class PlantBase
{

  Vector2D position;
  float size;
  float angle;
  float pulseAngle, pulseSize, prevPulseSize, prevPulseSizeDelta;
  float sineSpeed;
  float health  = 100;
  float size2;
 
  public PlantBase(Vector2D position_, float size_, float sineSpeed_)
  {
    sineSpeed = sineSpeed_;
    position = position_;
    size = size_;   
    angle = 0;
  }
 
  public void update(int i)
  {
    collideWithBullets();
    pulseAngle += sineSpeed;
    pulseSize = sin(pulseAngle);
    Vector2D walkPos = new Vector2D(hero.x, hero.y);
    angle += 0.01;
    if (position.isCirclePointCollision(size + 200, walkPos))
    {
      calcAngle();
      if (pulseSize > 0.30 && prevPulseSizeDelta > 0 && (pulseSize - prevPulseSize) < 0) 
      {
        plantBullets[plantBulletsCount] = new PlantBullet(new Vector2D(position), angle, 1);
        plantBulletsCount ++;
      }
    }
    prevPulseSizeDelta = pulseSize - prevPulseSize;
    prevPulseSize = pulseSize;
  } 
  
  public void draw()
  {    
    size2 = size / (1.0 + (1.0 - (health/100.0)));
    pushMatrix();     
    translate(position.getX(), position.getY());
    strokeWeight(1);
    stroke(40, 80, 40);
    ellipse(0, 0, size2 - sin(pulseSize)*2, size2 - sin(pulseSize)*2);
    rotate(angle);
    stroke(40, 70, 40);
    ellipse(size2/6, 0, size2/3 + sin(pulseSize)*5, size2/3 + sin(pulseSize)*5);
    strokeWeight(1);
    //rotate(angle);
    //ellipse(position.getX(), position.getY(), size, size);    
    popMatrix();
  }
  
  public void calcAngle()
  {
    Vector2D walkPos = new Vector2D(hero.x, hero.y);
    //float p = walkPos.getY();//  position.getY();
    //p =  position.getX();
    angle = atan2(walkPos.getY() - position.getY(), walkPos.getX() - position.getX());  
  }

 int clean(int i)
 {
   if (health < 0)
   {
     //warn this is global variable - array of all BugBase-s
     plants = removeArrayItem(i, plants);
     return 1;
   }
   return 0;
 }
 
 void collideWithBullets()
 {
   //check for collisions with bullets and react on it     
   for (int ib=0; ib<bulletsCount; ib++)
   {
       if (dist(position.getX(), position.getY(), bullets[ib].position.getX(), bullets[ib].position.getY()) < size2 + 2)
       {
         Vector2D bulletPos = new Vector2D(bullets[ib].position);
         health -= bullets[ib].strength * 12.0 / (size2 * 1.6)  ; //16 is the size anticomponent .... 16 makes 100 strong weapon do 100 damage to 16 sized creature
         bullets = removeArrayItem(ib, bullets);
         explosions[explosionsCount] = new Explosion(bulletPos, 3, 2);
         explosionsCount ++;      
       }   
     }
  }

 
}



public PlantBase[] removeArrayItem(int index, PlantBase[] items)
{
  if(index < plantsCount)
  {
    items[index] = null;
    for(int i = index + 1;i < plantsCount; i++)
    {
      items[i - 1] = items[i];
    }
    plantsCount--;
  }
  return items;
}