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