class ShadowBit
{
  int m_UniqueID;
  Vector2D m_Position;
  Vector2D m_Forces;
  float m_Width;
  float m_Height;
  float m_HalfWidth;
  float m_HalfHeight;
  float m_DrawWidth;
  float m_DrawHeight;
    
  void Initialize()
  {
    m_UniqueID = UNIQUE_ID_COUNTER;
    UNIQUE_ID_COUNTER++;
    
    m_Position = new Vector2D();
    m_Forces = new Vector2D();
    
    m_Width = 8.f;
    m_Height = 8.f;
    m_HalfWidth = m_Width / 2.f;
    m_HalfHeight = m_Height / 2.f;
    m_DrawWidth = m_Width * 2.5f;
    m_DrawHeight = m_Height * 2.5f;
    
    if( EDITOR_MODE == true )
    {
      m_Position.x = 1.f;
      m_Position.y = 1.f;
    }
    else
    {            
      m_Position.x = random(m_Width, SCREEN_WIDTH - m_Width);
      m_Position.y = random(m_Height, SCREEN_HEIGHT - m_Height);    
    }
  }
  
  void Update()
  {
    //m_Forces.Multiply( 0.01 );
    //print( "id: " + m_UniqueID + " x " + m_Position.x + " y " + m_Position.y + '\n' ); 
    m_Position.Add( m_Forces );
    m_Position.x = CapFloat( m_Position.x, 0.f, (float)SCREEN_WIDTH );
    m_Position.y = CapFloat( m_Position.y, 0.f, (float)SCREEN_HEIGHT );       
    //print( "id: " + m_UniqueID + " x " + m_Position.x + " y " + m_Position.y + '\n' );    
    m_Forces.Zero();
  }
  
  void Draw()
  {       
    if( m_UniqueID == 0 )
    {
      return;
    }
    else
    {
      stroke( 0 );
      fill( 0 ); 
      ellipse( m_Position.x, m_Position.y, m_DrawWidth, m_DrawHeight );
      noFill();    
      ellipse( m_Position.x, m_Position.y, m_DrawWidth + 4.f, m_DrawHeight + 4.f );    
      ellipse( m_Position.x, m_Position.y, m_DrawWidth + 8.f, m_DrawHeight + 8.f );          
    }
  }
  
  void AddToForces( float X, float Y )
  {
    if( m_UniqueID == 0 )
    {
      return;
    }
        
    m_Forces.x += X;
    m_Forces.y += Y;    
  }
};