de Jong Attractor

function setup() {

  createCanvas(w=720, h=w);

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  colorMode(HSB);

  background(98);

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  push();

  strokeWeight(1);

  stroke(10, 0.25);

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  translate(w/2, h/2);

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  let a = -1.4;

  let b = 1.4;

  let c = 1.7;

  let d = -1.4;

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  let draw_scale = 150;

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  let N = 100000;

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  let x = random(-1,1);

  let y = random(-1,1);

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    for(let i=0;i<N;i++){

      let dx = sin(y*a) + cos(x*b);

      let dy = sin(x*c) + cos(y*d);

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      point(draw_scale*dx, draw_scale*dy);

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      x = dx;

      y = dy;

    }

  pop();

}

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//save PNG

function keyPressed() {

  let name = "img_" + month() + day() + hour() + minute() + second();

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  save(name + ".png");

}