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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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pavel

remix of d/11110 by u/ellisk1

function u(t) {

for(i=c.width|=c.style.filter="blur(.5vh)invert(1";i--;x.fillRect(1e3+500*S(a=q+t/9),650+i/3-210*Math.abs(S(q*3.75)),w=12+9*C(a),w))q=t-i/99

Feb 13 2020 8:19 AM UTC

}// 140/140

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Bouncer #beesandbombs #filter

u/Xen

sexy
u/Qwitter

perfect

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pavel

remix of d/17562 by u/KilledByAPixel

function u(t) {

c.style.filter="blur(1vh)sepia()invert(";for(c.width=198,k=777;j=--k>>5;x.arc(99,56,r*r,a=(j+k%32)%30*.21+S(r)/2,a))r=j+k%2+t%2-2;x.stroke()

Feb 12 2020 7:37 AM UTC

}// 140/140

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#uncompressed

u/KilledByAPixel

i knew you could do it 😉

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pavel

function u(t) {

for(c.width|=j=21,x.scale(5,5),x.lineJoin="round";j--;)for(i=26;i--;)x.arc(192,108,1.3**(r=j+i%2+t%2),a=(i+j)%24/3.8197+C(r)/2,a);x.stroke()

Feb 11 2020 7:29 AM UTC

}// 140/140

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Creeping

u/katkip

kind #tunnel
u/Yogeshp3

source of mathematics?
u/cantelope

source: pavel
u/pavel

I was inspired by https://twitter.com/beesandbombs/status/1221… I wanted to see if I could draw it with one stroke. Then I just started playing around. +C(r)/2 does most of the work here, if you delete it you can see the reference shape.
u/pavel

%24 is only there to avoid a bug in Safari from angle being too big on arc. /3.8197 is short for *Math.PI/12

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pavel

function u(t) {

for(i=c.width|=p=1.047,x.scale(9,9);i--;x.lineTo(47+f(C),f(S)))f=g=>60+56*g(a=~~t*p+i/300)-(i<3)*32*(g(b=2*a-t*p+p/2)-g(2*p*i+b));x.stroke()

Feb 11 2020 6:37 AM UTC

}// 140/140

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Walking around

u/pavel

One of those things that's difficult to get into 140 chars but doesn't look so impressive hah.
u/pavel

Note that this is done with one stroke. The drawing starts and ends from the point that touches the circle, which changes throughout the animation.
u/pavel

You can see it if you change i/300 to i/310

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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!

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pavel

function u(t) {

for(i=36;--i;x.fillRect(m?Math.abs(9*t%53-26)<<6:i*60-210,m*i*327,60<<2*m,m?99:2e3))m=i<3,x.fillStyle=m?i%2?'#ff0':'#00a':i%2&t/4?R():'#eee'

Feb 9 2020 1:50 AM UTC

}// 140/140

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Stepping feet #illusion

u/katkip

#opticalillusion
u/veubeke

@pavel Sorry, I didn’t see your dweet. I deleted mine and will do a better job searching next time.
u/pavel

I was just cross-posting mine as they were on the same topic without a clear keyword. You should have kept yours, it was clearly different.

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pavel

function u(t) {

with(x){for(i=c.width|=0,q=1-t%2,fillStyle='#09f',scale(5,5);a=--i>>5;rect(180+24*(a*q-9*q+b),24*(a-b*q)-119,22,22))b=i%32-9;fill(stroke())}

Jan 25 2020 8:17 PM UTC

}// 140/140

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Windmill #tiling

u/pavel

Inspired by the Mathologer video https://www.youtube.com/watch?v=DjI1NICfjOk

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pavel

remix of d/17175 by u/pavel

function u(t) {

for(i=c.width|=p=355/226;i--;x[i&5?'arc':'moveTo'](960,600-50*z,2e3/z,b=((i>>3)*2+S(i*p)-z)/8%4*p,b))z=2.5-2*t%1+(i>>7)+C(i*p)/2;x.fill()

Jan 17 2020 2:47 AM UTC

}// 137/140

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u/aleamb

amazing!
u/tomxor

ooh, toroidal chess?
u/katkip

#tunnel

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pavel

function u(t) {

for(x.beginPath([X,Y=X,r=X]=t?d.shift():d=[666]),i=4;i--;i&&d.push([X+p/2,Y-q/2,r/2]))p=r*S(b=i*2.094),q=r*C(b),x.lineTo(X+p,Y-q);x.stroke()

Jan 17 2020 3:48 AM UTC

}// 140/140

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Incremental #sierpinski

u/katkip

#fractal
u/Cloud

Wow! Nice fractal!

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pavel

function u(t) {

X=450
c.width|=f=(r,a,o)=>r>9?f(r/=2,a-o,-o)+f(r,a,o)+f(r,a+o,-o):(t-=.02)>0&&x.lineTo(X+=r*C(a*=355/339),Y+=r*S(a))
f(Y=1e3,0,1)
x.stroke()

Jan 17 2020 3:27 AM UTC

}// 140/140

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One stroke #sierpinski

u/tylertoomey

Wow, this is phenomenal!
u/katkip

#curve #sfcurve

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