#castle #fire 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

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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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tomxor

remix of d/19550 by u/tomxor

function u(t) {

for(w=c.width&=i=8320;i--;u[i]=t?p<w?r%.7*(p+u[i-w]+u[i-w+1])&w-1:p:(~r-14&16)<<r*.6)p=u[i],x.fillRect(i%w,Y=68-i/w,1,p**.4/7-Y/w),r=i*t^i&Y

Aug 19 2020 11:53 PM UTC

}// 140/140

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#castle #fire

Show more comments…
u/tomxor

Took some hints from d/11257 for the fire, but made it more minimal. Thanks to u/KilledByAPixel for the c.width&= trick that allowed to fit some nicer gradient and fire effect.
u/jellyedwards

That's incredible! How does the c.width&= trick work?
u/KilledByAPixel

c.width is 1920, 1920 & 8320 is 128, this way you don't need to write 128 for the width
u/tomxor

This is a bit verbose, but I found it easier to understand in binary: 1920 == 0b0000011110000000; 8320 == (8192 | 128); 8320 == 0b0010000010000000; (1920 & 8320) == 0b0000000010000000. In other words i needs to be roughly 8e3 to fill the screen, 8192 (the 14th bit) is not in 1920 so we can use it without affecting w. w needs to be quite small, 128 (the 8th bit) is the lowest bit available in 1920, which is why it's produced with AND.
u/magna

This is nuts.
u/magna

Please do a write-up on this Dweet.
u/jellyedwards

Thanks for the explanation
u/aleamb

absolutly amazing
u/DataMeta

+1 to magna's request
u/joeytwiddle

Pretty great!
u/13thptr

What u/magna said.
u/Xen

Sexy business right here
u/tomxor

Ok why not, I will do writeup, but need to make blog first :P I will post here and discord when done.


      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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