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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maggymoo

function u(t) {

c.width=1000;T=t%5;X=T*450-200-(T*T*40);Y=500-(Math.abs(S(T*T)*400/(T*T)));x.arc(X,Y,20,0,2*Math.PI);x.fill();x.fillRect(0, 520, 1000, 30);

Dec 27 2017 3:38 PM UTC

}// 139/140

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u/katkip

#physics

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pavel

remix of d/14376 by u/pavel

function u(t) {

eval(unescape(escape`瑼簨瀽焽刽㌵〬堽夽爽猽㔩㭐㵰ⵘ㭑㵱ⵙ㭐⩐⭑⩑㸱攵☦⡕㵐⼱㔬嘽儯ㄵ⤻砮慲挨瀫㵲⨽瀾㵒♰㰱㔷ぼ簭ㄬ焫㵳⨽焾㵒♱㰷㌰籼ⴱⱒⰰⱣ⹷楤瑨簽〩㭸⹡牣⡘⬽唬夫㴫⭖ⰳ㔬〬㜩㭸⹦楬池敶敮潤摠`.replace(/u(..)/g,"$1%")))

Jun 2 2019 7:17 AM UTC

}// 134/140

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#physics #bounce #compressed

u/pavel

172 t||(p=q=R=350,X=Y=r=s=5);P=p-X;Q=q-Y;P*P+Q*Q>1e5&&(U=P/15,V=Q/15);x.arc(p+=r*=p>=R&p<1570||-1,q+=s*=q>=R&q<730||-1,R,0,c.width|=0);x.arc(X+=U,Y+=++V,35,0,7);x.fill`evenodd`
u/DataMeta

Would be very cool to see the ball decoupled from the container's reference frame. Could it fit within a compressed dweet?
u/pavel

it is decoupled
u/DataMeta

Somehow missed that. Awesome.

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Jezza

function u(t) {

f=(a,b)=>55*i*b((t+99)/(1+a));c.width|=p='☉☿♀♁♂♃♄♅♆♇';x.font='4em m';for(i=0;i<10;i++)x.fillText(p[i],960+f(i,C),540+f(i,S))

Apr 9 2019 2:02 AM UTC

}// 124/140

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A not-at-all-accurate orrery

u/KilledByAPixel

cool idea
u/donbright

#astronomy #planets #physics
u/IV

#text

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BalintCsala

function u(t) {

c.width=280
for(i=9;i-->-1;)x.fillRect(D=i*20+(K=-(t%1)*20),D,W=20,W)
x.font="30px A"
x.fillText("●",83,82+K+(Math.max(t%1-.5,0)*2)**2*20)

May 4 2018 7:39 PM UTC

}// 138/140

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Pseudo falling physics

u/iverjo

Deserves more kudos :D
u/BirdsTweetCodersDweet

changing the last part to ... **2*25makes it more realistic, with more gravity and even a little bounce at the end... Also, removing the W variable saves you a byte :P
u/jylikangas

Actually you could use T in place of W and use it in place of every 20 to save 3 bytes. :)
u/katkip

#physics

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rodrigo.siqueira

remix of d/27249 by u/deobfuscate

function u(t) {

x.beginPath()
for(c.width|=i=9;i--;x.stroke())n=150*i,z=S((i+2)*C(t+i))*140+600,x.lineTo(X=370+n+S(t)*300,z),x.fillRect(X-25,z,50,-200)

Mar 24 2023 1:54 PM UTC

}// 135/140

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Reciprocating motion #default

u/deobfuscate

Definitely cool!
u/magna

#physics

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tomxor

function u(t) {

c.width=99;x.fillRect(X+=a=S(X/30)<0?-a:a,Y+=b=Y>52?-b:b+.3,4,4)}{X=b=Y=a=1

Oct 26 2019 2:20 PM UTC

}// 75/140

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75byte #physics

u/tomxor

Perfect collision integration, since uniform gravity is constant it should cancel out in such a simple case, in which case integration can be skipped on a collision interval ?-b:b+.3 this is why it doesn't loose or gain significant hight on average
u/tomxor

To make it absolutely perfect this can also be changed to ?-b:b+.25 which will eliminate integration error since .25 is a non periodic binary fraction... it will bounce forever :)
u/tomxor

... but that would cost an extra byte so its no good !

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pavel

function u(t) {

for(c.width|=i=99;S[u[t]=t]=x[t]=i--;x.fillRect(960+(u[i]+=S[i]-=u[i]/d),540+(x[i]+=C[i]-=x[i]/d),C[t++]=9,9))d=(u[i]**2+x[i]**2)**1.5/7e3

Feb 28 2019 5:17 AM UTC

}// 138/140

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#physics #orbit #orbits

u/pavel

Funky start due to lack of chars but quickly settles. Imagine a black hole in the middle.

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joeytwiddle

remix of d/3153 by u/joeytwiddle

function u(t) {

c.width|=0;for(i=p=0;i++<252;x.fillRect(370+i*5,70+i/2+o,5,700),p=o)o=(S(i**1.3/180-t*11)+C(i**1.4/600-t*8))*i**.6,x.globalAlpha=.5+(o-p)/9

Sep 8 2017 4:06 PM UTC

}// 139/140

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Plain flag, with shading and double wobble

u/joeytwiddle

Greyscale redux. Full-color version here: https://codegolf.tk/a/168
u/joeytwiddle

Both colours and shading in d/7473 by Balint
u/joeytwiddle

The **s make the #flag flick at the end. #physics?

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katkip

function u(t) {

c.width*=1;f=(X,Y,s)=>{if(s>2){x.arc(X,Y,s,0,-7,s,q=S(t*2-s)/(1+t)*2,f(X+s*2/3*S(q),Y+s*2/3*C(q),s/3)),x.stroke()}else{}}
f(960,540,400)

Oct 16 2020 4:10 PM UTC

}// 136/140

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fake #physics

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pavel

remix of d/14376 by u/pavel

function u(t) {

t?x.arc(w=960,h=540,h,0,c.width|=0):X=Y=1e3
X*X+Y*Y>2.4e5&&(r=C(t*t)*8+12,U=-X/r,V=-Y/r)
X+=U;Y+=++V;x.arc(w+X,h+Y,5*r,0,7);x.fill`evenodd`

Jun 6 2019 5:00 AM UTC

}// 139/140

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#physics #bounce updated so ball size reflects speed

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