Top 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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pavel

remix of d/16356 by u/KilledByAPixel

function u(t) {

for(c.width=i=99;a=i-->>3;x.ellipse(50,9+a%2*39,29,6,0,q=(i-a+t)%4*11/7,q))x.stroke()

Oct 28 2019 8:41 PM UTC

}// 85/140

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85 byte #cube

u/tomxor

MOoar smaller !! :P
u/KilledByAPixel

Amazing!

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pavel

function u(t) {

for(c.width|=p=710/339,x.scale(i=9,9);i--;x.arc(107+q*C(a=i%2*3+~~T*p),60+q*S(a),60-q,a-=p,a))T=t++/2%3,q=T%1*60
x.stroke()

Feb 7 2019 8:08 PM UTC

}// 123/140

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u/katkip

Nice!

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pavel

function u(t) {

eval(unescape(escape`琿〺愽笱㈳㐲㨱紻楦⡦牡浥┳〽㴰☦晲慭攼㌰⨳㌩笠景爨挮睩摴桼㵢㵻紬焽㉥㐻椽焭ⴾ㸷㭸⹦楬汒散琨㄰⩩ⰱ〪樬㄰ⱡ孱崪㄰⤩景爨樽焥ㄲ㠬欽㤻欭ⴻ⥢孱嵞㵫ⴴ㽡嬨椫欥㌭ㄩ⨱㈸⭪⬨欯㍼〩ⴱ崺〻愽扽`.replace(/u(..)/g,"$1%")))

Dec 11 2018 8:27 AM UTC

}// 137/140

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Fredkin Replicator

u/pavel

Cellular automaton. A cell turns on if it has an odd number of on neighbors and turns off otherwise.
u/pavel

First 32 generations
u/pavel

(starting with one on cell in the middle)
u/lucio

Awesome Numberphile contribution :-)

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pavel

function u(t) {

for(c.width|=i=64,x.scale(16,16);i--;)x.fillRect(X=i%8*8+30,Y=i&-8,X+Y&8,i+64-"@JDN_nu{q`Q".charCodeAt(t%12|0)?8:x.fillText('♞',X-1,Y+8))

Dec 6 2018 7:41 AM UTC

}// 138/140

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Knight's Tour v0 #chess

u/donbright

nice work

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pavel

function u(t) {

A=.8+S(t)*.77;Y=1e3;f=(r,a)=>r<9**A?x.lineTo(X+=r*C(a*A),Y+=r*S(a*A)):f(r/=2+2*C(A),a)+f(r,a-1)+f(r,a+1)+f(r,a);f(c.width|=X=0,0);x.stroke()

Nov 7 2018 5:10 AM UTC

}// 140/140

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Koch curve with varying angles

u/aleamb

love it!
u/Xen

#koch

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pavel

remix of d/24056 by u/KilledByAPixel

function u(t) {

for(i=u=~u*7&511;w=i--/4;)x.fillRect((t||S(i))*2e3-u*T%w,T=640+(i&5?i-u:u-i),t?w:u,t?2:i/u)

Oct 11 2021 5:55 PM UTC

}// 91/140

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u/pavel

for(i=u=~u*697&475;w=i--/4;)x.fillRect((t||S(i))*2e3-u*T%w,T=640+(i&5?i-u:u-i),t?w:u,t?2:i/u) has the parabola shape but is 92 and a little too symmetric.
u/pavel

Err, I meant for(i=u=~u*81&493;w=i--/4;)x.fillRect((t||S(i))*3e3-u*T%w,T=640+(i&5?i-u:u-i),t?w:u,t?2:i/u)

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pavel

remix of d/21114 by u/magna

function u(t) {

c.width=512
for(let i=23e3;i--;)i/1e3-12>T(T(S(i%80/13)*S(i/1e3-4*t)))&&x.fillRect(i%80,i/80,1,1)
for(i=6;i--;)x.drawImage(c,80,0)

Jan 3 2021 12:39 AM UTC

}// 130/140

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4x resolution from leveraging periodicity

u/magna

Smart! And a lot more beautiful! :)

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pavel

function u(t) {

for(i=c.width|=m=[h=1080];i--;)m[i]=i**3%h
m.sort((a,b)=>(t-=1/h)>0&&a-b).map((n,i)=>x.fillRect(i,h-n,1,n,x.fillStyle=`hsl(${n/9},69%,50%`))

Dec 22 2020 11:33 PM UTC

}// 140/140

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Visualizing Array.sort

u/pavel

This probably works and is probably merge #sort :)
u/ciaccodavide

Nice!

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pavel

function u(t) {

for(let j=3,X,r,f=x=>S(16*x)**420;j--;)for(let Y=t/3+j/540-1,i=2e3;i--;x.fillRect(i,t*180+j,2*r,f(X/r)+f(Y/r)))X=i/540-16/9,r=X*X+Y*Y

Apr 23 2020 5:31 AM UTC

}// 133/140

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Conformal mapping of a grid (1/z), all intersections are at right angles

u/pavel

Set r=1 to see the grid.

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pavel

function u(t) {

for(x.globalAlpha=.01,x.fillRect(p=2.1,q=C(t%p+p),i=2e3,i);i--;x.clearRect(960+f(C),640+f(S),9,9))f=g=>400*(i?-q:.5/q)*g(t+1.57)+i*S(i)*g(t)

Feb 9 2020 8:25 PM UTC

}// 140/140

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Geometric Algebra - Point on a triangle and its dual line

u/pavel

Inspired by https://youtu.be/tX4H_ctggYo?t=2362
u/pavel

Yikes this lags on my phone bad
u/Qwitter

Legendred!

dwitter.net | pavel (7290)