Method SelectTarget

PanzerChasm/server/monster.cpp:785–854

}

bool Monster::SelectTarget( const Map& map )
{
	{
		// Clear current target, if needed.
		const MonsterBasePtr target= target_.monster.lock();
		if( target != nullptr && target->Health() <= 0 )
		{
			target_.monster_id= 0u;
			target_.monster= MonsterBaseWeakPtr();
			target_.have_position= false;
		}

		// Already have target - do not select.
		if( target != nullptr && target->Health() > 0 && target_.have_position )
			return true;
	}

	const float c_half_view_angle= Constants::half_pi * 0.75f;
	const float c_half_view_angle_cos= std::cos( c_half_view_angle );
	const m_Vec2 view_dir( std::cos(angle_), std::sin(angle_) );

	float nearest_player_distance= Constants::max_float;
	const Map::PlayersContainer::value_type* nearest_player= nullptr;

	const Map::PlayersContainer& players= map.GetPlayers();
	for( const Map::PlayersContainer::value_type& player_value : players )
	{
		PC_ASSERT( player_value.second != nullptr );
		const Player& player= *player_value.second;

		if( player.Health() <= 0 )
			continue;

		const m_Vec2 dir_to_player= player.Position().xy() - Position().xy();
		const float distance_to_player= dir_to_player.Length();
		if( distance_to_player == 0.0f )
			continue;

		if( distance_to_player >= nearest_player_distance )
			continue;

		if( state_ == State::Idle )
		{
			// Monsters in Idle state have no back eyes.
			const float angle_cos= ( dir_to_player * view_dir ) / distance_to_player;
			if( angle_cos < c_half_view_angle_cos )
				continue;

			// Monsters in Idle state didn`t see invisible players.
			if( player.IsInvisible() )
				continue;
		}

		if( CanSee( map, player.Position() ) )
		{
			nearest_player_distance= distance_to_player;
			nearest_player= &player_value;
		}