Processing script for bifurcation of king dream fractal

float a, b, c, d, x, y, xp, yp;
PFont f;

void setup() {
  size(1500, 1000);
  f = createFont("Arial", 16, true);
  a = 0.59;
  b = 3;
  c = -1.4;
  d = 1.2;
  xp = random(-2, 2);
  yp = random(-2, 2);
  background(0);
  fill(255, 0, 0);
  noStroke();
  textFont(f, 20);
  text("a = " + str(a) + "\nb = " + str(b) + "\nc = " + str(c) + "\nd = " + str(d), 10, 30);
}

void draw() {
  //background(0);
  for (int j = 0; j < 100; j++) {
  xp = random(-2, 2);
  yp = random(-2, 2);
  for (int i = 0; i < 100000; i++) {
  x = sin(yp * b) - c * sin(xp * b);
  y = sin(xp * a) + d * sin(yp * a);
  if (i > 5000) {set(int(map(a, 0.59, 0.75, 0, 1500)), int(map(y, -3, 3, 1000, 0)), color(255));}
  xp = x;
  yp = y;
  }
  a += 0.00001;
  println(a);
  }
}