One for loop to rule them all... with a… by tomxor

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

Please log in (or register) to post a dweet (copy-paste the code somewhere safe to save it meanwhile)


    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.

show FPS hide FPS share fullscreen

tomxor

remix of d/20689 by u/yonatan

function u(t) {

for(c.width=64,i=2e4;Z=--i>>9;T=k^64?T+S(Z+C*k/9+9/Z*t*k)/k:x.fillRect(C=i/8&63,T*9-T*Z/3,1,l=Z*32-Z*Z,x.fillStyle=R(l,l+Z,l/.8))|3)k=1<<i%8

Nov 19 2020 11:12 PM UTC

}// 140/140

Please log in (or register) to post as a new dweet (copy-paste code somewhere safe to save it meanwhile).

One for loop to rule them all... with a moderate chance of rain

Show more comments…
u/tomxor

This was a tough golf! thanks for the challenge and awesome dweet yonatan :)
u/DataMeta

I like this golfed rendition! :]
u/yonatan

i think i like this better than the original :)
u/yonatan

what's the deal with the k^64 tho? seems like it'd spend 64 iterations building the fbm in T and then 64 more doing fillRects??
u/yonatan

k&63 I'd understand...
u/yonatan

oh right, k isn't the loop counter
u/yonatan

-1 char with i&7: for(c.width=64,i=2e4;Z=--i>>9;T=i&7?T+S(Z+C*k/9+9/Z*t*k)/k:x.fillRect(C=i/8&63,T*9-T*Z/3,1,l=Z*32-Z*Z,x.fillStyle=R(l,l+Z,l/.8))|3)k=1<<i%8
u/danny@hille.dk

Use the saved char to boost performance with i=15e3
u/danny@hille.dk

This is a fabulous golf👍
u/danny@hille.dk

excellent work u/tomxor
u/tomxor

Thanks Danny :)


      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)

dwitter.net