class Particle {
  
  float[] distances = new float[particles.length];
    
  PVector location = new PVector(0,0,0);
  PVector velocity = new PVector(0,0,0);
  PVector acceleration = new PVector(0,0,0);
  
  color pcolor;
  float total;
    float avg;
  
  float radius = 20;
  
  
  Particle(float _x, float _y, float _z) {
    location.x = _x;
    location.y = _y;
    location.z = _z;
    
    velocity = new PVector(random(-2,2),random(-2,2),random(-2,2));
    
  }
  
  void update() {
    
    float d = location.dist(center);
    if (d > 400) {
      acceleration = PVector.sub(center, location);
//      acceleration.add(PVector.random3D());
      acceleration.normalize();
      acceleration.mult(0.2);
      
      velocity.normalize();
      velocity.mult(.1);

    }
    
    location.add(velocity);
    velocity.add(acceleration);
    
//    velocity.mult(friction);
//    acceleration.mult(friction);
  }
  
  void show() {
    total = 0;
    avg = 0;
    
    for (int i = 0; i < particles.length; i++) {
      distances[i] = particles[i].location.dist(location);
      for( int j = 0; j < distances.length; j++ ) {
        total += distances[j];
      }
      
      avg = total / distances.length;
      println(avg);
      
      if (avg > 1000) {
        pcolor = color(255,0,0);
      }
      else pcolor = color(255);
    }
    
    
    pushMatrix();
    translate(location.x, location.y, location.z);
    fill(pcolor);
    noStroke();
    sphere(radius);
    popMatrix();
  }
}