Dweets awesomed by u/elochimsiemasz

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: #ScaryMovies

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pavel

function u(t) {

for(c.width=i=640,n=32,q=2*t%1*n|0;i--;x[X>7&X<12&[810,865,1858,9808][q>>3]>>i/8+X+6?'fillRect':'strokeRect'](X*n-q,(i&-n)-q,n,n))X=i%n

Apr 16 2020 7:25 PM UTC

}// 135/140

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Keep Gliding Mr Conway

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u/pavel

#gameoflife #glider
u/pavel

https://www.reddit.com/r/perfectloops/commen…
u/Xen

love it!
u/joeytwiddle

#tribute
u/rodrigo.siqueira

Wow! I've been using this Glider image (also known as HACKER EMBLEM) for years as my computer wallpaper, here is full hd version of my wallpaper: https://in.bot/agi/Hackers-emblem-Carbon-Gli…
u/Qwitter

Life was definitely a gateway drug for me as well.

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KilledByAPixel

remix of d/18279 by u/KilledByAPixel

function u(t) {

for(i=s=540;i;S||x.fillRect(s-A*s,B*s+s,1,2,x.fillStyle=`hsl(${T*T} 99%50%`))S=S*T--?S*S-C*C+(C=2*S*C+B,A):(C=B=--i/270-1,T=29,A=t/9-2)

Apr 16 2020 4:13 AM UTC

}// 135/140

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Mandlebrot Set 2.0 🌈 #SlowDraw #Fractal #Mandelbrot

u/KilledByAPixel

with improved draw speed and colors!
u/KilledByAPixel

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

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rodrigo.siqueira

remix of d/18197 by u/KilledByAPixel

function u(t) {

c.style.filter=`sepia()invert(`
for(Y=X=j=1e4;j--;j%99||(T=Y=S(j)*2,R=X=C(t*j)))Y=Y*Y-X*X+(X=2*X*Y+R,T),x.fillRect(X*450+960,Y*450+700,.5,1)

Apr 15 2020 8:05 PM UTC

}// 140/140

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Lines of #Buddhabrot #mandelbrot #fractal

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rodrigo.siqueira

remix of d/18262 by u/KilledByAPixel

function u(t) {

c.style.filter=`sepia()invert(`
for(P=j=2e4;j--;j%99||(T=P=S(t+j)*2,R=C=T*2))
P=P*P-C*C+(C=2*C*P+R,T),x.fillRect(C*450+960,P*450+700,1,1)

Apr 15 2020 12:59 AM UTC

}// 137/140

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Particle collision inside a hadron collider #particles

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doughno

function u(t) {

w=1920
h=1080
for(i=0;i<16;i++){
x.fillStyle=i%2?"#000":"#FFF"
s=(350+i*40)*C(t*1.5)-i*100
a=s+600
if(a>0)
x.fillRect((w-a)/2,(h-a)/2,a,a)
}

Apr 15 2020 12:54 AM UTC

}// 140/140

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u/sigveseb

Sweet
u/Xen

nice!

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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`𭀾𛠲𯁼𚁣𛡳𭁹𫁥𛡦𪑬𭁥𬠽𙱢𫁵𬠨𜑶𪀩𪑮𭡥𬡴𚀱𚐧𛁁👷🐱𞐲𜀬𠠽𪀽𜐰𞀰𚐊𩡯𬠨𨰮𭱩𩁴𪀽𭰬𦀽𠐬𦐽𠠬𪐽𭰪𝀻𪐭𛐻𚑸𛡦𪑬𫁓𭁹𫁥👒𚁩𛰴𝐬𜐵𜀬𪐥𞐩𛁸𛡦𪑬𫁒𩑣𭀨𦀽𚁘𜐽𦀫𠰨𦐩𚠲𝐩𙑷𛁙🐨𦐱👙𚱓𚁘𚐪𝰩𙑨𛀱𞐬𞐩𛁩🐽𭰪𜰦𙠨𠐽𦀬𠠽𦐩`.replace(/u../g,'')))

Apr 13 2020 1:26 PM UTC

}// 140/140

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Thunderstorm

u/sigveseb

Cool!
u/rep_movsd

#storm

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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

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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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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

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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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KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛁺🐱𩐴𛁺𚐬𪐽𜠰𞱩𛐭𞰩𩡯𬠨𪠽𬠽𚁩𚠱𞐭𪐪𪐫𞐩𚠪𛠵𚠴𯀰𞱪𛐭𞱸𛡦𪑬𫁒𩑣𭀨𞐶𜀫𚁪🡲𛰲🱔🐹𞐺𜐲𚐪𬠪𠰨𨐪🐶𛱲𚐬𪐪𝐰𛁔𚡓𚁡𚐬𝐰𚐩𮀮𩡩𫁬𤱴𮑬𩐽𤠨𭠽𪐿𜐴𜀭𠰨𤰨𪐩𚡔𚠨𚁡👪𚱴𙐱𚐯𮠫𥀩𚠪𜠩𚡔𞠰𛁶𚡩𛰹𛁶𚐻`.replace(/u../g,'')))

Apr 1 2020 3:25 PM UTC

}// 140/140

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#Disco #Dancing

u/tomxor

nooice
u/sigveseb

Oh damn this looks great

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