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