Dweets awesomed by u/Jugger

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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rodrigo.siqueira

remix of d/32215 by u/rodrigo.siqueira

function u(t) {

x.fillRect(0,0,i=w=c.width|=0,w);x.translate(960,540);for(x.rotate(3);i--;x.clearRect(T(i*i+t/49)*z/2,T(i)*z/53,w/i,w/i))z=w*590/i

Aug 10 2024 11:02 PM UTC

}// 130/140

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Space debris #stars

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aaaaaz

remix of d/19056 by u/aaaaaz

function u(t) {

z=Math.random;
a=['✊🏻','✊🏼','✊🏽','✊🏾','✊🏿']
d=a[~~(z()*5)]
x.fillText(d,z()*2120-99,1040)
x.drawImage(c,0,-2)
x.font='6em"'

Jun 6 2020 4:35 PM UTC

}// 123/140

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#blacklivesmatter

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pavel

remix of d/18610 by u/KilledByAPixel

function u(t) {

with(x)for(k=i=999;--i;beginPath(fill(arc(k+i+r*C(a=i%2?i+240*t:(i-k*t>>5)**5),540+r*S(a),r/5,0,7))))fillStyle=R(i/4),r=(S(t)/2+1+i%2)*7e4/i

May 7 2020 5:55 PM UTC

}// 140/140

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#blood #cavern 🩸 #uncompressed

u/KilledByAPixel

amazing!
u/KilledByAPixel

interesting how we made different concessions to make it fit!
u/katkip

now Hemoglobin is *l o n g e r* wow.
u/nml

looks like a red blood vessel

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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

Show more comments…
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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Cloud

function u(t) {

for(c.width|=i=5;i--;){x.font="8em s"
x.fillText("🐢",1630-(t*100/(Math.abs(C(i+1))/.2)), i*200+100+S(t*30-i)*3)}

Feb 18 2020 6:27 AM UTC

}// 112/140

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Who win?

u/13thptr

#race #funny

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ellisk1

function u(t) {

x.scale(t+=1,t);for(k=4e3;k--;x.fillRect(z=k%34+S(k)*(w=k/2e4),w*4+C(z/5+t)+1,w/2,w))x.fillStyle=S(k*k)<.6?R(0,80+S(k)*50):R(k,k%9*k,k%3*k)

Dec 21 2018 1:28 AM UTC

}// 139/140

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Merry Christmas

u/ellisk1

#christmas #tree

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Xen

function u(t) {

c.width|=i=99
for(x.translate(960,540);i--;x.rotate(C((i*T(t/14))*T(t/9))/i*2))x.rect(Z=-i*9,Z,Y=i*18,Y);
x.fill('evenodd')

Dec 20 2018 9:22 PM UTC

}// 123/140

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https://www.youtube.com/watch?v=y1aVFTetrmY Enjoy ;-)

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jylikangas

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡪㵣⹷楤瑨㴴ㄲ⭓⡴⼲⤪㤸㭶㵪ⴭ㰼㌻扥杩湐慴栨晩汬⠩⤩景爨椽㔻椭ⴻ捬敡牒散琨愪愥㜱㈬琪瘥㐰〬椬㌩⥦楬汓瑹汥㵒⡪⼲ⰹ㠭瘬樼㤸㼱㤰⵶㩪⤬汩湥呯⠹㠫匨愽椪㤸⭶⭴⼸⤪瘬㠰⭃⡡⤪瘫瘭樯㈩`.replace(/u(..)/g,"$1%")))

Dec 20 2018 8:08 PM UTC

}// 140/140

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Magical Winter Forest

Show more comments…
u/joeytwiddle

beauty
u/pavel

unreal
u/aleamb

oh man!
u/aleamb

#landscape #winter
u/katkip

cool
u/BuRRak

VERY COOL
u/zanella

OH MY GOD! SERIOUSLY?
u/Xen

Serious Awesomeness!
u/lionleaf

That's insane! Woah!
u/lionleaf

#magic #forest #xmas #snow #purple
u/magna

how do you even
u/andc2600

Amazing
u/donbright

heehee
u/rodrigo.siqueira

#christmas #tree
u/vain

I cant believe what i see from this 140 chars of compressed code. Nice colors and amazing work/execution!!

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New_Core

function u(t) {

for(c.width|=f=i=300;i--;i<9?(x.arc(960+a*30,b+i*90,20,0,7),x.fillStyle=R(i*f,50),x.fill()):0)x.rect(960,b=i*3+50,a=i*S(i*9+t),5*S(i)+9)

Dec 20 2018 3:24 PM UTC

}// 136/140

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Merry Christmas

u/cantelope

#christmas #tree

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pavel

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡩㵣⹷楤瑨簽栽ㄮ㔷〸㭪㵩ⴭ㸾㔻獴牯步⠩⥳整呲慮獦潲洨㤬〬〬㤬⡩☳〩⨸ㄬⴭ横ㄶ㈩Ɫ敧楮偡瑨⡲潴慴攨栯⠱⬱改⨪匨琫⡩㸾ㄩ⨨樫ㄩ⤩⤩ⱡ牣⡰㵩┲⨱㠭㤬瀬㤬愽㈪株椬愫栩`.replace(/u(..)/g,"$1%")))

Dec 20 2018 12:45 AM UTC

}// 132/140

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u/katkip

Cool
u/magna

#truchet
u/pavel

with(x)for(i=c.width|=h=1.5708;j=i-->>5;stroke())setTransform(9,0,0,9,(i&30)*81,--j*162),beginPath(rotate(h/(1+1e9**S(t+(i>>1)*(j+1))))),arc(p=i%2*18-9,p,9,a=2*h*i,a+h)

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