X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flibmarklin%2Froute.cpp;h=daa044f9b9b4054b774421df3e6ada5168f76c43;hb=e392d397f6b86a49a05e9738357ccbfc2a922f01;hp=40638d9683051fd3fa4581b14f3d6458d89d4880;hpb=6dc18b0e518407bd2a86602bae1e9bbae05da7c8;p=r2c2.git

diff --git a/source/libmarklin/route.cpp b/source/libmarklin/route.cpp
index 40638d9..daa044f 100644
--- a/source/libmarklin/route.cpp
+++ b/source/libmarklin/route.cpp
@@ -1,26 +1,235 @@
 /* $Id$
 
 This file is part of the MSP Märklin suite
-Copyright © 2007-2009  Mikkosoft Productions, Mikko Rasa
+Copyright © 2007-2010  Mikkosoft Productions, Mikko Rasa
 Distributed under the GPL
 */
 
+#include <queue>
+#include <msp/strings/formatter.h>
 #include "layout.h"
 #include "route.h"
 #include "track.h"
+#include "trackiter.h"
 #include "tracktype.h"
 
 using namespace std;
 using namespace Msp;
 
+namespace {
+
+using namespace Marklin;
+
+typedef std::pair<Track *, unsigned> Key;
+
+struct Node
+{
+	Track *track;
+	unsigned ep;
+	Node *prev;
+	float dist;
+
+	Node():
+		track(0), ep(0), prev(0), dist(0)
+	{ }
+
+	Node(Track &t, unsigned e):
+		track(&t), ep(e), prev(0), dist(0)
+	{ }
+
+	Node(Track &t, unsigned e, Node &r, float d):
+		track(&t), ep(e), prev(&r), dist(prev->dist+d)
+	{ }
+
+	bool operator<(const Node &other) const
+	{ return dist>other.dist; }
+};
+
+struct TrackMatch
+{
+	Track &track;
+
+	TrackMatch(Track &t): track(t) { }
+
+	bool operator()(Track &t) const { return &t==&track; }
+};
+
+struct TrackInSet
+{
+	const set<Track *> &tracks;
+
+	TrackInSet(const set<Track *> &t): tracks(t) { }
+
+	bool operator()(Track &t) const { return tracks.count(&t); }
+};
+
+template<typename Pred>
+list<Track *> dijkstra(Track &from, unsigned ep, const Pred &goal)
+{
+	map<Key, Node> track_nodes;
+	priority_queue<Node> nodes;
+	Node *final = 0;
+
+	nodes.push(Node(from, ep));
+
+	while(!nodes.empty())
+	{
+		Node lowest = nodes.top();
+		nodes.pop();
+
+		Key key(lowest.track, lowest.ep);
+		if(track_nodes.count(key))
+			continue;
+
+		Node &ref = track_nodes[key] = lowest;
+		if(goal(*lowest.track))
+		{
+			final = &ref;
+			break;
+		}
+
+		const TrackType &type = lowest.track->get_type();
+		const vector<TrackType::Endpoint> &eps = type.get_endpoints();
+		const vector<Track *> &links = lowest.track->get_links();
+		for(unsigned i=0; i<eps.size(); ++i)
+		{
+			if(i==lowest.ep || !links[i])
+				continue;
+
+			unsigned link_ep = links[i]->get_endpoint_by_link(*lowest.track);
+			if(track_nodes.count(Key(links[i], link_ep)))
+				continue;
+
+			unsigned mask = eps[i].paths&eps[lowest.ep].paths;
+			if(!mask)
+				continue;
+
+			unsigned path=0;
+			for(; !(mask&1); ++path, mask>>=1) ;
+			nodes.push(Node(*links[i], links[i]->get_endpoint_by_link(*lowest.track), ref, type.get_path_length(path)));
+		}
+	}
+
+	list<Track *> result;
+	for(Node *node=final; node; node=node->prev)
+		result.push_front(node->track);
+
+	return result;
+}
+
+template<typename Pred>
+Route *create_route(Track &from, unsigned ep, const Pred &goal)
+{
+	list<Track *> tracks = dijkstra(from, ep, goal);
+
+	if(tracks.empty())
+		return 0;
+
+	Route *route = new Route(from.get_layout());
+	for(list<Track *>::iterator i=tracks.begin(); i!=tracks.end(); ++i)
+		route->add_track(**i);
+
+	route->set_name("Pathfinder");
+	route->set_temporary(true);
+
+	return route;
+}
+
+}
+
+
 namespace Marklin {
 
-Route::Route(Layout &layout, const string &n):
-	name(n)
+Route::Route(Layout &l):
+	layout(l),
+	temporary(false)
 {
+	layout.add_route(*this);
 	layout.signal_track_removed.connect(sigc::mem_fun(this, &Route::track_removed));
 }
 
+Route::~Route()
+{
+	layout.remove_route(*this);
+}
+
+void Route::set_name(const string &n)
+{
+	name = n;
+	signal_name_changed.emit(name);
+}
+
+void Route::set_temporary(bool t)
+{
+	temporary = t;
+}
+
+void Route::set_turnout(unsigned addr, unsigned path)
+{
+	if(!addr)
+		throw InvalidParameterValue("Invalid turnout address");
+	map<unsigned, int>::iterator i = turnouts.find(addr);
+	if(i==turnouts.end())
+		throw KeyError("Turnout is not in this route");
+	if(i->second>=0 && path!=static_cast<unsigned>(i->second))
+		throw InvalidState("Setting conflicts with route");
+	i->second = path;
+}
+
+void Route::update_turnouts()
+{
+	set<unsigned> found;
+	for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
+		if(unsigned tid = (*i)->get_turnout_id())
+		{
+			found.insert(tid);
+
+			const vector<TrackType::Endpoint> &endpoints = (*i)->get_type().get_endpoints();
+			const vector<Track *> &links = (*i)->get_links();
+
+			// Build a combined path mask from linked endpoints
+			unsigned mask = 15;
+			for(unsigned j=0; j<endpoints.size(); ++j)
+			{
+				if(!tracks.count(links[j]))
+					continue;
+
+				if(unsigned tid2 = links[j]->get_turnout_id())
+				{
+					const TrackType::Endpoint &ep = links[j]->get_type().get_endpoints()[links[j]->get_endpoint_by_link(**i)];
+					int p = get_turnout(tid2);
+					if(p>=0 && !(ep.paths&(1<<p)))
+					{
+						// The linked track is a turnout and has a path which is incompatible with this endpoint
+						mask &= ~endpoints[j].paths;
+						continue;
+					}
+				}
+				mask &= endpoints[j].paths;
+			}
+
+			if(mask && !(mask&(mask-1)))
+			{
+				// Exactly one possible choice, set the path accordingly
+				unsigned path = 0;
+				for(; (mask && !(mask&1)); mask>>=1, ++path) ;
+				turnouts[tid] = path;
+			}
+			else if(!turnouts.count(tid))
+				// More than one possible choice, and no existing entry - set as undecided
+				turnouts[tid] = -1;
+		}
+
+	// Remove any turnouts that do not exist in the route
+	for(map<unsigned, int>::iterator i=turnouts.begin(); i!=turnouts.end();)
+	{
+		if(!found.count(i->first))
+			turnouts.erase(i++);
+		else
+			++i;
+	}
+}
+
 int Route::get_turnout(unsigned id) const
 {
 	map<unsigned, int>::const_iterator i = turnouts.find(id);
@@ -29,7 +238,7 @@ int Route::get_turnout(unsigned id) const
 	return -1;
 }
 
-void Route::add_track(const Track &trk)
+void Route::add_track(Track &trk)
 {
 	if(tracks.count(&trk))
 		return;
@@ -49,17 +258,17 @@ void Route::add_track(const Track &trk)
 	update_turnouts();
 }
 
-void Route::add_tracks(const set<const Track *> &trks)
+void Route::add_tracks(const set<Track *> &trks)
 {
-	set<const Track *> pending;
-	for(set<const Track *>::const_iterator i=trks.begin(); i!=trks.end(); ++i)
+	set<Track *> pending;
+	for(set<Track *>::const_iterator i=trks.begin(); i!=trks.end(); ++i)
 		if(!tracks.count(*i))
 			pending.insert(*i);
 
 	while(!pending.empty())
 	{
 		bool found = false;
-		for(set<const Track *>::const_iterator i=pending.begin(); i!=pending.end(); ++i)
+		for(set<Track *>::const_iterator i=pending.begin(); i!=pending.end(); ++i)
 			if(tracks.empty() || check_validity(**i)==7)
 			{
 				tracks.insert(*i);
@@ -75,80 +284,68 @@ void Route::add_tracks(const set<const Track *> &trks)
 	update_turnouts();
 }
 
-void Route::save(list<DataFile::Statement> &st) const
+void Route::add_track_chain(Track &start, unsigned ep, const TurnoutMap &trnts)
 {
-	for(map<unsigned, int>::const_iterator i=turnouts.begin(); i!=turnouts.end(); ++i)
-		st.push_back((DataFile::Statement("turnout"), i->first, i->second));
-}
-
-void Route::update_turnouts()
-{
-	set<unsigned> found;
-	for(set<const Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
-		if(unsigned tid=(*i)->get_turnout_id())
-		{
-			found.insert(tid);
+	TrackIter iter(&start, ep);
+	while(iter)
+	{
+		if(iter->get_type().is_dead_end())
+			break;
 
-			const vector<Endpoint> &endpoints = (*i)->get_type().get_endpoints();
-			const vector<Track *> &links = (*i)->get_links();
+		if(has_track(*iter))
+			break;
 
-			unsigned mask = 15;
-			for(unsigned j=0; j<endpoints.size(); ++j)
-			{
-				if(!tracks.count(links[j]))
-					continue;
-				if(unsigned tid2=links[j]->get_turnout_id())
-				{
-					const Endpoint &ep = links[j]->get_type().get_endpoints()[links[j]->get_endpoint_by_link(**i)];
-					int p = get_turnout(tid2);
-					if(p>=0 && !(ep.paths&(1<<p)))
-					{
-						mask &= ~endpoints[j].paths;
-						continue;
-					}
-				}
-				mask &= endpoints[j].paths;
-			}
+		int path = 0;
+		if(iter->get_turnout_id())
+		{
+			TurnoutMap::const_iterator i = trnts.find(iter->get_turnout_id());
+			if(i==trnts.end())
+				break;
 
-			if(!(mask&(mask-1)))
-			{
-				unsigned path = 0;
-				for(; (mask && !(mask&1)); mask>>=1, ++path) ;
-				turnouts[tid] = path;
-			}
-			else
-				turnouts[tid] = -1;
+			path = i->second;
 		}
 
-	for(map<unsigned, int>::iterator i=turnouts.begin(); i!=turnouts.end();)
-	{
-		if(!found.count(i->first))
-			turnouts.erase(i++);
-		else
-			++i;
+		add_track(*iter);
+
+		iter = iter.next(path);
 	}
 }
 
-unsigned Route::check_validity(const Track &trk) const
+bool Route::has_track(Track &t) const
+{
+	return tracks.count(&t);
+}
+
+void Route::save(list<DataFile::Statement> &st) const
+{
+	st.push_back((DataFile::Statement("name"), name));
+	for(map<unsigned, int>::const_iterator i=turnouts.begin(); i!=turnouts.end(); ++i)
+		st.push_back((DataFile::Statement("turnout"), i->first, i->second));
+}
+
+unsigned Route::check_validity(Track &trk) const
 {
 	unsigned result = 4;
-	for(set<const Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
+	for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
 	{
 		int epi=(*i)->get_endpoint_by_link(trk);
 		if(epi>=0)
 		{
+			// Linked to an existing track - good
 			result |= 1;
-			const vector<Endpoint> &endpoints = (*i)->get_type().get_endpoints();
+			const vector<TrackType::Endpoint> &endpoints = (*i)->get_type().get_endpoints();
 			if(unsigned tid=(*i)->get_turnout_id())
 			{
 				int r = get_turnout(tid);
 				if(r>=0)
 				{
+					// Linking to a turnout with path set is only good if we're continuing that path
 					if(endpoints[epi].paths&(1<<r))
 						result |= 2;
 				}
 				else
 				{
+					// Linked to a turnout with no path set - find out other linked tracks 
 					unsigned count = 0;
 					const vector<Track *> &links = (*i)->get_links();
 					int epj = -1;
@@ -158,15 +355,19 @@ unsigned Route::check_validity(const Track &trk) const
 							++count;
 							epj = k;
 						}
+
+					// Only good if at most one other track is linked to the turnout
 					if(count<=1)
 					{
 						result |= 2;
 						if(epj>=0 && !(endpoints[epi].paths&endpoints[epj].paths))
+							// Impossible path through the turnout - not good
 							result &= 3;
 					}
 				}
 			}
 			else
+				// Linked to something linear - good
 				result |= 2;
 		}
 	}
@@ -179,16 +380,62 @@ void Route::track_removed(Track &t)
 	tracks.erase(&t);
 }
 
+Route *Route::find(Track &from, unsigned ep, Track &to)
+{
+	return create_route(from, ep, TrackMatch(to));
+}
+
+Route *Route::find(Track &from, unsigned ep, const Route &to)
+{
+	return create_route(from, ep, TrackInSet(to.get_tracks()));
+}
+
+Route *Route::find(Track &from, unsigned ep, const set<Track *> &to)
+{
+	return create_route(from, ep, TrackInSet(to));
+}
+
 
 Route::Loader::Loader(Route &r):
 	DataFile::BasicLoader<Route>(r)
 {
+	add("name",    &Route::name);
 	add("turnout", &Loader::turnout);
 }
 
+void Route::Loader::finish()
+{
+	const set<Track *> &ltracks = obj.layout.get_tracks();
+	for(set<Track *>::const_iterator i=ltracks.begin(); i!=ltracks.end(); ++i)
+	{
+		unsigned tid = (*i)->get_turnout_id();
+		if(!tid)
+			continue;
+
+		TurnoutMap::iterator j = turnouts.find(tid);
+		if(j==turnouts.end())
+			continue;
+
+		unsigned path_mask = 1<<j->second;
+		const vector<TrackType::Endpoint> &eps = (*i)->get_type().get_endpoints();
+		for(unsigned k=0; k<eps.size(); ++k)
+			if(eps[k].paths&path_mask)
+			{
+				Track *link = (*i)->get_link(k);
+				if(!obj.tracks.count(link))
+					obj.add_track_chain(*link, link->get_endpoint_by_link(**i), turnouts);
+				if(!obj.tracks.count(*i))
+					obj.add_track_chain(**i, k, turnouts);
+				break;
+			}
+
+		break;
+	}
+}
+
 void Route::Loader::turnout(unsigned id, unsigned path)
 {
-	obj.turnouts[id] = path;
+	turnouts[id] = path;
 }
 
 } // namespace Marklin