CnC_Remastered_Collection

DRIVE.CPP (92282B)

---

 //
 // Copyright 2020 Electronic Arts Inc.
 //
 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is free 
 // software: you can redistribute it and/or modify it under the terms of 
 // the GNU General Public License as published by the Free Software Foundation, 
 // either version 3 of the License, or (at your option) any later version.
 
 // TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed 
 // in the hope that it will be useful, but with permitted additional restrictions 
 // under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT 
 // distributed with this program. You should have received a copy of the 
 // GNU General Public License along with permitted additional restrictions 
 // with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
 
 /* $Header:   F:\projects\c&c\vcs\code\drive.cpv   2.17   16 Oct 1995 16:51:16   JOE_BOSTIC  $ */
 /***********************************************************************************************
  ***             C O N F I D E N T I A L  ---  W E S T W O O D   S T U D I O S               ***
  ***********************************************************************************************
  *                                                                                             *
  *                 Project Name : Command & Conquer                                            *
  *                                                                                             *
  *                    File Name : DRIVE.CPP                                                    *
  *                                                                                             *
  *                   Programmer : Joe L. Bostic                                                *
  *                                                                                             *
  *                   Start Date : April 22, 1994                                               *
  *                                                                                             *
  *                  Last Update : July 30, 1995 [JLB]                                          *
  *                                                                                             *
  *---------------------------------------------------------------------------------------------*
  * Functions:                                                                                  *
  *   DriveClass::AI -- Processes unit movement and rotation.                                   *
  *   DriveClass::Approach_Target -- Handles approaching the target in order to attack it.      *
  *   DriveClass::Assign_Destination -- Set the unit's NavCom.                                  *
  *   DriveClass::Class_Of -- Fetches a reference to the class type for this object.            *
  *   DriveClass::Debug_Dump -- Displays status information to monochrome screen.               *
  *   DriveClass::Do_Turn -- Tries to turn the vehicle to the specified direction.              *
  *   DriveClass::DriveClass -- Constructor for drive class object.                             *
  *   DriveClass::Exit_Map -- Give the unit a movement order to exit the map.                   *
  *   DriveClass::Fixup_Path -- Adds smooth start path to normal movement path.                 *
  *   DriveClass::Force_Track -- Forces the unit to use the indicated track.                    *
  *   DriveClass::Lay_Track -- Handles track laying logic for the unit.                         *
  *   DriveClass::Offload_Tiberium_Bail -- Offloads one Tiberium quantum from the object.       *
  *   DriveClass::Ok_To_Move -- Checks to see if this object can begin moving.                  *
  *   DriveClass::Overrun_Square -- Handles vehicle overrun of a cell.                          *
  *   DriveClass::Per_Cell_Process -- Handles when unit finishes movement into a cell.          *
  *   DriveClass::Smooth_Turn -- Handles the low level coord calc for smooth turn logic.        *
  *   DriveClass::Start_Of_Move -- Tries to get a unit to advance toward cell.                  *
  *   DriveClass::Tiberium_Load -- Determine the Tiberium load as a percentage.                 *
  *   DriveClass::While_Moving -- Processes unit movement.                                      *
  *   DriveClass::Mark_Track -- Marks the midpoint of the track as occupied.                    *
  * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
 #include	"function.h"
 
 
 DriveClass::DriveClass(void) : Class(0), SimLeptonX(0), SimLeptonY(0) {};			// Added SimLeptonX and Y. ST - 4/30/2019 8:06AM
 
 
 /***********************************************************************************************
  * DriveClass::Do_Turn -- Tries to turn the vehicle to the specified direction.                *
  *                                                                                             *
  *    This routine will set the vehicle to rotate to the direction specified. For tracked      *
  *    vehicles, it is just a simple rotation. For wheeled vehicles, it performs a series       *
  *    of short drives (three point turn) to face the desired direction.                        *
  *                                                                                             *
  * INPUT:   dir   -- The direction that this vehicle should face.                              *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   05/29/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Do_Turn(DirType dir)
 {
 	if (dir != PrimaryFacing) {
 
 		/*
 		**	Special rotation track is needed for units that
 		**	cannot rotate in place.
 		*/
 		if (Special.IsThreePoint && TrackNumber == -1 && Class->Speed == SPEED_WHEEL) {
 			int			facediff;	// Signed difference between current and desired facing.
 			FacingType	face;			// Current facing (ordinal value).
 
 			facediff = PrimaryFacing.Difference(dir) >> 5;
 			facediff = Bound(facediff, -2, 2);
 			if (facediff) {
 				face = Dir_Facing(PrimaryFacing);
 
 				IsOnShortTrack = true;
 				Force_Track(face*FACING_COUNT + (face + facediff), Coord);
 
 				Path[0] = FACING_NONE;
 				Set_Speed(0xFF);		// Full speed.
 			}
 		} else {
 			PrimaryFacing.Set_Desired(dir);
 			//if (Special.IsJurassic && AreThingiesEnabled && What_Am_I() == RTTI_UNIT && ((UnitClass *)this)->Class->IsPieceOfEight) PrimaryFacing.Set_Current(dir);
 			if (What_Am_I() == RTTI_UNIT && ((UnitClass *)this)->Class->IsPieceOfEight) PrimaryFacing.Set_Current(dir);
 		}
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::Force_Track -- Forces the unit to use the indicated track.                      *
  *                                                                                             *
  *    This override (nuclear bomb) style routine is to be used when a unit needs to start      *
  *    on a movement track but is outside the normal movement system. This occurs when a        *
  *    harvester starts driving off of a refinery.                                              *
  *                                                                                             *
  * INPUT:   track -- The track number to start on.                                             *
  *                                                                                             *
  *          coord -- The coordinate that the unit will end up at when the movement track       *
  *                   is completed.                                                             *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   03/17/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Force_Track(int track, COORDINATE coord)
 {
 	TrackNumber = track;
 	TrackIndex = 0;
 	Start_Driver(coord);
 }
 
 
 /***********************************************************************************************
  * DriveClass::Tiberium_Load -- Determine the Tiberium load as a percentage.                   *
  *                                                                                             *
  *    Use this routine to determine what the Tiberium load is (as a fixed point percentage).   *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  Returns with the current "fullness" rating for the object. This will be 0x0000 for *
  *          empty and 0x0100 for full.                                                         *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   03/17/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 int DriveClass::Tiberium_Load(void) const
 {
 	if (*this == UNIT_HARVESTER) {
 		return(Cardinal_To_Fixed(UnitTypeClass::STEP_COUNT, Tiberium));
 	}
 	return(0x0000);
 }
 
 
 /***********************************************************************************************
  * DriveClass::Approach_Target -- Handles approaching the target in order to attack it.        *
  *                                                                                             *
  *    This routine will check to see if the target is infantry and it can be overrun. It will  *
  *    try to overrun the infantry rather than attack it. This only applies to computer         *
  *    controlled vehicles. If it isn't the infantry overrun case, then it falls into the       *
  *    base class for normal (complex) approach algorithm.                                      *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   03/17/1995 JLB : Created.                                                                 *
  *   07/12/1995 JLB : Flamethrower tanks don't overrun -- their weapon is better.              *
  *=============================================================================================*/
 void DriveClass::Approach_Target(void)
 {
 	/*
 	**	Only if there is a legal target should the approach check occur.
 	*/
 	if (!House->IsHuman && Target_Legal(TarCom) && !Target_Legal(NavCom)) {
 
 		/*
 		**	Special case:
 		**	If this is for a unit that can crush infantry, and the target is
 		**	infantry, AND the infantry is pretty darn close, then just try
 		**	to drive over the infantry instead of firing on it.
 		*/
 		TechnoClass * target = As_Techno(TarCom);
 		if (Class->Primary != WEAPON_FLAME_TONGUE && Class->IsCrusher && Distance(TarCom) < 0x0180 && target && ((TechnoTypeClass const &)(target->Class_Of())).IsCrushable) {
 			Assign_Destination(TarCom);
 			return;
 		}
 	}
 
 	/*
 	**	In the other cases, uses the more complex "get to just within weapon range"
 	**	algorithm.
 	*/
 	FootClass::Approach_Target();
 }
 
 
 /***********************************************************************************************
  * DriveClass::Overrun_Square -- Handles vehicle overrun of a cell.                            *
  *                                                                                             *
  *    This routine is called when a vehicle enters a square or when it is about to enter a     *
  *    square (controlled by parameter). When a vehicle that can crush infantry enters a        *
  *    cell that contains infantry, then the infantry will be destroyed (regardless of          *
  *    affiliation). When a vehicle threatens to overrun a square, all occupying infantry       *
  *    will attempt to get out of the way.                                                      *
  *                                                                                             *
  * INPUT:   cell     -- The cell that is, or soon will be, entered by a vehicle.               *
  *                                                                                             *
  *          threaten -- Don't kill, but just threaten to enter the cell.                       *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   01/19/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Overrun_Square(CELL cell, bool threaten)
 {
 	CellClass * cellptr = &Map[cell];
 
 	if (Class->IsCrusher) {
 		if (threaten) {
 
 			/*
 			**	If the cell contains infantry, then they will panic when a vehicle tries
 			**	drive over them. Have the infantry run away instead.
 			*/
 			if (cellptr->Flag.Composite & 0x1F) {
 
 				/*
 				**	Scattering is controlled by the game difficulty level.
 				*/
 				if (((GameToPlay == GAME_NORMAL && PlayerPtr->Difficulty == DIFF_HARD) || Special.IsScatter || Scenario > 8) &&
 					!(GameToPlay == GAME_NORMAL && PlayerPtr->Difficulty == DIFF_EASY)) {
 					cellptr->Incoming(0, true);
 				}
 			}
 		} else {
 			ObjectClass * object = cellptr->Cell_Occupier();
 			int crushed = false;
 			while (object) {
 				if (object->Class_Of().IsCrushable && !House->Is_Ally(object) && Distance(object->Center_Coord()) < 0x80) {
 					ObjectClass * next = object->Next;
 					crushed = true;
 
 					/*
 					** Record credit for the kill(s)
 					*/
 					Sound_Effect(VOC_SQUISH2, Coord);
 					object->Record_The_Kill(this);
 					object->Mark(MARK_UP);
 					object->Limbo();
 					delete object;
 					new OverlayClass(OVERLAY_SQUISH, Coord_Cell(Coord));
 
 					object = next;
 				} else {
 					object = object->Next;
 				}
 			}
 			if (crushed) Do_Uncloak();
 		}
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::DriveClass -- Constructor for drive class object.                               *
  *                                                                                             *
  *    This will initialize the drive class to its default state. It is called as a result      *
  *    of creating a unit.                                                                      *
  *                                                                                             *
  * INPUT:   classid  -- The unit's ID class. It is passed on to the foot class constructor.    *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   07/13/1994 JLB : Created.                                                                 *
  *=============================================================================================*/
 DriveClass::DriveClass(UnitType classid, HousesType house) :
 	Class(&UnitTypeClass::As_Reference(classid)),
 	FootClass(house)
 {
 	/*
 	**	For two shooters, clear out the second shot flag -- it will be set the first time
 	**	the object fires. For non two shooters, set the flag since it will never be cleared
 	**	and the second shot flag tells the system that normal rearm times apply -- this is
 	**	what is desired for non two shooters.
 	*/
 	if (Class->IsTwoShooter) {
 		IsSecondShot = false;
 	} else {
 		IsSecondShot = true;
 	}
 	IsHarvesting = false;
 	IsTurretLockedDown = false;
 	IsOnShortTrack = false;
 	IsReturning = false;
 	TrackNumber = -1;
 	TrackIndex = 0;
 	SpeedAccum = 0;
 	Tiberium = 0;
 	Strength = Class->MaxStrength;
 }
 
 
 #ifdef CHEAT_KEYS
 /***********************************************************************************************
  * DriveClass::Debug_Dump -- Displays status information to monochrome screen.                 *
  *                                                                                             *
  *    This debug utility function will display the status of the drive class to the mono       *
  *    screen. It is through this information that bugs can be tracked down.                    *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   05/31/1994 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Debug_Dump(MonoClass *mono) const
 {
 	mono->Set_Cursor(33, 7);
 	mono->Printf("%2d:%2d", TrackNumber, TrackIndex);
 	mono->Text_Print("X", 16 + (IsTurretLockedDown?2:0), 10);
 //	mono->Text_Print("X", 16 + (IsOnShortTrack?2:0), 11);
 	mono->Set_Cursor(41, 7);mono->Printf("%d", Fixed_To_Cardinal(100, Tiberium_Load()));
 	FootClass::Debug_Dump(mono);
 }
 #endif
 
 
 /***********************************************************************************************
  * DriveClass::Exit_Map -- Give the unit a movement order to exit the map.                     *
  *                                                                                             *
  *    This routine is used to assign an appropriate movement destination for the unit so that  *
  *    it will leave the map. The scripts are usually the one to call this routine when it      *
  *    is determined that the unit has fulfilled its mission and must "depart".                 *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   05/31/1994 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Exit_Map(void)
 {
 	CELL	cell;		// Map exit cell number.
 
 	if (*this == UNIT_HOVER && !Target_Legal(NavCom)) {
 
 		/*
 		**	Scan a swath of cells from current position to the edge of the map and if
 		**	there is any blocking object, just wait so to try again later.
 		*/
 		Mark(MARK_UP);
 		for (int x = Cell_X(Coord_Cell(Center_Coord()))-1; x <= Cell_X(Coord_Cell(Center_Coord()))+1; x++) {
 			for (int y = Cell_Y(Coord_Cell(Center_Coord()))+1; y < Map.MapCellY+Map.MapCellHeight; y++) {
 				cell = XY_Cell(x, y);
 				if (Map[cell].Cell_Techno()) {
 					Mark(MARK_DOWN);
 					return;
 				}
 			}
 		}
 		Mark(MARK_DOWN);
 
 		/*
 		**	A clear path to the map edge exists. Assign it as the navigation computer
 		**	destination and let the transport move.
 		*/
 		cell = XY_Cell(Cell_X(Coord_Cell(Coord)), Map.MapCellY+Map.MapCellHeight);
 		IsReturning = true;
 		Assign_Destination(::As_Target(cell));
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::Smooth_Turn -- Handles the low level coord calc for smooth turn logic.          *
  *                                                                                             *
  *    This routine calculates the new coordinate value needed for the                          *
  *    smooth turn logic. The adjustment and flag values must be                                *
  *    determined prior to entering this routine.                                               *
  *                                                                                             *
  * INPUT:   adj      -- The adjustment coordinate as lifted from the                           *
  *                      correct smooth turn table.                                             *
  *                                                                                             *
  *          dir      -- Pointer to dir for possible modification                               *
  *                      according to the flag bits.                                            *
  *                                                                                             *
  * OUTPUT:  Returns with the coordinate the unit should positioned to.                         *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   03/14/1994 JLB : Created.                                                                 *
  *   07/13/1994 JLB : Converted to member function.                                            *
  *=============================================================================================*/
 COORDINATE DriveClass::Smooth_Turn(COORDINATE adj, DirType *dir)
 {
 	DirType	workdir = *dir;
 	int	x,y;
 	int   temp;
 	TrackControlType flags = TrackControl[TrackNumber].Flag;
 
 	x = Coord_X(adj);
 	y = Coord_Y(adj);
 
 	if (flags & F_T) {
 		temp	= x;
 		x		= y;
 		y 		= temp;
 		workdir = (DirType)(DIR_W - workdir);
 	}
 
 	if (flags & F_X) {
 		x 		 = -x;
 		workdir = (DirType)-workdir;
 	}
 
 	if (flags & F_Y) {
 		y = -y;
 		workdir = (DirType)(DIR_S - workdir);
 	}
 
 	*dir = workdir;
 
 	return(XY_Coord( Coord_X(Head_To_Coord()) + x, Coord_Y(Head_To_Coord()) + y));
 }
 
 
 /***********************************************************************************************
  * DriveClass::Assign_Destination -- Set the unit's NavCom.                                    *
  *                                                                                             *
  *    This routine is used to set the unit's navigation computer to the                        *
  *    specified target. Once the navigation computer is set, the unit                          *
  *    will start planning and moving toward the destination.                                   *
  *                                                                                             *
  * INPUT:   target   -- The destination target for the unit to head to.                        *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   09/07/1992 JLB : Created.                                                                 *
  *   04/15/1994 JLB : Converted to member function.                                            *
  *=============================================================================================*/
 void DriveClass::Assign_Destination(TARGET target)
 {
 
 	/*
 	**	Abort early if there is anything wrong with the parameters
 	**	or the unit already is assigned the specified destination.
 	*/
 	if (target == NavCom) return;
 
 #ifdef NEVER
 	UnitClass 		*tunit;		// Destination unit pointer.
 
 	/*
 	** When in move mode, a map position may really indicate
 	**	a unit to guard.
 	*/
 	if (Is_Target_Cell(target)) {
 		cell = As_Cell(target);
 
 		tunit = Map[cell].Cell_Unit();
 		if (tunit) {
 
 			/*
 			**	Prevent targeting of itself.
 			*/
 			if (tunit != this) {
 				target = tunit->As_Target();
 			}
 		} else {
 
 			tbuilding = Map[cell].Cell_Building();
 			if (tbuilding) {
 				target = tbuilding->As_Target();
 			}
 		}
 	}
 #endif
 
 	/*
 	**	For harvesting type vehicles, it might go into a dock and unload procedure
 	**	when the harvester is full and an empty refinery is selected as a target.
 	*/
 	BuildingClass * b = As_Building(target);
 
 	/*
 	**	Transport vehicles must tell all passengers that are about to load, that they
 	**	cannot proceed. This is accomplished with a radio message to this effect.
 	*/
 	//if (tunit && In_Radio_Contact() && Class->IsTransporter && Contact_With_Whom()->Is_Infantry()) {
 	if (In_Radio_Contact() && Class->IsTransporter && Contact_With_Whom()->Is_Infantry()) {
 		Transmit_Message(RADIO_OVER_OUT);
 	}
 
 	/*
 	**	If the player clicked on a friendly repair facility and the repair
 	**	facility is currently not involved with some other unit (radio or unloading).
 	*/
 	if (b && *b == STRUCT_REPAIR) {
 		if (b->In_Radio_Contact() && (b->Contact_With_Whom() != this)) {
 			ArchiveTarget = target;
 		} else {
 
 			/*
 			**	Establish radio contact protocol. If the facility responds correctly,
 			**	then remain in radio contact and proceed toward the desired destination.
 			*/
 			if (Transmit_Message(RADIO_HELLO, b) == RADIO_ROGER) {
 
 				/*
 				**	Last check to make sure that the loading square is free from permanent
 				**	occupation (such as a building).
 				*/
 				CELL cell = Coord_Cell(b->Center_Coord()) + (MAP_CELL_W-1);
 				if (Ground[Map[cell].Land_Type()].Cost[Class->Speed] ) {
 					if (Transmit_Message(RADIO_DOCKING) == RADIO_ROGER) {
 						FootClass::Assign_Destination(target);
 						Path[0] = FACING_NONE;
 						return;
 					}
 
 					/*
 					**	Failure to establish a docking relationship with the refinery.
 					**	Bail & await further instructions.
 					*/
 					Transmit_Message(RADIO_OVER_OUT);
 				}
 			}
 		}
 	}
 
 	/*
 	**	Set the unit's navigation computer.
 	*/
 	FootClass::Assign_Destination(target);
 	Path[0] = FACING_NONE;			// Force recalculation of path.
 	if (!IsDriving) {
 		Start_Of_Move();
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::While_Moving -- Processes unit movement.                                        *
  *                                                                                             *
  *    This routine is used to process movement for the units as they move.                     *
  *    It is called many times for each cell's worth of movement.   This                        *
  *    routine only applies after the next cell HeadTo has been determined.                     *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  true/false; Should this routine be called again?                                   *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   02/02/1992 JLB : Created.                                                                 *
  *   04/15/1994 JLB : Converted to member function.                                            *
  *=============================================================================================*/
 bool DriveClass::While_Moving(void)
 {
 	int	actual;			// Working movement addition value.
 
 	/*
 	**	Perform quick legality checks.
 	*/
 	if (!IsDriving || TrackNumber == -1 || (IsRotating && !Class->IsTurretEquipped)) {
 		SpeedAccum = 0;		// Kludge?  No speed should accumulate if movement is on hold.
 		return(false);
 	}
 
 	/*
 	**	If enough movement has accumulated so that the unit can
 	**	visibly move on the map, then process accordingly.
 	** Slow the unit down if he's carrying a flag.
 	*/
 	MPHType maxspeed = MPHType(min((int)(Class->MaxSpeed * House->GroundspeedBias), (int)MPH_LIGHT_SPEED));
 	if (((UnitClass *)this)->Flagged != HOUSE_NONE) {
 		actual = SpeedAccum + Fixed_To_Cardinal(maxspeed /2, Speed);
 	} else {
 		actual = SpeedAccum + Fixed_To_Cardinal(maxspeed, Speed);
 	}
 
 	if (actual > PIXEL_LEPTON_W) {
 		TurnTrackType	const *track;	// Track control pointer.
 		TrackType		const	*ptr;		// Pointer to coord offset values.
 		int				tracknum;		// The track number being processed.
 		FacingType		nextface;		// Next facing queued in path.
 		bool				adj;				// Is a turn coming up?
 
 		track = &TrackControl[TrackNumber];
 		if (IsOnShortTrack) {
 			tracknum = track->StartTrack;
 		} else {
 			tracknum = track->Track;
 		}
 		ptr = RawTracks[tracknum-1].Track;
 		nextface = Path[0];
 
 		/*
 		**	Determine if there is a turn coming up. If there is
 		**	a turn, then track jumping might occur.
 		*/
 		adj = false;
 		if (nextface != FACING_NONE && Dir_Facing(track->Facing) != nextface) {
 			adj = true;
 		}
 
 		/*
 		**	Skip ahead the number of track steps required (limited only
 		**	by track length). Set the unit to the new position and
 		**	flag the unit accordingly.
 		*/
 		Mark(MARK_UP);
 		while (actual > PIXEL_LEPTON_W) {
 			COORDINATE		offset;
 			DirType	dir;
 
 			actual -= PIXEL_LEPTON_W;
 
 			offset = ptr[TrackIndex].Offset;
 			if (offset || !TrackIndex) {
 				dir = ptr[TrackIndex].Facing;
 				Coord = Smooth_Turn(offset, &dir);
 
 				PrimaryFacing.Set(dir);
 
 				/*
 				**	See if "per cell" processing is necessary.
 				*/
 				if (TrackIndex && RawTracks[tracknum-1].Cell == TrackIndex) {
 					Per_Cell_Process(false);
 					if (!IsActive) {
 						return(false);
 					}
 				}
 
 				/*
 				**	The unit could "jump tracks". Check to see if the unit should
 				**	do so.
 				*/
 				if (*this != UNIT_GUNBOAT && nextface != FACING_NONE && adj && RawTracks[tracknum-1].Jump == TrackIndex && TrackIndex) {
 					TurnTrackType const *newtrack;		// Proposed jump-to track.
 					int	tnum;
 
 					tnum = Dir_Facing(track->Facing)*FACING_COUNT + nextface;
 					newtrack = &TrackControl[tnum];
 					if (newtrack->Track && RawTracks[newtrack->Track-1].Entry) {
 						COORDINATE	c = Head_To_Coord();
 						int oldspeed = Speed;
 
 						c = Adjacent_Cell(c, nextface);
 
 						switch(Can_Enter_Cell(Coord_Cell(c), nextface)) {
 							case MOVE_OK:
 								IsOnShortTrack = false;		// Shouldn't be necessary, but...
 								TrackNumber = tnum;
 								track = newtrack;
 
 	//			Mono_Printf("**Jumping from track %d to track %d. **\n", tracknum, track->Track);Keyboard::Get();
 
 								tracknum = track->Track;
 								TrackIndex = RawTracks[tracknum-1].Entry-1;	// Anticipate increment.
 								ptr = RawTracks[tracknum-1].Track;
 								adj = false;
 
 								Stop_Driver();
 								Per_Cell_Process(true);
 								if (Start_Driver(c)) {
 									Set_Speed(oldspeed);
 									memcpy(&Path[0], &Path[1], CONQUER_PATH_MAX-1);
 									Path[CONQUER_PATH_MAX-1] = FACING_NONE;
 								} else {
 									Path[0] = FACING_NONE;
 									TrackNumber = -1;
 									actual = 0;
 								}
 								break;
 
 							case MOVE_CLOAK:
 								Map[Coord_Cell(c)].Shimmer();
 								break;
 
 							case MOVE_TEMP:
 								if (*this == UNIT_HARVESTER || !House->IsHuman) {
 									bool old = Special.IsScatter;
 									Special.IsScatter = true;
 									Map[Coord_Cell(c)].Incoming(0, true);
 									Special.IsScatter = old;
 								}
 								break;
 						}
 					}
 				}
 				TrackIndex++;
 
 			} else {
 				actual = 0;
 				Coord = Head_To_Coord();
 				Stop_Driver();
 				TrackNumber = -1;
 				TrackIndex = NULL;
 
 				/*
 				**	Perform "per cell" activities.
 				*/
 				Per_Cell_Process(true);
 
 				break;
 			}
 		}
 		if (IsActive) {
 			Mark(MARK_DOWN);
 		}
 	}
 
 
 
 	/*
 	**  NEW 4/30/2019 7:59AM
 	** 
 	**  When we don't have enough speed accumulated to move another pixel, it would be good to know at a sub-pixel (lepton) level
 	**  how far we would move if we could. It didn't matter in the original when it was 320x200 pixels, but on a 3840x2160
 	**  screen, what was half a pixel could now be several pixels.
 	** 
 	**  ST
 	** 
 	*/
 	if (actual && actual <= PIXEL_LEPTON_W) {
 		TurnTrackType	const *track;	// Track control pointer.
 		TrackType		const	*ptr;		// Pointer to coord offset values.
 		int				tracknum;		// The track number being processed.
 		FacingType		nextface;		// Next facing queued in path.
 		bool				adj;				// Is a turn coming up?
 
 		track = &TrackControl[TrackNumber];
 		if (IsOnShortTrack) {
 			tracknum = track->StartTrack;
 		} else {
 			tracknum = track->Track;
 		}
 		ptr = RawTracks[tracknum-1].Track;
 		nextface = Path[0];
 
 		/*
 		**	Determine if there is a turn coming up. If there is
 		**	a turn, then track jumping might occur.
 		*/
 		adj = false;
 		if (nextface != FACING_NONE && Dir_Facing(track->Facing) != nextface) {
 			adj = true;
 		}
 
 		COORDINATE simulated_pos = Coord;
 
 		COORDINATE		offset;
 		DirType	dir;
 
 		offset = ptr[TrackIndex].Offset;
 		if (offset || !TrackIndex) {
 			dir = ptr[TrackIndex].Facing;
 			simulated_pos = Smooth_Turn(offset, &dir);
 		}
 
 		int x_diff = Coord_X(simulated_pos) - Coord_X(Coord);
 		int y_diff = Coord_Y(simulated_pos) - Coord_Y(Coord);
 
 		SimLeptonX = (x_diff * actual) / PIXEL_LEPTON_W;
 		SimLeptonY = (y_diff * actual) / PIXEL_LEPTON_W;
 	} else {
 		SimLeptonX = 0;
 		SimLeptonY = 0;
 	}	
 
 
 
 	/*
 	**	Replace any remainder back into the unit's movement
 	**	accumulator to be processed next pass.
 	*/
 	SpeedAccum = actual;
 	return(true);
 }
 
 
 /***********************************************************************************************
  * DriveClass::Per_Cell_Process -- Handles when unit finishes movement into a cell.            *
  *                                                                                             *
  *    This routine is called when a unit has mostly or completely                              *
  *    entered a cell. The unit might be in the middle of a movement track                      *
  *    when this routine is called. It's primary purpose is to perform                          *
  *    sighting and other "per cell" activities.                                                *
  *                                                                                             *
  * INPUT:   center   -- Is the unit safely at the center of a cell?  If it is merely "close"   *
  *                      to the center, then this parameter will be false.                      *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   11/03/1993 JLB : Created.                                                                 *
  *   03/30/1994 JLB : Revamped for track system.                                               *
  *   04/15/1994 JLB : Converted to member function.                                            *
  *   06/18/1994 JLB : Converted to virtual function.                                           *
  *   06/18/1994 JLB : Distinguishes between center and near-center conditions.                 *
  *=============================================================================================*/
 void DriveClass::Per_Cell_Process(bool center)
 {
 	CELL	cell = Coord_Cell(Coord);
 
 	/*
 	**	Check to see if it has reached its destination. If so, then clear the NavCom
 	**	regardless of the remaining path list.
 	*/
 	if (center && As_Cell(NavCom) == cell) {
 		IsTurretLockedDown = false;
 		NavCom = TARGET_NONE;
 		Path[0] = FACING_NONE;
 	}
 
 #ifdef NEVER
 	/*
 	**	A "lemon" vehicle will have a tendency to break down as
 	**	it moves about the terrain.
 	*/
 	if (Is_A_Lemon) {
 		if (Random_Pick(1, 4) == 1) {
 			Take_Damage(1);
 		}
 	}
 #endif
 
 	Lay_Track();
 
 	FootClass::Per_Cell_Process(center);
 }
 
 
 /***********************************************************************************************
  * DriveClass::Start_Of_Move -- Tries to get a unit to advance toward cell.                    *
  *                                                                                             *
  *    This will try to start a unit advancing toward the cell it is                            *
  *    facing. It will check for and handle legality and reserving of the                       *
  *    necessary cell.                                                                          *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  true/false; Should this routine be called again because                            *
  *                      initial start operation is temporarily delayed?                        *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   02/02/1992 JLB : Created.                                                                 *
  *   10/18/1993 JLB : This should be called repeatedly until HeadTo is not NULL.               *
  *   03/16/1994 JLB : Revamped for track logic.                                                *
  *   04/15/1994 JLB : Converted to member function.                                            *
  *   06/19/1995 JLB : Fixed so that it won't fire on ground unnecessarily.                     *
  *   07/13/1995 JLB : Handles bumping into cloaked objects.                                    *
  *=============================================================================================*/
 bool DriveClass::Start_Of_Move(void)
 {
 	FacingType		facing;				// Direction movement will commence.
 	DirType			dir;				// Desired actual facing toward destination.
 	int				facediff;			// Difference between current and desired facing.
 	int				speed;				// Speed of unit.
 	CELL				destcell;			// Cell of destination.
 	LandType			ground;				// Ground unit is entering.
 	COORDINATE				dest;					// Destination coordinate.
 
 	facing = Path[0];
 
 	if (!Target_Legal(NavCom) && facing == FACING_NONE) {
 		IsTurretLockedDown = false;
 		Stop_Driver();
 		if (Mission == MISSION_MOVE) {
 			Enter_Idle_Mode();
 		}
 		return(false);		// Why is it calling this routine!?!
 	}
 
 #ifdef NEVER
 	/*
 	**	Movement start logic can't begin until a unit that requires
 	**	a locked down turret gets to a locked down state (i.e., the
 	**	turret rotation stops.
 	*/
 	if (ClassF & CLASSF_LOCKTURRET) {
 		Set_Secondary_Facing(facing<<5);
 		if (Is_Rotating) {
 			return(true);
 		}
 	}
 #endif
 
 	/*
 	**	Reduce the path length if the target is a unit and the
 	**	range to the unit is less than the precalculated path steps.
 	*/
 	if (facing != FACING_NONE) {
 		int	dist;
 
 		if (Is_Target_Unit(NavCom) || Is_Target_Infantry(NavCom)) {
 			dist = Lepton_To_Cell(Distance(NavCom));
 
 //			if (dist > CELL_LEPTON_W ||
 //				!As_Techno(NavCom)->Techno_Type_Class()->IsCrushable ||
 //				!Class->IsCrusher) {
 
 				if (dist < CONQUER_PATH_MAX) {
 					Path[dist] = FACING_NONE;
 					facing = Path[0];		// Maybe needed.
 				}
 //			}
 		}
 	}
 
 	/*
 	**	If the path is invalid at this point, then generate one. If
 	**	generating a new path fails, then abort NavCom.
 	*/
 	if (facing == FACING_NONE) {
 
 		/*
 		**	If after a path search, there is still no valid path, then set the
 		**	NavCom to null and let the script take care of assigning a new
 		**	navigation target.
 		*/
 		if (!PathDelay.Expired()) {
 			return(false);
 		}
 		if (!Basic_Path()) {
 			if (Distance(NavCom) < 0x0280 && (Mission == MISSION_MOVE || Mission == MISSION_GUARD_AREA)) {
 				Assign_Destination(TARGET_NONE);
 			} else {
 
 				/*
 				**	If a basic path could be found, but the immediate move destination is
 				**	blocked by a friendly temporary blockage, then cause that blockage
 				**	to scatter. If the destination is also one cell away, then scatter
 				**	regardless of direction.
 				*/
 				CELL ourcell = Coord_Cell(Center_Coord());
 				CELL navcell = As_Cell(NavCom);
 				CELL cell = -1;
 				if (::Distance(ourcell, navcell) < 2) {
 					cell = navcell;
 				} else {
 					cell = Adjacent_Cell(ourcell, PrimaryFacing.Current());
 				}
 				if (Map.In_Radar(cell)) {
 					if (Can_Enter_Cell(cell) == MOVE_TEMP) {
 						CellClass * cellptr = &Map[cell];
 						TechnoClass * blockage = cellptr->Cell_Techno();
 						if (blockage && House->Is_Ally(blockage)) {
 							bool old = Special.IsScatter;
 							Special.IsScatter = true;
 							cellptr->Incoming(0, true);
 							Special.IsScatter = old;
 						}
 					}
 				}
 
 				if (TryTryAgain) {
 					TryTryAgain--;
 				} else {
 					Assign_Destination(TARGET_NONE);
 					if (IsNewNavCom) Sound_Effect(VOC_SCOLD);
 					IsNewNavCom = false;
 				}
 			}
 			Stop_Driver();
 			TrackNumber = -1;
 			IsTurretLockedDown = false;
 			return(false);
 		}
 
 		/*
 		**	If a basic path could be found, but the immediate move destination is
 		**	blocked by a friendly temporary blockage, then cause that blockage
 		**	to scatter.
 		*/
 		CELL cell = Adjacent_Cell(Coord_Cell(Center_Coord()), Path[0]);
 		if (Map.In_Radar(cell)) {
 			if (Can_Enter_Cell(cell) == MOVE_TEMP) {
 				CellClass * cellptr = &Map[cell];
 				TechnoClass * blockage = cellptr->Cell_Techno();
 				if (blockage && House->Is_Ally(blockage)) {
 					bool old = Special.IsScatter;
 					Special.IsScatter = true;
 					cellptr->Incoming(0, true);
 					Special.IsScatter = old;
 				}
 			}
 		}
 
 		TryTryAgain = PATH_RETRY;
 		facing = Path[0];
 	}
 
 	if (Class->IsLockTurret || !Class->IsTurretEquipped) {
 		IsTurretLockedDown = true;
 	}
 
 #ifdef NEVER
 	/*
 	**	If the turret needs to match the body's facing before
 	**	movement can occur, then start it's rotation and
 	**	don't start a movement track until it is aligned.
 	*/
 	if (!Ok_To_Move(BodyFacing)) {
 		return(true);
 	}
 #endif
 
 	/*
 	**	Determine the coordinate of the next cell to move into.
 	*/
 	dest = Adjacent_Cell(Coord, facing);
 	dir = Facing_Dir(facing);
 
 	/*
 	**	Set the facing correctly if it isn't already correct. This
 	**	means starting a rotation track if necessary.
 	*/
 	facediff = PrimaryFacing.Difference(dir);
 	if (facediff) {
 
 		/*
 		**	Request a change of facing.
 		*/
 		Do_Turn(dir);
 		return(true);
 
 	} else {
 
 		/* NOTE:  Beyond this point, actual track assignment can begin.
 		**
 		**	If the cell to move into is impassable (probably for some unexpected
 		**	reason), then abort the path list and set the speed to zero. The
 		** next time this routine is called, a new path will be generated.
 		*/
 		destcell = Coord_Cell(dest);
 		Mark(MARK_UP);
 		MoveType cando = Can_Enter_Cell(destcell, facing);
 		Mark(MARK_DOWN);
 
 		if (cando != MOVE_OK) {
 
 			if (Mission == MISSION_MOVE && House->IsHuman && Distance(NavCom) < 0x0200) {
 				Assign_Destination(TARGET_NONE);
 			}
 
 			/*
 			**	If a temporary friendly object is blocking the path, then cause it to
 			**	get out of the way.
 			*/
 			if (cando == MOVE_TEMP) {
 				bool old = Special.IsScatter;
 				Special.IsScatter = true;
 				Map[destcell].Incoming(0, true);
 				Special.IsScatter = old;
 			}
 
 			/*
 			**	If a cloaked object is blocking, then shimmer the cell.
 			*/
 			if (cando == MOVE_CLOAK) {
 				Map[destcell].Shimmer();
 			}
 
 			Stop_Driver();
 			if (cando != MOVE_MOVING_BLOCK) {
 			 	Path[0] = FACING_NONE;		// Path is blocked!
 			}
 
 			/*
 			** If blocked by a moving block then just exit start of move and
 			** try again next tick.
 			*/
 			if (cando == MOVE_DESTROYABLE) {
 				if (Map[destcell].Cell_Object()) {
 					if (!House->Is_Ally(Map[destcell].Cell_Object())) {
 						Override_Mission(MISSION_ATTACK, Map[destcell].Cell_Object()->As_Target(), TARGET_NONE);
 					}
 				} else {
 					if (Map[destcell].Overlay != OVERLAY_NONE && OverlayTypeClass::As_Reference(Map[destcell].Overlay).IsWall) {
 						Override_Mission(MISSION_ATTACK, ::As_Target(destcell), TARGET_NONE);
 					}
 				}
 			} else {
 				if (IsNewNavCom) Sound_Effect(VOC_SCOLD);
 			}
 			IsNewNavCom = false;
 			TrackNumber = -1;
 			return(true);
 		}
 
 		/*
 		**	Determine the speed that the unit can travel to the desired square.
 		*/
 		ground = Map[destcell].Land_Type();
 		speed = Ground[ground].Cost[Class->Speed];
 		if (!speed) speed = 128;
 
 #ifdef NEVER
 		/*
 		**	Set the jiggle flag if the terrain would cause the unit
 		**	to jiggle when travelled over.
 		*/
 		BaseF &= ~BASEF_JIGGLE;
 		if (Ground[ground].Jiggle) {
 			BaseF |= BASEF_JIGGLE;
 		}
 #endif
 
 		/*
 		**	A damaged unit has a reduced speed.
 		*/
 		if ((Class->MaxStrength>>1) > Strength) {
 			speed -= (speed>>2);	// Three quarters speed.
 		}
 		if ((speed != Speed)/* || !SpeedAdd*/) {
 			Set_Speed(speed);		// Full speed.
 		}
 
 		/*
 		**	Adjust speed depending on distance to ultimate movement target. The
 		**	further away the target is, the faster the vehicle will travel.
 		*/
 		int dist = Distance(NavCom);
 		if (dist < 0x0200) {
 			speed = Fixed_To_Cardinal(speed, 0x00A0);
 		} else {
 			if (dist < 0x0700) {
 				speed = Fixed_To_Cardinal(speed, 0x00D0);
 			}
 		}
 
 		/*
 		**	Reserve the destination cell so that it won't become
 		**	occupied AS this unit is moving into it.
 		*/
 		if (cando != MOVE_OK) {
 		 	Path[0] = FACING_NONE;		// Path is blocked!
 			TrackNumber = -1;
 		 	dest = NULL;
 		} else {
 
 			Overrun_Square(Coord_Cell(dest), true);
 
 			/*
 			**	Determine which track to use (based on recorded path).
 			*/
 			FacingType nextface = Path[1];
 			if (nextface == FACING_NONE) nextface = facing;
 
 			IsOnShortTrack = false;
 			TrackNumber = facing * FACING_COUNT + nextface;
 			if (TrackControl[TrackNumber].Track == 0) {
 				Path[0] = FACING_NONE;
 				TrackNumber = -1;
 				return(true);
 			} else {
 				if (TrackControl[TrackNumber].Flag & F_D) {
 					/*
 					**	If the middle cell of a two cell track contains a crate,
 					**	the check for goodies before movement starts.
 					*/
 					if (!Map[destcell].Goodie_Check(this)) {
 						cando = MOVE_NO;
 					} else {
 
 						dest = Adjacent_Cell(dest, nextface);
 						destcell = Coord_Cell(dest);
 						cando = Can_Enter_Cell(destcell);
 					}
 
 					if (cando != MOVE_OK) {
 
 						/*
 						**	If a temporary friendly object is blocking the path, then cause it to
 						**	get out of the way.
 						*/
 						if (cando == MOVE_TEMP) {
 							bool old = Special.IsScatter;
 							Special.IsScatter = true;
 							Map[destcell].Incoming(0, true);
 							Special.IsScatter = old;
 						}
 
 						/*
 						**	If a cloaked object is blocking, then shimmer the cell.
 						*/
 						if (cando == MOVE_CLOAK) {
 							Map[destcell].Shimmer();
 						}
 
 						Path[0] = FACING_NONE;		// Path is blocked!
 						TrackNumber = -1;
 						dest = NULL;
 						if (cando == MOVE_DESTROYABLE) {
 
 							if (Map[destcell].Cell_Object()) {
 								if (!House->Is_Ally(Map[destcell].Cell_Object())) {
 									Override_Mission(MISSION_ATTACK, Map[destcell].Cell_Object()->As_Target(), TARGET_NONE);
 								}
 							} else {
 								if (Map[destcell].Overlay != OVERLAY_NONE && OverlayTypeClass::As_Reference(Map[destcell].Overlay).IsWall) {
 									Override_Mission(MISSION_ATTACK, ::As_Target(destcell), TARGET_NONE);
 								}
 							}
 							IsNewNavCom = false;
 							TrackIndex = 0;
 							return(true);
 						}
 					} else {
 						memcpy(&Path[0], &Path[2], CONQUER_PATH_MAX-2);
 						Path[CONQUER_PATH_MAX-2] = FACING_NONE;
 						IsPlanningToLook = true;
 					}
 				} else {
 					memcpy(&Path[0], &Path[1], CONQUER_PATH_MAX-1);
 				}
 				Path[CONQUER_PATH_MAX-1] = FACING_NONE;
 			}
 		}
 
 		IsNewNavCom = false;
 		TrackIndex = 0;
 		if (!Start_Driver(dest)) {
 			TrackNumber = -1;
 			Path[0] = FACING_NONE;
 			Set_Speed(0);
 		}
 	}
 	return(false);
 }
 
 
 /***********************************************************************************************
  * DriveClass::AI -- Processes unit movement and rotation.                                     *
  *                                                                                             *
  *    This routine is used to process unit movement and rotation. It                           *
  *    functions autonomously from the script system. Thus, once a unit                         *
  *    is give rotation command or movement path, it will follow this                           *
  *    until specifically instructed to stop. The advantage of this                             *
  *    method is that it allows smooth movement of units, faster game                           *
  *    execution, and reduced script complexity (since actual movement                          *
  *    dynamics need not be controlled directly by the scripts).                                *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   This routine relies on the process control bits for the                         *
  *             specified unit (for speed reasons). Thus, only setting                          *
  *             movement, rotation, or path list will the unit perform                          *
  *             any physics.                                                                    *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   09/26/1993 JLB : Created.                                                                 *
  *   04/15/1994 JLB : Converted to member function.                                            *
  *=============================================================================================*/
 void DriveClass::AI(void)
 {
 	FootClass::AI();
 
 	/*
 	**	If the unit is following a track, then continue
 	**	to do so -- mindlessly.
 	*/
 	if (TrackNumber != -1) {
 
 		/*
 		**	Perform the movement accumulation.
 		*/
 		While_Moving();
 		if (!IsActive) return;
 		if (TrackNumber == -1 && (Target_Legal(NavCom) || Path[0] != FACING_NONE)) {
 			Start_Of_Move();
 			While_Moving();
 			if (!IsActive) return;
 		}
 
 	} else {
 
 		/*
 		**	For tracked units that are rotating in place, perform the rotation now.
 		*/
 		if ((Class->Speed == SPEED_FLOAT || Class->Speed == SPEED_HOVER || Class->Speed == SPEED_TRACK || (Class->Speed == SPEED_WHEEL && !Special.IsThreePoint)) && PrimaryFacing.Is_Rotating()) {
 			if (PrimaryFacing.Rotation_Adjust((int)(Class->ROT * House->GroundspeedBias))) {
 				Mark(MARK_CHANGE);
 			}
 			if (!IsRotating) {
 				Per_Cell_Process(true);
 				if (!IsActive) return;
 			}
 
 		} else {
 
 			/*
 			**	The unit has no track to follow, but if there
 			**	is a navigation target or a remaining path,
 			**	then start on a new track.
 			*/
 			if (Mission != MISSION_GUARD || NavCom != TARGET_NONE) {
 				if (Target_Legal(NavCom) || Path[0] != FACING_NONE) {
 					Start_Of_Move();
 					While_Moving();
 					if (!IsActive) return;
 				} else {
 					Stop_Driver();
 				}
 			}
 		}
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::Fixup_Path -- Adds smooth start path to normal movement path.                   *
  *                                                                                             *
  *    This routine modifies the path of the specified unit so that it                          *
  *    will not start out with a rotation. This is necessary for those                          *
  *    vehicles that have difficulty with rotating in place. Typically,                         *
  *    this includes wheeled vehicles.                                                          *
  *                                                                                             *
  * INPUT:   unit  -- Pointer to the unit to adjust.                                            *
  *                                                                                             *
  *          path  -- Pointer to path structure.                                                *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   Only units that require a fixup get modified. The                               *
  *             modification only occurs, if there is a legal path to                           *
  *             do so.                                                                          *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   04/03/1994 JLB : Created.                                                                 *
  *   04/06/1994 JLB : Uses path structure.                                                     *
  *   04/10/1994 JLB : Diagonal smooth turn added.                                              *
  *   04/15/1994 JLB : Converted to member function.                                            *
  *=============================================================================================*/
 void DriveClass::Fixup_Path(PathType *path)
 {
 	FacingType stage[6]={FACING_N,FACING_N,FACING_N,FACING_N,FACING_N,FACING_N};		// Prefix path elements.
 	int	facediff;		// The facing difference value (0..4 | 0..-4).
 	static FacingType _path[4][6] = {
 		{(FacingType)2,(FacingType)0,(FacingType)2,(FacingType)0,(FacingType)0,(FacingType)0},
 		{(FacingType)3,(FacingType)0,(FacingType)2,(FacingType)2,(FacingType)0,(FacingType)0},
 		{(FacingType)4,(FacingType)0,(FacingType)2,(FacingType)2,(FacingType)0,(FacingType)0},
 		{(FacingType)4,(FacingType)0,(FacingType)2,(FacingType)2,(FacingType)1,(FacingType)0}
 	};
 	static FacingType _dpath[4][6] = {
 		{(FacingType)0,(FacingType)0,(FacingType)0,(FacingType)0,(FacingType)0,(FacingType)0},
 		{(FacingType)3,(FacingType)0,(FacingType)2,(FacingType)2,(FacingType)0,(FacingType)0},
 		{(FacingType)4,(FacingType)0,(FacingType)2,(FacingType)2,(FacingType)1,(FacingType)0},
 		{(FacingType)5,(FacingType)0,(FacingType)2,(FacingType)2,(FacingType)1,(FacingType)0}
 	};
 
 	int			index;
 	int			counter;			// Path addition
 	FacingType	*ptr;				// Path list pointer.
 	FacingType	*ptr2;			// Copy of new path list pointer.
 	FacingType	nextpath;		// Next path value.
 	CELL			cell;				// Working cell value.
 	bool			ok;
 
 	/*
 	**	Verify that the unit is valid and there is a path problem to resolve.
 	*/
 	if (!path || path->Command[0] == FACING_NONE) {
 		return;
 	}
 
 	/*
 	**	Only wheeled vehicles need a path fixup -- to avoid 3 point turns.
 	*/
 	if (!Special.IsThreePoint || Class->Speed != SPEED_WHEEL) {
 		return;
 	}
 
 	/*
 	**	If the original path starts in the same direction as the unit, then
 	**	there is no problem to resolve -- abort.
 	*/
 	facediff = PrimaryFacing.Difference((DirType)(path->Command[0]<<5)) >> 5;
 
 	if (!facediff) return;
 
 	if (Dir_Facing(PrimaryFacing) & FACING_NE) {
 		ptr = &_dpath[(FacingType)ABS((int)facediff)-FACING_NE][1];			// Pointer to path adjust list.
  		counter = (int)_dpath[(FacingType)ABS((int)facediff)-FACING_NE][0];		// Number of path adjusts.
 	} else {
 		ptr = &_path[(FacingType)ABS((int)facediff)-FACING_NE][1];			// Pointer to path adjust list.
  		counter = (int)_path[(FacingType)ABS((int)facediff)-FACING_NE][0];		// Number of path adjusts.
 	}
 	ptr2 = ptr;
 
 	ok = true;										// Presume adjustment is all ok.
 	cell = Coord_Cell(Coord);	// Starting cell.
 	nextpath = Dir_Facing(PrimaryFacing);	// Starting path.
 	for (index = 0; index < counter; index++) {
 
 		/*
 		**	Determine next path element and add it to the
 		**	working path list.
 		*/
 		if (facediff > 0) {
 			nextpath = nextpath + *ptr++;
 		} else {
 			nextpath = nextpath - *ptr++;
 		}
 		stage[index] = nextpath;
 		cell = Adjacent_Cell(cell, nextpath);
 		//cell = Coord_Cell(Adjacent_Cell(Cell_Coord(cell), nextpath));
 
 		/*
 		**	If it can't enter this cell, then abort the path
 		**	building operation without adjusting the unit's
 		**	path.
 		*/
 		if (Can_Enter_Cell(cell, nextpath) != MOVE_OK) {
 			ok = false;
 			break;
 		}
 	}
 
 	/*
 	**	If veering to the left was not successful, then try veering
 	**	to the right. This only makes sense if the vehicle is trying
 	**	to turn 180 degrees.
 	*/
 	if (!ok && ABS(facediff) == 4) {
 		ptr = ptr2;											// Pointer to path adjust list.
 		facediff = -facediff;
 		ok = true;											// Presume adjustment is all ok.
 		cell = Coord_Cell(Coord);						// Starting cell.
 		nextpath = Dir_Facing(PrimaryFacing);		// Starting path.
 		for (index = 0; index < counter; index++) {
 
 			/*
 			**	Determine next path element and add it to the
 			**	working path list.
 			*/
 			if (facediff > 0) {
 				nextpath = nextpath + *ptr++;
 			} else {
 				nextpath = nextpath - *ptr++;
 			}
 			stage[index] = nextpath;
 			cell = Coord_Cell(Adjacent_Cell(Cell_Coord(cell), nextpath));
 
 			/*
 			**	If it can't enter this cell, then abort the path
 			**	building operation without adjusting the unit's
 			**	path.
 			*/
 			if (Can_Enter_Cell(cell, nextpath) != MOVE_OK) {
 				ok = false;
 				break;
 			}
 		}
 	}
 
 	/*
 	**	If a legal path addition was created, then install it in place
 	**	of the first path value. The initial path entry is to be replaced
 	**	with a sequence of path entries that create smooth turning.
 	*/
 	if (ok) {
 		if (path->Length <= 1) {
 			movmem(&stage[0], path->Command, MAX(counter, 1));
 			path->Length = counter;
 		} else {
 
 			/*
 			**	Optimize the transition path step from the smooth turn
 			**	first part as it joins with the rest of the normal
 			**	path. The normal prefix path steps are NOT to be optimized.
 			*/
 			if (counter) {
 				counter--;
 				path->Command[0] = stage[counter];
 				Optimize_Moves(path, MOVE_OK);
 			}
 
 			/*
 			**	If there is more than one prefix path element, then
 			**	insert the rest now.
 			*/
 			if (counter) {
 				movmem(&path->Command[0], &path->Command[counter], 40-counter);
 				movmem(&stage[0], &path->Command[0], counter);
 				path->Length += counter;
 			}
 		}
 		path->Command[path->Length] = FACING_NONE;
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::Lay_Track -- Handles track laying logic for the unit.                           *
  *                                                                                             *
  *    This routine handles the track laying for the unit. This entails examining the unit's    *
  *    current location as well as the direction and whether this unit is allowed to lay        *
  *    tracks in the first place.                                                               *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   05/28/1994 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Lay_Track(void)
 {
 #ifdef NEVER
 	static IconCommandType *_trackdirs[8] = {
 		TrackN_S,
 		TrackNE_SW,
 		TrackE_W,
 		TrackNW_SE,
 		TrackN_S,
 		TrackNE_SW,
 		TrackE_W,
 		TrackNW_SE
 	};
 
 	if (!(ClassF & CLASSF_TRACKS)) return;
 
 	Icon_Install(Coord_Cell(Coord), _trackdirs[Facing_To_8(BodyFacing)]);
 #endif
 }
 
 
 /***********************************************************************************************
  * DriveClass::Mark_Track -- Marks the midpoint of the track as occupied.                      *
  *                                                                                             *
  *    This routine will ensure that the midpoint (if any) of the track that the unit is        *
  *    following, will be marked according to the mark type specified.                          *
  *                                                                                             *
  * INPUT:   headto   -- The head to coordinate.                                                *
  *                                                                                             *
  *          type     -- The type of marking to perform.                                        *
  *                                                                                             *
  * OUTPUT:  none                                                                               *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   07/30/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 void DriveClass::Mark_Track(COORDINATE headto, MarkType type)
 {
 	int value;
 
 	if (type == MARK_UP) {
 		value = false;
 	} else {
 		value = true;
 	}
 
 	if (headto) {
 		if (!IsOnShortTrack && TrackNumber != -1) {
 
 			/*
 			** If we have not passed the per cell process point we need
 			** to deal with it.
 			*/
 			int tracknum = TrackControl[TrackNumber].Track;
 			if (tracknum) {
 				TrackType const * ptr = RawTracks[tracknum - 1].Track;
 				int cellidx = RawTracks[tracknum - 1].Cell;
 				if (cellidx > -1) {
 					DirType dir = ptr[cellidx].Facing;
 
 					if (TrackIndex < cellidx && cellidx != -1) {
 						COORDINATE offset = Smooth_Turn(ptr[cellidx].Offset, &dir);
 						CELL cell = Coord_Cell(offset);
 						if ((unsigned)cell < MAP_CELL_TOTAL) {
 							Map[cell].Flag.Occupy.Vehicle = value;
 						}
 					}
 				}
 			}
 		}
 		CELL cell = Coord_Cell(headto);
 		if ((unsigned)cell < MAP_CELL_TOTAL) {
 			Map[cell].Flag.Occupy.Vehicle = value;
 		}
 	}
 }
 
 
 /***********************************************************************************************
  * DriveClass::Offload_Tiberium_Bail -- Offloads one Tiberium quantum from the object.         *
  *                                                                                             *
  *    This routine will offload one Tiberium packet/quantum/bail from the object. Multiple     *
  *    calls to this routine are needed in order to fully offload all Tiberium.                 *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  Returns with the number of credits offloaded for the one call. If zero is returned,*
  *          then this indicates that all Tiberium has been offloaded.                          *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   07/19/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 int DriveClass::Offload_Tiberium_Bail(void)
 {
 	if (Tiberium) {
 		Tiberium--;
 		if (House->IsHuman) {
 			return(UnitTypeClass::FULL_LOAD_CREDITS/UnitTypeClass::STEP_COUNT); // 25 in debugger
 		}
 
 		// MBL 05.14.2020: AI harvested credits fix for multiplayer, since they are miscalculated, and it's noticed
 		//
 		// return(UnitTypeClass::FULL_LOAD_CREDITS+(UnitTypeClass::FULL_LOAD_CREDITS/3)/UnitTypeClass::STEP_COUNT); 708 in debugger
 		//
 		if (GameToPlay == GAME_NORMAL) // Non-multiplayer game, keep the original calculation; 708 in debugger
 		{
 			return(UnitTypeClass::FULL_LOAD_CREDITS+(UnitTypeClass::FULL_LOAD_CREDITS/3)/UnitTypeClass::STEP_COUNT); // Original (708), wrong calcualation but preserving to not break missions
 		}
 		else // Multiplayer game, apply the 1/3 bonus credits correction, so not be as extreme; 33 in debugger
 		{
 			return((UnitTypeClass::FULL_LOAD_CREDITS+(UnitTypeClass::FULL_LOAD_CREDITS/3))/UnitTypeClass::STEP_COUNT); // Corrected calculation
 		}
 	}
 	return(0);
 }
 
 
 /***********************************************************************************************
  * DriveClass::Ok_To_Move -- Checks to see if this object can begin moving.                    *
  *                                                                                             *
  *    This routine is used to verify that this object is allowed to move. Some objects can     *
  *    be temporarily occupied and thus cannot move until the situation permits.                *
  *                                                                                             *
  * INPUT:   direction   -- The direction that movement would be desired.                       *
  *                                                                                             *
  * OUTPUT:  Can the unit move in the direction specified?                                      *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   07/29/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 bool DriveClass::Ok_To_Move(DirType ) const
 {
 	return true;
 }
 
 
 /***********************************************************************************************
  * DriveClass::Class_Of -- Fetches a reference to the class type for this object.              *
  *                                                                                             *
  *    This routine will fetch a reference to the TypeClass of this object.                     *
  *                                                                                             *
  * INPUT:   none                                                                               *
  *                                                                                             *
  * OUTPUT:  Returns with reference to the type class of this object.                           *
  *                                                                                             *
  * WARNINGS:   none                                                                            *
  *                                                                                             *
  * HISTORY:                                                                                    *
  *   07/29/1995 JLB : Created.                                                                 *
  *=============================================================================================*/
 ObjectTypeClass const & DriveClass::Class_Of(void) const
 {
 	return *Class;
 }
 
 
 /***************************************************************************
 **	Smooth turn track tables. These are coordinate offsets from the center
 **	of the destination cell. These are the raw tracks that are modified
 **	by negating the X and Y portions as necessary. Also for reverse travelling
 **	direction, the track list can be processed backward.
 **
 **	Track 1 = N
 **	Track 2 = NE
 **	Track 3 = N->NE 45 deg (double path consumption)
 **	Track 4 = N->E 90 deg (double path consumption)
 **	Track 5 = NE->SE 90 deg (double path consumption)
 ** Track 6 = NE->N 45 deg (double path consumption)
 **	Track 7 = N->NE (facing change only)
 **	Track 8 = NE->E (facing change only)
 **	Track 9 = N->E (facing change only)
 **	Track 10= NE->SE (facing change only)
 **	Track 11= back up into refinery
 **	Track 12= drive out of refinery
 */
 //#pragma warn -ias
 DriveClass::TrackType const DriveClass::Track1[24] = {
 	{0x00F50000L,(DirType)0},
 	{0x00EA0000L,(DirType)0},
 	{0x00DF0000L,(DirType)0},
 	{0x00D40000L,(DirType)0},
 	{0x00C90000L,(DirType)0},
 	{0x00BE0000L,(DirType)0},
 	{0x00B30000L,(DirType)0},
 	{0x00A80000L,(DirType)0},
 	{0x009D0000L,(DirType)0},
 	{0x00920000L,(DirType)0},
 	{0x00870000L,(DirType)0},
 	{0x007C0000L,(DirType)0},		// Track jump check here.
 	{0x00710000L,(DirType)0},
 	{0x00660000L,(DirType)0},
 	{0x005B0000L,(DirType)0},
 	{0x00500000L,(DirType)0},
 	{0x00450000L,(DirType)0},
 	{0x003A0000L,(DirType)0},
 	{0x002F0000L,(DirType)0},
 	{0x00240000L,(DirType)0},
 	{0x00190000L,(DirType)0},
 	{0x000E0000L,(DirType)0},
 	{0x00030000L,(DirType)0},
 	{0x00000000L,(DirType)0}
 };
 
 DriveClass::TrackType const DriveClass::Track2[] = {
 	{0x00F8FF08L,(DirType)32},
 	{0x00F0FF10L,(DirType)32},
 	{0x00E8FF18L,(DirType)32},
 	{0x00E0FF20L,(DirType)32},
 	{0x00D8FF28L,(DirType)32},
 	{0x00D0FF30L,(DirType)32},
 	{0x00C8FF38L,(DirType)32},
 	{0x00C0FF40L,(DirType)32},
 	{0x00B8FF48L,(DirType)32},
 	{0x00B0FF50L,(DirType)32},
 	{0x00A8FF58L,(DirType)32},
 	{0x00A0FF60L,(DirType)32},
 	{0x0098FF68L,(DirType)32},
 	{0x0090FF70L,(DirType)32},
 	{0x0088FF78L,(DirType)32},
 	{0x0080FF80L,(DirType)32},		// Track jump check here.
 	{0x0078FF88L,(DirType)32},
 	{0x0070FF90L,(DirType)32},
 	{0x0068FF98L,(DirType)32},
 	{0x0060FFA0L,(DirType)32},
 	{0x0058FFA8L,(DirType)32},
 	{0x0050FFB0L,(DirType)32},
 	{0x0048FFB8L,(DirType)32},
 	{0x0040FFC0L,(DirType)32},
 	{0x0038FFC8L,(DirType)32},
 	{0x0030FFD0L,(DirType)32},
 	{0x0028FFD8L,(DirType)32},
 	{0x0020FFE0L,(DirType)32},
 	{0x0018FFE8L,(DirType)32},
 	{0x0010FFF0L,(DirType)32},
 	{0x0008FFF8L,(DirType)32},
 	{0x00000000L,(DirType)32}
 };
 
 DriveClass::TrackType const DriveClass::Track3[] = {
 	{0x01F5FF00L,(DirType)0},
 	{0x01EAFF00L,(DirType)0},
 	{0x01DFFF00L,(DirType)0},
 	{0x01D4FF00L,(DirType)0},
 	{0x01C9FF00L,(DirType)0},
 	{0x01BEFF00L,(DirType)0},
 	{0x01B3FF00L,(DirType)0},
 	{0x01A8FF00L,(DirType)0},
 	{0x019DFF00L,(DirType)0},
 	{0x0192FF00L,(DirType)0},
 	{0x0187FF00L,(DirType)0},
 	{0x0180FF00L,(DirType)0},
 	{0x0175FF00L,(DirType)0},		// Jump entry point here.
 	{0x016BFF00L,(DirType)0},
 	{0x0160FF02L,(DirType)1},
 	{0x0155FF04L,(DirType)3},
 	{0x014CFF06L,(DirType)4},
 	{0x0141FF08L,(DirType)5},
 	{0x0137FF0BL,(DirType)7},
 	{0x012EFF0FL,(DirType)8},
 	{0x0124FF13L,(DirType)9},
 	{0x011AFF17L,(DirType)11},
 	{0x0110FF1BL,(DirType)12},
 	{0x0107FF1FL,(DirType)13},		// Center cell processing here.
 	{0x00FCFF24L,(DirType)15},
 	{0x00F3FF28L,(DirType)16},
 	{0x00ECFF2CL,(DirType)17},
 	{0x00E0FF32L,(DirType)19},
 	{0x00D7FF36L,(DirType)20},
 	{0x00CFFF3DL,(DirType)21},
 	{0x00C6FF42L,(DirType)23},
 	{0x00BAFF49L,(DirType)24},
 	{0x00B0FF4DL,(DirType)25},
 	{0x00A8FF58L,(DirType)27},
 	{0x00A0FF60L,(DirType)28},
 	{0x0098FF68L,(DirType)29},
 	{0x0090FF70L,(DirType)31},
 	{0x0088FF78L,(DirType)32},
 	{0x0080FF80L,(DirType)32},		// Track jump check here.
 	{0x0078FF88L,(DirType)32},
 	{0x0070FF90L,(DirType)32},
 	{0x0068FF98L,(DirType)32},
 	{0x0060FFA0L,(DirType)32},
 	{0x0058FFA8L,(DirType)32},
 	{0x0050FFB0L,(DirType)32},
 	{0x0048FFB8L,(DirType)32},
 	{0x0040FFC0L,(DirType)32},
 	{0x0038FFC8L,(DirType)32},
 	{0x0030FFD0L,(DirType)32},
 	{0x0028FFD8L,(DirType)32},
 	{0x0020FFE0L,(DirType)32},
 	{0x0018FFE8L,(DirType)32},
 	{0x0010FFF0L,(DirType)32},
 	{0x0008FFF8L,(DirType)32},
 	{0x00000000L,(DirType)32}
 };
 
 DriveClass::TrackType const DriveClass::Track4[] = {
 	{0x00F5FF00L,(DirType)0},
 	{0x00EBFF00L,(DirType)0},
 	{0x00E0FF00L,(DirType)0},
 	{0x00D5FF00L,(DirType)0},
 	{0x00CBFF01L,(DirType)0},
 	{0x00C0FF03L,(DirType)0},
 	{0x00B5FF05L,(DirType)1},
 	{0x00ABFF07L,(DirType)1},
 	{0x00A0FF0AL,(DirType)2},
 	{0x0095FF0DL,(DirType)3},
 	{0x008BFF10L,(DirType)4},
 	{0x0080FF14L,(DirType)5},		// Track entry here.
 	{0x0075FF18L,(DirType)8},
 	{0x006DFF1CL,(DirType)12},
 	{0x0063FF22L,(DirType)16},
 	{0x005AFF25L,(DirType)20},
 	{0x0052FF2BL,(DirType)23},
 	{0x0048FF32L,(DirType)27},
 	{0x0040FF37L,(DirType)32},
 	{0x0038FF3DL,(DirType)36},
 	{0x0030FF46L,(DirType)39},
 	{0x002BFF4FL,(DirType)43},
 	{0x0024FF58L,(DirType)47},
 	{0x0020FF60L,(DirType)51},
 	{0x001BFF6DL,(DirType)54},
 	{0x0017FF79L,(DirType)57},
 	{0x0014FF82L,(DirType)60},		// Track jump here.
 	{0x0011FF8FL,(DirType)62},
 	{0x000DFF98L,(DirType)63},
 	{0x0009FFA2L,(DirType)64},
 	{0x0006FFACL,(DirType)64},
 	{0x0004FFB5L,(DirType)66},
 	{0x0003FFC0L,(DirType)64},
 	{0x0002FFCBL,(DirType)64},
 	{0x0001FFD5L,(DirType)64},
 	{0x0000FFE0L,(DirType)64},
 	{0x0000FFEBL,(DirType)64},
 	{0x0000FFF5L,(DirType)64},
 	{0x00000000L,(DirType)64}
 };
 
 DriveClass::TrackType const DriveClass::Track5[] = {
 	{0xFFF8FE08L,(DirType)32},
 	{0xFFF0FE10L,(DirType)32},
 	{0xFFE8FE18L,(DirType)32},
 	{0xFFE0FE20L,(DirType)32},
 	{0xFFD8FE28L,(DirType)32},
 	{0xFFD0FE30L,(DirType)32},
 	{0xFFC8FE38L,(DirType)32},
 	{0xFFC0FE40L,(DirType)32},
 	{0xFFB8FE48L,(DirType)32},
 	{0xFFB0FE50L,(DirType)32},
 	{0xFFA8FE58L,(DirType)32},
 	{0xFFA0FE60L,(DirType)32},
 	{0xFF98FE68L,(DirType)32},
 	{0xFF90FE70L,(DirType)32},
 	{0xFF88FE78L,(DirType)32},
 	{0xFF80FE80L,(DirType)32},		// Track entry here.
 	{0xFF78FE88L,(DirType)32},
 	{0xFF71FE90L,(DirType)32},
 	{0xFF6AFE97L,(DirType)32},
 	{0xFF62FE9FL,(DirType)32},
 	{0xFF5AFEA8L,(DirType)32},
 	{0xFF53FEB0L,(DirType)35},
 	{0xFF4BFEB7L,(DirType)38},
 	{0xFF44FEBEL,(DirType)41},
 	{0xFF3EFEC4L,(DirType)44},
 	{0xFF39FECEL,(DirType)47},
 	{0xFF34FED8L,(DirType)50},
 	{0xFF30FEE0L,(DirType)53},
 	{0xFF2DFEEBL,(DirType)56},
 	{0xFF2CFEF5L,(DirType)59},
 	{0xFF2BFF00L,(DirType)62},
 	{0xFF2CFF0BL,(DirType)66},
 	{0xFF2DFF15L,(DirType)69},
 	{0xFF30FF1FL,(DirType)72},
 	{0xFF34FF28L,(DirType)75},
 	{0xFF39FF30L,(DirType)78},
 	{0xFF3EFF3AL,(DirType)81},
 	{0xFF44FF44L,(DirType)84},
 	{0xFF4BFF4BL,(DirType)87},
 	{0xFF53FF50L,(DirType)90},
 	{0xFF5AFF58L,(DirType)93},
 	{0xFF62FF60L,(DirType)96},
 	{0xFF6AFF68L,(DirType)96},
 	{0xFF71FF70L,(DirType)96},
 	{0xFF78FF78L,(DirType)96},
 	{0xFF80FF80L,(DirType)96},		// Track jump check here.
 	{0xFF88FF88L,(DirType)96},
 	{0xFF90FF90L,(DirType)96},
 	{0xFF98FF98L,(DirType)96},
 	{0xFFA0FFA0L,(DirType)96},
 	{0xFFA8FFA8L,(DirType)96},
 	{0xFFB0FFB0L,(DirType)96},
 	{0xFFB8FFB8L,(DirType)96},
 	{0xFFC0FFC0L,(DirType)96},
 	{0xFFC8FFC8L,(DirType)96},
 	{0xFFD0FFD0L,(DirType)96},
 	{0xFFD8FFD8L,(DirType)96},
 	{0xFFE0FFE0L,(DirType)96},
 	{0xFFE8FFE8L,(DirType)96},
 	{0xFFF0FFF0L,(DirType)96},
 	{0xFFF8FFF8L,(DirType)96},
 	{0x00000000L,(DirType)96}
 };
 
 DriveClass::TrackType const DriveClass::Track6[] = {
 	{0x0100FE00L,(DirType)32},
 	{0x00F8FE08L,(DirType)32},
 	{0x00F0FE10L,(DirType)32},
 	{0x00E8FE18L,(DirType)32},
 	{0x00E0FE20L,(DirType)32},
 	{0x00D8FE28L,(DirType)32},
 	{0x00D0FE30L,(DirType)32},
 	{0x00C8FE38L,(DirType)32},
 	{0x00C0FE40L,(DirType)32},
 	{0x00B8FE48L,(DirType)32},
 	{0x00B0FE50L,(DirType)32},
 	{0x00A8FE58L,(DirType)32},
 	{0x00A0FE60L,(DirType)32},
 	{0x0098FE68L,(DirType)32},
 	{0x0090FE70L,(DirType)32},
 	{0x0088FE78L,(DirType)32},
 	{0x0080FE80L,(DirType)32},		// Jump entry point here.
 	{0x0078FE88L,(DirType)32},
 	{0x0070FE90L,(DirType)32},
 	{0x0068FE98L,(DirType)32},
 	{0x0060FEA0L,(DirType)32},
 	{0x0058FEA8L,(DirType)32},
 	{0x0055FEAEL,(DirType)32},
 	{0x004EFEB8L,(DirType)35},
 	{0x0048FEC0L,(DirType)37},
 	{0x0042FEC9L,(DirType)40},
 	{0x003BFED2L,(DirType)43},
 	{0x0037FEDAL,(DirType)45},
 	{0x0032FEE3L,(DirType)48},
 	{0x002BFEEBL,(DirType)51},
 	{0x0026FEF5L,(DirType)53},
 	{0x0022FEFEL,(DirType)56},
 	{0x001CFF08L,(DirType)59},
 	{0x0019FF12L,(DirType)61},
 	{0x0015FF1BL,(DirType)64},
 	{0x0011FF26L,(DirType)64},
 	{0x000EFF30L,(DirType)64},
 	{0x000BFF39L,(DirType)64},
 	{0x0009FF43L,(DirType)64},
 	{0x0007FF4EL,(DirType)64},
 	{0x0005FF57L,(DirType)64},
 	{0x0003FF62L,(DirType)64},
 	{0x0001FF6DL,(DirType)64},
 	{0x0000FF77L,(DirType)64},
 	{0x0000FF80L,(DirType)64},		// Track jump check here.
 	{0x0000FF8BL,(DirType)64},
 	{0x0000FF95L,(DirType)64},
 	{0x0000FFA0L,(DirType)64},
 	{0x0000FFABL,(DirType)64},
 	{0x0000FFB5L,(DirType)64},
 	{0x0000FFC0L,(DirType)64},
 	{0x0000FFCBL,(DirType)64},
 	{0x0000FFD5L,(DirType)64},
 	{0x0000FFE0L,(DirType)64},
 	{0x0000FFEBL,(DirType)64},
 	{0x0000FFF5L,(DirType)64},
 	{0x00000000L,(DirType)64}
 };
 
 DriveClass::TrackType const DriveClass::Track7[] = {
 	{0x0006FFFFL,(DirType)0},
 	{0x000CFFFEL,(DirType)4},
 	{0x0011FFFCL,(DirType)8},
 	{0x0018FFFAL,(DirType)12},
 	{0x001FFFF6L,(DirType)16},
 	{0x0024FFF3L,(DirType)19},
 	{0x002BFFF0L,(DirType)22},
 	{0x0030FFFDL,(DirType)23},
 	{0x0035FFEBL,(DirType)24},
 	{0x0038FFE8L,(DirType)25},
 	{0x003CFFE6L,(DirType)26},
 	{0x0040FFE3L,(DirType)27},
 	{0x0043FFE0L,(DirType)28},
 	{0x0046FFDDL,(DirType)29},
 	{0x0043FFDFL,(DirType)30},
 	{0x0040FFE1L,(DirType)30},
 	{0x003CFFE3L,(DirType)30},
 	{0x0038FFE5L,(DirType)30},
 	{0x0035FFE7L,(DirType)31},
 	{0x0030FFE9L,(DirType)31},
 	{0x002BFFEBL,(DirType)31},
 	{0x0024FFEDL,(DirType)31},
 	{0x001FFFF1L,(DirType)31},
 	{0x0018FFF4L,(DirType)32},
 	{0x0011FFF7L,(DirType)32},
 	{0x000CFFFAL,(DirType)32},
 	{0x0006FFFDL,(DirType)32},
 	{0x00000000L,(DirType)32}
 };
 
 DriveClass::TrackType const DriveClass::Track8[] = {
 	{0x0003FFFCL,(DirType)32},
 	{0x0006FFF7L,(DirType)36},
 	{0x000AFFF1L,(DirType)40},
 	{0x000CFFEBL,(DirType)44},
 	{0x000DFFE4L,(DirType)46},
 	{0x000EFFDCL,(DirType)48},
 	{0x000FFFD5L,(DirType)50},
 	{0x0010FFD0L,(DirType)52},
 	{0x0011FFC9L,(DirType)54},
 	{0x0012FFC2L,(DirType)56},
 	{0x0011FFC0L,(DirType)58},
 	{0x0010FFC2L,(DirType)60},
 	{0x000EFFC9L,(DirType)62},
 	{0x000CFFCFL,(DirType)64},
 	{0x000AFFD5L,(DirType)64},
 	{0x0008FFDAL,(DirType)64},
 	{0x0006FFE2L,(DirType)64},
 	{0x0004FFE9L,(DirType)64},
 	{0x0002FFEFL,(DirType)64},
 	{0x0001FFF5L,(DirType)64},
 	{0x0000FFF9L,(DirType)64},
 	{0x00000000L,(DirType)64}
 };
 
 DriveClass::TrackType const DriveClass::Track9[] = {
 	{0xFFF50002L,(DirType)0},
 	{0xFFEB0004L,(DirType)2},
 	{0xFFE00006L,(DirType)4},
 	{0xFFD50009L,(DirType)6},
 	{0xFFCE000CL,(DirType)9},
 	{0xFFC8000FL,(DirType)11},
 	{0xFFC00012L,(DirType)13},
 	{0xFFB80015L,(DirType)16},
 	{0xFFC00012L,(DirType)18},
 	{0xFFC8000EL,(DirType)20},
 	{0xFFCE000AL,(DirType)22},
 	{0xFFD50004L,(DirType)24},
 	{0xFFDE0000L,(DirType)26},
 	{0xFFE9FFF8L,(DirType)28},
 	{0xFFEEFFF2L,(DirType)30},
 	{0xFFF5FFEBL,(DirType)32},
 	{0xFFFDFFE1L,(DirType)34},
 	{0x0002FFD8L,(DirType)36},
 	{0x0007FFD2L,(DirType)39},
 	{0x000BFFCBL,(DirType)41},
 	{0x0010FFC5L,(DirType)43},
 	{0x0013FFBEL,(DirType)45},
 	{0x0015FFB7L,(DirType)48},
 	{0x0013FFBEL,(DirType)50},
 	{0x0011FFC5L,(DirType)52},
 	{0x000BFFCCL,(DirType)54},
 	{0x0008FFD4L,(DirType)56},
 	{0x0005FFDFL,(DirType)58},
 	{0x0003FFEBL,(DirType)62},
 	{0x0001FFF5L,(DirType)64},
 	{0x00000000L,(DirType)64}
 };
 
 DriveClass::TrackType const DriveClass::Track10[] = {
 	{0xFFF6000BL,(DirType)32},
 	{0xFFF00015L,(DirType)37},
 	{0xFFEB0020L,(DirType)42},
 	{0xFFE9002BL,(DirType)47},
 	{0xFFE50032L,(DirType)52},
 	{0xFFE30038L,(DirType)57},
 	{0xFFE00040L,(DirType)60},
 	{0xFFE20038L,(DirType)62},
 	{0xFFE40032L,(DirType)64},
 	{0xFFE5002AL,(DirType)68},
 	{0xFFE6001EL,(DirType)70},
 	{0xFFE70015L,(DirType)72},
 	{0xFFE8000BL,(DirType)74},
 	{0xFFE90000L,(DirType)76},
 	{0xFFE8FFF5L,(DirType)78},
 	{0xFFE7FFEBL,(DirType)80},
 	{0xFFE6FFE0L,(DirType)82},
 	{0xFFE5FFD5L,(DirType)84},
 	{0xFFE4FFCEL,(DirType)86},
 	{0xFFE2FFC5L,(DirType)88},
 	{0xFFE0FFC0L,(DirType)90},
 	{0xFFE3FFC5L,(DirType)92},
 	{0xFFE5FFCEL,(DirType)94},
 	{0xFFE9FFD5L,(DirType)95},
 	{0xFFEBFFE0L,(DirType)96},
 	{0xFFF0FFEBL,(DirType)96},
 	{0xFFF6FFF5L,(DirType)96},
 	{0x00000000L,(DirType)96}
 };
 
 DriveClass::TrackType const DriveClass::Track11[] = {
 	{0x01000000L,DIR_SW},
 	{0x00F30008L,DIR_SW},
 	{0x00E50010L,DIR_SW_X1},
 	{0x00D60018L,DIR_SW_X1},
 	{0x00C80020L,DIR_SW_X1},
 	{0x00B90028L,DIR_SW_X1},
 	{0x00AB0030L,DIR_SW_X2},
 	{0x009C0038L,DIR_SW_X2},
 	{0x008D0040L,DIR_SW_X2},
 	{0x007F0048L,DIR_SW_X2},
 	{0x00710050L,DIR_SW_X2},
 	{0x00640058L,DIR_SW_X2},
 	{0x00550060L,DIR_SW_X2},
 
 	{0x00000000L,DIR_SW_X2}
 };
 
 DriveClass::TrackType const DriveClass::Track12[] = {
 	{0xFF550060L,DIR_SW_X2},
 	{0xFF640058L,DIR_SW_X2},
 	{0xFF710050L,DIR_SW_X2},
 	{0xFF7F0048L,DIR_SW_X2},
 	{0xFF8D0040L,DIR_SW_X2},
 	{0xFF9C0038L,DIR_SW_X2},
 	{0xFFAB0030L,DIR_SW_X2},
 	{0xFFB90028L,DIR_SW_X1},
 	{0xFFC80020L,DIR_SW_X1},
 	{0xFFD60018L,DIR_SW_X1},
 	{0xFFE50010L,DIR_SW_X1},
 	{0xFFF30008L,DIR_SW},
 
 	{0x00000000L,DIR_SW}
 };
 
 /*
 **	Drive out of weapon's factory.
 */
 DriveClass::TrackType const DriveClass::Track13[] = {
 	{XYP_COORD(10,-21),(DirType)(DIR_SW-10)},
 	{XYP_COORD(10,-21),(DirType)(DIR_SW-10)},
 	{XYP_COORD(10,-20),(DirType)(DIR_SW-10)},
 	{XYP_COORD(10,-20),(DirType)(DIR_SW-10)},
 	{XYP_COORD(9,-18),(DirType)(DIR_SW-10)},
 	{XYP_COORD(9,-18),(DirType)(DIR_SW-10)},
 	{XYP_COORD(9,-17),(DirType)(DIR_SW-10)},
 	{XYP_COORD(8,-16),(DirType)(DIR_SW-10)},
 	{XYP_COORD(8,-15),(DirType)(DIR_SW-10)},
 	{XYP_COORD(7,-14),(DirType)(DIR_SW-10)},
 	{XYP_COORD(7,-13),(DirType)(DIR_SW-10)},
 	{XYP_COORD(6,-12),(DirType)(DIR_SW-10)},
 	{XYP_COORD(6,-11),(DirType)(DIR_SW-10)},
 	{XYP_COORD(5,-10),(DirType)(DIR_SW-10)},
 	{XYP_COORD(5,-9),(DirType)(DIR_SW-10)},
 	{XYP_COORD(4,-8),(DirType)(DIR_SW-10)},
 	{XYP_COORD(4,-7),(DirType)(DIR_SW-10)},
 	{XYP_COORD(3,-6),(DirType)(DIR_SW-10)},
 	{XYP_COORD(3,-5),(DirType)(DIR_SW-9)},
 	{XYP_COORD(2,-4),(DirType)(DIR_SW-7)},
 	{XYP_COORD(2,-3),(DirType)(DIR_SW-5)},
 	{XYP_COORD(1,-2),(DirType)(DIR_SW-3)},
 	{XYP_COORD(1,-1),(DirType)(DIR_SW-1)},
 
 	{0x00000000L,DIR_SW}
 };
 
 
 /*
 **	There are a limited basic number of tracks that a vehicle can follow. These
 **	are they. Each track can be interpreted differently but this is controlled
 **	by the TrackControl structure elaborated elsewhere.
 */
 DriveClass::RawTrackType const DriveClass::RawTracks[13] = {
 	{Track1, -1, 0, -1},
 	{Track2, -1, 0, -1},
 	{Track3, 37, 12, 22},
 	{Track4, 26, 11, 19},
 	{Track5, 45, 15, 31},
 	{Track6, 44, 16, 27},
 	{Track7, -1, 0, -1},
 	{Track8, -1, 0, -1},
 	{Track9, -1, 0, -1},
 	{Track10, -1, 0, -1},
 	{Track11, -1, 0, -1},
 	{Track12, -1, 0, -1},
 	{Track13, -1, 0, -1}
 };
 
 
 /***************************************************************************
 **	Smooth turning control table. Given two directions in a path list, this
 **	table determines which track to use and what modifying operations need
 **	be performed on the track data.
 */
 DriveClass::TurnTrackType const DriveClass::TrackControl[67] = {
 	{1,	0,		DIR_N,	F_},																//	0-0
 	{3,	7,		DIR_NE,	F_D},																//	0-1 (raw chart)
 	{4,	9,		DIR_E,	F_D},																//	0-2 (raw chart)
 	{0,	0,		DIR_SE,	F_},																//	0-3 !
 	{0,	0,		DIR_S,	F_},																//	0-4 !
 	{0,	0,		DIR_SW,	F_},																//	0-5 !
 	{4,	9,		DIR_W,	(DriveClass::TrackControlType)(F_X|F_D)},				//	0-6
 	{3,	7,		DIR_NW,	(DriveClass::TrackControlType)(F_X|F_D)},				//	0-7
 	{6,	8,		DIR_N,	(DriveClass::TrackControlType)(F_T|F_X|F_Y|F_D)},	//	1-0
 	{2,	0,		DIR_NE,	F_},																//	1-1 (raw chart)
 	{6,	8,		DIR_E,	F_D},																//	1-2 (raw chart)
 	{5,	10,	DIR_SE,	F_D},																//	1-3 (raw chart)
 	{0,	0,		DIR_S,	F_},																//	1-4 !
 	{0,	0,		DIR_SW,	F_},																//	1-5 !
 	{0,	0,		DIR_W,	F_},																//	1-6 !
 	{5,	10,	DIR_NW,	(DriveClass::TrackControlType)(F_T|F_X|F_Y|F_D)},	//	1-7
 	{4,	9,		DIR_N,	(DriveClass::TrackControlType)(F_T|F_X|F_Y|F_D)},	//	2-0
 	{3,	7,		DIR_NE,	(DriveClass::TrackControlType)(F_T|F_X|F_Y|F_D)},	//	2-1
 	{1,	0,		DIR_E,	(DriveClass::TrackControlType)(F_T|F_X)},				//	2-2
 	{3,	7,		DIR_SE,	(DriveClass::TrackControlType)(F_T|F_X|F_D)},		//	2-3
 	{4,	9,		DIR_S,	(DriveClass::TrackControlType)(F_T|F_X|F_D)},		//	2-4
 	{0,	0,		DIR_SW,	F_},																//	2-5 !
 	{0,	0,		DIR_W,	F_},																//	2-6 !
 	{0,	0,		DIR_NW,	F_},																//	2-7 !
 	{0,	0,		DIR_N,	F_},																//	3-0 !
 	{5,	10,	DIR_NE,	(DriveClass::TrackControlType)(F_Y|F_D)},				//	3-1
 	{6,	8,		DIR_E,	(DriveClass::TrackControlType)(F_Y|F_D)},				//	3-2
 	{2,	0,		DIR_SE,	F_Y},																//	3-3
 	{6,	8,		DIR_S,	(DriveClass::TrackControlType)(F_T|F_X|F_D)},		//	3-4
 	{5,	10,	DIR_SW,	(DriveClass::TrackControlType)(F_T|F_X|F_D)},		//	3-5
 	{0,	0,		DIR_W,	F_},																//	3-6 !
 	{0,	0,		DIR_NW,	F_},																//	3-7 !
 	{0,	0,		DIR_N,	F_},																//	4-0 !
 	{0,	0,		DIR_NE,	F_},																//	4-1 !
 	{4,	9,		DIR_E,	(DriveClass::TrackControlType)(F_Y|F_D)},				//	4-2
 	{3,	7,		DIR_SE,	(DriveClass::TrackControlType)(F_Y|F_D)},				//	4-3
 	{1,	0,		DIR_S,	F_Y},																//	4-4
 	{3,	7,		DIR_SW,	(DriveClass::TrackControlType)(F_X|F_Y|F_D)},		//	4-5
 	{4,	9,		DIR_W,	(DriveClass::TrackControlType)(F_X|F_Y|F_D)},		//	4-6
 	{0,	0,		DIR_NW,	F_},																//	4-7 !
 	{0,	0,		DIR_N,	F_},																//	5-0 !
 	{0,	0,		DIR_NE,	F_},																//	5-1 !
 	{0,	0,		DIR_E,	F_},																//	5-2 !
 	{5,	10,	DIR_SE,	(DriveClass::TrackControlType)(F_T|F_D)},				//	5-3
 	{6,	8,		DIR_S,	(DriveClass::TrackControlType)(F_T|F_D)},				//	5-4
 	{2,	0,		DIR_SW,	F_T},																//	5-5
 	{6,	8,		DIR_W,	(DriveClass::TrackControlType)(F_X|F_Y|F_D)},		//	5-6
 	{5,	10,	DIR_NW,	(DriveClass::TrackControlType)(F_X|F_Y|F_D)},		//	5-7
 	{4,	9,		DIR_N,	(DriveClass::TrackControlType)(F_T|F_Y|F_D)},		//	6-0
 	{0,	0,		DIR_NE,	F_},																//	6-1 !
 	{0,	0,		DIR_E,	F_},																//	6-2 !
 	{0,	0,		DIR_SE,	F_},																//	6-3 !
 	{4,	9,		DIR_S,	(DriveClass::TrackControlType)(F_T|F_D)},				//	6-4
 	{3,	7,		DIR_SW,	(DriveClass::TrackControlType)(F_T|F_D)},				//	6-5
 	{1,	0,		DIR_W,	F_T},																//	6-6
 	{3,	7,		DIR_NW,	(DriveClass::TrackControlType)(F_T|F_Y|F_D)},		//	6-7
 	{6,	8,		DIR_N,	(DriveClass::TrackControlType)(F_T|F_Y|F_D)},		//	7-0
 	{5,	10,	DIR_NE,	(DriveClass::TrackControlType)(F_T|F_Y|F_D)},		//	7-1
 	{0,	0,		DIR_E,	F_},																//	7-2 !
 	{0,	0,		DIR_SE,	F_},																//	7-3 !
 	{0,	0,		DIR_S,	F_},																//	7-4 !
 	{5,	10,	DIR_SW,	(DriveClass::TrackControlType)(F_X|F_D)},				//	7-5
 	{6,	8,		DIR_W,	(DriveClass::TrackControlType)(F_X|F_D)},				//	7-6
 	{2,	0,		DIR_NW,	F_X},																//	7-7
 
 	{11,	11,	DIR_SW,	F_},																// Backup harvester into refinery.
 	{12,	12,	DIR_SW_X2,	F_},															// Drive back into refinery.
 	{13,	13,	DIR_SW,	F_}																// Drive out of weapons factory.
 };