Dweets awesomed by u/trusktr

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.

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Current theme challenge: #Opposites

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rodrigo.siqueira

remix of d/18323 by u/pavel

function u(t) {

for(i=2e3,f=(X,Y,n=89)=>X<9?f(X*X-Y*Y-.8,2*X*Y+.2,n+2):x.fillStyle=`hsl(${n*2} 90%${n/2}%`;i--;x.fillRect(i,t*90,1,900))f(i/490-2,1-t/6)

Apr 19 2020 9:13 PM UTC

}// 136/140

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Color #Julia Set #fractal purple blue rays

u/pavel

Broken on Safari because of the missing space in the hsl
u/katkip

satisfying to watch
u/rodrigo.siqueira

Here is a version (with other colors) working on Safari: https://www.dwitter.net/d/18352

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KilledByAPixel

function u(t) {

eval(unescape(escape`𫱮𫑯𭑳𩑭𫱶𩐽𩐽🡡𛡰𭑳𪀨𮱘𞡁👥𛡸𛰲𝐷𛐱𛠵𝀬𦐺𠠽𩐮𮐯𜐴𝐭𜐮𜐬𠐬𠡽𚐊𮀮𩡩𫁬𤡥𨱴𚁴🱸𛡧𫁯𨡡𫁁𫁰𪁡🐮𜀵𞡡👛𧐬𜀬𜡥𜰬𜡥𜰩𒡡𛡭𨑰𚁯🐾𮱷𪑴𪀨𫰩𮀮𨱬𩑡𬡒𩑣𭀨𦀪𞀷𜠫𜐳𝀴𛁙𚠴𞐱𚰵𝀰𛀵𛀵𛁘👘𚡘𛑙𚡙𚰨𦐽𜠪𦐪𦀫𠠬𠐩𚑽𚐻`.replace(/u../g,'')))

Apr 13 2020 12:26 AM UTC

}// 138/140

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Mandelbrot Orbit Explorer 2.0 #Interactive

u/KilledByAPixel

Enhanced version: https://codepen.io/KilledByAPixel/pen/GRpJEzO
u/KilledByAPixel

#buddhabrot #fractal
u/iverjo

#witchcraft

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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

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#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.

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KilledByAPixel

remix of d/18191 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𪑦𚀡𭀩𮱦𫱲𚁩🐶𜠬𠐽𦱝𞱩𛐭𞰩𪐥𜐶𛐱𜐦𙡩𙐱𝠼𜐴🱁𛡳𬁬𪑣𩐨𚁁𛡬𩑮𩱴𪀫𜐩𚡍𨑴𪀮𬡡𫡤𫱭𚁯𫡣𫁩𨱫👱👱🐾𮀮𩡩𫁬𥁥𮁴𚁓𭁲𪑮𩰮𩡲𫱭𠱯𩁥𤁯𪑮𭀨𝐵𜰵𝠬𝐶𝀸𜐫𠑛𚰫𪑝𚐬𪐥𞀪𜠴𜀬𜰰𝠫𚁩🠾𜰩𚠳𝠴𚐩𛀰𛁩𚐺𮀮𩡯𫡴🐧𜠳𩑭𘠧𞱱𚁱𚀩𚑽`.replace(/u../g,'')))

Apr 10 2020 5:03 AM UTC

}// 140/140

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Blackjack 🂫🂡 Click for another card! #Interactive #Cards

u/KilledByAPixel

No actual game logic, we are on the honor system here ;)
u/BriSeven

Yahtzee!

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KilledByAPixel

function u(t) {

c.style.filter='sepia()invert('
r=Math.random
A=X=r()*4-2
B=Y=r()*2-1
for(q=i=540;i--;x.fillRect(X*q+1200,Y*q+q,1,1))X=X*X-Y*Y+(Y=2*Y*X+B,A)

Apr 9 2020 4:39 AM UTC

}// 140/140

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Mandelbrot Galaxy #Fractal #SlowDraw

Show more comments…
u/KilledByAPixel

GIF: https://twitter.com/KilledByAPixel/status/12…
u/KilledByAPixel

#Mandelbrot #WaitForIt
u/joeytwiddle

Very pretty! Mandelbrot in space
u/iverjo

Impressive
u/tomxor

Incredible!
u/aleamb

beautiful!!
u/Xen

sexy!
u/DataMeta

coool!
u/KilledByAPixel

thank you 😊
u/KilledByAPixel

#buddhabrot
u/Qwitter

Nice to see

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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

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#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

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Kirjava

function u(t) {

eval(unescape(escape`𭁼𯀨𬰽𦰮𛠮𘠠𜐳𡁜𫡆𞀲𠱜𫡅𠐵𝁜𫠶𞑂𝰢𧐬𥀽𜀩𛁯𫡫𩑹𭑰👮🐾𚁑👳𦱶👔𚱛𛐱𛀵𛀱𛀭𝑝𦰳𙡮𛡷𪁩𨱨𧑝𚐾𘠰𘠿𬱛𬱛𥁝👑𛁔👶𧐽𘠠𘠺𜀬𩀽𩁯𨱵𫑥𫡴𛡢𫱤𮐬𩀮𪑮𫡥𬡈𥁍𣀽𘠼𬁲𩐾𘠫𬰮𪡯𪑮𨁠𛁤𛡳𭁹𫁥𛡦𫱮𭁓𪑺𩐽𙰵𩑭𙰻`.replace(/u../g,'')))

Apr 2 2020 9:23 AM UTC

}// 132/140

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15 puzzle #game #interactive

u/Kirjava

control with IJKL
u/katkip

Works on light theme

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gpolonus

remix of d/17924 by u/gpolonus

function u(t) {

t?0:d=[]
f=n=>Math.floor(n*.056)
r=s=>x[s](i*60,j*60,60,60)
onclick=e=>{i=f(e.x);j=f(e.y);d[i/j]=d[i/j]?r('clearRect')||0:r('fillRect')||1}

Mar 12 2020 4:56 PM UTC

}// 139/140

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Click for Squares! #interactive

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gpolonus

function u(t) {

t?0:b=17.3
onmousemove=e=>b=e.x/15
f=(a,y)=>(x.fillStyle=a%2?'#dee':'#abb',x.fillRect(a,y,9,9))
for(i=0;i++<2e3;)f(i,S(t+i/100*b)*540+540)

Mar 12 2020 2:04 AM UTC

}// 138/140

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Interactive argyle #interactive

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gpolonus

function u(t) {

onmousemove=e=>{c.width|=0;for(i=0;i<3e3;i+=50)for(j=0;j<2e3;j+=50){v=e.y*3-j;d=e.x*3.4-i;p=2e-3*(d*d+v*v)**.5;x.fillRect(i+d*p,j+v*p,9,9)}}

Mar 10 2020 7:57 PM UTC

}// 140/140

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Weird ball thing. Move the mouse to start #interactive

u/gpolonus

Tried to get a fabric of squares to gravitate towards the mouse, and got this instead. Adding +1 to the calculation of p gets close to what I wanted, but this looked cooler.

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