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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pavel

remix of d/11426 by u/Quant1um

function u(t) {

t?w=c.width|=onclick=e=>{i+=e.x/7-X/s,j+=e.y/7-Y/s}:s=i=j=X=Y=20
x.fillRect(X+=i*=(i<0?X>0:X<w)||-.7,Y=++j+Y>1e3?(i*=.9,j*=-.7,1e3):Y+j,s,s)

Dec 16 2018 3:34 AM UTC

}// 140/140

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BalintCsala

function u(t) {

c.width=500
for(x.scale(i=5,5);i--;k=S(t*5),x[H]("⚪",S(T=(i?k>0:k<0)?k:0)*20+23+i*42,C(T)*20+30))x[H="fillText"]("⚪",30+i*7,50)

Sep 7 2018 8:45 AM UTC

}// 127/140

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Newton's cadle

u/fujimotos

#physics

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KilledByAPixel

function u(t) {

eval(unescape(escape`󭌿󨼮󭽩󩍴󪍼󟝯󫭭󫽵󬽥󩍯󭽮󟝟󟜾󥌽󜌺󚍘󟝙󟜵󜌰󛍖󟝗󟜲󞜩󒭔󟽯󫭭󫽵󬽥󭝰󟝟󟜾󥌽󜜺󥬽󚍗󟝅󛭹󛼳󛝙󛼹󛍅󛭸󚬳󛝘󚜯󞜊󫽮󫝯󭝳󩝭󫽶󩜽󩜽󟭅󟝥󒭸󛭦󪝬󫌨󮌮󨝲󨼨󦌫󟝖󚬽󚍘󚽖󛜹󝬰󚜪󚬲󟌷󩜵󟼱󞬭󛬸󛍙󚼽󥼪󟜨󦜫󥼭󝜳󜌩󚬪󜬼󜭥󝜿󜜫󜜯󥼺󛜮󞌬󞜹󛌰󛌹󚜩`.replace(/u../g,'')))

Jun 24 2023 8:27 PM UTC

}// 140/140

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Bounce the Ball ⚫ #interactive

u/magna

#physics

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KilledByAPixel

remix of d/22982 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`󩭯󬬨󭼽󨼮󭽩󩍴󪌦󟝩󟜱󜌳󝬸󞼭󛝩󞽶󟜽󜭼󭬦󜼪󘝔󦽓󟝩󚼨󪜪󭍞󪜩󙜳󛜱󚼨󭬾󜝼󤼦󜜿󭬦󜬿󛝷󞭷󞬰󚝝󟽔󦽩󧜽󚍔󦽓󧜽󭬩󙬲󟽶󛜲󞬰󞭯󫭭󫽵󬽥󫝯󭭥󟝥󟜾󥍛󭼪󚍥󛭹󚬨󭼯󟝩󫭮󩝲󥽩󩍴󪌩󯌰󚜫󩜮󮌪󭽼󜍝󟝥󛭢󭝴󭍯󫭳󚝸󛭦󪝬󫍒󩝣󭌨󪜥󭼬󪜾󟬷󛌱󛌨󭬽󥍛󪝝󚜯󝜩`.replace(/u../g,'')))

Jun 4 2021 4:58 PM UTC

}// 140/140

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Tiny Sandbox ⌛ Use mouse buttons to place... None 🧼 Erase, L 🌊 Water, M 🧱 Wall, R ⚡️ Lightning Eraser, L+M ⌛️ Sand, R+M 🌱 Vines, L+R ⛈️ Rain Storm, L+M+R 🌪️ Sand Storm

u/KilledByAPixel

Add the code onmousedown=oncontextmenu=_=>!1 to improve usability (prevents other mouse events)
u/KilledByAPixel

#interactive #physics #game
u/KilledByAPixel

#sand
u/SockTaters

This amazes and confuses me. I am stupefied

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Feiro

function u(t) {

eval(unescape(escape`砮獴牯步⠩㭯湭潵獥浯癥㵲㴨椬瘬戬䬩㴾瘿砮汩湥呯⡶ⱢⱣ⹷楤瑨簽䄽䵡瑨⹡瑡渲ⱌ㵟㴾筲⡩ⴱⱶ⬹㤪䌨䬽卛楝㼿〩Ɫ⬹㤪匨䬩⤻卛楝㵋⭁⡍⹹ⵢⱍ⹸⵶⤭䄨搭戬猭瘩紬椿䰨䰨⤩㨨猽瘬搽戩⤺爨㘬㤶〬㔴〬䴽椩`.replace(/u(..)/g,"$1%")))

Jun 16 2020 11:14 PM UTC

}// 140/140

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Inverse Kinematics! (works best in full screen)

u/Feiro

uncompressed: x.stroke();onmousemove=r=(i,v,b,K)=>v?x.lineTo(v,b,c.width|=A=Math.atan2,L=_=>{r(i-1,v+99*C(K=S[i]??0),b+99*S(K));S[i]=K+A(M.y-b,M.x-v)-A(d-b,s-v)},i?L(L()):(s=v,d=b)):r(6,960,540,M=i)
u/katkip

awesome #physics
u/tomxor

Nice! strangley broken in FireFox though
u/tomxor

Oh it's the new nullish coalescing operator ??

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KilledByAPixel

function u(t) {

t?c.width|=0:a=[]
for(i=9;i--;a[i]?x.fillRect(400+i*99+S(a[i]+t)*300,400,50,200):a[i]=i)
for(j=9;t&&j--;)a[i]+=.001*S(a[j]-a[i])

Dec 30 2019 4:00 AM UTC

}// 128/140

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Synchronization - Kuramoto Model #Default

u/joeytwiddle

#physics https://en.wikipedia.org/wiki/Kuramoto_model
u/katkip

AWESOME!

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cantelope

remix of d/11465 by u/pavel

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡦楬汒散琨〬〬挮睩摴桼㵩㴵ⰲ攳⤬獣慬攨㤬㤩ⱱ㵃⠵⩴⤻椭ⴻ晩汬⡳瑲潫攨⤩⥳瑲潫敓瑹汥㵦楬汓瑹汥㵠⍦〸怬浯癥呯⡘㴷㈫ㄷ⩩ⰰ⤬慲挨堭㘵⩓⡡㴨焾〿椺椭㐩㽱⼵〺焩ⰶ㔪䌨愩ⰸⱡⴱ⸵㜬㜩`.replace(/u(..)/g,"$1%")))

Dec 20 2018 7:24 PM UTC

}// 139/140

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u/katkip

More #physics?

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katkip

remix of d/9683 by u/katkip

function u(t) {

c.width^=0;for(i=0;i++<9;)β=(K=t/frame*i,K-t--)*K-C(frame/K/i)-(t--+18.19*i/(V=4/K,V**3))*K/i,x.fillRect(250+i*100+C(β/7)*300,400,50,200)

Sep 9 2018 9:37 AM UTC

}// 137/140

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Magnetic formula applied on #default

u/donbright

ha ha awesome
u/katkip

Thx. Looks like you are the only one who understood it XD
u/magna

#physics

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donbright

remix of d/1399 by u/Kalanchoe

function u(t) {

c.width^=0
t?o.push({X:1,Y:1,U:S(t),V:C(t)}):o=[]
o.map(a=>{Q=a.X**2+a.Y**2,a.X+=a.U-=a.X/Q,a.Y+=a.V-=a.Y/Q,x.fillRect(a.X,a.Y,9,9)})

Mar 28 2017 1:45 AM UTC

}// 133/140

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Another fake gravity sim. This time, some particles get slingshotted out of the system, past escape velocity, others teeter on the brink, and others congregate at 0,0. After a while, the screen is full of a bunch of particles leaving, and others coming back in towards the origin.

Show more comments…
u/nonce

your gravity sims are amazing.
u/z3vin

agreed
u/donbright

thanks this site is very inspiring
u/alien

WOW ,Hi what does this mean :D c.width^=0
u/donbright

alien it basically clears the screen to the default width. in detail, i think it is combining "binary xor" with "set equal to", so basically c.width = c.width xor 0, and since anything xored with 0 is itself, its basically setting c.width to itself.
u/donbright

#physics

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donbright

remix of d/1816 by u/SpecialAgent

function u(t) {

t?Δ=[]:P=[99,0,0,0,1,0,0,.6]
for(Q=i=4;i--;)Q+=(Δ[i]=P[(2+i)%4]-P[i])**2/2
for(j=4;j--;)x.fillRect(P[i=j*2],P[i+1],2,2),P[j]+=P[j+4]+=Δ[j]/Q

Mar 24 2017 11:16 PM UTC

}// 140/140

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Quickstart - alter numbers in P for fun patterns. Long description - this is a simulation of two body gravitational motion using a simplified form of Calculus.

u/donbright

combine F=ma with F=GM1M2/R^2 except that G=1, M1=1, M2=1 and r^2 is r
u/donbright

Explanation here https://www.patreon.com/posts/simulating-in-…
u/donbright

oh btw P[x1,y1,x2,y2,xv1,yv1,xv1,yv2] where 1,2 = object 1,2, x,y=position, v = velocity initial
u/codeslaw

This is incredible!
u/donbright

#physics

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