PSystem ps;
Arcball arcball;
Surface bone;

class NoShowParticle extends Particle {
  public NoShowParticle() {
  }
  
  void draw() { // Do nothing in draw
  }
}

class RightParticle extends Particle {
  float startX;
  public RightParticle() {
    fix();
  }
  
  void draw() {
    if (age == 0) {
      startX = pos[0] - 300;
    }
  
    pos[0] = startX + 400 * sin(age/150.0 + 3*PI/4);
    age++;
  }
}

class RectParticle extends Particle {
  
  public RectParticle() {
    Magnet m = ps.addMagnet(this);
    m.strength = -50;
  }

  void draw() {
    if (fixed()) {
      fill(#FF0000);
    }
    else {
      fill(200);
    }
    super.draw();
  }
}

void setup() {
  size(500,500);
  arcball = (Arcball)loadPlugin("Arcball");
  ps = (PSystem)loadPlugin("PSystem");
  
  ps.setGravity(0);
  bone = ps.loadSurface("bone.obj");
  bone.setTexture("rods.jpg");
  bone.scale(10);
  
  bone.applyParticles("Layer_01", new RightParticle());
  bone.applyParticles("Layer_02", new NoShowParticle());
  bone.applyParticles("Layer_03", new NoShowParticle());
  
  bone.attachParticleToCentroid("Layer_01", new RectParticle());
  
  //bone.addSpringsToOriginalShape("Layer_01");
  bone.addSpringsToOriginalShape("Layer_02");
  bone.addSpringsToOriginalShape("Layer_03");
}


void loop() {
  background(100, 200, 50);
  translate(width/2, height/2);
  arcball.run();
  
  fill(200, 200, 200, 255);
  stroke(100, 100, 100, 100);
  bone.draw();
  ps.draw();
}