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