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 "route.h"
  17 #include "simplecontroller.h"
  18 #include "timetable.h"
  19 #include "tracktype.h"
  20 #include "train.h"
  21 #include "vehicle.h"
  22 #include "vehicletype.h"
  23
  24 using namespace std;
  25 using namespace Msp;
  26
  27 namespace Marklin {
  28
  29 Train::Train(Layout &l, const VehicleType &t, unsigned a):
  30         layout(l),
  31         loco_type(t),
  32         address(a),
  33         priority(0),
  34         pending_block(0),
  35         reserving(false),
  36         advancing(false),
  37         controller(new AIControl(*this, new SimpleController)),
  38         timetable(0),
  39         active(false),
  40         current_speed(0),
  41         speed_changing(false),
  42         reverse(false),
  43         functions(0),
  44         route(0),
  45         next_route(0),
  46         end_of_route(false),
  47         status("Unplaced"),
  48         travel_dist(0),
  49         pure_speed(false),
  50         real_speed(15),
  51         accurate_position(false),
  52         overshoot_dist(false)
  53 {
  54         if(!loco_type.is_locomotive())
  55                 throw InvalidParameterValue("Initial vehicle must be a locomotive");
  56
  57         vehicles.push_back(new Vehicle(layout, loco_type));
  58
  59         layout.add_train(*this);
  60
  61         layout.get_driver().add_loco(address);
  62         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  63         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  64
  65         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  66         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  67         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  68
  69         layout.get_driver().signal_halt.connect(sigc::mem_fun(this, &Train::halt_event));
  70
  71         controller->signal_control_changed.connect(sigc::mem_fun(this, &Train::control_changed));
  72 }
  73
  74 Train::~Train()
  75 {
  76         delete controller;
  77         delete timetable;
  78         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  79                 delete *i;
  80         layout.remove_train(*this);
  81 }
  82
  83 void Train::set_name(const string &n)
  84 {
  85         name = n;
  86
  87         signal_name_changed.emit(name);
  88 }
  89
  90 void Train::set_priority(int p)
  91 {
  92         priority = p;
  93 }
  94
  95 void Train::add_vehicle(const VehicleType &vt)
  96 {
  97         Vehicle *veh = new Vehicle(layout, vt);
  98         vehicles.back()->attach_back(*veh);
  99         vehicles.push_back(veh);
 100 }
 101
 102 void Train::remove_vehicle(unsigned i)
 103 {
 104         if(i>=vehicles.size())
 105                 throw InvalidParameterValue("Vehicle index out of range");
 106         if(i==0)
 107                 throw InvalidParameterValue("Can't remove the locomotive");
 108         delete vehicles[i];
 109         vehicles.erase(vehicles.begin()+i);
 110         if(i<vehicles.size())
 111                 vehicles[i-1]->attach_back(*vehicles[i]);
 112 }
 113
 114 unsigned Train::get_n_vehicles() const
 115 {
 116         return vehicles.size();
 117 }
 118
 119 Vehicle &Train::get_vehicle(unsigned i)
 120 {
 121         if(i>=vehicles.size())
 122                 throw InvalidParameterValue("Vehicle index out of range");
 123         return *vehicles[i];
 124 }
 125
 126 const Vehicle &Train::get_vehicle(unsigned i) const
 127 {
 128         if(i>=vehicles.size())
 129                 throw InvalidParameterValue("Vehicle index out of range");
 130         return *vehicles[i];
 131 }
 132
 133 void Train::set_control(const string &n, float v)
 134 {
 135         controller->set_control(n, v);
 136 }
 137
 138 void Train::set_active(bool a)
 139 {
 140         if(a==active)
 141                 return;
 142         if(!a && controller->get_speed())
 143                 throw InvalidState("Can't deactivate while moving");
 144
 145         active = a;
 146         if(active)
 147         {
 148                 stop_timeout = Time::TimeStamp();
 149                 reserve_more();
 150         }
 151         else
 152         {
 153                 stop_timeout = Time::now()+2*Time::sec;
 154                 set_status("Stopped");
 155         }
 156 }
 157
 158 void Train::set_function(unsigned func, bool state)
 159 {
 160         if(!loco_type.get_functions().count(func))
 161                 throw InvalidParameterValue("Invalid function");
 162         if(func<5)
 163                 layout.get_driver().set_loco_function(address, func, state);
 164         else
 165                 layout.get_driver().set_loco_function(address+1, func-4, state);
 166 }
 167
 168 float Train::get_control(const string &ctrl) const
 169 {
 170         return controller->get_control(ctrl).value;
 171 }
 172
 173 float Train::get_speed() const
 174 {
 175         return controller->get_speed();
 176 }
 177
 178 bool Train::get_function(unsigned func) const
 179 {
 180         return (functions>>func)&1;
 181 }
 182
 183 void Train::set_timetable(Timetable *tt)
 184 {
 185         delete timetable;
 186         timetable = tt;
 187 }
 188
 189 void Train::set_route(const Route *r)
 190 {
 191         if(!rsv_blocks.empty())
 192         {
 193                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 194                         if(i->block->get_sensor_id())
 195                         {
 196                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 197                                 break;
 198                         }
 199         }
 200
 201         route = r;
 202         next_route = 0;
 203         end_of_route = false;
 204
 205         if(route)
 206         {
 207                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 208                 BlockRef next = last.next();
 209                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 210                 if(!route->get_tracks().count(ep.track))
 211                 {
 212                         next_route = route;
 213                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 214                 }
 215         }
 216
 217         reserve_more();
 218
 219         signal_route_changed.emit(route);
 220 }
 221
 222 void Train::go_to(const Track &to)
 223 {
 224         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 225                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 226                 {
 227                         signal_arrived.emit();
 228                         set_route(0);
 229                         return;
 230                 }
 231
 232         BlockRef *last = 0;
 233         if(rsv_blocks.empty())
 234                 last = &cur_blocks.back();
 235         else
 236         {
 237                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 238                         if(i->block->get_sensor_id())
 239                                 last = &*i;
 240         }
 241
 242         BlockRef next = last->next();
 243         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 244
 245         set_route(Route::find(*ep.track, ep.track_ep, to));
 246 }
 247
 248 void Train::place(Block &block, unsigned entry)
 249 {
 250         if(controller->get_speed())
 251                 throw InvalidState("Must be stopped before placing");
 252
 253         release_blocks(rsv_blocks);
 254         release_blocks(cur_blocks);
 255
 256         set_active(false);
 257         accurate_position = false;
 258
 259         if(!block.reserve(this))
 260         {
 261                 set_status("Unplaced");
 262                 return;
 263         }
 264
 265         cur_blocks.push_back(BlockRef(&block, entry));
 266         if(reverse)
 267         {
 268                 unsigned exit = block.traverse(entry);
 269                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 270                 Track *track = bep.track->get_link(bep.track_ep);
 271                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 272                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 273         }
 274         else
 275         {
 276                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 277                 vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 278         }
 279 }
 280
 281 bool Train::free_block(Block &block)
 282 {
 283         unsigned nsens = 0;
 284         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 285         {
 286                 if(i->block==&block)
 287                 {
 288                         if(nsens<1)
 289                                 return false;
 290                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 291                         return true;
 292                 }
 293                 else if(i->block->get_sensor_id())
 294                         ++nsens;
 295         }
 296
 297         return false;
 298 }
 299
 300 int Train::get_entry_to_block(Block &block) const
 301 {
 302         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 303                 if(i->block==&block)
 304                         return i->entry;
 305         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 306                 if(i->block==&block)
 307                         return i->entry;
 308         return -1;
 309 }
 310
 311 float Train::get_reserved_distance() const
 312 {
 313         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 314         const VehicleType &vtype = veh.get_type();
 315
 316         Track *track = veh.get_track();
 317         if(!track)
 318                 return 0;
 319         unsigned entry = veh.get_entry();
 320
 321         float result = -vtype.get_length()/2;
 322         if(reverse)
 323         {
 324                 entry = track->traverse(entry);
 325                 result += veh.get_offset();
 326         }
 327         else
 328                 result -= veh.get_offset();
 329
 330         bool first = true;
 331         list<BlockRef>::const_iterator block = cur_blocks.begin();
 332         while(1)
 333         {
 334                 if(!first || !reverse)
 335                         result += track->get_type().get_path_length(track->get_active_path());
 336                 first = false;
 337
 338                 if(track->get_type().get_endpoints().size()<2)
 339                         return result;
 340
 341                 unsigned exit = track->traverse(entry);
 342                 Track *next = track->get_link(exit);
 343
 344                 while(!block->block->get_tracks().count(next))
 345                 {
 346                         ++block;
 347                         if(block==cur_blocks.end())
 348                                 block = rsv_blocks.begin();
 349                         if(block==rsv_blocks.end())
 350                                 return result;
 351                 }
 352
 353                 entry = next->get_endpoint_by_link(*track);
 354                 track = next;
 355         }
 356 }
 357
 358 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 359 {
 360         if(!active && stop_timeout && t>=stop_timeout)
 361         {
 362                 release_blocks(rsv_blocks);
 363                 end_of_route = false;
 364                 stop_timeout = Time::TimeStamp();
 365         }
 366
 367         Driver &driver = layout.get_driver();
 368
 369         if(timetable)
 370                 timetable->tick(t);
 371         controller->tick(dt);
 372         float speed = controller->get_speed();
 373         unsigned speed_notch = find_speed(speed);
 374
 375         if(controller->get_reverse()!=reverse)
 376         {
 377                 reverse = controller->get_reverse();
 378                 driver.set_loco_reverse(address, reverse);
 379
 380                 release_blocks(rsv_blocks);
 381                 reverse_blocks(cur_blocks);
 382
 383                 reserve_more();
 384         }
 385         if(speed_notch!=current_speed && !speed_changing && !driver.is_halted() && driver.get_power())
 386         {
 387                 speed_changing = true;
 388                 driver.set_loco_speed(address, speed_notch);
 389
 390                 pure_speed = false;
 391
 392                 if(speed_notch)
 393                         set_status(format("Traveling %d kmh", get_travel_speed()));
 394                 else
 395                         set_status("Waiting");
 396         }
 397
 398         if(speed)
 399         {
 400                 if(!active)
 401                         set_active(true);
 402
 403                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 404                 Track *track = vehicle.get_track();
 405
 406                 bool ok = false;
 407                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 408                         ok = i->block->get_tracks().count(track);
 409
 410                 float d = get_real_speed(current_speed)*(dt/Time::sec);
 411                 if(ok)
 412                 {
 413                         advancing = true;
 414                         vehicle.advance(reverse ? -d : d);
 415                         advancing = false;
 416                 }
 417                 else if(accurate_position)
 418                 {
 419                         overshoot_dist += d;
 420                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 421                         {
 422                                 layout.emergency(name+" has not arrived at sensor");
 423                                 accurate_position = false;
 424                         }
 425                 }
 426         }
 427         else if(end_of_route && rsv_blocks.empty())
 428         {
 429                 signal_arrived.emit();
 430                 set_route(0);
 431         }
 432
 433         if(!cur_blocks.empty() && !cur_blocks.front().block->get_sensor_id())
 434         {
 435                 Vehicle &veh = *(reverse ? vehicles.front() : vehicles.back());
 436
 437                 list<BlockRef>::iterator i = cur_blocks.begin();
 438                 const Block::Endpoint &bep = i->block->get_endpoints()[i->entry];
 439
 440                 Track *track = bep.track;
 441                 unsigned entry = bep.track_ep;
 442
 443                 bool found = false;
 444                 float dist = veh.get_offset();
 445                 if(reverse)
 446                         dist = veh.get_track()->get_type().get_path_length(veh.get_track()->get_active_path())-dist;
 447                 dist -= veh.get_type().get_length()/2;
 448                 while(1)
 449                 {
 450                         if(track==veh.get_track())
 451                         {
 452                                 found = true;
 453                                 break;
 454                         }
 455
 456                         if(i!=cur_blocks.begin())
 457                         {
 458                                 float path_len = track->get_type().get_path_length(track->get_active_path());
 459                                 dist += path_len;
 460                         }
 461
 462                         unsigned exit = track->traverse(entry);
 463                         Track *next = track->get_link(exit);
 464                         entry = next->get_endpoint_by_link(*track);
 465                         track = next;
 466
 467                         if(!i->block->get_tracks().count(track))
 468                         {
 469                                 ++i;
 470                                 if(i==cur_blocks.end())
 471                                         break;
 472                         }
 473                 }
 474
 475                 if(found && i!=cur_blocks.begin() && dist>10*layout.get_catalogue().get_scale())
 476                 {
 477                         cur_blocks.front().block->reserve(0);
 478                         cur_blocks.erase(cur_blocks.begin());
 479                 }
 480         }
 481 }
 482
 483 void Train::save(list<DataFile::Statement> &st) const
 484 {
 485         st.push_back((DataFile::Statement("name"), name));
 486
 487         st.push_back((DataFile::Statement("priority"), priority));
 488
 489         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 490                 if(i!=vehicles.begin())
 491                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 492
 493         for(unsigned i=0; i<=14; ++i)
 494                 if(real_speed[i].weight)
 495                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 496
 497         if(!cur_blocks.empty())
 498         {
 499                 list<BlockRef> blocks = cur_blocks;
 500                 if(reverse)
 501                         reverse_blocks(blocks);
 502
 503                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 504                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 505
 506                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 507                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 508         }
 509
 510         if(route)
 511         {
 512                 if(!route->is_temporary())
 513                         st.push_back((DataFile::Statement("route"), route->get_name()));
 514                 else if(next_route && !next_route->is_temporary())
 515                         st.push_back((DataFile::Statement("route"), next_route->get_name()));
 516         }
 517
 518         if(timetable)
 519         {
 520                 DataFile::Statement ss("timetable");
 521                 timetable->save(ss.sub);
 522                 st.push_back(ss);
 523         }
 524 }
 525
 526 void Train::control_changed(const Controller::Control &ctrl)
 527 {
 528         signal_control_changed.emit(ctrl.name, ctrl.value);
 529 }
 530
 531 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 532 {
 533         if(addr==address)
 534         {
 535                 current_speed = speed;
 536                 speed_changing = false;
 537                 pure_speed = false;
 538         }
 539 }
 540
 541 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 542 {
 543         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 544         {
 545                 if(addr==address+1)
 546                         func += 4;
 547                 if(state)
 548                         functions |= 1<<func;
 549                 else
 550                         functions &= ~(1<<func);
 551
 552                 signal_function_changed.emit(func, state);
 553         }
 554 }
 555
 556 void Train::sensor_event(unsigned addr, bool state)
 557 {
 558         if(state)
 559         {
 560                 // Find the first sensor block from our reserved blocks that isn't this sensor
 561                 list<BlockRef>::iterator i;
 562                 unsigned result = 0;
 563                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 564                         if(i->block->get_sensor_id())
 565                         {
 566                                 if(i->block->get_sensor_id()!=addr)
 567                                 {
 568                                         if(result==0)
 569                                                 result = 2;
 570                                         else if(result==1)
 571                                                 break;
 572                                 }
 573                                 else if(result==0)
 574                                         result = 1;
 575                                 else if(result==2)
 576                                         result = 3;
 577                         }
 578
 579                 if(result==1 && i!=rsv_blocks.begin())
 580                 {
 581                         // Compute speed and update related state
 582                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 583
 584                         if(pure_speed)
 585                         {
 586                                 if(current_speed)
 587                                 {
 588                                         RealSpeed &rs = real_speed[current_speed];
 589                                         rs.add(travel_dist/travel_time_secs, travel_time_secs);
 590                                 }
 591                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 592                         }
 593
 594                         travel_dist = 0;
 595                         float block_len;
 596                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 597                         {
 598                                 j->block->traverse(j->entry, &block_len);
 599                                 travel_dist += block_len;
 600
 601                                 if(j->block->get_sensor_id()==addr && !advancing)
 602                                 {
 603                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 604                                         if(reverse)
 605                                         {
 606                                                 Track *track = bep.track->get_link(bep.track_ep);
 607                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 608                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 609                                         }
 610                                         else
 611                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 612                                 }
 613                         }
 614                         last_entry_time = Time::now();
 615                         pure_speed = true;
 616                         accurate_position = true;
 617                         overshoot_dist = 0;
 618
 619                         // Check if we've reached the next route
 620                         if(next_route)
 621                         {
 622                                 const set<const Track *> &rtracks = next_route->get_tracks();
 623                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 624                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 625                                         {
 626                                                 route = next_route;
 627                                                 next_route = 0;
 628                                                 // XXX Exceptions?
 629                                                 signal_route_changed.emit(route);
 630                                                 break;
 631                                         }
 632                         }
 633
 634                         // Move blocks up to the next sensor to our current blocks
 635                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 636
 637                         // Try to get more blocks if we're moving
 638                         if(active)
 639                                 reserve_more();
 640                 }
 641                 else if(result==3)
 642                         layout.emergency("Sensor for "+name+" triggered out of order");
 643         }
 644         else
 645         {
 646                 // Find the first sensor in our current blocks that's still active
 647                 list<BlockRef>::iterator end = cur_blocks.begin();
 648                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 649                         if(i->block->get_sensor_id())
 650                         {
 651                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 652                                         break;
 653                                 else
 654                                 {
 655                                         end = i;
 656                                         ++end;
 657                                 }
 658                         }
 659
 660                 if(end!=cur_blocks.begin())
 661                         // Free blocks up to the last inactive sensor
 662                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 663         }
 664 }
 665
 666 void Train::turnout_event(unsigned addr, bool)
 667 {
 668         if(pending_block)
 669         {
 670                 unsigned pending_addr = pending_block->get_turnout_id();
 671                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 672                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 673                 {
 674                         if(reserving)
 675                                 pending_block = 0;
 676                         else
 677                                 reserve_more();
 678                 }
 679         }
 680 }
 681
 682 void Train::halt_event(bool h)
 683 {
 684         if(h)
 685                 accurate_position = false;
 686 }
 687
 688 void Train::block_reserved(const Block &block, const Train *train)
 689 {
 690         if(&block==pending_block && !train)
 691                 reserve_more();
 692 }
 693
 694 unsigned Train::reserve_more()
 695 {
 696         if(!active)
 697                 return 0;
 698
 699         BlockRef *last = 0;
 700         if(!rsv_blocks.empty())
 701                 last = &rsv_blocks.back();
 702         else if(!cur_blocks.empty())
 703                 last = &cur_blocks.back();
 704         if(!last)
 705                 return 0;
 706
 707         pending_block = 0;
 708
 709         // See how many sensor blocks we already have
 710         unsigned nsens = 0;
 711         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 712                 if(i->block->get_sensor_id())
 713                         ++nsens;
 714
 715         if(end_of_route)
 716                 return nsens;
 717
 718         const Route *cur_route = 0;
 719         if(route)
 720         {
 721                 const set<Track *> &tracks = last->block->get_tracks();
 722                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 723                 {
 724                         if(route->get_tracks().count(*i))
 725                                 cur_route = route;
 726                         else if(next_route && next_route->get_tracks().count(*i))
 727                                 cur_route = next_route;
 728                 }
 729         }
 730
 731         reserving = true;
 732
 733         bool got_more = false;
 734         BlockRef *good = last;
 735         unsigned good_sens = nsens;
 736         while(good_sens<3)
 737         {
 738                 // Traverse to the next block
 739                 unsigned exit = last->block->traverse(last->entry);
 740                 Block *link = last->block->get_link(exit);
 741                 if(!link)
 742                         break;
 743
 744                 int entry = link->get_endpoint_by_link(*last->block);
 745                 if(entry<0)
 746                         throw LogicError("Block links are inconsistent!");
 747
 748                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 749
 750                 if(cur_route)
 751                 {
 752                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 753                                 cur_route = next_route;
 754                         else if(!cur_route->get_tracks().count(entry_ep.track))
 755                         {
 756                                 // Keep the blocks if we arrived at the end of the route
 757                                 good = last;
 758                                 good_sens = nsens;
 759                                 end_of_route = true;
 760                                 break;
 761                         }
 762                 }
 763                 else if(route && route->get_tracks().count(entry_ep.track))
 764                         cur_route = route;
 765
 766                 if(link->get_endpoints().size()<2)
 767                 {
 768                         good = last;
 769                         good_sens = nsens;
 770                         break;
 771                 }
 772
 773                 bool reserved = link->reserve(this);
 774                 if(!reserved)
 775                 {
 776                         // Ask a lesser priority train to free the block for us
 777                         if(link->get_train()->get_priority()<priority)
 778                                 if(link->get_train()->free_block(*link))
 779                                         reserved = link->reserve(this);
 780
 781                         if(!reserved)
 782                         {
 783                                 // If we found another train and it's not headed straight for us, we can keep the blocks we got
 784                                 int other_entry = link->get_train()->get_entry_to_block(*link);
 785                                 if(other_entry<0)
 786                                         throw LogicError("Block reservation inconsistency");
 787                                 if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 788                                 {
 789                                         good = last;
 790                                         good_sens = nsens;
 791                                 }
 792                                 pending_block = link;
 793                                 break;
 794                         }
 795                 }
 796
 797                 if(link->get_turnout_id())
 798                 {
 799                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 800
 801                         // Keep the blocks reserved so far, as either us or the other train can diverge
 802                         good = last;
 803                         good_sens = nsens;
 804
 805                         // Figure out what path we'd like to take on the turnout
 806                         int path = -1;
 807                         if(cur_route)
 808                                 path = cur_route->get_turnout(link->get_turnout_id());
 809                         if(path<0)
 810                                 path = entry_ep.track->get_active_path();
 811                         if(!((track_ep.paths>>path)&1))
 812                         {
 813                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 814                                         if((track_ep.paths>>i)&1)
 815                                                 path = i;
 816                         }
 817
 818                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 819                         {
 820                                 // The turnout is set to wrong path - switch and wait for it
 821                                 pending_block = link;
 822                                 entry_ep.track->set_active_path(path);
 823                                 if(pending_block)
 824                                 {
 825                                         link->reserve(0);
 826                                         break;
 827                                 }
 828                         }
 829                 }
 830
 831                 rsv_blocks.push_back(BlockRef(link, entry));
 832                 last = &rsv_blocks.back();
 833                 if(last->block->get_sensor_id())
 834                 {
 835                         ++nsens;
 836                         got_more = true;
 837                 }
 838         }
 839
 840         // Unreserve blocks that were not good
 841         while(!rsv_blocks.empty() && last!=good)
 842         {
 843                 last->block->reserve(0);
 844                 rsv_blocks.erase(--rsv_blocks.end());
 845                 if(!rsv_blocks.empty())
 846                         last = &rsv_blocks.back();
 847         }
 848
 849         reserving = false;
 850
 851         // Make any sensorless blocks at the beginning immediately current
 852         list<BlockRef>::iterator i;
 853         for(i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !i->block->get_sensor_id()); ++i) ;
 854         if(i!=rsv_blocks.begin())
 855                 cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 856
 857         return good_sens;
 858 }
 859
 860 float Train::get_real_speed(unsigned i) const
 861 {
 862         if(real_speed[i].weight)
 863                 return real_speed[i].speed;
 864
 865         unsigned low;
 866         unsigned high;
 867         for(low=i; low>0; --low)
 868                 if(real_speed[low].weight)
 869                         break;
 870         for(high=i; high<14; ++high)
 871                 if(real_speed[high].weight)
 872                         break;
 873
 874         if(real_speed[high].weight)
 875         {
 876                 if(real_speed[low].weight)
 877                 {
 878                         float f = float(i-low)/(high-low);
 879                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 880                 }
 881                 else
 882                         return real_speed[high].speed*float(i)/high;
 883         }
 884         else if(real_speed[low].weight)
 885                 return real_speed[low].speed*float(i)/low;
 886         else
 887                 return 0;
 888 }
 889
 890 unsigned Train::find_speed(float real) const
 891 {
 892         if(real<=real_speed[0].speed)
 893                 return 0;
 894
 895         unsigned low = 0;
 896         unsigned high = 0;
 897         for(unsigned i=0; (!high && i<=14); ++i)
 898                 if(real_speed[i].weight)
 899                 {
 900                         if(real_speed[i].speed<real)
 901                                 low = i;
 902                         else
 903                                 high = i;
 904                 }
 905         if(!high)
 906         {
 907                 if(!low)
 908                 {
 909                         if(real)
 910                                 return 3;
 911                         else
 912                                 return 0;
 913                 }
 914                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 915         }
 916
 917         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 918         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 919 }
 920
 921 float Train::get_travel_speed() const
 922 {
 923         float speed = get_real_speed(current_speed);
 924         float scale = layout.get_catalogue().get_scale();
 925         return static_cast<int>(round(speed/scale*3.6/5))*5;
 926 }
 927
 928 void Train::set_status(const string &s)
 929 {
 930         status = s;
 931         signal_status_changed.emit(s);
 932 }
 933
 934 void Train::release_blocks(list<BlockRef> &blocks)
 935 {
 936         release_blocks(blocks, blocks.begin(), blocks.end());
 937 }
 938
 939 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 940 {
 941         while(begin!=end)
 942         {
 943                 Block *block = begin->block;
 944                 blocks.erase(begin++);
 945                 block->reserve(0);
 946         }
 947 }
 948
 949 void Train::reverse_blocks(list<BlockRef> &blocks) const
 950 {
 951         blocks.reverse();
 952         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 953                 i->entry = i->block->traverse(i->entry);
 954 }
 955
 956
 957 Train::BlockRef::BlockRef(Block *b, unsigned e):
 958         block(b),
 959         entry(e)
 960 { }
 961
 962 Train::BlockRef Train::BlockRef::next() const
 963 {
 964         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 965         if(!blk)
 966                 throw InvalidState("At end of line");
 967
 968         int ep = blk->get_endpoint_by_link(*block);
 969         if(ep<0)
 970                 throw LogicError("Block links are inconsistent");
 971
 972         return BlockRef(blk, ep);
 973 }
 974
 975
 976 Train::RealSpeed::RealSpeed():
 977         speed(0),
 978         weight(0)
 979 { }
 980
 981 void Train::RealSpeed::add(float s, float w)
 982 {
 983         speed = (speed*weight+s*w)/(weight+w);
 984         weight = min(weight+w, 300.0f);
 985 }
 986
 987
 988 Train::Loader::Loader(Train &t):
 989         DataFile::BasicLoader<Train>(t),
 990         prev_block(0),
 991         blocks_valid(true)
 992 {
 993         add("block",       &Loader::block);
 994         add("block_hint",  &Loader::block_hint);
 995         add("name",        &Loader::name);
 996         add("priority",    &Train::priority);
 997         add("real_speed",  &Loader::real_speed);
 998         add("route",       &Loader::route);
 999         add("timetable",   &Loader::timetable);
1000         add("vehicle",     &Loader::vehicle);
1001 }
1002
1003 void Train::Loader::finish()
1004 {
1005         if(!obj.cur_blocks.empty())
1006         {
1007                 const BlockRef &blkref = obj.cur_blocks.front();
1008                 const Block::Endpoint &bep = blkref.block->get_endpoints()[blkref.entry];
1009                 obj.vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
1010
1011                 obj.set_status("Stopped");
1012         }
1013 }
1014
1015 void Train::Loader::block(unsigned id)
1016 {
1017         if(!blocks_valid)
1018                 return;
1019
1020         Block *blk;
1021         try
1022         {
1023                 blk = &obj.layout.get_block(id);
1024         }
1025         catch(const KeyError &)
1026         {
1027                 blocks_valid = false;
1028                 return;
1029         }
1030
1031         int entry = -1;
1032         if(prev_block)
1033                 entry = blk->get_endpoint_by_link(*prev_block);
1034         if(entry<0)
1035                 entry = 0;
1036
1037         blk->reserve(&obj);
1038         obj.cur_blocks.push_back(BlockRef(blk, entry));
1039
1040         if(blk->get_sensor_id())
1041                 obj.layout.get_driver().set_sensor(blk->get_sensor_id(), true);
1042
1043         prev_block = blk;
1044 }
1045
1046 void Train::Loader::block_hint(unsigned id)
1047 {
1048         try
1049         {
1050                 prev_block = &obj.layout.get_block(id);
1051         }
1052         catch(const KeyError &)
1053         {
1054                 blocks_valid = false;
1055         }
1056 }
1057
1058 void Train::Loader::name(const string &n)
1059 {
1060         obj.set_name(n);
1061 }
1062
1063 void Train::Loader::real_speed(unsigned i, float speed, float weight)
1064 {
1065         obj.real_speed[i].speed = speed;
1066         obj.real_speed[i].weight = weight;
1067 }
1068
1069 void Train::Loader::route(const string &n)
1070 {
1071         obj.set_route(&obj.layout.get_route(n));
1072 }
1073
1074 void Train::Loader::timetable()
1075 {
1076         if(obj.timetable)
1077                 throw InvalidState("A timetable has already been loaded");
1078
1079         obj.timetable = new Timetable(obj);
1080         load_sub(*obj.timetable);
1081 }
1082
1083 void Train::Loader::vehicle(unsigned n)
1084 {
1085         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
1086         Vehicle *veh = new Vehicle(obj.layout, vtype);
1087         obj.vehicles.back()->attach_back(*veh);
1088         obj.vehicles.push_back(veh);
1089 }
1090
1091 } // namespace Marklin