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/* $Id$ */
/** @file yapf_destrail.hpp Determining the destination for rail vehicles. */
#ifndef YAPF_DESTRAIL_HPP
#define YAPF_DESTRAIL_HPP
class CYapfDestinationRailBase
{
protected:
RailTypes m_compatible_railtypes;
public:
void SetDestination(Vehicle* v)
{
m_compatible_railtypes = v->u.rail.compatible_railtypes;
}
bool IsCompatibleRailType(RailType rt)
{
return HasBit(m_compatible_railtypes, rt);
}
};
template <class Types>
class CYapfDestinationAnyDepotRailT
: public CYapfDestinationRailBase
{
public:
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
/// to access inherited path finder
Tpf& Yapf() {return *static_cast<Tpf*>(this);}
/// Called by YAPF to detect if node ends in the desired destination
FORCEINLINE bool PfDetectDestination(Node& n)
{
return PfDetectDestination(n.GetLastTile(), n.GetLastTrackdir());
}
/// Called by YAPF to detect if node ends in the desired destination
FORCEINLINE bool PfDetectDestination(TileIndex tile, Trackdir td)
{
bool bDest = IsRailDepotTile(tile);
return bDest;
}
/** Called by YAPF to calculate cost estimate. Calculates distance to the destination
* adds it to the actual cost from origin and stores the sum to the Node::m_estimate */
FORCEINLINE bool PfCalcEstimate(Node& n)
{
n.m_estimate = n.m_cost;
return true;
}
};
template <class Types>
class CYapfDestinationTileOrStationRailT
: public CYapfDestinationRailBase
{
public:
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
protected:
TileIndex m_destTile;
TrackdirBits m_destTrackdirs;
StationID m_dest_station_id;
/// to access inherited path finder
Tpf& Yapf() {return *static_cast<Tpf*>(this);}
static TileIndex CalcStationCenterTile(StationID station)
{
const Station* st = GetStation(station);
uint x = TileX(st->train_tile) + st->trainst_w / 2;
uint y = TileY(st->train_tile) + st->trainst_h / 2;
// return the tile of our target coordinates
return TileXY(x, y);
}
public:
void SetDestination(Vehicle* v)
{
switch (v->current_order.GetType()) {
case OT_GOTO_STATION:
m_destTile = CalcStationCenterTile(v->current_order.GetDestination());
m_dest_station_id = v->current_order.GetDestination();
m_destTrackdirs = INVALID_TRACKDIR_BIT;
break;
case OT_GOTO_WAYPOINT: {
Waypoint *wp = GetWaypoint(v->current_order.GetDestination());
if (wp == NULL) {
/* Invalid waypoint in orders! */
DEBUG(yapf, 0, "Invalid waypoint in orders == 0x%04X (train %d, player %d)", v->current_order.GetDestination(), v->unitnumber, (PlayerID)v->owner);
break;
}
m_destTile = wp->xy;
if (m_destTile != v->dest_tile) {
/* Something is wrong with orders! */
DEBUG(yapf, 0, "Invalid v->dest_tile == 0x%04X (train %d, player %d)", v->dest_tile, v->unitnumber, (PlayerID)v->owner);
}
m_dest_station_id = INVALID_STATION;
m_destTrackdirs = TrackToTrackdirBits(AxisToTrack(GetWaypointAxis(wp->xy)));
break;
}
default:
m_destTile = v->dest_tile;
m_dest_station_id = INVALID_STATION;
m_destTrackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(v->dest_tile, TRANSPORT_RAIL, 0));
break;
}
CYapfDestinationRailBase::SetDestination(v);
}
/// Called by YAPF to detect if node ends in the desired destination
FORCEINLINE bool PfDetectDestination(Node& n)
{
return PfDetectDestination(n.GetLastTile(), n.GetLastTrackdir());
}
/// Called by YAPF to detect if node ends in the desired destination
FORCEINLINE bool PfDetectDestination(TileIndex tile, Trackdir td)
{
bool bDest;
if (m_dest_station_id != INVALID_STATION) {
bDest = IsRailwayStationTile(tile)
&& (GetStationIndex(tile) == m_dest_station_id)
&& (GetRailStationTrack(tile) == TrackdirToTrack(td));
} else {
bDest = (tile == m_destTile)
&& ((m_destTrackdirs & TrackdirToTrackdirBits(td)) != TRACKDIR_BIT_NONE);
}
return bDest;
}
/** Called by YAPF to calculate cost estimate. Calculates distance to the destination
* adds it to the actual cost from origin and stores the sum to the Node::m_estimate */
FORCEINLINE bool PfCalcEstimate(Node& n)
{
static int dg_dir_to_x_offs[] = {-1, 0, 1, 0};
static int dg_dir_to_y_offs[] = {0, 1, 0, -1};
if (PfDetectDestination(n)) {
n.m_estimate = n.m_cost;
return true;
}
TileIndex tile = n.GetLastTile();
DiagDirection exitdir = TrackdirToExitdir(n.GetLastTrackdir());
int x1 = 2 * TileX(tile) + dg_dir_to_x_offs[(int)exitdir];
int y1 = 2 * TileY(tile) + dg_dir_to_y_offs[(int)exitdir];
int x2 = 2 * TileX(m_destTile);
int y2 = 2 * TileY(m_destTile);
int dx = abs(x1 - x2);
int dy = abs(y1 - y2);
int dmin = min(dx, dy);
int dxy = abs(dx - dy);
int d = dmin * YAPF_TILE_CORNER_LENGTH + (dxy - 1) * (YAPF_TILE_LENGTH / 2);
n.m_estimate = n.m_cost + d;
assert(n.m_estimate >= n.m_parent->m_estimate);
return true;
}
};
#endif /* YAPF_DESTRAIL_HPP */
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