Dweets awesomed by u/flyink

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 fullscreen

Pascal

function u(t) {

eval(unescape(escape`𨰮𬱴𮑬𩐮𩡩𫁴𩑲🐢𨡬𭑲𚀱𜁰𮀩𨱯𫡴𬡡𬱴𚀹𞐩𪑮𭡥𬡴𚀩𘠻𮀮𩡩𫁬𤡥𨱴𚀰𛀰𛀱𞐲𜀬𜐰𞀰𚐻𩡯𬠨𪠽𜡥𜰻𪠭𛐾𜀻𚑲🐲𜀰𛰨𦠽𚁔𚁪𚠮𝠱𚐭𭀯𜠰𚐥𜐩𛁸𛡣𫁥𨑲𤡥𨱴𚁃𚁪𚐪𬠫𞐶𜀬𤰨𪠪𪠩𚡲𚰵𝀰𛀶𜀯𦠪𚠰𛠵𛀶𜀯𦠪𚠰𛠵𚐠`.replace(/u../g,'')))

Dec 13 2020 1:55 PM UTC

}// 131/140

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

Liquid cow #metaballs

u/magna

Wow!

show FPS hide FPS share 1 remix fullscreen

KilledByAPixel

remix of d/16862 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𪐽𞐹𝠻𭱩𭁨𚁸𚑦𫱲𚁳𩑴𥁲𨑮𬱦𫱲𫐨𜐬𜀬𜀬𜐬𚁴𚠽𝰲𝰰𚐥𜡥𜰬𭀯𜐶𚐻𪐭𛐻𬡥𬱴𫱲𩐨𩡩𫁬𤡥𨱴𚀰𛁓𚁪𚡪𚱴𚐪𜰹𛁪𛁪𛰲𞐩𚐩𬱡𭡥𚀩𛁳𨱡𫁥𚀡𬡯𭁡𭁥𚀨𜐫𪐫𪐥𜠩𚠮𝐲𜰶𚐬𪐥𜠪𜠭𜐩𛁲𫱴𨑴𩐨𪠽𪐯𜐲𯁣𫁩𬀨𫡥𭰠𤁡𭁨𜡄𚀧𫐰𘀰𭠵𜁨𜠹𙰩𚐩`.replace(/u../g,'')))

Dec 6 2020 4:02 AM UTC

}// 140/140

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

#snowflake designs

show FPS hide FPS share 2 remixes fullscreen

taupelink

remix of d/20654 by u/taupelink

function u(t) {

r=Math.random;for(i=k=214;i--;x.fillRect(k*X,k*Y,i/t,i/t))X=r(Y=r()*5)*9,h=k*S(Y%S(m=X/6%S(p=C(q=Y*S(X/3))*2)*2)),x.fillStyle=R(h*p,h*m,h*q)

Dec 2 2020 4:43 AM UTC

}// 140/140

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

d/20902

u/pavel

You can save 7 chars by doing f=i*t,X=f*f%9,Y=X*f%5 in these instead of Math.random. It seems random enough.
u/taupelink

Oh cool, thank you!! I like the way it changes the animation at the beginning too.

show FPS hide FPS share 1 remix fullscreen

pavel

function u(t) {

for(c.width|=i=8;--i;)for(w=j=3<<i-1;j--;x.fillRect(-!x.rotate(6.283/w*(j+i/(1+5**(4+i-t%3*5)))),-25*i,2,25))x.setTransform(3,0,0,3,960,540)

Nov 11 2020 8:56 PM UTC

}// 140/140

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

#beesandbombs

u/pavel

https://twitter.com/beesandbombs/status/1326…
u/pavel

#symmetry
u/donbright

nnnnnnice

show FPS hide FPS share fullscreen

flyink

function u(t) {

t||x.translate(960,540)
Z=1/C(t)
x.rotate(Z)
x.beginPath()
x.arc(0,0,t*50,0,Z)
x.stroke()

Nov 7 2020 5:45 PM UTC

}// 89/140

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

vinyl record

u/Xen

welcome to the dwitter family!

show FPS hide FPS share fullscreen

pavel

remix of d/10873 by u/yonatan

function u(t) {

for(i=0;Y=i>>5,Y<35;x[o?'clearRect':'fillRect'](0,!x.setTransform(4>>o,-o,2*o,2-o,j%T-Y%2<<6,Y*T+T*S(j*j+9*t)*S(t)**9),T=32,T))o=i%2,j=i++-o

Jun 16 2020 9:14 PM UTC

}// 140/140

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

#beesandbombs #uncompressed

u/BuRRak

I love it
u/aleamb

LOVE IT!!!

show FPS hide FPS share 3 remixes fullscreen

katkip

function u(t) {

t*=3;X=16*(S(t)**3);Y=13*C(t)-5*C(2*t)-2*C(3*t)-C(4*t),x.fillStyle=R(155+Y*10-X*4),x.fillRect(960+X*(20-(t/4)|0),500-Y*(20-(t/4)|0),29,29)

May 4 2020 10:13 AM UTC

}// 138/140

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

I love you <3 #heart #curve. Formula: X = 16*(S(t)**3); Y = 13*C(t)-5*C(2*t)-2*C(3*t)-C(4*t)

u/Xen

love it
u/lionleaf

I like how it flips after a while!
u/ersagun

looks like my first dweet: https://www.dwitter.net/d/10558

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 fullscreen

pavel

function u(t) {

for(i=1920;i--;x.fillRect(i&-T,i%T*T,T=32,T))x.fillStyle=`hsl(${T*t},99%,${u[i]=u[i]*.94+T/Math.hypot(i/T-T-C(3*t)*20,i%T-16-S(4*t)*9)||0}%`

Apr 2 2020 4:46 AM UTC

}// 140/140

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

Flare

Show more comments…
u/pavel

Inspired by https://twitter.com/ntsutae/status/124366720…
u/jylikangas

Lovely use of an array for the trail effect!
u/BriSeven

hypot?! WHAAAT how long has THAT been there?
u/katkip

this is actually easier than it looks
u/sigveseb

Looks very pretty :)
u/aleamb

amazing!
u/rodrigo.siqueira

It reminds me the light and movement of this Fluid Simulation https://paveldogreat.github.io/WebGL-Fluid-S…
u/Scaledish

hell, it looks better than the fluid simulation
u/joeytwiddle

#glow #worm

show FPS hide FPS share fullscreen

KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁫🐰𞱫🀱𩐳𞱦𪑬𫀨𩑬𫁩𬁳𩐨𪐪𝀫𤰨𭀪𞐫𪐩𚠳𛀨𤰨𪐪𪐩𚡔𚱔𚱴𚠨𪐥𝐫𜠩𚠵𞐩𙐲𩐳𛑪𚠹𛐹𛁷👫𚰫🰹𛑪𚠳𛑓𚁩𚱴𚐪𜰺𥀽𜑥𝐬𭰪𠰨𪐫𭀩𛰲𚱷𛀰𛀰𛀷𚐩𚑩👫🠾𜐬𪠽𪰥𜠬𨡥𩱩𫡐𨑴𪀨𩡩𫁬𤱴𮑬𩐽𤠨𭠽𞐹𚰱𝐵𚡪𚰡𪰪𜠹𛁶𛁶𛀮𜰩𚐻`.replace(/u../g,'')))

Mar 22 2020 7:01 PM UTC

}// 140/140

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

Rain on #Glass 🌧

dwitter.net | flyink (1230)