New #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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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pavel

remix of d/10076 by u/yonatan

function u(t) {

t?X*X+Y*Y>2.4e5&&(v=C(t*t)/42-.07,U=v*X,V=v*Y):U=V=Y=X=3
X+=U;Y+=++V
x.arc(w=960,h=540,h,0,c.width|=0);x.arc(w+X,h+Y,40,0,7)
x.fill`evenodd`

Jun 2 2019 12:27 AM UTC

}// 140/140

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#physics #bounce

u/pavel

The velocity of the bounce changes on every hit, otherwise the ball would settle on a simple pattern

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katkip

function u(t) {

c.width*=1;t||(y=v=1);for(i=2;i--;)x.beginPath(),x.fill(i?x.arc(960,880,200,0,7):x.arc(960,180+y,60,0,7));v+=.4,y+=v;if(y>440)y=440,v*=-.4

Jun 1 2019 9:38 AM UTC

}// 138/140

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Perfect #physics

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katkip

remix of d/14138 by u/katkip

function u(t) {

c.width*=1;t||(X=80,Y=40,v=20,V=8);x.fillStyle=R(V*9);x.fillRect(X,Y,99,99);X+=v,Y+=V;V++;if(Y>989)V*=-.9;if(X>1831||X<0)v*=-.9;v*=1.001;

May 24 2019 2:28 PM UTC

}// 137/140

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#physics #collision #hitbox #rect #bounce #bouncy #velocity #gravity #simulation #math

u/katkip

Less friction

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katkip

function u(t) {

c.width*=1;t||(X=80,Y=40,v=20,V=8);x.fillRect(X,Y,99,99);X+=v,Y+=V;V++;if(Y>989)V*=-.7;if(X>1831)v*=-.5;v/=1.005

May 24 2019 2:24 PM UTC

}// 112/140

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#collision #hitbox #square #physics #fall #math #velocity

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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

Show more comments…
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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katkip

function u(t) {

eval(unescape(escape`挮睩摴株㴱㭦㴨堬夬朩㴾筸⹴牡湳污瑥⡘ⱙ⤬砮牯瑡瑥⡧⤬砮瑲慮獬慴攨ⵘⰭ天紻景爨椽㤻椭ⴻ⥸⹦楬汒散琨㐰〫椪㄰〫匨琩⨳〰ⰴ〰ⰵ〬㈰〩ⱦ⠴〰⭩⨱〰⭓⡴⤪㌰〬㐰〬䌨琪㤫椯㈩⼨㤫琪琪㤩⤻`.replace(/u(..)/g,"$1%")))

May 16 2019 1:49 PM UTC

}// 135/140

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c.width*=1;f=(X,Y,g)=>{x.translate(X,Y),x.rotate(g),x.translate(-X,-Y)};for(i=9;i--;)x.fillRect(400+i*100+S(t)*300,400,50,200),f(400+i*100+S(t)*300,400,C(t*9+i/2)/(9+t*t*9))

u/katkip

#default #coil #bounce #physics

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katkip

function u(t) {

eval(unescape(escape`爽䵡瑨⹲慮摯活挮睩摴株㴱㭩昨ⅴ⥻焽孝㭦潲⡩㴳㤻椭ⴻ⥱⹰畳栨孩⨵〭爨⤪㈵ⰵ㤰ⰱ崩素景爨椠潦ⁱ⥸⹦楬汒散琨楛そ⬽⡲⠩⴮㔩⩩嬲崬⡩嬱崼㄰㈰㽩嬲崫㵲⠩㩩嬲崪㴭⸷Ⱪ嬱崫㵩嬲崩ⰵ〬㔰⤻`.replace(/u(..)/g,"$1%")))

May 15 2019 1:01 PM UTC

}// 134/140

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#default #collision #physics #fall #gravity #velocity #bounce #bouncy

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katkip

function u(t) {

eval(unescape(escape`挮睩摴株㴱㭩昨琥㠼⸲⥻焽孝㭦潲⡩㴹㭩ⴭ㬩焮灵獨⡛㐰〫椪㄰〬㐰〬ㅝ⥽⁦潲⡩⁯映焩砮晩汬剥捴⡩嬰崬⡩嬱崼㠸〿楛㉝⬽䵡瑨⹲慮摯洨⤺楛㉝⨽⴮㤬楛ㅝ⬽楛㉝⤬㔰ⰲ〰⤻`.replace(/u(..)/g,"$1%")))

May 15 2019 12:53 PM UTC

}// 125/140

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Gravity #default #collision #physics #fall #gravity #velocity

u/katkip

not golfed c.width*=1;if(t%8<.2){q=[];for(i=9;i--;)q.push([400+i*100,400,1])} for(i of q)x.fillRect(i[0],(i[1]<880?i[2]+=Math.random():i[2]*=-.9,i[1]+=i[2]),50,200);
u/katkip

#bounce #bouncy

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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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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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