Urban Pollution by magna

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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magna

function u(t) {

e=1e4;(i=new Image()).src=c.toDataURL('image/jpeg').replace(eval(`/(.{${t%e+e}})./`),'$1a');x.globalAlpha=.8;x.drawImage(i,0,0);

Feb 25 2017 4:46 AM UTC

}// 128/140

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Urban Pollution

u/SpecialAgent

This is a very nice effect, my browser ran out of memory after a short while though. ;)
u/iverjo

Haven't seen this technique before. How does it work?
u/magna

@iverjo: I keep exporting the canvas as base-64 JPEG and randomly screwing up with the data at a particular range that gives this effect while keeping the JPEG intact. Prior art: https://github.com/snorpey/jpg-glitch


      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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