Dweets awesomed by u/rodrigo.siqueira

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

remix of d/18241 by u/KilledByAPixel

function u(t) {

for(j=99;j--;S=540)for(q=X=j%2?X:A=T(B=T(T=Math.random)*2-1)*3-2,Y=B,i=S;q*X*i--;j%2&&x.fillRect(850-S*X,Y*S+S,.5,1))X=X*X-Y*Y+(Y=2*X*Y+B,A)

Apr 14 2020 5:20 AM UTC

}// 140/140

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Filtered Anti-Buddhabrot #Fractal - Only trapped orbits

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rodrigo.siqueira

remix of d/17524 by u/DaSpider

function u(t) {

c.width|=w=n=44
for(e=[i=w*w];i--;S=9)for(;S--;n+=T[i%w+i+S*w]|0,e[i]=n%3,x.fillRect(i%w*w,i,w*T[i],w));T=e

Apr 12 2020 9:59 PM UTC

}// 107/140

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Primordial soup #gameoflife (with changed rules to fit 107 bytes). Homage to John Conway (1937-2020), the creator of Game of Life and cellular automata, seed of ideas for Artificial Life, emergence, self-organization and complexity.

u/tomxor

Farewell John Conway, not his favorite discovery, none the less responsible for generations of programmers enjoyment.

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KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𜑥𜰬𦠽𝐴𜀻𛐭𪐻𮀮𩡩𫁬𤡥𨱴𚁴🰸𜀰𛐨𠰽𠰪𛐭𥀿𠰪𠰭𤰪𤰫𚁓🐲𚡃𚡓𚱂𛁁𚐺𠐽𬠨𤰽𠠽𬠨𥀽𜑥𜰩𚠴𛐲𚐪𝠭𜰩𚡚𞠰𛁴🱓𚡚𚱚𞠰𛁷👴🰨𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱚𚠨𠐪𠐫𠠪𠠩𚠪𛠵𯐬𞐹𙐬𙁻𞐹𛑔𛰱𜱽𙐬𛠵𨀬𜐩𞠲𩐳𛁷𚐩𬠽𣑡𭁨𛡲𨑮𩁯𫐻`.replace(/u../g,'')))

Apr 12 2020 6:13 PM UTC

}// 140/140

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Anti-Buddhabrot 3.0 #Fractal

u/rodrigo.siqueira

Very beautiful colors! Slow but wonderful result. #mandelbrot #art #waitforit #SlowDraw
u/KilledByAPixel

thanks rodrigo ✌️
u/KilledByAPixel

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

#buddhabrot
u/magna

This is so pretty!

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KilledByAPixel

remix of d/18243 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪠽𝀸𛁺🐵𝀰𞱪𛐭𞰩𩡯𬠨𪐽𜡥𜰬𠐽𥀨𠠽𥀨𥀽𣑡𭁨𛡲𨑮𩁯𫐩𚠴𛐲𚐪𜰭𜠬𦀽𠐬𦐽𠠻𦀪𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚁴🰸𜀰𛑘𚡺𞠰𛁴🱙𚡺𚰵𝀰𞠰𛁗👴🰨𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱩𛰳𯐬𞐹𙐬𙁻𞐹𛑩𛰳𞑽𙐬𜑠𛀱𚐺𜡥𜰬𥰩𚑘👘𚡘𛑙𚡙𚰨𦐽𜠪𦀪𦐫𠠬𠐩`.replace(/u../g,'')))

Apr 12 2020 6:34 AM UTC

}// 139/140

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Mandlebrot Nebula 2.0

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KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪠽𮠽𝀵𜀻𪠭𛐻𪀽𪐩𩡯𬠨𪐽𮠬𬐽𪠥𜠿𠐽𥀨𠠽𥀨𥀽𣑡𭁨𛡲𨑮𩁯𫐩𚠴𛐲𚐪𜰭𜠺𦀬𦀽𠐬𦐽𠠻𦀪𪐭𛐻𬑼𯁸𛡦𪑬𫁒𩑣𭀨𭀿𦐪𮠫𞐶𜀺𜀬𭀿𦀪𮠫𝰴𜀺𜀬𥰽𭀿𚁸𛡦𪑬𫁓𭁹𫁥👠𪁳𫀨𙁻𪀯𜡽𛀹𞐥𛀵𜀥𛀮𜡠𛀱𚐺𜡥𜰬𥰩𚑘👘𚡘𛑙𚡙𚰨𦐽𜠪𦀪𦐫𠠬𠐩`.replace(/u../g,'')))

Apr 12 2020 6:10 AM UTC

}// 140/140

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Color Buddhabrot 2.0 #SlowDraw #Fractal

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KilledByAPixel

function u(t) {

for(j=98;j--;S=1e3)for(q=j%2?A=T(B=T(T=Math.random)*4-2)*3-2:X,X=A,Y=B;X*S--;q||x.fillRect(Y*450+960,X*450+740,.5,1))X=X*X-Y*Y+(Y=2*X*Y+B,A)

Apr 12 2020 5:38 AM UTC

}// 140/140

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Buddhabrot #Fractal

u/KilledByAPixel

This one takes a while. #slowdraw
u/KilledByAPixel

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

#buddhabrot

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KilledByAPixel

remix of d/18218 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𞐻𪐭𛐻𨐮𫑡𬀨𫰽🡻𭱩𭁨𚁯𚑘𙠦𮀮𨱬𩑡𬡒𩑣𭀨𚁘👘𚡘𛑙𚡙𚰨𦐽𜠪𦐪𦀫𠠬𠐩𚐪𝐴𜀫𜐲𜀰𛁙𚠵𝀰𚰵𝀰𛀵𛀵𚑽𚐩𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛀲𩐳𛀲𩐳𚐬𭀿𨐮𬁵𬱨𚁻𦀺𠐽𥀨𥀽𣑡𭁨𛡲𨑮𩁯𫐩𚠴𛐲𛁙𞡂👔𚁸𛡧𫁯𨡡𫁁𫁰𪁡🐮𜀳𚐪𜰭𜠬𠐬𠡽𚐺𨐽𦱝`.replace(/u../g,'')))

Apr 12 2020 5:10 AM UTC

}// 140/140

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Capturing Mandelbrot Orbits

u/rep_movsd

These are attracting me strangely :p
u/KilledByAPixel

#buddhabrot #fractal

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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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KilledByAPixel

function u(t) {

for(j=z=(q=540)*2;j--;)for(X=A=j/q-1,Y=B=t/9-1.5,i=39;X<z&&i--;)Y=Y*Y-X*X+(X=2*Y*X+A,B),x.globalAlpha=.05,x.fillRect(X*q+960,Y*450+700,1,1)

Apr 9 2020 11:52 PM UTC

}// 139/140

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Anti-Buddhabrot Linear Draw Method #SlowDraw #Fractal #Mandelbrot

u/KilledByAPixel

this one draws quick relatively speaking https://twitter.com/KilledByAPixel/status/12…
u/KilledByAPixel

#buddhabrot

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