Dweets awesomed by u/hvianna

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

Please log in (or register) to post a dweet (copy-paste the code somewhere safe to save it meanwhile)


    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: #Food

show FPS hide FPS share 1 remix fullscreen

KilledByAPixel

remix of d/18500 by u/KilledByAPixel

function u(t) {

for(c.width=99,j=2e3;q=j--/2e3;x.strokeRect(S(i+3)*b+50,22+C(i)*b-q*20+(1+S(t+i)/9)*q*q*20,r=i?1-q:q*6,r))i=j%99,b=q*C(i*i)*(i?19:40)

Apr 26 2020 8:20 AM UTC

}// 133/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

🌴

Show more comments…
u/KilledByAPixel

#tree
u/tomxor

wow, nice subtle animation too.
u/aleamb

#organic
u/aleamb

#organic
u/aleamb

#organic
u/katkip

#tagfail
u/tomxor

I've done this, comment is async obviously, but the UI also waits so you can keep clicking post on the same comment... could do with locking the UI after submit.

show FPS hide FPS share 1 remix fullscreen

tomxor

remix of d/18484 by u/jylikangas

function u(t) {

for(w=i=c.width=256;--i;x.fillRect(...(i&1?[6+X,6+Y,48,36]:[(t+++S(t))*20.372%w+i%9,1+X%w,4,2,x.transform(0,1,-1,0,w,0)])))X=i%9<<6,Y=i%5<<6

Apr 25 2020 11:25 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

#City #Traffic #Simulator v2

u/tomxor

They are mostly behaved at the junctions, few maniacs' here and there...
u/KilledByAPixel

👍
u/jylikangas

Very clever to use transform here! Thanks for improving this.
u/tomxor

Thanks for starting the idea, was really fun making this one.

show FPS hide FPS share 1 remix fullscreen

KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪁼👩🐹𛁸𛡴𬡡𫡳𩡯𬡭𚀱𛀰𛀱𛀱𛁱🐴𜀰𚱓𚁴𚐪𜰰𜁼𜀬𝠰𜀩𞱩𛐭𞰩𩡯𬠨𪠽𢀽𜐲𝐫𤰨𪐫𬐯𞐹𚐪𝰵𯀰𞰭𛑪𞱪🀵𜀦𙡸𦱦𧐨𦀫𢀬𜐭𢀬𛠵𛁺𚐩𮁛𩠽𙱦𪑬𫁒𩑣𭀧𧐨𦀽𪐪𞐹𚱪𛀭𪠬𜠬𮠽𜠵𛁸𛡦𪑬𫁓𭁹𫁥👒𚁺𛁪𛁈𚐩𛁸𦱦𧐨𦀬𮠭𪠬𝐰𛀮𝰩`.replace(/u../g,'')))

Apr 25 2020 11:22 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Cube Wave #default #d3

show FPS hide FPS share 1 remix fullscreen

KilledByAPixel

function u(t) {

_='🐑🌹'
eval(unescape(escape`𦀽𚰫𥀥𝠴𒡣𛡷𪑤𭁨𯀽𫱮𫑯𭑳𩑤𫱷𫠽𧰽🡓🠰🰰𞡓👖🐴𞐊𤰽𘑴𯁼𤰼𜰰𜀦𙡘🠴𝰿𥀽𥠽𜀺𤰾𜀿𤰫👖𛐽𜠺𜀊𮀮𩡯𫡴🐧𜰰𩑭𘠧𒡸𦱦🐧𩡩𫁬𥁥𮁴𙱝𚁟𛀱𜰱𜀬𞐸𜀭𤰩𒡸𦱦𧐨𦰮𛠮𧱝𦰱𧐬𦀪𝀵𛐱𩐳𛀱𜀴𜀩𒡸𦱦𧐨𥀾🠶𛀹𛀳𝀹𚐻`.replace(/u../g,'')))

Apr 24 2020 5:49 PM UTC

}// 138/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Counting Sheep Game 🐑 Click to jump! #game

u/iznax

_='🏃🚧'
u/katkip

#interactive

show FPS hide FPS share 1 remix fullscreen

jylikangas

function u(t) {

c.width=-1
for(k=i=150;i--;)x[f="strokeRect"](i%6*64,i/5<<6,-37,i&3?40:20)
for(;i++<k;x.rotate(11/7))x[f]((i*32+t*k)%620-300,(i/2<<5)-k,9,4)

Apr 24 2020 1:34 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

City Traffic Simulator

u/katkip

#city #simulation
u/tomxor

Nice! deserves some remix :)
u/Xen

nice
u/KilledByAPixel

🚗

show FPS hide FPS share 3 remixes fullscreen

rodrigo.siqueira

remix of d/18458 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>S(S(9*c/d)*t),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))*(d/2+Y),3))x.fillStyle=R(C(r=X*X+Y*Y)*125),d=r>1||T(r)

Apr 23 2020 5:58 PM UTC

}// 139/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Red Sphere Reflection #raytracing (high resoluton)

Show more comments…
u/Xen

Tf Dude! top dweet right here 😍
u/lionleaf

That's amazing!
u/lionleaf

#glass #sphere
u/stiaje

#witchcraft
u/Ath0r

Impressive, great job!
u/katkip

genius script
u/PoweredByWill

wow. dwitter povray.
u/mole

I am shooketh. This is absolutely incredible.
u/katkip

#slowrender
u/cli

This is great.
u/Nascretis

Actually insane. #witchcraft

show FPS hide FPS share fullscreen

KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛀲𩐳𛀲𩐳𚐬𪐽𜰻𪐭𛐻𪑼𦐼𜁼𘑱𙠦𮀮𩡩𫁬𥁥𮁴𚁱🰧𧁵𜠶𜀰𧁵𡡅𜁆𙰺𭑮𩑳𨱡𬁥𚁠𙑵𡀸𜱃𙑵𡁆𜐤𮰨𭀪𝀯𣑡𭁨𛡐𢐫𛠵𚐥𞀫𜑼𜁽𨀩𛁱🰵𜠰𞠸𝠰𛑓𚁴𚐪𝠹𞐬𬐿𝰶𝐺𝠰𜀫𦐩𚑱👩𛐱𛁸𛡦𫱮𭀽𨀤𮱱🰴𜀺𞑽𩑭𘡠𛁙👃𚁴𚐪𞐹`.replace(/u../g,'')))

Apr 22 2020 8:11 PM UTC

}// 139/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

☀️+🌗

show FPS hide FPS share 6 remixes fullscreen

pavel

function u(t) {

for(f=c=>Math.tanh((r>1?3:13)*S(9*c/d)),Y=t/3-1,i=2e3;i--;x.fillRect(i,t*180,(1+f(X)*f(Y))*(d/2+Y/3.6),3))X=i/540-16/9,r=X*X+Y*Y,d=r>1||C(r)

Apr 22 2020 6:18 AM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Experimenting with #raytracing. I finally figured out why the cosine trick from d/1112 works.

u/Cloud

WOW!

show FPS hide FPS share fullscreen

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

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

#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.

show FPS hide FPS share 1 remix fullscreen

KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑴🠱𛠰𜠿𩡩𫁬𥁥𮁴𚁓𭁲𪑮𩰮𩡲𫱭𠱯𩁥𤁯𪑮𭀨𝐵𜰵𝠬𝐶𝀸𜐫𠑛𭀽𭀪𝠰𛐶𜡼𜁝𚐬𭀥𜐳𚠱𝀸𛀲𞀹𚰨𭀯𜐳𯀰𚐪𜠱𞐩𞡴🰫𚱩𙐱𝠭𜐱𙠦𪐥𜐶🀱𝀿𠐮𬱰𫁩𨱥𚀨𠐮𫁥𫡧𭁨𚰱𚐪𣑡𭁨𛡲𨑮𩁯𫐨𚐬𜀬𪐩𞡦𫱮𭀽𙰱𝁥𫐢𙰺𠐽𦱩🐰𧐻`.replace(/u../g,'')))

Apr 8 2020 3:04 PM UTC

}// 134/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

Shuffled Deck of Playing #Cards 🃏

u/katkip

#text

dwitter.net | hvianna (8379)