Dweets awesomed by u/MAxSaL

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: #Opposites

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KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𜐳𞰭𛑩𞱸𛡦𪑬𫁒𩑣𭀨𬐿𜀺𝀰𜀫𪐪𞐹𚱓𚁴𚐪𜰰𜀬𬐿𜀺𝀴𜀫𤰨𭀯𜠩𚠳𜀰𛁱🰲𩐳𞠵𜀬𬐿𜡥𜰺𜠰𜀩𚑱👩🠹𛁸𛡧𫁯𨡡𫁃𫱭𬁯𬱩𭁥𣱰𩑲𨑴𪑯𫠽𘑱𚱩𙐲🰧𫁩𩱨𭁥𬠧𞠧𩁩𩡦𩑲𩑮𨱥𙰬𮀮𩡩𫁬𤱴𮑬𩐽𪐥𜠪𬐿𙰣𜀱𜀱𜀱𙰺𙰣𡡆𡠧`.replace(/u../g,'')))

Apr 14 2020 3:03 PM UTC

}// 134/140

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Clean Long Trails #Default - demo of technique to fully fade off trails

u/sigveseb

Nice! Looks clean. What's the technique though? So hard to read compressed code on mobile!
u/KilledByAPixel

use difference with white to invert, then lighter with dark grey to make trails, then difference with white again to invert back
u/KilledByAPixel

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

Ah I had somethign similar-looking: d/11469

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BriSeven

function u(t) {

eval(unescape(escape`挮睩摴桼㵮㴶㐻景爨樽渻樭ⴻ⥦潲⡩㵮㭩ⴭ㭸⹦楬汒散琨ⴲ㔬㠰⭃⡡⨴⵴⨴〩⨳〭䌨㌪樯渫㤩⨵〬㈰ⰲ〩⥸⹦楬汓瑹汥㵒⠲㔵⵪⨳ⱪ⤬砮獥瑔牡湳景牭⡃⡡㴶⸲㠪椯渫琩⨲ⱓ⡡⤬ⵓ⡡⤪㈬䌨愩ⰹ㔰ⰵ〰⭪⨷⤠`.replace(/u(..)/g,"$1%")))

Apr 14 2020 11:28 AM UTC

}// 139/140

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A tasty bella pepper.

u/sigveseb

Mmm makes me hungry
u/BriSeven

Ages ago I had a super long dweet that I couldn't post, that was something like 3d lighted aliens made from randomized particles. The trickiest thing about them was the z-sorting. But, you kinda get that for free if you carefully draw in layers along the axis you're rotating on. Painter's algorithm in essence, but the data is structured so you don't have to run a sort.
u/BriSeven

one of these days I'll understand the BSP algorithm

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rep_movsd

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁺👌👴𛰲𛁦𪑬𫁒𩑣𭀨𩡩𫁬𤱴𮑬𩐽𜀬𜀬𨰮𭱩𩁴𪀽𜐹𜠰𛀱𜀸𜀩𛁩🐵𞱩𛐭𞱌𚰽𝐩𩡯𬠨𬠽𦠽𜠵𝐬𪰽𜀻𬠭🐮𝐻𪰫🐱𛠵𚑦𪑬𫁓𭁹𫁥👒𚁃𚁴𚐪𦠬𦠬𬠬𛠱𚐬𩡩𫁬𤡥𨱴𚀹𝠰𚰨𪰫𮠩𚡓𚁍👌𚱲𛰷𝐩𛀵𜀰𚱃𚁍𚐪𪰯𜠫𮠬𬠯𝀬𬠯𝀩𛁺👺𚠷𙐳𞐻`.replace(/u../g,'')))

Apr 12 2020 9:46 PM UTC

}// 140/140

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Spiral Galaxy

u/rep_movsd

#space #galaxy

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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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rodrigo.siqueira

remix of d/17637 by u/rodrigo.siqueira

function u(t) {

c.style='filter:invert('
for(A=a=b=0,i=1e4*(t<4);i--;)a+=2*(S(t*i**7)<0)-a/3+b*S(a),b+=C(A)/2+.3-S(b/3),A=a,x.fillRect(a*440-400,b*990,.4,1)

Apr 10 2020 9:22 PM UTC

}// 140/140

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Ethereal Figures #art

u/KilledByAPixel

👍
u/rep_movsd

#underrated

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tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𜐸𜀻𨰮𬱴𮑬𩐽𙱦𪑬𭁥𬠺𨡬𭑲𚀱𬁸𚑩𫡶𩑲𭀨𙰻𩡯𬠨𭀯🐱𜠬𪐽𜱥𜰻𫐽𪐦𜐬𭠽𜐶𛑭𚠲𛁰🐵𚠨𪐥𝀸🀱𞀩𛁩𛐭𞰩𮀮𩡩𫁬𤡥𨱴𚁭𚠵𜀫𞀰𚱰𚡓𚁐👩𚠪𛠷𚱴𚐫𭠪𠰨𥠽𪐪𚠮𝐫𭀭𭀪𫐪𜐮𝐩𛁭𚠲𜀫𝀰𚱰𚡃𚁐𚐫𭠪𤰨𥠩𚡃𚀡𬀪𪐩𛀱𛀮𝰭𫐪𛠵𚐻`.replace(/u../g,'')))

Mar 15 2020 12:14 AM UTC

}// 140/140

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The Enemy

Show more comments…
u/tomxor

#coronavirus
u/sigveseb

Incredible!
u/katkip

This is extremely #realistic. I'm scared.
u/joeytwiddle

Good render! #virus #organic Here is a great 1 hour documentary about viruses: https://www.dailymotion.com/video/x6agslv
u/aleamb

amazing! fucking amazing!
u/DataMeta

wow, fantastic!
u/KilledByAPixel

😷 Even Dwitter is not safe!
u/Odog8

how though???
u/lionleaf

Insane!
u/lionleaf

I didn't even notice that it was animated at first :O
u/Cloud

#koronavirus
u/vain

What? How does this work? I am speechless... (incredible animated corona/cell)

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rodrigo.siqueira

remix of d/15411 by u/rodrigo.siqueira

function u(t) {

c.width|=v=(a,b,Φ,r)=>{for(i=~r;i++;)x.fillRect(a-=S(Φ),b-=C(Φ),s=r/9,s)
r>15&&v(a,b,Φ-S(t),r*=.5)&v(a,b,Φ+C(r-t),r*=1.6)}
v(940,1e3,0,230)

Feb 29 2020 3:38 PM UTC

}// 139/140

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Dancing branches #organic #tree #growth

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sigveseb

function u(t) {

eval(unescape(escape`圽琥㌼⸲㼶㐫匨䌨琪㤩⤪㤺圻景爨椽㈵㘻椭ⴻ砮晩汬剥捴⡩⨸ⰰⰸⰸ⤩砮晩汬却祬攽椼⠱㈸ⵗⵔ⡍㵴⼲┱⸵⤩籼椾吨䴩⬶㐫圿∣㑡攢㩠桳氨〬〥Ⱔ答⡴⨳⤫⡍㸮〵⤪㈵⨨ㄫ⡩㸶㐫圯㌩⥽┩总砮摲慷䥭慧攨挬〬㐩`.replace(/u(..)/g,"$1%")))

Jan 13 2020 12:46 AM UTC

}// 140/140

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Infinite #castle tower

u/sigveseb

#compressed
u/KilledByAPixel

👍
u/sigveseb

I really wanted to add some windows as well, but couldn't fit it in
u/denzen

I love it!
u/astronaut

Impressive. Like almost all your posts.

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sigveseb

function u(t) {

with(x)x.f=fillText,drawImage(c,S(t*(M=999))*(N=250),-N),font=N+'em '+f(font='50em 🧙‍♂️',-2*M,650),font=N+'pt '+f('🚪',-M,4200),f('⚗️ 🔮',M,M)

Jan 12 2020 1:31 PM UTC

}// 140/140

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The #castle wizard

u/sigveseb

(No idea what kind of magic he is using)

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username

remix of d/7630 by u/jylikangas

function u(t) {

c.width=200
for(i=2;i--;x.lineTo(X+3,Y>71?Y:71))Y=S(t*3+i*3.14)*60,x[f='fillRect'](X=50+i*99,Y=Y>9?89:80+Y,6,-9)
x.stroke()
x[f](98,80,9,20)

Nov 6 2019 6:49 PM UTC

}// 140/140

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BOUNCE

u/username

#randomremix no 36
u/katkip

#physics #collision #balance

dwitter.net | MAxSaL (8444)