Hot dweets by u/pavel

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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Current theme challenge: #Opposites

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pavel

remix of d/11200 by u/anotherkitten

function u(t) {

a=frame%29/9
t?a?x.moveTo(2e3,540):x[j=i]=i+=i<++s|x[i-s]?s:-s:j=i=s=0
o=(f=i>j)==s%2
x.arc(i+j<<2,540,4*s,w=f*22/7,o?w-a:w+a,o)
x.stroke()

Nov 30 2018 9:52 PM UTC

}// 139/140

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Recamán's sequence (try fullscreen)

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pavel

remix of d/11192 by u/pavel

function u(t) {

for(k=c.width|=w=120;i=k-->>6;x.rect(--j*w+o(t),(i-2)*w+o(t-1.6),s=k%2?j+i&1&&w:60,s))j=k/2&31,o=n=>k%2*w/(2+1e9**C(n))
x.fill('evenodd')

Nov 30 2018 2:37 AM UTC

}// 137/140

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pavel

function u(t) {

for(c.width|=i=5,x.scale(9,9);i--;)x.stroke(new Path2D(`m${107+i*S(t)},${90+i},`+'40004080884826224048884808004062'.split``.map(n=>5*n-20)))

Nov 29 2018 9:05 AM UTC

}// 140/140

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Cool S

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u/lionleaf

#S
u/magna

Just 2 chars shorter than '40004080884826224048884808004062': btoa("ãM4ãO4óÎ<Û¶ãN<óÎ<ÓÍ4ãN¶")
u/magna

(Or even shorter as a template literal
u/magna

(Or even shorter as a template literal
u/magna

(Or even shorter as a template literal
u/magna

(Or even shorter as a template literal
u/magna

(Or even shorter as a template literal
u/magna

OMFG. I was holding a sandwich and typing with the same hand. And that happened ^
u/13thptr

#path2d

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pavel

function u(t) {

for(k=c.width|=w=120;k--;x.rect(j*w+o(t),i*w+o(t-1.6),s=k%2?60:j+i&1&&w,s))i=k>>6,j=k/2&31,o=n=>k%2*w/(2+9e9**C(n-k/1e3))
x.fill('evenodd')

Nov 28 2018 8:17 PM UTC

}// 139/140

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Chessboard Stairs #beesandbombs (simplified)

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u/jylikangas

Another very clever implementation!
u/katkip

This game me a headache
u/katkip

This game me a headache. Nice
u/metamero

great dwitter! [as always] ... why this is so much slower on phone (android)?
u/metamero

great dwitter! [as always] ... why this is so much slower on phone (android)?
u/pavel

It is a bug in the website. I'll see if I can fix it.

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pavel

function u(t) {

with(x)for(c.width|=k=320,scale(9,9);--k;arc(107,60,16*(k>>5)+16/(1+1e5**(.5+k%2-t%2)),a=(t/2-k)%11*.571,a))k%2&&beginPath(stroke())

Nov 26 2018 7:23 PM UTC

}// 132/140

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Walking Spiral #beesandbombs

u/pavel

Using scale(9,9) to get thick lines and shave some digits from coordinate numbers (e.g. 60 vs 540 for height)
u/pavel

x.arc(X,Y,r,a,a) = x.lineTo(X+r*C(a),Y+r*S(a))
u/katkip

Duuude
u/katkip

Awesomeee

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pavel

function u(t) {

for(i=c.width|=0;Y=i-->>6;x.fill(x.arc(((i&62)-Y)*48-o*C(A=~~t/.9549),(Y-2)*83-o*S(A),30,A,A-3,i%2)))x.beginPath(o=i%2*96/(1+1e9**(.5-t%1)))

Nov 25 2018 5:45 AM UTC

}// 140/140

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Sliced Dots #beesandbombs

u/pavel

Golfed 3 loops into one. Lowest bit of i determines half-circle, next 5 bits determine X and the rest determine Y
u/pavel

i&62 = (i>>1)%32*2 = X*2
u/jylikangas

There's a lot of really clever tricks in your dweets. Keep them coming! :)
u/katkip

wow

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pavel

remix of d/9830 by u/joeytwiddle

function u(t) {

for(c.width|=j=22,t%=2;--j;)for(i=8;i--;x.arc(960,540,i&&j>2*p&&70*(j-2*p),a=(i+p)*355/339,a))p=1/(1+2**(j+6-16*t));x.fill('evenodd')

Nov 23 2018 3:16 AM UTC

}// 133/140

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u/joeytwiddle

Golfed with plenty to spare. Fantastic!
u/sigveseb

Oh my
u/iverjo

Yes!
u/pavel

#uncompressed

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pavel

function u(t) {

with(x)for(j=9;--j;)for(i=2<<j,f=6.28/i;i--;fill())for(beginPath(k=2);k--;fillStyle=i%2?'#fff':R())arc(960,540,k*190*j**.5,a=(i+t%2)*f,a+f)

Nov 23 2018 4:55 AM UTC

}// 139/140

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Black and white spinners #beesandbombs

u/katkip

1.5 dimension fidget spinner
u/BackendForth

Looks like a rotary encoder.

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pavel

function u(t) {

for(c.width=i=300;j=--i>>1;x.fillText('⚫⚪'[k],29*j-8*s,84+(k*25-1)*Math.tanh(5*S(a))))k=i&1^C(a=j/3-2*t)>0,x.font=(s=1+C(k*a/2)**2)*12+'px"'

Nov 23 2018 8:40 AM UTC

}// 140/140

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Twister #beesandbombs

u/pavel

Getting the white to go over the front but behind the back is so hard! Had to use emojis to save bytes but its janky on some devices.

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pavel

remix of d/11116 by u/vistefan

function u(t) {

t?0:D=[0,-5,0,d=5,w=X=Y=150]
for(i=w;i--;x.fillRect(X,Y,5,5))x.fillStyle=R(b=w-x.getImageData(X+=D[d&3],Y+=D[++d&3],1,1).data[0],b,d+=b&&2)

Nov 22 2018 7:01 AM UTC

}// 139/140

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Fast Langton's ant #waitforit

u/katkip

Wow thats cool
u/pavel

#ant #automata

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