Dweets awesomed by u/Cloud

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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Cloud

function u(t) {

c.width=1920;for(i=0;i<200;i++){z=C(Math.abs(S((t+i)/2))+Math.PI)+Math.PI/2;x.fillStyle=R(0,0,0,z);x.fillRect(i*2*S(t+i)+960,i*5,20*z,20*z)}

Jan 6 2020 7:58 AM UTC

}// 140/140

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Rotation tree

u/Hepka

More like Spruce

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Odog8

remix of d/17079 by u/Odog8

function u(t) {

d=2*C(t)**2;c.width=900;for(b=0;b<70;b+=.02)l=[100*S(4.01*b/3+t)*S(b),b],l=[l[0]*C(l[1]),l[0]*S(l[1])],x.fillRect(l[0]+450,l[1]+230,d,d)

Jan 6 2020 2:13 AM UTC

}// 136/140

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fading le ribbon

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tylertoomey

function u(t) {

for(i=0;i<200;i++){
x.fillStyle=`hsl(${200+i/10},50%,${20+100/(200/i)}%,100%)`
x.fillRect(1000+C(t+i)*3*i*(C(t)*2),600+S(t+i)*i*4,10,10) 
}

Jan 5 2020 9:57 PM UTC

}// 139/140

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robotman_

function u(t) {

c.width^=0
for(j=1;j<5;j++)for(i=0;i<63;i++)x.fillStyle=`hsl(${i*5},99%,50%`,x.fillRect(960+S(S(t+j)+i/10)*400/j,540+C(j*t+i/10)*400/j,9,9)

Jan 5 2020 8:01 PM UTC

}// 139/140

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Crazy Rainbow Ring Rotations

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robotman_

function u(t) {

c.width^=0
for(i=0;i<314;i++)x.fillStyle=`hsl(${i},99%,50%`,x.fillRect(960+S(u=t-i/50)*(a=400+50*S(t*3+i)),540+C(u)*a,15,15)

Jan 5 2020 7:30 PM UTC

}// 124/140

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Circular Spiral (I don't know what happened)

u/pavel

http://mathworld.wolfram.com/Torus.html
u/pavel

Look at the parametric equations

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pavel

function u(t) {

for(c.width=640,i=8;i--;x.stroke())x.beginPath(r=150*2/3*(i>1)),x.arc(320+r*C(a=Math.PI/3*i+t),180+r*S(a),150*(i?1/3:1),0,7)

Jan 4 2020 9:07 PM UTC

}// 124/140

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d/17063 #explanation

u/pavel

If you take every point on this picture, turn it into z=x+i*y and feed it through (sqrt(3)+z)/(1+sqrt(3)*z) then decode the resulting complex number as (x', y') and put a point there, you will get d/17063.
u/pavel

Of course you can't take infinitely many points so you will get a pixelated version. To get a proper version you need to solve the equation for the new, mapped, circle given the old circle so that you can use x.arc..

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Jezza

remix of d/17065 by u/Jezza

function u(t) {

c.width|=0
for(i=0;i<t*9;i+=Math.PI/t**.7) {
 x.beginPath();
 x.ellipse(960+C(i)*i*4,540+S(i)*i*4,i**0.5,i**0.5,0,0,2*Math.PI)
 x.fill();
}

Jan 4 2020 2:33 AM UTC

}// 140/140

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pavel

function u(t) {

for(c.width=640,i=8;i--;x.stroke())x.beginPath(R=3+12**.5*C(t+=22/21)),j=i<2,x.arc(320+150*(2*!i-j),180+260*S(t)*!j/R,130/(j||R*R)**.5,0,7)

Jan 4 2020 12:23 AM UTC

}// 139/140

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Eight kissing circles

Show more comments…
u/pavel

These are the circles e^is, 1/3*e^is, 1/3*e^is + 2/3*e^i(n*pi/3+t) for n=0..5 transformed via the conformal map (3^.5+z)/(1+3^.5*z)
u/yonatan

Fascinating, but incomprehensible :)
u/yonatan

my best guess: z in the map is coords as a complex number, i is sqrt(-1), e is euler's const? no idea what's s
u/pavel

You got it. s is just a parameter, a real number. If you plot e^is in the complex plane you get a circle (https://en.wikipedia.org/wiki/Euler%27s_form…). Then that map magically moves and resizes things but keeps circles as circles.
u/pavel

This d/17068 is what the circles look like before the mapping. The mapping moves the inner one sideways, outside of the outer circle, and resizes it to be the same size, meanwhile the moving circles keep touching.
u/pavel

Check out https://jsfiddle.net/umL3t1he/9/ on desktop
u/katkip

#apolloniangasket

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robbyg

remix of d/17061 by u/robbyg

function u(t) {

for(c.width|=j=0;j<10;x.fillStyle=R(++j*30))for(i=540;i--;)x.fillRect(Math.acos(C(t+i*.9*j/1000))*520,i*2,i/2.5,2)

Jan 3 2020 7:40 PM UTC

}// 114/140

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u/katkip

fancy

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pavel

function u(t) {

f=n=>n&&C(t*f(n-1))
t?X=(333+X+C(a+=f(9)/15))%333:X=Y=a=98
Y=(180+Y+S(a))%180
for(i=2;i--;x.fillRect(X*6-d*S(a),Y*6+d*C(a),8,8))d=i%2?24:-24

Jan 3 2020 5:16 AM UTC

}// 140/140

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Invisible car

u/andrea270872

nice. could it work to create a zen-garden look?

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