X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flibr2c2%2Ftrainrouteplanner.cpp;h=22ac5400ea4fb050437ccdff14de77dbafc483e9;hb=b42a312323d36775ab550630b3ee818c3b948bf6;hp=809bb3e5c665967a9a6d6d890d7eb58f582c6e15;hpb=055d7e80b68c8f77ebf226ffd48c37a7e504940c;p=r2c2.git diff --git a/source/libr2c2/trainrouteplanner.cpp b/source/libr2c2/trainrouteplanner.cpp index 809bb3e..22ac540 100644 --- a/source/libr2c2/trainrouteplanner.cpp +++ b/source/libr2c2/trainrouteplanner.cpp @@ -21,145 +21,47 @@ TrainRoutePlanner::TrainRoutePlanner(Layout &layout) routed_trains.push_back(info); } - steps.push_back(RoutingStep()); - RoutingStep &start = steps.back(); + queue.push_back(RoutingStep()); + RoutingStep &start = queue.back(); for(vector::iterator i=routed_trains.begin(); i!=routed_trains.end(); ++i) start.trains.push_back(TrainRoutingState(*i)); + start.update_estimate(); } void TrainRoutePlanner::plan() { - RoutingStep *goal = 0; - for(list::iterator i=steps.begin(); i!=steps.end(); ++i) + const RoutingStep *goal = 0; + while(!queue.empty()) { - if(i->is_goal()) + const RoutingStep &step = get_step(); + if(step.is_goal()) { - goal = &*i; + goal = &step; break; } - if(update_states(*i)) - { - int next_train = find_next_train(*i); - if(next_train>=0) - add_steps(*i, next_train); - } + add_steps(step); } if(goal) create_routes(*goal); } -bool TrainRoutePlanner::update_states(RoutingStep &step) -{ - RoutingStep next(&step); - bool changes = false; - for(vector::iterator i=next.trains.begin(); i!=next.trains.end(); ++i) - { - TrainState old_state = i->state; - if(i->state==BLOCKED) - i->state = MOVING; - - TrackIter next_track = i->track.next(i->path); - if(!next_track) - return false; - - for(vector::iterator j=next.trains.begin(); j!=next.trains.end(); ++j) - if(j!=i) - { - if(j->track.track()==next_track.track()) - { - unsigned other_exit = j->track.reverse(j->path).entry(); - if(next_track.entry()==other_exit) - return false; - } - else if(!j->is_occupied(*next_track)) - continue; - - i->state = BLOCKED; - } - - if(i->state!=old_state) - changes = true; - } - - if(changes) - { - list::iterator i; - for(i=steps.begin(); (i!=steps.end() && !(next<*i)); ++i) ; - steps.insert(i, next); - } - - return !changes; -} - -int TrainRoutePlanner::find_next_train(RoutingStep &step) +const TrainRoutePlanner::RoutingStep &TrainRoutePlanner::get_step() { - Time::TimeDelta min_dt; - int next_train = -1; - for(unsigned i=0; i new_steps; - - RoutingStep next(&step); - next.advance(dt); - TrainRouter &router = *train.info->router; - if(train.waypoint<0 && router.is_destination(*train.track) && !router.is_destination(*next_track)) - { - next.trains[train_index].state = ARRIVED; - new_steps.push_back(next); - } - else - { - if(train.waypoint>=0 && router.is_waypoint(train.waypoint, *train.track) && !router.is_waypoint(train.waypoint, *next_track)) - { - ++next.trains[train_index].waypoint; - if(next.trains[train_index].waypoint>=static_cast(router.get_n_waypoints())) - next.trains[train_index].waypoint = -1; - } - - next.trains[train_index].advance_track(0); - - const TrackType::Endpoint &next_entry_ep = next_track.endpoint(); - for(unsigned i=0; next_entry_ep.paths>>i; ++i) - if(next_entry_ep.has_path(i)) - { - next.trains[train_index].path = i; - new_steps.push_back(next); - } - - if(next_entry_ep.paths!=next_track->get_type().get_paths()) - { - RoutingStep wait(&step); - wait.advance(dt); - wait.trains[train_index].state = WAITING; - new_steps.push_back(wait); - } - } - + step.create_successors(new_steps); new_steps.sort(); - steps.merge(new_steps); + queue.merge(new_steps); } -void TrainRoutePlanner::create_routes(RoutingStep &goal) +void TrainRoutePlanner::create_routes(const RoutingStep &goal) { for(vector::iterator i=routed_trains.begin(); i!=routed_trains.end(); ++i) { @@ -168,9 +70,9 @@ void TrainRoutePlanner::create_routes(RoutingStep &goal) i->route->set_temporary(true); } - for(RoutingStep *i=&goal; i; i=i->prev) + for(const RoutingStep *i=&goal; i; i=i->prev) { - for(vector::iterator j=i->trains.begin(); j!=i->trains.end(); ++j) + for(vector::const_iterator j=i->trains.begin(); j!=i->trains.end(); ++j) { if(j->state==WAITING || j->state==BLOCKED) j->info->waits.push_front(&*j); @@ -181,8 +83,8 @@ void TrainRoutePlanner::create_routes(RoutingStep &goal) for(vector::iterator i=routed_trains.begin(); i!=routed_trains.end(); ++i) { i->router->set_route(i->route); - TrainRoutingState *current_wait = 0; - for(list::iterator j=i->waits.begin(); j!=i->waits.end(); ++j) + const TrainRoutingState *current_wait = 0; + for(list::const_iterator j=i->waits.begin(); j!=i->waits.end(); ++j) if(!current_wait || (*j)->track.track()!=current_wait->track.track()) { Block &block = (*j)->track.next()->get_block(); @@ -239,7 +141,8 @@ TrainRoutePlanner::TrainRoutingState::TrainRoutingState(TrainRoutingInfo &inf): occupied_tracks(0), state(MOVING), delay(info->router->get_departure_delay()), - waypoint(info->router->get_n_waypoints() ? 0 : -1) + waypoint(info->router->get_n_waypoints() ? 0 : -1), + blocked_by(-1) { const Vehicle *veh = &info->train->get_vehicle(0); // TODO margins @@ -272,14 +175,15 @@ TrainRoutePlanner::TrainRoutingState::TrainRoutingState(const TrainRoutingState back_offset(other.back_offset), state(other.state), delay(other.delay), - waypoint(other.waypoint) + waypoint(other.waypoint), + blocked_by(other.blocked_by) { ++occupied_tracks->refcount; } TrainRoutePlanner::TrainRoutingState::~TrainRoutingState() { - if(!--occupied_tracks->refcount) + if(occupied_tracks && !--occupied_tracks->refcount) delete occupied_tracks; } @@ -288,7 +192,7 @@ Time::TimeDelta TrainRoutePlanner::TrainRoutingState::get_time_to_next_track() c return ((track->get_type().get_path_length(path)-offset)/info->speed)*Time::sec+delay; } -bool TrainRoutePlanner::TrainRoutingState::is_occupied(Track &trk) const +bool TrainRoutePlanner::TrainRoutingState::is_occupying(Track &trk) const { OccupiedTrack *occ = occupied_tracks; for(unsigned n=occ->n_tracks; n>0; --n, occ=occ->next) @@ -297,6 +201,26 @@ bool TrainRoutePlanner::TrainRoutingState::is_occupied(Track &trk) const return false; } +bool TrainRoutePlanner::TrainRoutingState::check_arrival() +{ + TrainRouter &router = *info->router; + TrackIter next_track = track.next(path); + + if(waypoint<0 && router.is_destination(*track) && !router.is_destination(*next_track)) + { + state = ARRIVED; + return true; + } + else if(waypoint>=0 && router.is_waypoint(waypoint, *track) && !router.is_waypoint(waypoint, *next_track)) + { + ++waypoint; + if(waypoint>=static_cast(router.get_n_waypoints())) + waypoint = -1; + } + + return false; +} + void TrainRoutePlanner::TrainRoutingState::advance(float distance) { offset += distance; @@ -334,12 +258,142 @@ TrainRoutePlanner::RoutingStep::RoutingStep(): prev(0) { } -TrainRoutePlanner::RoutingStep::RoutingStep(RoutingStep *p): +TrainRoutePlanner::RoutingStep::RoutingStep(const RoutingStep *p): time(p->time), trains(p->trains), prev(p) { } +void TrainRoutePlanner::RoutingStep::create_successors(list &new_steps) const +{ + RoutingStep next(this); + if(next.update_states()) + { + if(next.check_deadlocks()) + return; + + new_steps.push_back(next); + return; + } + + int train_index = find_next_train(); + if(train_index<0) + return; + + TrainRoutingState &train = next.trains[train_index]; + + Time::TimeDelta dt = train.get_time_to_next_track(); + next.advance(dt); + + if(train.check_arrival()) + { + new_steps.push_back(next); + return; + } + + TrackIter next_track = train.track.next(train.path); + train.advance_track(0); + + const TrackType::Endpoint &next_entry_ep = next_track.endpoint(); + for(unsigned i=0; next_entry_ep.paths>>i; ++i) + if(next_entry_ep.has_path(i)) + { + train.path = i; + if(next.is_viable()) + new_steps.push_back(next); + } + + if(next_entry_ep.paths!=next_track->get_type().get_paths()) + { + RoutingStep wait(this); + wait.advance(dt); + wait.trains[train_index].state = WAITING; + if(wait.is_viable()) + new_steps.push_back(wait); + } +} + +bool TrainRoutePlanner::RoutingStep::update_states() +{ + bool changes = false; + for(vector::iterator i=trains.begin(); i!=trains.end(); ++i) + { + if(i->state==ARRIVED) + continue; + + TrainState old_state = i->state; + + TrackIter next_track = i->track.next(i->path); + if(next_track) + { + i->blocked_by = get_occupant(*next_track); + if(i->blocked_by>=0) + i->state = BLOCKED; + else if(i->state==BLOCKED) + i->state = MOVING; + } + else + i->state = BLOCKED; + + if(i->state!=old_state) + changes = true; + } + + return changes; +} + +bool TrainRoutePlanner::RoutingStep::check_deadlocks() const +{ + for(vector::const_iterator i=trains.begin(); i!=trains.end(); ++i) + { + if(i->state!=BLOCKED) + continue; + + if(i->blocked_by<0) + return true; + + int slow = i->blocked_by; + int fast = trains[slow].blocked_by; + while(fast>=0 && trains[fast].blocked_by>=0) + { + if(fast==slow) + return true; + + slow = trains[slow].blocked_by; + fast = trains[trains[fast].blocked_by].blocked_by; + } + } + + return false; +} + +int TrainRoutePlanner::RoutingStep::get_occupant(Track &track) const +{ + for(unsigned i=0; i::const_iterator i=trains.begin(); i!=trains.end(); ++i) + if(i->state==MOVING) + return true; + + return false; +} + bool TrainRoutePlanner::RoutingStep::is_goal() const { for(vector::const_iterator i=trains.begin(); i!=trains.end(); ++i)