Blinkenlights by joeytwiddle

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

joeytwiddle

function u(t) {

R=()=>(97*t++*t%1)*16<<7
for(i=2;i--;x.fill())x.beginPath(x.fillStyle=`hsla(${R()},99%,${50*!i}%,${i?.03:.5})`)|x.arc(R(),R(),i?3e3:40,0,7)

Jan 17 2019 6:05 AM UTC

}// 139/140

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

Blinkenlights

u/joeytwiddle

Inspired by (but barely resembling) the Arabesque screensaver on macOS
u/joeytwiddle

For brighter lights, try .8 instead of .5
u/joeytwiddle

Whatever number you choose, one lights always blinks regularly. For 97 it's the orange light in the lower right.
u/joeytwiddle

For 321 there is a yellow light giving a double pulse


      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