/// <summary>
/// Gets the next movement command - expects you to have confirmed there is a movement first
/// </summary>
/// <returns></returns>
public MovementCommandDirection GetNextMovementCommandDirection(bool bPeek = false)
{
if (movementQueue.Count <= 0)
{
throw new Exception("You have requested to GetNextMovementCommand but there are non left.");
}
MovementCommandDirection direction = movementQueue.Peek().Direction;
// calculate how many you will have left after you
int nRemaining = movementQueue.Peek().Iterations - 1;
Debug.Assert(nRemaining >= 0);
if (nRemaining == 0 && !bPeek)
{
// we are done with it, so let's toss it
movementQueue.Dequeue();
}
else if (!bPeek)
{
// we have more moves, but we are going to spend one
movementQueue.Peek().SpendSingleMovement();
}
return(direction);
}
/// <summary>
/// Construct a NonPlayerCharacterMovement
/// </summary>
/// <param name="nDialogIndex">the index of an NPC</param>
/// <param name="movementInstructionDataChunk">The full memory chunk of all movement instructions</param>
/// <param name="movementOffsetDataChunk">the full memory chunk of the movement offsets</param>
public NonPlayerCharacterMovement(int nDialogIndex, DataChunk movementInstructionDataChunk, DataChunk movementOffsetDataChunk)
{
// we totally ignore the first entry, since it's bad stuff
if (nDialogIndex == 0)
{
return;
}
this._movementInstructionDataChunk = movementInstructionDataChunk;
this._movementOffsetDataChunk = movementOffsetDataChunk;
this._nDialogIndex = nDialogIndex;
// todo: not a very efficient method of getting a UINT16 from the list -> it has to create a brand new list!
_nOffset = movementOffsetDataChunk.GetChunkAsUint16List() [nDialogIndex];
// if it has the value of 0xFFFF then it indicates there are currently no instructions
if (_nOffset == 0xFFFF)
{
return;
}
// calculate the offset
int nOffsetIndex = (nDialogIndex) * (MAX_COMMAND_LIST_ENTRIES * MAX_MOVEMENT_COMMAND_SIZE);
// get a copy because the GetAsByteList is an expensive method call
List <byte> rawData = movementInstructionDataChunk.GetAsByteList();
// gets a smaller version of it - much easier to keep track of
_loadedData = rawData.GetRange(nOffsetIndex, MAX_COMMAND_LIST_ENTRIES * 2);
int nIndex = _nOffset;
for (int i = 0; i < MAX_COMMAND_LIST_ENTRIES; i++)
{
byte nIterations = _loadedData[nIndex];
MovementCommandDirection direction = (MovementCommandDirection)_loadedData[nIndex + 1];
// if we have hit 0xFF then there is nothing else in the list and we can just return
if (nIterations == 0xFF || nIterations == 0)
{
return;
}
if (!(direction == MovementCommandDirection.East || direction == MovementCommandDirection.West || direction == MovementCommandDirection.North ||
direction == MovementCommandDirection.South))
{
throw new Ultima5ReduxException("a bad direction was set: " + direction.ToString());
}
// we have a proper movement instruction so let's add it to the queue
MovementCommand movementCommand = new MovementCommand(direction, nIterations);
//this.movementQueue.Enqueue(movementCommand);
AddNewMovementInstruction(movementCommand);
// we actually grab from the offset, but it is circular, so we need to mod it
nIndex = (nIndex + 2) % (MAX_COMMAND_LIST_ENTRIES * 2);
}
}
public MovementCommand(MovementCommandDirection direction, int iterations)
{
Iterations = iterations;
Direction = direction;
}