Dweets awesomed by u/Ath0r

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

remix of d/24056 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󩭯󬬨󪼽󨼮󭽩󩍴󪍼󟝪󟜲󝜻󦌽󪬭󛜯󝌱󞼩󩭯󬬨󪜽󤬽󪬪󚬵󙜳󞜹󚼲󞜹󞽷󟝩󛜭󛼴󞽸󛭦󪝬󫍒󩝣󭌨󦌪󜽥󜼭󤬪󥌥󭼫󘝺󚭓󚍴󚬳󚽩󛼹󚜪󜬹󛍔󟜷󜬰󚼨󪜭󤬩󛼨󮬿󜜺󛜲󚜬󭼬󜬩󚝺󟝩󙬷󒭦󫽲󚌻󛜭󪼻󚝸󛭣󫍥󨝲󤭥󨽴󚍫󚽓󚍴󚬹󚽫󚜪󞜬󚍴󚬹󞜫󪼪󪼩󙜱󩜳󛍺󟝫󙜹󛍺󚜻`.replace(/u../g,'')))

Jan 1 2023 6:16 PM UTC

}// 138/140

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Seasons Dweetings 🌲❄️

u/Nemecsek

Wonderful! This is genius.
u/KilledByAPixel

thank you :)
u/4ce

Ok. This Demo in top, therefore i will say here. Happy⠀winter⠀holidays⠀everyone! goodLuck⠀~_^⠀!
u/joeytwiddle

#christmas #snow #water #trees #scene
u/lonestar108

how

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tomxor

remix of d/25759 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𠐽𠠽𥐽𥠽𜀻𪐭𛐻𥀽𤰨𜠪𭀫𜠪𣑡𭁨𛡡𭁡𫠲𚁃𚁘𛰸𚐬𤰨𭀫𦐯𞀩𚐩🠰𚑸𛡦𪑬𫁒𩑣𭀨𦀽𪐥𭰬𦐽𪐯𭰬𜐬𥁼𤠼𜀩𛁡👘𛑁𛁢👙𛑂𛁒👡𚡡𚱢𚡢𛐲𝐬𥀦𤠼𜐦𙠨𥐭👡𛁖𛐽𨠩𞱁𚰽𥐯𝀸𚱷𛁁𙐽𭰬𠠫👖𛰲𝀫𭰬𠠥👷𛁖𚰽𞀭𥠯𞀻`.replace(/u../g,'')))

Oct 10 2022 2:14 PM UTC

}// 140/140

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Infinite Falling Marble #Physics

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u/tomxor

This sh**'s chess, it ain't checkers
u/magna

Crazy!
u/vain

Holy sh*t... 😮 that's incredibly impressive! 👍 Really enjoying watching it. Great work!
u/lonestar108

blows my mind every time
u/neimad

wizardry
u/mrperson59

Delete the last 4 chars in the compressed string and watch the ball wobble around like mad
u/tomxor

Yeah -V/8 is for velocity damping on Y. Which is necessary with velocity based collision resolution. An alternative that doesn't require this is verlet integration, but that requires far more characters.
u/Qwitter

Cool
u/nix

r u effin kiddin me?

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solendil

function u(t) {

r=`7213457’s416561his4.`
for(i in r)`t32# because # was a Catholic#her# mo0#, and #3 fa0#Nory`.split`#`.map((t,i)=>r=r.replace(i,t))
throw r

Oct 20 2020 2:00 PM UTC

}// 140/140

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..or had been. -- Nicholson Baker, The Everlasting Story of Nory

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yonatan

remix of d/10191 by u/yonatan

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪀽𞐹𛁩🐲𩐳𞱩𛐭𞱾𚁱𯁙𚐦𝀦𙠱🀼𚁙🀼𜡼𬐪𜠩𙠳𝐹𝁼𯁸𛡦𪑬𫁒𩑣𭀨𝐰𚱃𚁭𚐪𬠬𭐪𜠲𛑓𚁭𚐪𬠯𜰬𝠬𝐩𚑡👩𛰱𞀬𬠽𚀹𚱃𚁩𚐩𚠶𚡓𚁓𚁵🐳𛑩𛰶𝠶𚐪𚠮𝐩𛁸𛡦𪑬𫁓𭁹𫁥👒𚁧👃𚁴𚐪𤰨𫐽𭀪𜠫𨐩𚠳𝰷𛁧𛰲𚐬𦐽𭐪𜰭𝀬𬐽𨐥𝠮𜰊`.replace(/u../g,'')))

Oct 13 2020 7:23 PM UTC

}// 139/140

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on/off #pumpkin

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KilledByAPixel

remix of d/1829 by u/New_Core

function u(t) {

with(x)for(c.width|=i=300;j=i--/300;beginPath(stroke()))ellipse(1e3+700*C(t+j*2),500+99*S(t+j*2),50-50*C(i/60),180+160*S(-i/40),S(t)/4,0,7)

Oct 10 2020 2:29 AM UTC

}// 139/140

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Moiré Fish 🐟

u/galactustrombone

remix of a classic 👌
u/davidsover

👌👌

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KilledByAPixel

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪁼👲👭🐾𠰨𚰫𬰩𚠪𜠪𩠥𫐊𥀽𚁘𛁙𛁚𛁁𚐽🡲𚀶𛁸𛡦𪑬𫁒𩑣𭀨𦀫𚁌👚🀱𚐪𚁢👴𚡦𛑳𚠹𛑦𚐪𚁢🠰𚐬𦐬𮠽𣀿𞐫𬠨𜐹𚐺𦠪𜠬𮠩𛁚🠲𙠦𥀨𦀭𤰨𠐩𚡚𛁙𛑃𚁁𚐪𦠬𦠪𛠹𞀬𠐫𬠨𛠴𚐭𛠲𚱓𚁴𚐯𜐹𞐩𚐾𝐦𙡔𚁘𛁙𛁚𛰲𛀰𚐊𥀨𩠽𜐰𝠱𛁦𛁳🐲𞐬𜀩`.replace(/u../g,'')))

Sep 22 2020 4:53 AM UTC

}// 140/140

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Windy Tree 🍃

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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

remix of d/18074 by u/pavel

function u(t) {

c.width|=f=(X,Y,d,z=2+X*S(a=Y-4*t))=>d>>8?x.fillRect(960+1e3*X*C(a)/z,540+1e3*Y/z,6,6):[t,t+2,t+4].map(i=>f(X+C(i)/d,Y+S(i)/d,2*d));f(0,0,2)

Mar 28 2020 3:27 AM UTC

}// 140/140

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#sierpinski dance

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u/sigveseb

Very clean!
u/DataMeta

So smooth!
u/aleamb

wow! very smart code!
u/lionleaf

What an amazing dweet. And little did you know I had already planned #dancing as the theme for April. You were ahead of the times :D
u/joeytwiddle

Nice! Here is a dirtier, underrated relative: d/13611
u/Qwitter

looks glossy!
u/vain

Very nice and smooth 3D rotated and transformed sierpinski

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KilledByAPixel

function u(t) {

for(c.width=k=800;k--;x.fillText('⬤',X-(q=3+S(Math.hypot(393-X,227-Y)/99-t)**3*49)*S(t*6),Y+q*C(t*6)))j=k%23,X=k*1.1+j%2*13-49,Y=j*26-49

Jan 27 2020 11:45 PM UTC

}// 136/140

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🐝💣 https://twitter.com/beesandbombs/status/1205…

u/katkip

#illusion #Beesandbombs

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KilledByAPixel

remix of d/15354 by u/KilledByAPixel

function u(t) {

for(w=i=125;i--;)for(j=0;j<8;x.fillRect(i*20,j++?w*j+299*C((t*j*j+i/j|0)**3)/j:0,20,3e3))x.fillStyle=`hsl(${j**4-149} ${j*7}%${29*C(j)+39}%`

Jan 27 2020 1:44 AM UTC

}// 140/140

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City Outskirts

u/tomxor

Nice, you got the colours just right, I couldn't quite figure that bit out. #city
u/pavel

Just a black screen on Safari
u/KilledByAPixel

fixing up the hsl to have commas and closing paren may fix some browsers
u/tomxor

Safari is wrong, they should this dweet as a unit test :)

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