Top #physics dweets

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: #ScaryMovies

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KilledByAPixel

remix of d/13326 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`猽挮獴祬攻献扡捫杲潵湤䉬敮摍潤攽❳捲敥渧㭦潲⡢㵛椽㤹崻椭ⴻ扛楝㵠牡摩慬ⵧ牡摩敮琨⑻匨椪椩⨲⬲⸵絥洠慴․笵〫ㄵ⩓⡱⥽┤筙紥Ⱔ筒⠲㔵ⱙⱙ⼷ⱙ⼴㤭⸳⥽Ⱓ〰〩怩夽㐸⬲㘪䌨焽椫琩㭳⹢慣歧牯畮搽戻`.replace(/u(..)/g,"$1%")))

Jul 17 2019 6:58 PM UTC

}// 140/140

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#blackhole ~ Tribute to the first image produced of a black hole.

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u/donbright

#astronomy #physics
u/rodrigo.siqueira

You did (better) in 140 characters what scientists did in 5 petabytes (5000000000000000 bytes) of data, enough to create about 36 trillion of dweets.
u/KilledByAPixel

Psssh. Those scientists need to learn javascript.
u/metamero

I very much wanted to do this tribute when it came out, but I couldn't and know I'm happily contemplated by this =]
u/iverjo

Impressive!
u/katkip

Awesome!
u/Leodude123

Coooooool!!

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yonatan

function u(t) {

t?c.width|=0:U=V=Y=X=.1
d=X*X+Y*Y>1&&(X*U+Y*V)**.7
X+=U-=X*d
Y+=V-=Y*d-.01
x.arc(a=540,a,a,0,9)
x.arc(a+X*a,a+Y*a,40,0,9)
x.fill('evenodd')

Sep 25 2018 1:35 PM UTC

}// 139/140

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Phunky Physics

u/joeytwiddle

Fun! #bounce
u/cantelope

the last paramater of x.arc can be 7, 8, or 9 as a single digit that closes the circle.. i usually go with 7 because it's the closest integer > 2π, but it's interesting that you go with 9 usually :)
u/joeytwiddle

#physics

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pavel

remix of d/13487 by u/KilledByAPixel

function u(t) {

for(i=t?c.width|=d=_=>u[j=q&-64|p>>6]=-!u[j]|1:(p=q=540,r=7,s=4);i--;)u[i]||x.fillRect(i?i%64*64:p+=r*=d(p+=r),i?i:q+=s*=d(q+=s),z=i?64:9,z)

Apr 27 2019 4:26 AM UTC

}// 140/140

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#breakout #tribute

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u/pavel

Had to make some visual sacrifices to get this #uncompressed
u/pavel

I discovered p+=r*=d(p+=r);q+=s*=d(q+=s) as part of messing around with this. Why does it work?
u/pavel

:)
u/KilledByAPixel

Oh wow, nice! That's the code that updates the position, velocity and applies collision for x and y. It needs to call the d function to check its colliding and also set the block to 1 if it does. It needs to check x and y separately so it knows which side to bounce off
u/pavel

Notice how d only takes one argument, and it ignores it.
u/KilledByAPixel

I see what you did there. So many great tricks in this one.
u/pavel

p+=r*=d(p+=r) the inner p+=r increments p and d ends runs with that value, however the outer p+= caches the old value of p so when d resolves the inner p+=r is silently ignored!
u/pavel

#physics

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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

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Joachim

function u(t) {

eval(unescape(escape`󮬽󨼮󭽩󩍴󪍼󟝴󟼰󞬨󨬽󮽸󞬹󝬰󛍹󞬵󝌰󯜬󫌽󜌩󒭸󛭦󪝬󫍒󩝣󭌨󨬮󮌬󨬮󮜬󞜹󛌹󞜩󒭸󛭦󪝬󫌨󮌮󨝲󨼨󭌪󞜹󞜫󫌬󝜷󜌫󫌬󜬵󛌰󛌷󚜩󒭩󩬨󭌾󜜩󮽢󛭸󚼽󜜰󛽴󒭬󛜽󜜰󛽴󒭴󟌲󟽢󛭹󚼽󤼨󭌭󜜩󚬹󞬰󯜊󮌮󩭩󫍬󤭥󨽴󚌹󝬰󛌶󜼹󛌹󞜬󜬴󝜩󒭸󛭦󪝬󫍒󩝣󭌨󜌬󞌸󜌬󮬬󞜩`.replace(/u../g,'')))

Aug 27 2021 8:00 AM UTC

}// 140/140

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block #physics

u/vain

wtf? great physic like fx

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pavel

remix of d/13902 by u/KilledByAPixel

function u(t) {

for(c.width|=S*S<2e4|C*C+9*C>55?onclick=_=>v=-20:S=v=m=0,C=64-m++%98,S+=v++,i=3;i--;)x.fillRect(591+!!i*C*25,[S+491,0,720][i],s=i?360:98,s)

May 17 2019 4:24 AM UTC

}// 139/140

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Click to flap #interactive #game

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u/pavel

Should give you plenty of characters for an improved compressed version
u/KilledByAPixel

amazing
u/joeytwiddle

Fantastic!
u/username

well, it is not like Flappy Bird anymore. it is just two squares at the same position all the time instead of tubes at random heights
u/username

and I feel like it is constructed in a way that makes any improvements very hard
u/KilledByAPixel

it's a demake of a demake. some really good ideas though, i've already used them to chip off a few more bites from my version
u/pavel

#physics
u/IV

needs the airwolf theme tune :)
u/pavel

#flappybird

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tomxor

remix of d/19655 by u/tomxor

function u(t) {

eval(unescape(escape`𭑛𭁼𮀮𩡩𫁬𤡥𨱴𚁸𛡧𫁯𨡡𫁁𫁰𪁡🐱𛱴𛀰𛀲𩐳𛀲𩐳𚑝👛𞐶𜀬𝐴𜀬𜰬𜰯𭁝𞱵👴🱵𛡭𨑰𚀨𦱏𛁯𛁡𛁢𧐩🐾𚁵𛡭𨑰𚀨𦱒𛁍𧐩🐾𚁔👯𛑍𛁘👏𛑒𛁦🐨𦀪𦀯𜰫𥀪𥀯𜰩𚠪𜐮𝐯𝀸𚰲𛁡𛐽𦀯𩠬𨠭👔𛱦𚐩𛁸𛡣𫁥𨑲𤡥𨱴𚁏𛁯𛀹𛀹𚐬𦱏𚱡𛁯𚱢𛁡𛁢𧐩𚐺𦱝`.replace(/u../g,'')))

Aug 13 2020 7:52 PM UTC

}// 140/140

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#nbody #gravity

u/tomxor

... #waitforit initialising chaos quickly is hard
u/tomxor

This is not very accurate of course, in particular it has quite bad iteration bias - and it's possible my math is wrong. It kinda looks right though I think.
u/Xen

sexy!
u/DataMeta

wow, cool! #physics #simulation

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tomxor

remix of d/17768 by u/tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𝐶𞀻𫠽𭀿𫠮𫑡𬀨𚁛𠐬𠠬𦀬𦐬𥁝𚐽🡛𠐫𚁃𛑘𚐯𞐹𛁂𚰨𤰭𦐩𛰹𞐬𦀫𠐯𝀬𦐫𠠯𝀬𥀬𮀮𩡩𫁬𤱴𮑬𩐽𤠨𜐲𝰫𠐪𞐬𞐹𚱂𚠹𛀲𝐵𛁳👔𛱴𚐬𮀮𩡩𫁬𤡥𨱴𚁘𛁙𛁳𚠽𞐬𬰩𧐩𞡛𧐻𫱮𫑯𭑳𩑭𫱶𩐽𚁻𮀬𮑽𚐽🡮𦱴𚠶𜀦𜠵𝑝👛𮀭𠰬𮐭𤰬𠰽𮀬𤰽𮐬𭁝`.replace(/u../g,'')))

Jul 3 2020 12:09 AM UTC

}// 140/140

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Conjure a Spell !

u/tomxor

#interactive #particles #physics
u/1593619985251admin@google.com

fancy
u/katkip

isn't "cast" the right word :D
u/tomxor

lol i guess so, naming #fail :D

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Quant1um

function u(t) {

t||(l=r=9,m=0,k=.02,d=.05,c.onclick=e=>r=e.y/28)
for(c.width|=i=99,x.lineWidth=l+=m+=k*(r-l)-m*d;i--;)x.lineTo(S(i/3)*80+960,i*l)
x.stroke()

Sep 18 2018 12:00 PM UTC

}// 140/140

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Interactive damped spring simulation #physics #interactive

u/Quant1um

You can try different stiffness(k) and dampening(d) factors
u/donbright

yayyy
u/Quant1um

u/donbright, https://www.myphysicslab.com/pendulum/double…
u/Quant1um

Ow, sorry, this meant to be under double pendulum post

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Quant1um

function u(t) {

eval(unescape(escape`瑼簨礽稽昽㐸㜬椽樽〩㭯㵓⡤㵺⵹⤬栽椪椪昪漫匨稩⼲Ᵽ⹷楤瑨簽愽㤶〬戽㤹ⱛ〬礫㵩⬽欽⡪⩪⩦⩯ⵓ⡹⤫株䌨搩⤯⠱⭯⩯⤯昬稫㵪ⴽ栯昫欪䌨搩崮浡瀨椽㹸⹬楮敔漨愫㵓⡩⤪㌰〬戫㵃⡩⤪㌰〩⤬砮獴牯步⠩㬻`.replace(/u(..)/g,"$1%")))

Sep 16 2018 3:17 PM UTC

}// 140/140

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Double pendulum simulation #physics

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u/BirdsTweetCodersDweet

t||(y=z=f=487,i=j=0,x.lineWidth=5,x.globalAlpha=.02);o=S(d=z-y),h=i*i*f*o+S(z)/2,a=960,b=99,[0,y+=i+=k=(j*j*f*o-S(y)+h*C(d))/(1+o*o)/f,z+=j-=h/f+k*C(d)].map(i=>x.lineTo(a+=S(i)*300,b+=C(i)*300)),x.stroke(); this is cool...
u/iverjo

Nice
u/Quant1um

Thanks!
u/donbright

holy crow
u/donbright

how does it work??
u/Quant1um

u/donbright, https://www.myphysicslab.com/pendulum/double…

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