source/libmarklin/train.cpp

   1 /* $Id$
   2
   3 This file is part of the MSP Märklin suite
   4 Copyright © 2006-2010  Mikkosoft Productions, Mikko Rasa
   5 Distributed under the GPL
   6 */
   7
   8 #include <cmath>
   9 #include <msp/strings/formatter.h>
  10 #include <msp/time/units.h>
  11 #include <msp/time/utils.h>
  12 #include "aicontrol.h"
  13 #include "catalogue.h"
  14 #include "driver.h"
  15 #include "layout.h"
  16 #include "locotype.h"
  17 #include "route.h"
  18 #include "simplephysics.h"
  19 #include "timetable.h"
  20 #include "tracktype.h"
  21 #include "train.h"
  22 #include "vehicle.h"
  23
  24 using namespace std;
  25 using namespace Msp;
  26
  27 namespace Marklin {
  28
  29 Train::Train(Layout &l, const LocoType &t, unsigned a):
  30         layout(l),
  31         loco_type(t),
  32         address(a),
  33         priority(0),
  34         pending_block(0),
  35         control(new AIControl(*this, new SimplePhysics)),
  36         timetable(0),
  37         active(false),
  38         current_speed(0),
  39         speed_changing(false),
  40         reverse(false),
  41         functions(0),
  42         route(0),
  43         next_route(0),
  44         end_of_route(false),
  45         status("Unplaced"),
  46         travel_dist(0),
  47         pure_speed(false),
  48         real_speed(15),
  49         accurate_position(false),
  50         overshoot_dist(false)
  51 {
  52         vehicles.push_back(new Vehicle(layout, loco_type));
  53
  54         layout.add_train(*this);
  55
  56         layout.get_driver().add_loco(address);
  57         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  58         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  59
  60         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  61         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  62         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  63
  64         layout.get_driver().signal_halt.connect(sigc::mem_fun(this, &Train::halt_event));
  65
  66         control->signal_control_changed.connect(signal_control_changed);
  67 }
  68
  69 Train::~Train()
  70 {
  71         delete control;
  72         delete timetable;
  73         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  74                 delete *i;
  75         layout.remove_train(*this);
  76 }
  77
  78 void Train::set_name(const string &n)
  79 {
  80         name = n;
  81
  82         signal_name_changed.emit(name);
  83 }
  84
  85 void Train::set_priority(int p)
  86 {
  87         priority = p;
  88 }
  89
  90 Vehicle &Train::get_vehicle(unsigned i)
  91 {
  92         if(i>=vehicles.size())
  93                 throw InvalidParameterValue("Vehicle index out of range");
  94         return *vehicles[i];
  95 }
  96
  97 const Vehicle &Train::get_vehicle(unsigned i) const
  98 {
  99         if(i>=vehicles.size())
 100                 throw InvalidParameterValue("Vehicle index out of range");
 101         return *vehicles[i];
 102 }
 103
 104 void Train::set_control(const string &n, float v)
 105 {
 106         control->set_control(n, v);
 107 }
 108
 109 void Train::set_active(bool a)
 110 {
 111         if(a==active)
 112                 return;
 113         if(!a && control->get_speed())
 114                 throw InvalidState("Can't deactivate while moving");
 115
 116         active = a;
 117         if(active)
 118         {
 119                 stop_timeout = Time::TimeStamp();
 120                 reserve_more();
 121         }
 122         else
 123         {
 124                 stop_timeout = Time::now()+2*Time::sec;
 125                 set_status("Stopped");
 126         }
 127 }
 128
 129 void Train::set_function(unsigned func, bool state)
 130 {
 131         if(!loco_type.get_functions().count(func))
 132                 throw InvalidParameterValue("Invalid function");
 133         if(func<5)
 134                 layout.get_driver().set_loco_function(address, func, state);
 135         else
 136                 layout.get_driver().set_loco_function(address+1, func-4, state);
 137 }
 138
 139 bool Train::get_function(unsigned func) const
 140 {
 141         return (functions>>func)&1;
 142 }
 143
 144 void Train::set_route(const Route *r)
 145 {
 146         if(!rsv_blocks.empty())
 147         {
 148                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 149                         if(i->block->get_sensor_id())
 150                         {
 151                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 152                                 break;
 153                         }
 154         }
 155
 156         route = r;
 157         next_route = 0;
 158         end_of_route = false;
 159
 160         if(route)
 161         {
 162                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 163                 BlockRef next = last.next();
 164                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 165                 if(!route->get_tracks().count(ep.track))
 166                 {
 167                         next_route = route;
 168                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 169                 }
 170         }
 171
 172         reserve_more();
 173
 174         signal_route_changed.emit(route);
 175 }
 176
 177 void Train::go_to(const Track &to)
 178 {
 179         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 180                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 181                 {
 182                         signal_arrived.emit();
 183                         set_route(0);
 184                         return;
 185                 }
 186
 187         BlockRef *last = 0;
 188         if(rsv_blocks.empty())
 189                 last = &cur_blocks.back();
 190         else
 191         {
 192                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 193                         if(i->block->get_sensor_id())
 194                                 last = &*i;
 195         }
 196
 197         BlockRef next = last->next();
 198         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 199
 200         set_route(Route::find(*ep.track, ep.track_ep, to));
 201 }
 202
 203 void Train::place(Block &block, unsigned entry)
 204 {
 205         if(control->get_speed())
 206                 throw InvalidState("Must be stopped before placing");
 207
 208         release_blocks(rsv_blocks);
 209         release_blocks(cur_blocks);
 210
 211         set_active(false);
 212         accurate_position = false;
 213
 214         if(!block.reserve(this))
 215         {
 216                 set_status("Unplaced");
 217                 return;
 218         }
 219
 220         cur_blocks.push_back(BlockRef(&block, entry));
 221         if(reverse)
 222         {
 223                 unsigned exit = block.traverse(entry);
 224                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 225                 Track *track = bep.track->get_link(bep.track_ep);
 226                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 227                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 228         }
 229         else
 230         {
 231                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 232                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 233         }
 234 }
 235
 236 bool Train::free_block(Block &block)
 237 {
 238         unsigned nsens = 0;
 239         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 240         {
 241                 if(i->block==&block)
 242                 {
 243                         if(nsens<1)
 244                                 return false;
 245                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 246                         return true;
 247                 }
 248                 else if(i->block->get_sensor_id())
 249                         ++nsens;
 250         }
 251
 252         return false;
 253 }
 254
 255 int Train::get_entry_to_block(Block &block) const
 256 {
 257         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 258                 if(i->block==&block)
 259                         return i->entry;
 260         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 261                 if(i->block==&block)
 262                         return i->entry;
 263         return -1;
 264 }
 265
 266 float Train::get_reserved_distance() const
 267 {
 268         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 269         const VehicleType &vtype = veh.get_type();
 270
 271         Track *track = veh.get_track();
 272         if(!track)
 273                 return 0;
 274         unsigned entry = veh.get_entry();
 275
 276         float result = -vtype.get_length()/2;
 277         if(reverse)
 278         {
 279                 entry = track->traverse(entry);
 280                 result += veh.get_offset();
 281         }
 282         else
 283                 result -= veh.get_offset();
 284
 285         bool first = true;
 286         list<BlockRef>::const_iterator block = cur_blocks.begin();
 287         while(1)
 288         {
 289                 if(!first || !reverse)
 290                         result += track->get_type().get_path_length(track->get_active_path());
 291                 first = false;
 292
 293                 if(track->get_type().get_endpoints().size()<2)
 294                         return result;
 295
 296                 unsigned exit = track->traverse(entry);
 297                 Track *next = track->get_link(exit);
 298
 299                 while(!block->block->get_tracks().count(next))
 300                 {
 301                         ++block;
 302                         if(block==cur_blocks.end())
 303                                 block = rsv_blocks.begin();
 304                         if(block==rsv_blocks.end())
 305                                 return result;
 306                 }
 307
 308                 entry = next->get_endpoint_by_link(*track);
 309                 track = next;
 310         }
 311 }
 312
 313 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 314 {
 315         if(!active && stop_timeout && t>=stop_timeout)
 316         {
 317                 release_blocks(rsv_blocks);
 318                 end_of_route = false;
 319                 stop_timeout = Time::TimeStamp();
 320         }
 321
 322         Driver &driver = layout.get_driver();
 323
 324         if(timetable)
 325                 timetable->tick(t);
 326         control->tick(dt);
 327         float speed = control->get_speed();
 328         unsigned speed_notch = find_speed(abs(speed));
 329
 330         if(control->get_reverse()!=reverse)
 331         {
 332                 reverse = control->get_reverse();
 333                 driver.set_loco_reverse(address, reverse);
 334
 335                 release_blocks(rsv_blocks);
 336                 reverse_blocks(cur_blocks);
 337
 338                 reserve_more();
 339         }
 340         if(speed_notch!=current_speed && !speed_changing && !driver.is_halted() && driver.get_power())
 341         {
 342                 speed_changing = true;
 343                 driver.set_loco_speed(address, speed_notch);
 344
 345                 pure_speed = false;
 346
 347                 if(speed_notch)
 348                         set_status(format("Traveling %d kmh", get_travel_speed()));
 349                 else
 350                         set_status("Waiting");
 351         }
 352
 353         if(speed)
 354         {
 355                 if(!active)
 356                         set_active(true);
 357
 358                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 359                 Track *track = vehicle.get_track();
 360
 361                 bool ok = false;
 362                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 363                         ok = i->block->get_tracks().count(track);
 364
 365                 float d = get_real_speed(current_speed)*(dt/Time::sec);
 366                 if(ok)
 367                         vehicle.advance(reverse ? -d : d);
 368                 else if(accurate_position)
 369                 {
 370                         overshoot_dist += d;
 371                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 372                         {
 373                                 layout.emergency(name+" has not arrived at sensor");
 374                                 accurate_position = false;
 375                         }
 376                 }
 377         }
 378         else if(end_of_route)
 379                 set_route(0);
 380
 381         if(!cur_blocks.empty() && !cur_blocks.front().block->get_sensor_id())
 382         {
 383                 Vehicle &veh = *(reverse ? vehicles.front() : vehicles.back());
 384
 385                 list<BlockRef>::iterator i = cur_blocks.begin();
 386                 const Block::Endpoint &bep = i->block->get_endpoints()[i->entry];
 387
 388                 Track *track = bep.track;
 389                 unsigned entry = bep.track_ep;
 390
 391                 bool found = false;
 392                 float dist = veh.get_offset()-veh.get_type().get_length()/2;
 393                 while(1)
 394                 {
 395                         if(track==veh.get_track())
 396                         {
 397                                 found = true;
 398                                 break;
 399                         }
 400
 401                         if(i!=cur_blocks.begin())
 402                         {
 403                                 float path_len = track->get_type().get_path_length(track->get_active_path());
 404                                 dist += path_len;
 405                         }
 406
 407                         unsigned exit = track->traverse(entry);
 408                         Track *next = track->get_link(exit);
 409                         entry = next->get_endpoint_by_link(*track);
 410                         track = next;
 411
 412                         if(!i->block->get_tracks().count(track))
 413                         {
 414                                 ++i;
 415                                 if(i==cur_blocks.end())
 416                                         break;
 417                         }
 418                 }
 419
 420                 if(found && i!=cur_blocks.begin() && dist>10*layout.get_catalogue().get_scale())
 421                 {
 422                         cur_blocks.front().block->reserve(0);
 423                         cur_blocks.erase(cur_blocks.begin());
 424                 }
 425         }
 426 }
 427
 428 void Train::save(list<DataFile::Statement> &st) const
 429 {
 430         st.push_back((DataFile::Statement("name"), name));
 431
 432         st.push_back((DataFile::Statement("priority"), priority));
 433
 434         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 435                 if(i!=vehicles.begin())
 436                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 437
 438         for(unsigned i=0; i<=14; ++i)
 439                 if(real_speed[i].weight)
 440                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 441
 442         if(!cur_blocks.empty())
 443         {
 444                 list<BlockRef> blocks = cur_blocks;
 445                 if(reverse)
 446                         reverse_blocks(blocks);
 447
 448                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 449                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 450
 451                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 452                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 453         }
 454
 455         if(route)
 456         {
 457                 if(!route->is_temporary())
 458                         st.push_back((DataFile::Statement("route"), route->get_name()));
 459                 else if(next_route && !next_route->is_temporary())
 460                         st.push_back((DataFile::Statement("route"), next_route->get_name()));
 461         }
 462
 463         if(timetable)
 464         {
 465                 DataFile::Statement ss("timetable");
 466                 timetable->save(ss.sub);
 467                 st.push_back(ss);
 468         }
 469 }
 470
 471 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 472 {
 473         if(addr==address)
 474         {
 475                 current_speed = speed;
 476                 speed_changing = false;
 477                 pure_speed = false;
 478         }
 479 }
 480
 481 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 482 {
 483         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 484         {
 485                 if(addr==address+1)
 486                         func += 4;
 487                 if(state)
 488                         functions |= 1<<func;
 489                 else
 490                         functions &= ~(1<<func);
 491
 492                 signal_function_changed.emit(func, state);
 493         }
 494 }
 495
 496 void Train::sensor_event(unsigned addr, bool state)
 497 {
 498         if(state)
 499         {
 500                 // Find the first sensor block from our reserved blocks that isn't this sensor
 501                 list<BlockRef>::iterator i;
 502                 unsigned result = 0;
 503                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 504                         if(i->block->get_sensor_id())
 505                         {
 506                                 if(i->block->get_sensor_id()!=addr)
 507                                 {
 508                                         if(result==0)
 509                                                 result = 2;
 510                                         else if(result==1)
 511                                                 break;
 512                                 }
 513                                 else if(result==0)
 514                                         result = 1;
 515                                 else if(result==2)
 516                                         result = 3;
 517                         }
 518
 519                 if(result==1 && i!=rsv_blocks.begin())
 520                 {
 521                         // Compute speed and update related state
 522                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 523
 524                         if(pure_speed)
 525                         {
 526                                 RealSpeed &rs = real_speed[current_speed];
 527                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 528                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 529                         }
 530
 531                         travel_dist = 0;
 532                         float block_len;
 533                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 534                         {
 535                                 j->block->traverse(j->entry, &block_len);
 536                                 travel_dist += block_len;
 537
 538                                 if(j->block->get_sensor_id()==addr)
 539                                 {
 540                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 541                                         if(reverse)
 542                                         {
 543                                                 Track *track = bep.track->get_link(bep.track_ep);
 544                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 545                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 546                                         }
 547                                         else
 548                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 549                                 }
 550                         }
 551                         last_entry_time = Time::now();
 552                         pure_speed = true;
 553                         accurate_position = true;
 554                         overshoot_dist = 0;
 555
 556                         // Check if we've reached the next route
 557                         if(next_route)
 558                         {
 559                                 const set<const Track *> &rtracks = next_route->get_tracks();
 560                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 561                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 562                                         {
 563                                                 route = next_route;
 564                                                 next_route = 0;
 565                                                 // XXX Exceptions?
 566                                                 signal_route_changed.emit(route);
 567                                                 break;
 568                                         }
 569                         }
 570
 571                         // Move blocks up to the next sensor to our current blocks
 572                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 573
 574                         // Try to get more blocks if we're moving
 575                         if(active)
 576                         {
 577                                 unsigned nsens = reserve_more();
 578                                 if(!nsens && end_of_route)
 579                                         signal_arrived.emit();
 580                         }
 581                 }
 582                 else if(result==3)
 583                         layout.emergency("Sensor for "+name+" triggered out of order");
 584         }
 585         else
 586         {
 587                 // Find the first sensor in our current blocks that's still active
 588                 list<BlockRef>::iterator end = cur_blocks.begin();
 589                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 590                         if(i->block->get_sensor_id())
 591                         {
 592                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 593                                         break;
 594                                 else
 595                                 {
 596                                         end = i;
 597                                         ++end;
 598                                 }
 599                         }
 600
 601                 if(end!=cur_blocks.begin())
 602                         // Free blocks up to the last inactive sensor
 603                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 604         }
 605 }
 606
 607 void Train::turnout_event(unsigned addr, bool)
 608 {
 609         if(pending_block)
 610         {
 611                 unsigned pending_addr = pending_block->get_turnout_id();
 612                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 613                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 614                         reserve_more();
 615         }
 616 }
 617
 618 void Train::halt_event(bool h)
 619 {
 620         if(h)
 621                 accurate_position = false;
 622 }
 623
 624 void Train::block_reserved(const Block &block, const Train *train)
 625 {
 626         if(&block==pending_block && !train)
 627                 reserve_more();
 628 }
 629
 630 unsigned Train::reserve_more()
 631 {
 632         if(!active)
 633                 return;
 634
 635         BlockRef *last = 0;
 636         if(!rsv_blocks.empty())
 637                 last = &rsv_blocks.back();
 638         else if(!cur_blocks.empty())
 639                 last = &cur_blocks.back();
 640         if(!last)
 641                 return 0;
 642
 643         pending_block = 0;
 644
 645         // See how many sensor blocks we already have
 646         unsigned nsens = 0;
 647         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 648                 if(i->block->get_sensor_id())
 649                         ++nsens;
 650
 651         if(end_of_route)
 652                 return nsens;
 653
 654         const Route *cur_route = 0;
 655         if(route)
 656         {
 657                 const set<Track *> &tracks = last->block->get_tracks();
 658                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 659                 {
 660                         if(route->get_tracks().count(*i))
 661                                 cur_route = route;
 662                         else if(next_route && next_route->get_tracks().count(*i))
 663                                 cur_route = next_route;
 664                 }
 665         }
 666
 667         bool got_more = false;
 668         BlockRef *good = last;
 669         unsigned good_sens = nsens;
 670         while(good_sens<3)
 671         {
 672                 if(last->block->get_endpoints().size()<2)
 673                 {
 674                         good = last;
 675                         good_sens = nsens;
 676                         break;
 677                 }
 678
 679                 // Traverse to the next block
 680                 unsigned exit = last->block->traverse(last->entry);
 681                 Block *link = last->block->get_link(exit);
 682                 if(!link)
 683                         break;
 684
 685                 int entry = link->get_endpoint_by_link(*last->block);
 686                 if(entry<0)
 687                         throw LogicError("Block links are inconsistent!");
 688
 689                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 690
 691                 if(cur_route)
 692                 {
 693                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 694                                 cur_route = next_route;
 695                         else if(!cur_route->get_tracks().count(entry_ep.track))
 696                         {
 697                                 // Keep the blocks if we arrived at the end of the route
 698                                 good = last;
 699                                 good_sens = nsens;
 700                                 end_of_route = true;
 701                                 break;
 702                         }
 703                 }
 704                 else if(route && route->get_tracks().count(entry_ep.track))
 705                         cur_route = route;
 706
 707                 bool reserved = link->reserve(this);
 708                 if(!reserved)
 709                 {
 710                         // Ask a lesser priority train to free the block for us
 711                         if(link->get_train()->get_priority()<priority)
 712                                 if(link->get_train()->free_block(*link))
 713                                         reserved = link->reserve(this);
 714
 715                         if(!reserved)
 716                         {
 717                                 // If we found another train and it's not headed straight for us, we can keep the blocks we got
 718                                 int other_entry = link->get_train()->get_entry_to_block(*link);
 719                                 if(other_entry<0)
 720                                         throw LogicError("Block reservation inconsistency");
 721                                 if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 722                                 {
 723                                         good = last;
 724                                         good_sens = nsens;
 725                                 }
 726                                 pending_block = link;
 727                                 break;
 728                         }
 729                 }
 730
 731                 if(link->get_turnout_id())
 732                 {
 733                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 734
 735                         // Keep the blocks reserved so far, as either us or the other train can diverge
 736                         good = last;
 737                         good_sens = nsens;
 738
 739                         // Figure out what path we'd like to take on the turnout
 740                         int path = -1;
 741                         if(cur_route)
 742                                 path = cur_route->get_turnout(link->get_turnout_id());
 743                         if(path<0)
 744                                 path = entry_ep.track->get_active_path();
 745                         if(!((track_ep.paths>>path)&1))
 746                         {
 747                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 748                                         if((track_ep.paths>>i)&1)
 749                                                 path = i;
 750                         }
 751
 752                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 753                         {
 754                                 // The turnout is set to wrong path - switch and wait for it
 755                                 link->reserve(0);
 756                                 pending_block = link;
 757                                 entry_ep.track->set_active_path(path);
 758                                 break;
 759                         }
 760                 }
 761
 762                 rsv_blocks.push_back(BlockRef(link, entry));
 763                 last = &rsv_blocks.back();
 764                 if(last->block->get_sensor_id())
 765                 {
 766                         ++nsens;
 767                         got_more = true;
 768                 }
 769         }
 770
 771         // Unreserve blocks that were not good
 772         while(!rsv_blocks.empty() && last!=good)
 773         {
 774                 last->block->reserve(0);
 775                 rsv_blocks.erase(--rsv_blocks.end());
 776                 if(!rsv_blocks.empty())
 777                         last = &rsv_blocks.back();
 778         }
 779
 780         // Make any sensorless blocks at the beginning immediately current
 781         list<BlockRef>::iterator i;
 782         for(i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !i->block->get_sensor_id()); ++i) ;
 783         if(i!=rsv_blocks.begin())
 784                 cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 785
 786         return good_sens;
 787 }
 788
 789 float Train::get_real_speed(unsigned i) const
 790 {
 791         if(real_speed[i].weight)
 792                 return real_speed[i].speed;
 793
 794         unsigned low;
 795         unsigned high;
 796         for(low=i; low>0; --low)
 797                 if(real_speed[low].weight)
 798                         break;
 799         for(high=i; high<14; ++high)
 800                 if(real_speed[high].weight)
 801                         break;
 802
 803         if(real_speed[high].weight)
 804         {
 805                 if(real_speed[low].weight)
 806                 {
 807                         float f = float(i-low)/(high-low);
 808                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 809                 }
 810                 else
 811                         return real_speed[high].speed*float(i)/high;
 812         }
 813         else if(real_speed[low].weight)
 814                 return real_speed[low].speed*float(i)/low;
 815         else
 816                 return 0;
 817 }
 818
 819 unsigned Train::find_speed(float real) const
 820 {
 821         if(real<=real_speed[0].speed)
 822                 return 0;
 823
 824         unsigned low = 0;
 825         unsigned high = 0;
 826         for(unsigned i=0; (!high && i<=14); ++i)
 827                 if(real_speed[i].weight)
 828                 {
 829                         if(real_speed[i].speed<real)
 830                                 low = i;
 831                         else
 832                                 high = i;
 833                 }
 834         if(!high)
 835         {
 836                 if(!low)
 837                         return 0;
 838                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 839         }
 840
 841         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 842         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 843 }
 844
 845 float Train::get_travel_speed() const
 846 {
 847         float speed = get_real_speed(current_speed);
 848         float scale = layout.get_catalogue().get_scale();
 849         return static_cast<int>(round(speed/scale*3.6/5))*5;
 850 }
 851
 852 void Train::set_status(const string &s)
 853 {
 854         status = s;
 855         signal_status_changed.emit(s);
 856 }
 857
 858 void Train::release_blocks(list<BlockRef> &blocks)
 859 {
 860         release_blocks(blocks, blocks.begin(), blocks.end());
 861 }
 862
 863 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 864 {
 865         while(begin!=end)
 866         {
 867                 Block *block = begin->block;
 868                 blocks.erase(begin++);
 869                 block->reserve(0);
 870         }
 871 }
 872
 873 void Train::reverse_blocks(list<BlockRef> &blocks) const
 874 {
 875         blocks.reverse();
 876         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 877                 i->entry = i->block->traverse(i->entry);
 878 }
 879
 880
 881 Train::BlockRef::BlockRef(Block *b, unsigned e):
 882         block(b),
 883         entry(e)
 884 { }
 885
 886 Train::BlockRef Train::BlockRef::next() const
 887 {
 888         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 889         if(!blk)
 890                 throw InvalidState("At end of line");
 891
 892         int ep = blk->get_endpoint_by_link(*block);
 893         if(ep<0)
 894                 throw LogicError("Block links are inconsistent");
 895
 896         return BlockRef(blk, ep);
 897 }
 898
 899
 900 Train::RealSpeed::RealSpeed():
 901         speed(0),
 902         weight(0)
 903 { }
 904
 905 void Train::RealSpeed::add(float s, float w)
 906 {
 907         speed = (speed*weight+s*w)/(weight+w);
 908         weight = min(weight+w, 300.0f);
 909 }
 910
 911
 912 Train::Loader::Loader(Train &t):
 913         DataFile::BasicLoader<Train>(t),
 914         prev_block(0)
 915 {
 916         add("block",       &Loader::block);
 917         add("block_hint",  &Loader::block_hint);
 918         add("name",        &Loader::name);
 919         add("priority",    &Train::priority);
 920         add("real_speed",  &Loader::real_speed);
 921         add("route",       &Loader::route);
 922         add("timetable",   &Loader::timetable);
 923         add("vehicle",     &Loader::vehicle);
 924 }
 925
 926 void Train::Loader::block(unsigned id)
 927 {
 928         Block &blk = obj.layout.get_block(id);
 929         int entry = -1;
 930         if(prev_block)
 931                 entry = blk.get_endpoint_by_link(*prev_block);
 932         if(entry<0)
 933                 entry = 0;
 934
 935         blk.reserve(&obj);
 936         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 937         obj.set_status("Stopped");
 938         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 939         obj.vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 940
 941         if(blk.get_sensor_id())
 942                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 943
 944         prev_block = &blk;
 945 }
 946
 947 void Train::Loader::block_hint(unsigned id)
 948 {
 949         prev_block = &obj.layout.get_block(id);
 950 }
 951
 952 void Train::Loader::name(const string &n)
 953 {
 954         obj.set_name(n);
 955 }
 956
 957 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 958 {
 959         obj.real_speed[i].speed = speed;
 960         obj.real_speed[i].weight = weight;
 961 }
 962
 963 void Train::Loader::route(const string &n)
 964 {
 965         obj.set_route(&obj.layout.get_route(n));
 966 }
 967
 968 void Train::Loader::timetable()
 969 {
 970         if(obj.timetable)
 971                 throw InvalidState("A timetable has already been loaded");
 972
 973         obj.timetable = new Timetable(obj);
 974         load_sub(*obj.timetable);
 975 }
 976
 977 void Train::Loader::vehicle(unsigned n)
 978 {
 979         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 980         Vehicle *veh = new Vehicle(obj.layout, vtype);
 981         obj.vehicles.back()->attach_back(*veh);
 982         obj.vehicles.push_back(veh);
 983 }
 984
 985 } // namespace Marklin