X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flibmarklin%2Ftrain.cpp;h=d5b2b226721c961fb88b96753434d665f1f0180d;hb=f06c2b89a2601981aae84d0f971c07816dc1bab4;hp=fed1438b02cf064610c21c793b4b156842fce36b;hpb=06c100aacb559fbbe7380e15981c4772092c269b;p=r2c2.git

diff --git a/source/libmarklin/train.cpp b/source/libmarklin/train.cpp
index fed1438..d5b2b22 100644
--- a/source/libmarklin/train.cpp
+++ b/source/libmarklin/train.cpp
@@ -1,139 +1,819 @@
-#include "control.h"
-#include "trafficmanager.h"
+/* $Id$
+
+This file is part of the MSP Märklin suite
+Copyright © 2006-2010  Mikkosoft Productions, Mikko Rasa
+Distributed under the GPL
+*/
+
+#include <cmath>
+#include <msp/strings/formatter.h>
+#include <msp/time/units.h>
+#include <msp/time/utils.h>
+#include "aicontrol.h"
+#include "catalogue.h"
+#include "driver.h"
+#include "layout.h"
+#include "locotype.h"
+#include "route.h"
+#include "simplephysics.h"
+#include "tracktype.h"
 #include "train.h"
+#include "vehicle.h"
 
-#include <iostream>
 using namespace std;
+using namespace Msp;
 
 namespace Marklin {
 
-Train::Train(TrafficManager &tm, Locomotive &l):
-	trfc_mgr(tm),
-	loco(l),
-	target_speed(0)
+Train::Train(Layout &l, const LocoType &t, unsigned a):
+	layout(l),
+	loco_type(t),
+	address(a),
+	pending_block(0),
+	control(new AIControl(*this, new SimplePhysics)),
+	active(false),
+	current_speed(0),
+	speed_changing(false),
+	reverse(false),
+	functions(0),
+	route(0),
+	next_route(0),
+	end_of_route(false),
+	status("Unplaced"),
+	travel_dist(0),
+	pure_speed(false),
+	real_speed(15)
 {
-	trfc_mgr.add_train(this);
-	trfc_mgr.get_control().signal_sensor_event.connect(sigc::mem_fun(this, &Train::sensor_event));
+	vehicles.push_back(new Vehicle(layout, loco_type));
+
+	layout.add_train(*this);
+
+	layout.get_driver().add_loco(address);
+	layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
+	layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
+
+	layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
+	layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
+	layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
+}
+
+Train::~Train()
+{
+	for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
+		delete *i;
+	layout.remove_train(*this);
 }
 
 void Train::set_name(const string &n)
 {
-	name=n;
+	name = n;
 
 	signal_name_changed.emit(name);
 }
 
-void Train::set_speed(unsigned speed)
+Vehicle &Train::get_vehicle(unsigned i)
+{
+	if(i>=vehicles.size())
+		throw InvalidParameterValue("Vehicle index out of range");
+	return *vehicles[i];
+}
+
+const Vehicle &Train::get_vehicle(unsigned i) const
+{
+	if(i>=vehicles.size())
+		throw InvalidParameterValue("Vehicle index out of range");
+	return *vehicles[i];
+}
+
+void Train::set_control(const string &n, float v)
 {
-	target_speed=speed;
-	if(rsv_blocks.empty() && !reserve_more())
+	control->set_control(n, v);
+	signal_control_changed.emit(n, control->get_control(n).value);
+}
+
+void Train::set_active(bool a)
+{
+	if(a==active)
 		return;
-	loco.set_speed(speed);
+	if(!a && control->get_speed())
+		throw InvalidState("Can't deactivate while moving");
+
+	active = a;
+	if(active)
+	{
+		stop_timeout = Time::TimeStamp();
+		reserve_more();
+	}
+	else
+	{
+		stop_timeout = Time::now()+2*Time::sec;
+		set_status("Stopped");
+	}
 }
 
-void Train::place(Block *block, const Block::Endpoint *entry)
+void Train::set_function(unsigned func, bool state)
 {
-	for(BlockRefSeq::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end();)
+	if(!loco_type.get_functions().count(func))
+		throw InvalidParameterValue("Invalid function");
+	if(func<5)
+		layout.get_driver().set_loco_function(address, func, state);
+	else
+		layout.get_driver().set_loco_function(address+1, func-4, state);
+}
+
+bool Train::get_function(unsigned func) const
+{
+	return (functions>>func)&1;
+}
+
+void Train::set_route(const Route *r)
+{
+	if(!rsv_blocks.empty())
 	{
-		i->block->reserve(0);
-		i=rsv_blocks.erase(i);
+		for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
+			if(i->block->get_sensor_id())
+			{
+				release_blocks(rsv_blocks, ++i, rsv_blocks.end());
+				break;
+			}
 	}
 
-	for(BlockRefSeq::iterator i=cur_blocks.begin(); i!=cur_blocks.end();)
+	route = r;
+	next_route = 0;
+	end_of_route = false;
+
+	if(route)
 	{
-		i->block->reserve(0);
-		i=cur_blocks.erase(i);
+		BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
+		BlockRef next = last.next();
+		const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
+		if(!route->get_tracks().count(ep.track))
+		{
+			next_route = route;
+			route = Route::find(*ep.track, ep.track_ep, *next_route);
+		}
 	}
 
-	if(!block->reserve(this))
+	if(active)
+		reserve_more();
+
+	signal_route_changed.emit(route);
+}
+
+void Train::go_to(const Track &to)
+{
+	for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
+		if(i->block->get_tracks().count(const_cast<Track *>(&to)))
+		{
+			signal_arrived.emit();
+			set_route(0);
+			return;
+		}
+
+	BlockRef *last = 0;
+	if(rsv_blocks.empty())
+		last = &cur_blocks.back();
+	else
+	{
+		for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
+			if(i->block->get_sensor_id())
+				last = &*i;
+	}
+
+	BlockRef next = last->next();
+	const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
+
+	set_route(Route::find(*ep.track, ep.track_ep, to));
+}
+
+void Train::place(Block &block, unsigned entry)
+{
+	if(control->get_speed())
+		throw InvalidState("Must be stopped before placing");
+
+	release_blocks(rsv_blocks);
+	release_blocks(cur_blocks);
+
+	set_active(false);
+
+	if(!block.reserve(this))
+	{
+		set_status("Unplaced");
 		return;
+	}
 
-	cur_blocks.push_back(BlockRef(block, entry));
+	cur_blocks.push_back(BlockRef(&block, entry));
+	if(reverse)
+	{
+		unsigned exit = block.traverse(entry);
+		const Block::Endpoint &bep = block.get_endpoints()[exit];
+		Track *track = bep.track->get_link(bep.track_ep);
+		unsigned ep = track->get_endpoint_by_link(*bep.track);
+		vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
+	}
+	else
+	{
+		const Block::Endpoint &bep = block.get_endpoints()[entry];
+		vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
+	}
 }
 
-bool Train::free_block(Block *block)
+bool Train::free_block(Block &block)
 {
-	for(BlockRefSeq::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
-		if(i->block==block)
+	unsigned nsens = 0;
+	for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
+	{
+		if(i->block==&block)
 		{
-			while(i!=rsv_blocks.end())
-			{
-				i->block->reserve(0);
-				i=rsv_blocks.erase(i);
-			}
+			if(nsens<1)
+				return false;
+			release_blocks(rsv_blocks, i, rsv_blocks.end());
 			return true;
 		}
+		else if(i->block->get_sensor_id())
+			++nsens;
+	}
 
 	return false;
 }
 
-void Train::sensor_event(unsigned addr, bool state)
+int Train::get_entry_to_block(Block &block) const
 {
-	if(!loco.get_speed())
-		return;
+	for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
+		if(i->block==&block)
+			return i->entry;
+	for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
+		if(i->block==&block)
+			return i->entry;
+	return -1;
+}
+
+float Train::get_reserved_distance() const
+{
+	Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
+	const VehicleType &vtype = veh.get_type();
+
+	Track *track = veh.get_track();
+	unsigned entry = veh.get_entry();
+
+	float result = -vtype.get_length()/2;
+	if(reverse)
+	{
+		entry = track->traverse(entry);
+		result += veh.get_offset();
+	}
+	else
+		result -= veh.get_offset();
+
+	bool first = true;
+	list<BlockRef>::const_iterator block = cur_blocks.begin();
+	while(1)
+	{
+		if(!first || !reverse)
+			result += track->get_type().get_path_length(track->get_active_path());
+		first = false;
+
+		unsigned exit = track->traverse(entry);
+		Track *next = track->get_link(exit);
+
+		while(!block->block->get_tracks().count(next))
+		{
+			++block;
+			if(block==cur_blocks.end())
+				block = rsv_blocks.begin();
+			if(block==rsv_blocks.end())
+				return result;
+		}
+
+		entry = next->get_endpoint_by_link(*track);
+		track = next;
+	}
+}
+
+void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
+{
+	if(!active && stop_timeout && t>=stop_timeout)
+	{
+		release_blocks(rsv_blocks);
+		end_of_route = false;
+		stop_timeout = Time::TimeStamp();
+	}
+
+	control->tick(dt);
+	float speed = control->get_speed();
+	unsigned speed_notch = find_speed(abs(speed));
+
+	if(speed && (speed<0)!=reverse)
+	{
+		layout.get_driver().set_loco_reverse(address, speed<0);
+		reverse = speed<0;
+
+		release_blocks(rsv_blocks);
+		reverse_blocks(cur_blocks);
+
+		reserve_more();
+	}
+	if(speed_notch!=current_speed && !speed_changing)
+	{
+		speed_changing = true;
+		layout.get_driver().set_loco_speed(address, speed_notch);
+
+		pure_speed = false;
+
+		if(speed_notch)
+			set_status(format("Traveling %d kmh", get_travel_speed()));
+		else
+			set_status("Waiting");
+	}
 
+	if(speed)
+	{
+		if(!active)
+			set_active(true);
+
+		Track *track = vehicles[0]->get_track();
+
+		bool ok = false;
+		for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
+			ok = i->block->get_tracks().count(track);
+
+		if(ok)
+		{
+			float d = get_real_speed(current_speed)*(dt/Time::sec);
+			vehicles[0]->advance(reverse ? -d : d);
+		}
+	}
+	else if(end_of_route)
+		set_route(0);
+}
+
+void Train::save(list<DataFile::Statement> &st) const
+{
+	st.push_back((DataFile::Statement("name"), name));
+	for(unsigned i=0; i<=14; ++i)
+		if(real_speed[i].weight)
+			st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
+
+	if(!cur_blocks.empty())
+	{
+		list<BlockRef> blocks = cur_blocks;
+		if(reverse)
+			reverse_blocks(blocks);
+
+		Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
+		st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
+
+		for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
+			st.push_back((DataFile::Statement("block"), i->block->get_id()));
+	}
+
+	if(route)
+		st.push_back((DataFile::Statement("route"), route->get_name()));
+}
+
+void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
+{
+	if(addr==address)
+	{
+		current_speed = speed;
+		speed_changing = false;
+	}
+}
+
+void Train::loco_func_event(unsigned addr, unsigned func, bool state)
+{
+	if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
+	{
+		if(addr==address+1)
+			func += 4;
+		if(state)
+			functions |= 1<<func;
+		else
+			functions &= ~(1<<func);
+
+		signal_function_changed.emit(func, state);
+	}
+}
+
+void Train::sensor_event(unsigned addr, bool state)
+{
 	if(state)
 	{
-		BlockRefSeq::iterator i;
+		// Find the first sensor block from our reserved blocks that isn't this sensor
+		list<BlockRef>::iterator i;
 		for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 			if(i->block->get_sensor_id() && i->block->get_sensor_id()!=addr)
 				break;
-		cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 
-		cout<<"Train advanced, "<<cur_blocks.size()<<" cur_blocks, "<<rsv_blocks.size()<<" rsv_blocks\n";
+		if(i!=rsv_blocks.begin())
+		{
+			// Compute speed and update related state
+			float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 
-		reserve_more();
-		if(rsv_blocks.empty())
-			loco.set_speed(0);
+			if(pure_speed)
+			{
+				RealSpeed &rs = real_speed[current_speed];
+				rs.add(travel_dist/travel_time_secs, travel_time_secs);
+				set_status(format("Traveling %d kmh", get_travel_speed()));
+			}
+
+			travel_dist = 0;
+			float block_len;
+			for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
+			{
+				j->block->traverse(j->entry, &block_len);
+				travel_dist += block_len;
+
+				if(j->block->get_sensor_id()==addr)
+				{
+					const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
+					if(reverse)
+					{
+						Track *track = bep.track->get_link(bep.track_ep);
+						unsigned ep = track->get_endpoint_by_link(*bep.track);
+						vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
+					}
+					else
+						vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
+				}
+			}
+			last_entry_time = Time::now();
+			pure_speed = true;
+
+			// Check if we've reached the next route
+			if(next_route)
+			{
+				const set<const Track *> &rtracks = next_route->get_tracks();
+				for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
+					if(rtracks.count(j->block->get_endpoints()[j->entry].track))
+					{
+						route = next_route;
+						next_route = 0;
+						// XXX Exceptions?
+						signal_route_changed.emit(route);
+						break;
+					}
+			}
+
+			// Move blocks up to the next sensor to our current blocks
+			cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
+
+			// Try to get more blocks if we're moving
+			if(active)
+			{
+				unsigned nsens = reserve_more();
+				if(!nsens && end_of_route)
+					signal_arrived.emit();
+			}
+		}
 	}
 	else
 	{
-		cout<<"Finding blocks to free\n";
-		BlockRefSeq::iterator i;
-		for(i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
-			if(i->block->get_sensor_id()==addr)
-				break;
-		if(i!=cur_blocks.end())
+		// Find the first sensor in our current blocks that's still active
+		list<BlockRef>::iterator end = cur_blocks.begin();
+		for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
+			if(i->block->get_sensor_id())
+			{
+				if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
+					break;
+				else
+					end = i;
+			}
+		
+		if(end!=cur_blocks.begin())
 		{
-			cout<<"found\n";
-			++i;
-			for(BlockRefSeq::iterator j=cur_blocks.begin(); j!=i; ++j)
-				j->block->reserve(0);
-			cur_blocks.erase(cur_blocks.begin(), i);
-			cout<<cur_blocks.size()<<" cur_blocks\n";
+			// Free blocks up to the last inactive sensor
+			++end;
+			release_blocks(cur_blocks, cur_blocks.begin(), end);
 		}
+	}
+}
 
-		reserve_more();
+void Train::turnout_event(unsigned addr, bool)
+{
+	if(pending_block)
+	{
+		unsigned pending_addr = pending_block->get_turnout_id();
+		bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
+		if(addr==pending_addr || (double_addr && addr==pending_addr+1))
+			reserve_more();
 	}
 }
 
-bool Train::reserve_more()
+void Train::block_reserved(const Block &block, const Train *train)
+{
+	if(&block==pending_block && !train)
+		reserve_more();
+}
+
+unsigned Train::reserve_more()
 {
-	BlockRef *last=0;
+	BlockRef *last = 0;
 	if(!rsv_blocks.empty())
-		last=&rsv_blocks.back();
+		last = &rsv_blocks.back();
 	else if(!cur_blocks.empty())
-		last=&cur_blocks.back();
+		last = &cur_blocks.back();
 	if(!last)
-		return false;
+		return 0;
 
-	bool result=false;
-	unsigned size=rsv_blocks.size();
-	while(size<5)
+	pending_block = 0;
+
+	// See how many sensor blocks we already have
+	unsigned nsens = 0;
+	for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
+		if(i->block->get_sensor_id())
+			++nsens;
+	
+	if(end_of_route)
+		return nsens;
+
+	const Route *cur_route = 0;
+	if(route)
 	{
-		const Block::Endpoint *exit=last->block->traverse(last->entry);
-		if(exit && exit->link->reserve(this))
+		const set<Track *> &tracks = last->block->get_tracks();
+		for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 		{
-			rsv_blocks.push_back(BlockRef(exit->link, exit->link->get_endpoint_by_link(last->block)));
-			last=&rsv_blocks.back();
-			++size;
-			result=true;
+			if(route->get_tracks().count(*i))
+				cur_route = route;
+			else if(next_route && next_route->get_tracks().count(*i))
+				cur_route = next_route;
 		}
-		else
+	}
+
+	bool got_more = false;
+	BlockRef *good = last;
+	unsigned good_sens = nsens;
+	while(good_sens<3)
+	{
+		// Traverse to the next block
+		unsigned exit = last->block->traverse(last->entry);
+		Block *link = last->block->get_link(exit);
+		if(!link)
+			break;
+
+		int entry = link->get_endpoint_by_link(*last->block);
+		if(entry<0)
+			throw LogicError("Block links are inconsistent!");
+
+		const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
+
+		if(cur_route)
+		{
+			if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
+				cur_route = next_route;
+			else if(!cur_route->get_tracks().count(entry_ep.track))
+			{
+				// Keep the blocks if we arrived at the end of the route
+				good = last;
+				good_sens = nsens;
+				end_of_route = true;
+				break;
+			}
+		}
+		else if(route && route->get_tracks().count(entry_ep.track))
+			cur_route = route;
+
+		if(!link->reserve(this))
+		{
+			// If we found another train and it's not headed straight for us, we can keep the blocks we got
+			int other_entry = link->get_train()->get_entry_to_block(*link);
+			if(other_entry<0)
+				throw LogicError("Block reservation inconsistency");
+			if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
+			{
+				good = last;
+				good_sens = nsens;
+			}
+			pending_block = link;
+			break;
+		}
+
+		if(link->get_turnout_id())
+		{
+			const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
+
+			// Keep the blocks reserved so far, as either us or the other train can diverge
+			good = last;
+			good_sens = nsens;
+
+			// Figure out what path we'd like to take on the turnout
+			int path = -1;
+			if(cur_route)
+				path = cur_route->get_turnout(link->get_turnout_id());
+			if(path<0)
+				path = entry_ep.track->get_active_path();
+			if(!((track_ep.paths>>path)&1))
+			{
+				for(unsigned i=0; track_ep.paths>>i; ++i)
+					if((track_ep.paths>>i)&1)
+						path = i;
+			}
+
+			if(path!=static_cast<int>(entry_ep.track->get_active_path()))
+			{
+				// The turnout is set to wrong path - switch and wait for it
+				link->reserve(0);
+				pending_block = link;
+				entry_ep.track->set_active_path(path);
+				break;
+			}
+		}
+
+		rsv_blocks.push_back(BlockRef(link, entry));
+		last = &rsv_blocks.back();
+		if(last->block->get_sensor_id())
+		{
+			++nsens;
+			got_more = true;
+		}
+	}
+
+	// Unreserve blocks that were not good
+	while(!rsv_blocks.empty() && last!=good)
+	{
+		last->block->reserve(0);
+		rsv_blocks.erase(--rsv_blocks.end());
+		if(!rsv_blocks.empty())
+			last = &rsv_blocks.back();
+	}
+
+	return good_sens;
+}
+
+float Train::get_real_speed(unsigned i) const
+{
+	if(real_speed[i].weight)
+		return real_speed[i].speed;
+
+	unsigned low;
+	unsigned high;
+	for(low=i; low>0; --low)
+		if(real_speed[low].weight)
+			break;
+	for(high=i; high<14; ++high)
+		if(real_speed[high].weight)
 			break;
+
+	if(real_speed[high].weight)
+	{
+		if(real_speed[low].weight)
+		{
+			float f = float(i-low)/(high-low);
+			return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
+		}
+		else
+			return real_speed[high].speed*float(i)/high;
+	}
+	else if(real_speed[low].weight)
+		return real_speed[low].speed*float(i)/low;
+	else
+		return 0;
+}
+
+unsigned Train::find_speed(float real) const
+{
+	if(real<=real_speed[0].speed)
+		return 0;
+
+	unsigned low = 0;
+	unsigned high = 0;
+	for(unsigned i=0; (!high && i<=14); ++i)
+		if(real_speed[i].weight)
+		{
+			if(real_speed[i].speed<real)
+				low = i;
+			else
+				high = i;
+		}
+	if(!high)
+	{
+		if(!low)
+			return 0;
+		return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 	}
 
-	return result;
+	float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
+	return static_cast<unsigned>(low*(1-f)+high*f+0.5);
+}
+
+float Train::get_travel_speed() const
+{
+	float speed = get_real_speed(current_speed);
+	float scale = layout.get_catalogue().get_scale();
+	return static_cast<int>(round(speed/scale*3.6/5))*5;
+}
+
+void Train::set_status(const string &s)
+{
+	status = s;
+	signal_status_changed.emit(s);
+}
+
+void Train::release_blocks(list<BlockRef> &blocks)
+{
+	release_blocks(blocks, blocks.begin(), blocks.end());
+}
+
+void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
+{
+	while(begin!=end)
+	{
+		Block *block = begin->block;
+		blocks.erase(begin++);
+		block->reserve(0);
+	}
+}
+
+void Train::reverse_blocks(list<BlockRef> &blocks) const
+{
+	blocks.reverse();
+	for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
+		i->entry = i->block->traverse(i->entry);
+}
+
+
+Train::BlockRef::BlockRef(Block *b, unsigned e):
+	block(b),
+	entry(e)
+{ }
+
+Train::BlockRef Train::BlockRef::next() const
+{
+	Block *blk = block->get_endpoints()[block->traverse(entry)].link;
+	if(!blk)
+		throw InvalidState("At end of line");
+
+	int ep = blk->get_endpoint_by_link(*block);
+	if(ep<0)
+		throw LogicError("Block links are inconsistent");
+
+	return BlockRef(blk, ep);
+}
+
+
+Train::RealSpeed::RealSpeed():
+	speed(0),
+	weight(0)
+{ }
+
+void Train::RealSpeed::add(float s, float w)
+{
+	speed = (speed*weight+s*w)/(weight+w);
+	weight = min(weight+w, 300.0f);
+}
+
+
+Train::Loader::Loader(Train &t):
+	DataFile::BasicLoader<Train>(t),
+	prev_block(0)
+{
+	add("block",       &Loader::block);
+	add("block_hint",  &Loader::block_hint);
+	add("name",        &Loader::name);
+	add("real_speed",  &Loader::real_speed);
+	add("route",       &Loader::route);
+}
+
+void Train::Loader::block(unsigned id)
+{
+	Block &blk = obj.layout.get_block(id);
+	int entry = -1;
+	if(prev_block)
+		entry = blk.get_endpoint_by_link(*prev_block);
+	if(entry<0)
+		entry = 0;
+
+	blk.reserve(&obj);
+	obj.cur_blocks.push_back(BlockRef(&blk, entry));
+	obj.set_status("Stopped");
+	const Block::Endpoint &bep = blk.get_endpoints()[entry];
+	obj.vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
+
+	if(blk.get_sensor_id())
+		obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
+
+	prev_block = &blk;
+}
+
+void Train::Loader::block_hint(unsigned id)
+{
+	prev_block = &obj.layout.get_block(id);
+}
+
+void Train::Loader::name(const string &n)
+{
+	obj.set_name(n);
+}
+
+void Train::Loader::real_speed(unsigned i, float speed, float weight)
+{
+	obj.real_speed[i].speed = speed;
+	obj.real_speed[i].weight = weight;
+}
+
+void Train::Loader::route(const string &n)
+{
+	obj.set_route(&obj.layout.get_route(n));
 }
 
 } // namespace Marklin