d/7149 by dwardu

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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dwardu

function u(t) {

navigator.getBattery().then(b=>{c.width=99
x[m='fillRect'](89,18,4,9)
ℓ=b.level
x[m](9,9,80*(b.charging?t%ℓ:ℓ),27)
x.strokeRect(9,9,80,27)})

Mar 3 2018 11:23 PM UTC

}// 140/140

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u/AnnanFay

Laptop only?
u/dwardu

Works on mobile/laptop, but on desktop appears as “100% & charging.” I would have liked to tackle this by modifying the expression to “ℓ<1&&b.charging?t%ℓ:ℓ”, but I couldn’t find a way to reduce a further 5 characters!
u/dwardu

Could be written as “ℓ<1&”, so 4 characters really.
u/AnnanFay

Hmm, on desktop-windows-firefox I'm just getting "navigator.getBattery is not a function"
u/AnnanFay

Ah, this would explain it: "From Firefox 52 onwards, the Battery Status API is only available in chrome/privileged code."
u/dwardu

Yes, after your comment I did some research and made this discovery too.


      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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