First time using setTransform, seems us… by AnnanFay

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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AnnanFay

remix of d/6784 by u/silver_bear

function u(t) {

l=c.width|=a=12
with(x)for(;a-=3;fillRect(-9,6,18,-a*50))setTransform(r=C(θ=(0|Date().slice(13+a,15+a))*.524/(a>3?5:1)),n=S(θ),-n,r,l/2,l/4)

Feb 8 2018 4:06 PM UTC

}// 140/140

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First time using setTransform, seems useful. .524/(a>3?5:1) is shortform for Math.PI * 2 / (a>3?60:24).

u/AnnanFay

Hmm, just noticed a few things. Would be smaller without with(x) since there's only two method calls. Also we don't need the 0| after the slice because the division will cast for us. So that's 7 characters.
u/akm

You can also remove some parentheses and the l variable: for(c.width|=a=12;a-=3;x.fillRect(-9,6,18,-a*50))x.setTransform(r=C(θ=Date().slice(13+a,15+a)*.524/(a>3?5:1)),n=S(θ),-n,r,960,540)
u/silver_bear

Impressive that you managed to fit both seconds and real hands. Seems I lack a bit of syntax creativity. Nicely done! :)
u/iverjo

#clock


      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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