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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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donbright

remix of d/1755 by u/SpecialAgent

function u(t) {

n=frame
q=n%2?400:289.2
d=n%2?2*t:2*t/.61518
X=960+q*C(d),Y=540+q*S(d)
n%4?x.moveTo(X,Y):x.lineTo(X,Y)
x.stroke()
x.fillRect(X,Y,9,9)

Mar 3 2017 2:36 AM UTC

}// 133/140

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This shows the pattern traced by a line directly between the Earth and Venus as they orbit the sun. This pattern is pretty ancient, for example discussed in the book Quadrivum about the old academic relationships between art and science. This type of pattern may be helpful to appreciate the concept of Orbital Resonance in a planetary system.

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u/donbright

thx to https://nssdc.gsfc.nasa.gov/planetary/factsh… for the data
u/sfz

Fascinating
u/donbright

inspired by @SpecialAgent obvs!
u/SpecialAgent

This pattern is very pleasing to the eye, very nicely done!
u/sigveseb

This space stuff is nice!
u/Lazy1337

#cardioid
u/Lazy1337

#math
u/donbright

#venus #space #orbits

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SpringStingray

remix of d/4972 by u/SpringStingray

function u(t) {

c.width^=i=0,a=480,b=6.28/a;while(i++<=a)d=i*b,k=d*t%a,x.moveTo(2*a+a*C(d),a+a*S(d)),x.lineTo(2*a+a*C(k),a+a*S(k));x.stroke()

Dec 31 2017 3:19 PM UTC

}// 125/140

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u/infomiho

love it
u/Lazy1337

#cardioid

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katkip

function u(t) {

if(!t)q=0;
for(j=99;j--;){Z=[q,q*2,q*3,q*4,q*5,q*6,]
X=960,Y=540
for(i of Z){X+=C(i*3.14*2)*99,Y+=S(i*3.14*2)*99}x.fillRect(X,Y,9,9),q++}

Sep 11 2020 2:13 PM UTC

}// 137/140

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#cardioid

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katkip

function u(t) {

t||(X=Y=1);X+=S(t)+S(t*2);Y+=C(t)+C(t*2);x.fillRect(560+X*5,540+Y*5,9,9);

Mar 6 2019 1:13 PM UTC

}// 73/140

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#cardioid #math

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