Function ControlZipLine

TombEngine/Objects/Generic/Object/ZipLine.cpp:93–170

	}

	void ControlZipLine(short itemNumber)
	{
		constexpr auto VEL_ACCEL   = 5.0f;
		constexpr auto VEL_MAX	   = 100.0f;

		auto& zipLineItem = g_Level.Items[itemNumber];
		auto& laraItem = *LaraItem;

		if (zipLineItem.Status != ITEM_ACTIVE)
			return;

		if (!(zipLineItem.Flags & IFLAG_INVISIBLE))
		{
			auto& prevPos = *(GameVector*)zipLineItem.Data;

			zipLineItem.Pose.Position = prevPos.ToVector3i();

			if (prevPos.RoomNumber != zipLineItem.RoomNumber)
				ItemNewRoom(itemNumber, prevPos.RoomNumber);

			zipLineItem.Status = ITEM_NOT_ACTIVE;
			SetAnimation(zipLineItem, 0);

			RemoveActiveItem(itemNumber);
			return;
		}

		if (zipLineItem.Animation.ActiveState == 1)
		{
			AnimateItem(zipLineItem);
			return;
		}

		AnimateItem(zipLineItem);

		// Accelerate.
		if (zipLineItem.Animation.Velocity.y < VEL_MAX)
			zipLineItem.Animation.Velocity.y += VEL_ACCEL;

		// Translate.
		// TODO: Use proper calculation of the trajectory instead of bitwise operation.
		auto headingOrient = EulerAngles(0, zipLineItem.Pose.Orientation.y, 0);
		zipLineItem.Pose.Translate(headingOrient, zipLineItem.Animation.Velocity.y);
		zipLineItem.Pose.Position.y += ((int)zipLineItem.Animation.Velocity.y >> 2);

		int vPos = zipLineItem.Pose.Position.y + CLICK(0.25f);
		auto pointColl = GetPointCollision(zipLineItem, zipLineItem.Pose.Orientation.y, zipLineItem.Animation.Velocity.y);

		// Update zip line room number.
		if (pointColl.GetRoomNumber() != zipLineItem.RoomNumber)
			ItemNewRoom(itemNumber, pointColl.GetRoomNumber());

		if (pointColl.GetFloorHeight() <= (vPos + CLICK(1)) || pointColl.GetCeilingHeight() >= (vPos - CLICK(1)))
		{
			// Dismount.
			if (laraItem.Animation.ActiveState == LS_ZIP_LINE)
			{
				laraItem.Animation.TargetState = LS_JUMP_FORWARD;