complex #emoji give interesting results… by f8f82804

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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f8f82804

remix of d/10293 by u/f8f82804

function u(t) {

with(x)for(i=c.width=320;i--;fillText('👹',155*(i?1+S(i^3*t):.4),90*(i?1+C(t-i):1.8)))i||(font='5cm a',globalCompositeOperation='xor')

Oct 10 2018 5:07 PM UTC

}// 133/140

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complex #emoji give interesting results with some #composite operations, at least in Firefox

u/f8f82804

It looks like each shape is drawn in a separate pass, which causes strange results! The only alternative would be to render the glyph to an off-screen canvas and then paint the image with appropriate compositing. This is hard to do in 140 chars!
u/f8f82804

update: on Firefox Android, the font rendering behavior is different


      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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