void AIConstruction::SetFlagsAlongRoad(const noRoadNode& roadNode, Direction dir)
{
// does the roadsegment still exist?
const RoadSegment& roadSeg = *roadNode.GetRoute(dir);
bool isBwdDir = roadSeg.GetNodeID(roadNode);
MapPoint curPos = roadNode.GetPos();
// Skip first
curPos = aii.gwb.GetNeighbour(curPos, roadSeg.GetDir(isBwdDir, 0));
// Start after getting first neighbor (min distance == 2)
// and skip last 2 points (min distance and last is flag)
for(unsigned i = 1; i + 2 < roadSeg.GetLength(); ++i)
{
curPos = aii.gwb.GetNeighbour(curPos, roadSeg.GetDir(isBwdDir, i));
aii.SetFlag(curPos);
constructionlocations.push_back(curPos);
}
}
unsigned operator()(const noRoadNode& curNode, const unsigned char nextDir) const
{
// Im Warenmodus m�ssen wir Strafpunkte für �berlastete Tr�ger hinzuaddieren,
// damit der Algorithmus auch Ausweichrouten ausw�hlt
return curNode.GetPunishmentPoints(nextDir);
}
bool RoadPathFinder::FindPathImpl(const noRoadNode& start, const noRoadNode& goal,
const unsigned max,
const T_AdditionalCosts addCosts, const T_SegmentConstraints isSegmentAllowed,
unsigned* const length, unsigned char* const firstDir, MapPoint* const firstNodePos)
{
if(&start == &goal)
{
// Path where start==goal should never happen
RTTR_Assert(false);
LOG.write("WARNING: Bug detected (GF: %u). Please report this with the savegame and replay (Start==Goal in pathfinding %u,%u)\n") % gwb_.GetEvMgr().GetCurrentGF() % unsigned(start.GetX()) % unsigned(start.GetY());
// But for now we assume it to be valid and return (kind of) correct values
if(length)
*length = 0;
if(firstDir)
*firstDir = 0xff;
if(firstNodePos)
*firstNodePos = start.GetPos();
return true;
}
// increase current_visit_on_roads, so we don't have to clear the visited-states at every run
currentVisit++;
// if the counter reaches its maxium, tidy up
if (currentVisit == std::numeric_limits<unsigned>::max())
{
int w = gwb_.GetWidth();
int h = gwb_.GetHeight();
for(int y = 0; y < h; y++)
{
for(int x = 0; x < w; x++)
{
noRoadNode* const node = gwb_.GetSpecObj<noRoadNode>(MapPoint(x, y));
if(node)
node->last_visit = 0;
}
}
currentVisit = 1;
}
// Anfangsknoten einf�gen
todo.clear();
start.targetDistance = gwb_.CalcDistance(start.GetPos(), goal.GetPos());
start.estimate = start.targetDistance;
start.last_visit = currentVisit;
start.prev = NULL;
start.cost = 0;
start.dir_ = 0;
todo.push(&start);
while (!todo.empty())
{
// Knoten mit den geringsten Wegkosten ausw�hlen
const noRoadNode& best = *todo.pop();
// Ziel erreicht?
if (&best == &goal)
{
// Jeweils die einzelnen Angaben zur�ckgeben, falls gew�nscht (Pointer �bergeben)
if (length)
*length = best.cost;
// Backtrace to get the last node that is not the start node (has a prev node) --> Next node from start on path
const noRoadNode* firstNode = &best;
while(firstNode->prev != &start)
{
firstNode = firstNode->prev;
}
if (firstDir)
*firstDir = (unsigned char) firstNode->dir_;
if (firstNodePos)
*firstNodePos = firstNode->GetPos();
// Done, path found
return true;
}
// Nachbarflagge bzw. Wege in allen 6 Richtungen verfolgen
for (unsigned i = 0; i < 6; ++i)
{
// Gibt es auch einen solchen Weg bzw. Nachbarflagge?
noRoadNode* neighbour = best.GetNeighbour(i);
// Wenn nicht, brauchen wir mit dieser Richtung gar nicht weiter zu machen
if (!neighbour)
continue;
// this eliminates 1/6 of all nodes and avoids cost calculation and further checks,
// therefore - and because the profiler says so - it is more efficient that way
if (neighbour == best.prev)
continue;
// No pathes over buildings
if ((i == 1) && (neighbour != &goal))
{
// Flags and harbors are allowed
const GO_Type got = neighbour->GetGOT();
if(got != GOT_FLAG && got != GOT_NOB_HARBORBUILDING)
continue;
}
// evtl verboten?
if(!isSegmentAllowed(*best.routes[i]))
continue;
// Neuer Weg für diesen neuen Knoten berechnen
unsigned cost = best.cost + best.routes[i]->GetLength();
cost += addCosts(best, i);
if (cost > max)
continue;
// Was node already visited?
if (neighbour->last_visit == currentVisit)
{
// Dann nur ggf. Weg und Vorg�nger korrigieren, falls der Weg k�rzer ist
if (cost < neighbour->cost)
{
neighbour->cost = cost;
neighbour->prev = &best;
neighbour->estimate = neighbour->targetDistance + cost;
todo.rearrange(neighbour);
neighbour->dir_ = i;
}
}else
{
// Not visited yet -> Add to list
neighbour->last_visit = currentVisit;
neighbour->cost = cost;
neighbour->dir_ = i;
neighbour->prev = &best;
neighbour->targetDistance = gwb_.CalcDistance(neighbour->GetPos(), goal.GetPos());
neighbour->estimate = neighbour->targetDistance + cost;
todo.push(neighbour);
}
}
// Stehen wir hier auf einem Hafenplatz
if (best.GetGOT() == GOT_NOB_HARBORBUILDING)
{
std::vector<nobHarborBuilding::ShipConnection> scs = static_cast<const nobHarborBuilding&>(best).GetShipConnections();
for (unsigned i = 0; i < scs.size(); ++i)
{
// Neuer Weg für diesen neuen Knoten berechnen
unsigned cost = best.cost + scs[i].way_costs;
if (cost > max)
continue;
noRoadNode& dest = *scs[i].dest;
// Was node already visited?
if (dest.last_visit == currentVisit)
{
// Dann nur ggf. Weg und Vorg�nger korrigieren, falls der Weg k�rzer ist
if (cost < dest.cost)
{
dest.dir_ = SHIP_DIR;
dest.cost = cost;
dest.prev = &best;
dest.estimate = dest.targetDistance + cost;
todo.rearrange(&dest);
}
}else
{
// Not visited yet -> Add to list
dest.last_visit = currentVisit;
dest.dir_ = SHIP_DIR;
dest.prev = &best;
dest.cost = cost;
dest.targetDistance = gwb_.CalcDistance(dest.GetPos(), goal.GetPos());
dest.estimate = dest.targetDistance + cost;
todo.push(&dest);
}
}
}
}
// Liste leer und kein Ziel erreicht --> kein Weg
return false;
}
