class Neuron {

  float x, y, r, rx, ry;
  color c;
  
  Neuron() {
    x = random(512);
    y = random(384);
    r = random(15, 40);
    c = color(random(100), random(100), random(100));
  }
  
  void mover () {
    float stepSize = 1;
    float angle = random(TWO_PI);
    x += stepSize * cos (angle);
    y += stepSize * sin (angle);
  }
  
  void pintar () {
    fill(c);
    ellipse(x, y, rx, ry);
  }
  
  void vibrar() {
      float u1 = random(1.0);
      float u2 = random(1.0);
        
      rx = r + 2.0 * sqrt(-2.0 * log(u1)) * cos(TWO_PI * u2);
      ry = r + 2.0 * sqrt(-2.0 * log(u1)) * sin(TWO_PI * u2);
  }
}