/vain

Holy shit. I need to check and understand the source.

show FPS hide FPS share 4 remixes fullscreen

KilledByAPixel

remix of d/3078 by u/FireFly

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𞀲𞱩𛐭𞱔𚁦👭🐾𮀮𩡩𫁬𤡥𨱴𚁓🰰𞠷𜀫𭀪𝠰𙐱𞐪𞐹𛑘𚡭𛁓🰰𞠸𚱙𚠸𚰨𭀪𜱼𜀩𚠹𞀬𨐽𤰿𜡥𜰺𞀬𨐬𤰽𜀩𚐾𞑼𯁓🱔𚁔👥🐾𣑡𭁨𛡲𨑮𩁯𫐨𚐪𜠵𝐩𚠪𜠯𜡥𜰾𦀪𦀫𚁙𛐵𚐪𚠲𙠦𩠨𞀩𚱦𚀭𞀩𞡸𛡦𪑬𫁓𭁹𫁥👒𚁔𚀩𛁔𚀩𛁔𚀩𚐩𦀽𪐦𝰬𦐽𪐾🠳`.replace(/u../g,'')))

Aug 29 2020 8:05 AM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Color Sprite Generator - reload to randomize

Show more comments…
u/13thptr

wow
u/Xen

love it!
u/tomxor

These are amazing, so many quirky ilttle characters generated.
u/KilledByAPixel

#generative pixelart
u/KilledByAPixel

#pixelart
u/rep_movsd

Smashing!
u/magna

Awesome!
u/aleamb

wow!
u/KilledByAPixel

https://zpritez.3d2k.com/ #fxhash

show FPS hide FPS share 2 remixes fullscreen

pavel

remix of d/9676 by u/f8f82804

function u(t) {

for(i=c.width=480;r=6*S(b=--i/153);S(t)>0&&x.beginPath(x.fill(x.ellipse(240+20*X,135+120*C(b),r*S(t),r,Math.atan(6*C(b)/X),0,7))))X=r*C(++t)

Jun 16 2020 9:02 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Spot the #sphere

u/f8f82804

This is beautiful!
u/Qwitter

Wow!!!!!
u/vain

just great! <3

show FPS hide FPS share 5 remixes fullscreen

pavel

function u(t) {

with(x)for(i=999;i--;fillRect(~setTransform(s=24e3/i,0,0,4*s,960-i+9*s*C(a=i+60*t),540+8*s*S(a)),~rotate(T(a*a)),2,2))fillStyle=R(9,i/4,i/3)

May 4 2020 7:34 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Underwater #cavern

Show more comments…
u/KilledByAPixel

sick
u/KilledByAPixel

looped https://twitter.com/KilledByAPixel/status/12…
u/pavel

One trick here is f();g();h(-1,-1) is the same as h(~f(),~g()) when f and g return a falsy value, undefined in this case.
u/pavel

Notice how none of the distance variables are based on time, only angles are, yet the distances are changing and nothing is rotating...
u/pavel

Try making the moving a little faster :)
u/pavel

After I wrote this I looked for other dweets using a similar technique and this is the earliest one I've found, and it includes an explanation d/10212
u/KilledByAPixel

Amazing work! I have not seen the ~ before, will be using it a lot now. I tried to explain the 60*t trick in one of my blog posts, https://frankforce.com/?p=7160
u/pavel

That is an amazingly detailed explanation with great visual aids.
u/pavel

To clarify your explanation, any integer time works. 60*t is naturally an integer (ish). frame is one char longer without numerical errors. In general, (n*t|0) works for any n.
u/AndrewK

privet
u/katkip

masterpiece
u/joeytwiddle

I think this also counts as a #tunnel
u/Qwitter

Awesome!

show FPS hide FPS share 3 remixes fullscreen

rodrigo.siqueira

remix of d/18458 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>S(S(9*c/d)*t),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))*(d/2+Y),3))x.fillStyle=R(C(r=X*X+Y*Y)*125),d=r>1||T(r)

Apr 23 2020 5:58 PM UTC

}// 139/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Red Sphere Reflection #raytracing (high resoluton)

Show more comments…
u/Xen

Tf Dude! top dweet right here 😍
u/lionleaf

That's amazing!
u/lionleaf

#glass #sphere
u/stiaje

#witchcraft
u/Ath0r

Impressive, great job!
u/katkip

genius script
u/PoweredByWill

wow. dwitter povray.
u/mole

I am shooketh. This is absolutely incredible.
u/katkip

#slowrender
u/cli

This is great.
u/Nascretis

Actually insane. #witchcraft

show FPS hide FPS share fullscreen

pavel

remix of d/13495 by u/pavel

function u(t) {

for(i=t?c.width|=C=_=>u[j=q+n&-n|p/n]=-!u[j]|1:p=q=r=s=571;i--;u[i]||x.fillRect(i?i%n*n:p+=r*=C(p+=r),i?i&-n:q+=s*=C(q+=s),z=i?n:15,-z))n=64

Apr 11 2020 10:31 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

#breakout

Show more comments…
u/pavel

Fixed the tilted look, the missing upper left block, and increased the size of the ball.
u/pavel

Why does changing 571 break the code for most values? :)
u/pavel

472, 582, 593 work well though
u/iznax

The code seems to work with most starting values if you change it to "C=_=>(p|q)<0?-1:u[j=q+n&-n|p/n]=-!u[j]|1" and handle negative coordinates as blockers?
u/KilledByAPixel

👍
u/pavel

Its shorter to init positions and velocities to same number but makes velocities too fast. Another problem is that init needs to happen once and shortest way to do that is t?<spot>:init which creates a spot to do something every non-first frame. I solve both problems by naming my collision detection function C and defining it on every non-first frame. On the first frame C is Math.cos so the velocity update code does r = r*C(p+=r) = 571*Math.cos(571+571) = 17.7 which is a reasonable speed.
u/pavel

The ball needs to be updated once per frame. Since I am iterating with a single index its easiest to check for index 0. This corresponds to the upper left block which is why it was missing in the original. A short fix is to shift everything up one block by using negative height for the blocks and adding a row to ball position encoding. The +n in q+n&-n|p/n.
u/pavel

I encode and decode 2d co-ordinates into one number. The block coordinates are (i%n,i/n|0) and their width is n making their real positions (i%n*n,(i/n|0)*n). Lets simplify the second one. If we choose n=2**k then (i/n|0)*n = (i/2**k|0)*2**k = (i>>k)<<k so we are zeroing out the last k binary digits. But if n=2**k then -n is a bunch of ones followed by k zeroes (https://en.wikipedia.org/wiki/Two%27s_comple…)! Therefore (i/n|0)*n = i&-n.
u/pavel

Need to check if ball pos (p,q) touches a new block. Ball is always in some block, find that blocks pos index. Dividing ball position by n gives the virtual coords and blocks are 1x1 so truncating gives 2d block coordinates (p/n|0,q/n|0). Want to encode this into index j where (x,y)=(j%n,j/n|0). Therefore j=(q/n|0)*n+(p/n|0). If n=2**k then in binary j=[32-k binary digits y-coord][k binary digits of x-coord] so we can use bitwise-or which also auto-truncates so j=(q/n|0)*n|p/n. And as we saw (q/n|0)*n=q&-n so j=q&-n|p/n! Real code uses j=q+n&-n|p/n to add one row to ball pos to account for shift up to hide missing (0,0)` block.
u/pavel

p+=r*=C(p+=r) encodes an unbelievable trick that is perfect for collision detection. For detection we need to independently try advancing vertically and horizontally, check for collision, and reverse course if hit. The temporary state involved in trying can cost a lot of chars. p+=r*=C(p+=r) does it all and C doesn't even read its argument! When C is invoked the global p it sees was already incremented by r. However, the outer p+= will eventually discard that increment. Magic!
u/rep_movsd

Un-effing-believable
u/hvianna

Wow, this is insane!
u/jylikangas

Masterclass in code golfing!
u/13thptr

awesome, looks like the ball escapes without breaking everything after a while though. will read the explanation more thoroughly.
u/pavel

No chars left for bounds checks! It freaks out with negative positions. If I find a way to shorten I will add bounds.
u/ersagun

I need to read and reread that explanation on a loop until I get this. This is incredible.
u/Qwitter

Just wow.

show FPS hide FPS share fullscreen

cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𪀽𝐴𜀬𭰽𨰮𭱩𩁴𪁼🐰𞱩𛐭𞱸𛡢𩑧𪑮𤁡𭁨𚁸𛡳𭁲𫱫𩐨𚐩𚑛𜀬𮀮𫁩𫡥𥱩𩁴𪀽𞑝𛡭𨑰𚁶🐾𮀮𩡩𫁬𤡥𨱴𚁘👷𛰲𚰨𤰨𬀽𪐪𛠳𝐫𭠫𭀯𜠩𚰨𪐯𝐰𯀰𚐪𝀭𜐴𚐯𚁚👃𚁰𚐫𞀩𚡨𛁙👨𚰨𪐥𝐰𚠮𝀭𞐩𛱚𚡨𛁳👷𛱚𛱚𛁳𛁸𛡬𪑮𩑔𫰨𦀫𬰯𜠬𦐫𬰯𜠩𚐩`.replace(/u../g,'')))

Apr 6 2020 4:44 AM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

https://dweet.net/407/18157

u/cantelope

play with the vars at the top -> https://codegolf.dweet.net/a/407

show FPS hide FPS share 1 remix fullscreen

pavel

function u(t) {

for(c.width=i=620;i--;x.lineTo(310*(z+p*S(b))/z,300*(3+q*C(a))/z))q=i/8&1||-1,p=4-q*S(a=S(a=S(b=i/98+2*t)+b)/2+a/2),z=8+p*C(b-=t);x.stroke()

Apr 4 2020 7:12 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

#mobius strip

Show more comments…
u/pavel

Using sin(sin(x)+x)+sin(x)+x as a smooth staircase function to implement the flip as a pulse.
u/KilledByAPixel

👍
u/Xen

love it
u/aleamb

love it!
u/danny@hille.dk

Nice - möbius tape
u/Qwitter

Im sorry, but I find only one side of this to be Awesome.
u/vain

beautiful and smooth transformation / animation

dwitter.net | Xaviaro (5357)