void 
object::findCollisions(object *objCol)
{
  //if difference between positions is smaller or equal
  //to sum of halfs of dimensions
  if(( abs(position.x - objCol->position.x)<=
	   (dimensions.x/2+objCol->dimensions.x/2) ) &&
	 ( abs(position.y - objCol->position.y)<=
	   (dimensions.y/2+objCol->dimensions.y/2) ) &&
	 //and objCol is not an object itself
	 (objCol != ((object*)this)) && 
	 //and objCol is not a ghost
	 !objCol->ghost)
	{
	  processCollision(objCol);
	}

  if(objCol -> hasChild())
	findCollisions((object*)(objCol -> child));

  if( objCol -> hasParent() && !(objCol -> isLast()) )
	findCollisions((object*)(objCol -> next));
}

being::processCollision(object *objCol)
{
  //difference between objects - to reduce positions
  float diffX, diffY;
  diffX = 0;
  diffY = 0;
  
  //when you are a being and you are hitting wall
  //you have to move back :-)
  if (typeid(*objCol) == typeid(block))
	{
	  //only when hitting in walls coordination's changes are necessary
	  
	  //if moving in right direction
	  if(velocity.x > 0)
	{
	  //if wall's left vertical line is between being's vertical lines
	  if(giveMaxX() >= objCol->giveMinX() && giveMinX() < objCol->giveMinX())
		diffX = objCol -> giveMinX() - giveMaxX() + 1;
	}
	  else
	//if moving in left direction
	if(velocity.x < 0)
	  {
		//if wall's right vertical line is between being's vertical lines
		if(giveMinX() <= objCol->giveMaxX() && giveMaxX() > objCol->giveMaxX())
		  diffX = objCol -> giveMaxX() - giveMinX() - 1;
	  }
	  
	  //wall's horizontal line is between being's horizontal lines
	  if(giveMaxY() >= objCol->giveMinY() && giveMinY() < objCol -> giveMinY())
	{
	  diffY = objCol -> giveMinY() - giveMaxY() + 1;
	}
	  
	  position.x += diffX;

	  if(diffY)
	{
	  velocity.y = 0;
	  position.y += diffY;
	}
	}
}