Double spiral galaxy #spiral #galaxy by rodrigo.siqueira

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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rodrigo.siqueira

remix of d/31859 by u/anilalur

function u(t) {

c.style.filter=`sepia(.6)invert(`
t?x.drawImage(c,~x.fillText(88,~x.scale(s=1-C(1/++t)/25,s),0),~x.rotate(3)):x.translate(980,540)

May 30 2024 10:27 PM UTC

}// 130/140

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Double spiral galaxy #spiral #galaxy

Show more comments…
u/metamero

lindo!!
u/aaaaaz

why tild before x ? ~x ?
u/tomxor

all of the x.method() calls return undefined, and bitwise operators coerce any non-number into 0, so ~x.foo() = ~undefined = ~0 = -1. The purpose of this - all of those method calls are defined as parameters to other methods, not for their return value, but to save 1 char. i.e x.foo(0,0);x.bar()=18 x.foo(0,~x.bar())=17, that the parameter is -1 instead of 0 doesn't matter too much in these cases.
u/cantelope

u/rodrigo.siqueira https://i.ibb.co/kGZrsF5/ezgif-3-2716f9f1aa.…
u/rodrigo.siqueira

Wow u/cantelope, how was this made?
u/lewdev

u/tomxor that's awesome. Thanks for explaining that!


      u(t) is called 60 times per second.
      t: elapsed time in seconds.
      c: A 1920x1080 canvas.
      x: A 2D context for that canvas.
      S: Math.sin
      C: Math.cos
      T: Math.tan
      R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)

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