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