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         pending_block(0),
  34         control(new AIControl(*this, new SimplePhysics)),
  35         timetable(0),
  36         active(false),
  37         current_speed(0),
  38         speed_changing(false),
  39         reverse(false),
  40         functions(0),
  41         route(0),
  42         next_route(0),
  43         end_of_route(false),
  44         status("Unplaced"),
  45         travel_dist(0),
  46         pure_speed(false),
  47         real_speed(15)
  48 {
  49         vehicles.push_back(new Vehicle(layout, loco_type));
  50
  51         layout.add_train(*this);
  52
  53         layout.get_driver().add_loco(address);
  54         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  55         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  56
  57         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  58         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  59         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  60 }
  61
  62 Train::~Train()
  63 {
  64         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  65                 delete *i;
  66         layout.remove_train(*this);
  67 }
  68
  69 void Train::set_name(const string &n)
  70 {
  71         name = n;
  72
  73         signal_name_changed.emit(name);
  74 }
  75
  76 Vehicle &Train::get_vehicle(unsigned i)
  77 {
  78         if(i>=vehicles.size())
  79                 throw InvalidParameterValue("Vehicle index out of range");
  80         return *vehicles[i];
  81 }
  82
  83 const Vehicle &Train::get_vehicle(unsigned i) const
  84 {
  85         if(i>=vehicles.size())
  86                 throw InvalidParameterValue("Vehicle index out of range");
  87         return *vehicles[i];
  88 }
  89
  90 void Train::set_control(const string &n, float v)
  91 {
  92         control->set_control(n, v);
  93         signal_control_changed.emit(n, control->get_control(n).value);
  94 }
  95
  96 void Train::set_active(bool a)
  97 {
  98         if(a==active)
  99                 return;
 100         if(!a && control->get_speed())
 101                 throw InvalidState("Can't deactivate while moving");
 102
 103         active = a;
 104         if(active)
 105         {
 106                 stop_timeout = Time::TimeStamp();
 107                 reserve_more();
 108         }
 109         else
 110         {
 111                 stop_timeout = Time::now()+2*Time::sec;
 112                 set_status("Stopped");
 113         }
 114 }
 115
 116 void Train::set_function(unsigned func, bool state)
 117 {
 118         if(!loco_type.get_functions().count(func))
 119                 throw InvalidParameterValue("Invalid function");
 120         if(func<5)
 121                 layout.get_driver().set_loco_function(address, func, state);
 122         else
 123                 layout.get_driver().set_loco_function(address+1, func-4, state);
 124 }
 125
 126 bool Train::get_function(unsigned func) const
 127 {
 128         return (functions>>func)&1;
 129 }
 130
 131 void Train::set_route(const Route *r)
 132 {
 133         if(!rsv_blocks.empty())
 134         {
 135                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 136                         if(i->block->get_sensor_id())
 137                         {
 138                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 139                                 break;
 140                         }
 141         }
 142
 143         route = r;
 144         next_route = 0;
 145         end_of_route = false;
 146
 147         if(route)
 148         {
 149                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 150                 BlockRef next = last.next();
 151                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 152                 if(!route->get_tracks().count(ep.track))
 153                 {
 154                         next_route = route;
 155                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 156                 }
 157         }
 158
 159         if(active)
 160                 reserve_more();
 161
 162         signal_route_changed.emit(route);
 163 }
 164
 165 void Train::go_to(const Track &to)
 166 {
 167         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 168                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 169                 {
 170                         signal_arrived.emit();
 171                         set_route(0);
 172                         return;
 173                 }
 174
 175         BlockRef *last = 0;
 176         if(rsv_blocks.empty())
 177                 last = &cur_blocks.back();
 178         else
 179         {
 180                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 181                         if(i->block->get_sensor_id())
 182                                 last = &*i;
 183         }
 184
 185         BlockRef next = last->next();
 186         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 187
 188         set_route(Route::find(*ep.track, ep.track_ep, to));
 189 }
 190
 191 void Train::place(Block &block, unsigned entry)
 192 {
 193         if(control->get_speed())
 194                 throw InvalidState("Must be stopped before placing");
 195
 196         release_blocks(rsv_blocks);
 197         release_blocks(cur_blocks);
 198
 199         set_active(false);
 200
 201         if(!block.reserve(this))
 202         {
 203                 set_status("Unplaced");
 204                 return;
 205         }
 206
 207         cur_blocks.push_back(BlockRef(&block, entry));
 208         if(reverse)
 209         {
 210                 unsigned exit = block.traverse(entry);
 211                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 212                 Track *track = bep.track->get_link(bep.track_ep);
 213                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 214                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 215         }
 216         else
 217         {
 218                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 219                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 220         }
 221 }
 222
 223 bool Train::free_block(Block &block)
 224 {
 225         unsigned nsens = 0;
 226         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 227         {
 228                 if(i->block==&block)
 229                 {
 230                         if(nsens<1)
 231                                 return false;
 232                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 233                         return true;
 234                 }
 235                 else if(i->block->get_sensor_id())
 236                         ++nsens;
 237         }
 238
 239         return false;
 240 }
 241
 242 int Train::get_entry_to_block(Block &block) const
 243 {
 244         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 245                 if(i->block==&block)
 246                         return i->entry;
 247         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 248                 if(i->block==&block)
 249                         return i->entry;
 250         return -1;
 251 }
 252
 253 float Train::get_reserved_distance() const
 254 {
 255         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 256         const VehicleType &vtype = veh.get_type();
 257
 258         Track *track = veh.get_track();
 259         unsigned entry = veh.get_entry();
 260
 261         float result = -vtype.get_length()/2;
 262         if(reverse)
 263         {
 264                 entry = track->traverse(entry);
 265                 result += veh.get_offset();
 266         }
 267         else
 268                 result -= veh.get_offset();
 269
 270         bool first = true;
 271         list<BlockRef>::const_iterator block = cur_blocks.begin();
 272         while(1)
 273         {
 274                 if(!first || !reverse)
 275                         result += track->get_type().get_path_length(track->get_active_path());
 276                 first = false;
 277
 278                 unsigned exit = track->traverse(entry);
 279                 Track *next = track->get_link(exit);
 280
 281                 while(!block->block->get_tracks().count(next))
 282                 {
 283                         ++block;
 284                         if(block==cur_blocks.end())
 285                                 block = rsv_blocks.begin();
 286                         if(block==rsv_blocks.end())
 287                                 return result;
 288                 }
 289
 290                 entry = next->get_endpoint_by_link(*track);
 291                 track = next;
 292         }
 293 }
 294
 295 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 296 {
 297         if(!active && stop_timeout && t>=stop_timeout)
 298         {
 299                 release_blocks(rsv_blocks);
 300                 end_of_route = false;
 301                 stop_timeout = Time::TimeStamp();
 302         }
 303
 304         if(timetable)
 305                 timetable->tick(t);
 306         control->tick(dt);
 307         float speed = control->get_speed();
 308         unsigned speed_notch = find_speed(abs(speed));
 309
 310         if(speed && (speed<0)!=reverse)
 311         {
 312                 layout.get_driver().set_loco_reverse(address, speed<0);
 313                 reverse = speed<0;
 314
 315                 release_blocks(rsv_blocks);
 316                 reverse_blocks(cur_blocks);
 317
 318                 reserve_more();
 319         }
 320         if(speed_notch!=current_speed && !speed_changing)
 321         {
 322                 speed_changing = true;
 323                 layout.get_driver().set_loco_speed(address, speed_notch);
 324
 325                 pure_speed = false;
 326
 327                 if(speed_notch)
 328                         set_status(format("Traveling %d kmh", get_travel_speed()));
 329                 else
 330                         set_status("Waiting");
 331         }
 332
 333         if(speed)
 334         {
 335                 if(!active)
 336                         set_active(true);
 337
 338                 Track *track = vehicles[0]->get_track();
 339
 340                 bool ok = false;
 341                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 342                         ok = i->block->get_tracks().count(track);
 343
 344                 if(ok)
 345                 {
 346                         float d = get_real_speed(current_speed)*(dt/Time::sec);
 347                         vehicles[0]->advance(reverse ? -d : d);
 348                 }
 349         }
 350         else if(end_of_route)
 351                 set_route(0);
 352 }
 353
 354 void Train::save(list<DataFile::Statement> &st) const
 355 {
 356         st.push_back((DataFile::Statement("name"), name));
 357         for(unsigned i=0; i<=14; ++i)
 358                 if(real_speed[i].weight)
 359                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 360
 361         if(!cur_blocks.empty())
 362         {
 363                 list<BlockRef> blocks = cur_blocks;
 364                 if(reverse)
 365                         reverse_blocks(blocks);
 366
 367                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 368                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 369
 370                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 371                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 372         }
 373
 374         if(route)
 375                 st.push_back((DataFile::Statement("route"), route->get_name()));
 376
 377         if(timetable)
 378         {
 379                 DataFile::Statement ss("timetable");
 380                 timetable->save(ss.sub);
 381                 st.push_back(ss);
 382         }
 383 }
 384
 385 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 386 {
 387         if(addr==address)
 388         {
 389                 current_speed = speed;
 390                 speed_changing = false;
 391         }
 392 }
 393
 394 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 395 {
 396         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 397         {
 398                 if(addr==address+1)
 399                         func += 4;
 400                 if(state)
 401                         functions |= 1<<func;
 402                 else
 403                         functions &= ~(1<<func);
 404
 405                 signal_function_changed.emit(func, state);
 406         }
 407 }
 408
 409 void Train::sensor_event(unsigned addr, bool state)
 410 {
 411         if(state)
 412         {
 413                 // Find the first sensor block from our reserved blocks that isn't this sensor
 414                 list<BlockRef>::iterator i;
 415                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 416                         if(i->block->get_sensor_id() && i->block->get_sensor_id()!=addr)
 417                                 break;
 418
 419                 if(i!=rsv_blocks.begin())
 420                 {
 421                         // Compute speed and update related state
 422                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 423
 424                         if(pure_speed)
 425                         {
 426                                 RealSpeed &rs = real_speed[current_speed];
 427                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 428                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 429                         }
 430
 431                         travel_dist = 0;
 432                         float block_len;
 433                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 434                         {
 435                                 j->block->traverse(j->entry, &block_len);
 436                                 travel_dist += block_len;
 437
 438                                 if(j->block->get_sensor_id()==addr)
 439                                 {
 440                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 441                                         if(reverse)
 442                                         {
 443                                                 Track *track = bep.track->get_link(bep.track_ep);
 444                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 445                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 446                                         }
 447                                         else
 448                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 449                                 }
 450                         }
 451                         last_entry_time = Time::now();
 452                         pure_speed = true;
 453
 454                         // Check if we've reached the next route
 455                         if(next_route)
 456                         {
 457                                 const set<const Track *> &rtracks = next_route->get_tracks();
 458                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 459                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 460                                         {
 461                                                 route = next_route;
 462                                                 next_route = 0;
 463                                                 // XXX Exceptions?
 464                                                 signal_route_changed.emit(route);
 465                                                 break;
 466                                         }
 467                         }
 468
 469                         // Move blocks up to the next sensor to our current blocks
 470                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 471
 472                         // Try to get more blocks if we're moving
 473                         if(active)
 474                         {
 475                                 unsigned nsens = reserve_more();
 476                                 if(!nsens && end_of_route)
 477                                         signal_arrived.emit();
 478                         }
 479                 }
 480         }
 481         else
 482         {
 483                 // Find the first sensor in our current blocks that's still active
 484                 list<BlockRef>::iterator end = cur_blocks.begin();
 485                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 486                         if(i->block->get_sensor_id())
 487                         {
 488                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 489                                         break;
 490                                 else
 491                                         end = i;
 492                         }
 493
 494                 if(end!=cur_blocks.begin())
 495                 {
 496                         // Free blocks up to the last inactive sensor
 497                         ++end;
 498                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 499                 }
 500         }
 501 }
 502
 503 void Train::turnout_event(unsigned addr, bool)
 504 {
 505         if(pending_block)
 506         {
 507                 unsigned pending_addr = pending_block->get_turnout_id();
 508                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 509                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 510                         reserve_more();
 511         }
 512 }
 513
 514 void Train::block_reserved(const Block &block, const Train *train)
 515 {
 516         if(&block==pending_block && !train)
 517                 reserve_more();
 518 }
 519
 520 unsigned Train::reserve_more()
 521 {
 522         BlockRef *last = 0;
 523         if(!rsv_blocks.empty())
 524                 last = &rsv_blocks.back();
 525         else if(!cur_blocks.empty())
 526                 last = &cur_blocks.back();
 527         if(!last)
 528                 return 0;
 529
 530         pending_block = 0;
 531
 532         // See how many sensor blocks we already have
 533         unsigned nsens = 0;
 534         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 535                 if(i->block->get_sensor_id())
 536                         ++nsens;
 537
 538         if(end_of_route)
 539                 return nsens;
 540
 541         const Route *cur_route = 0;
 542         if(route)
 543         {
 544                 const set<Track *> &tracks = last->block->get_tracks();
 545                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 546                 {
 547                         if(route->get_tracks().count(*i))
 548                                 cur_route = route;
 549                         else if(next_route && next_route->get_tracks().count(*i))
 550                                 cur_route = next_route;
 551                 }
 552         }
 553
 554         bool got_more = false;
 555         BlockRef *good = last;
 556         unsigned good_sens = nsens;
 557         while(good_sens<3)
 558         {
 559                 // Traverse to the next block
 560                 unsigned exit = last->block->traverse(last->entry);
 561                 Block *link = last->block->get_link(exit);
 562                 if(!link)
 563                         break;
 564
 565                 int entry = link->get_endpoint_by_link(*last->block);
 566                 if(entry<0)
 567                         throw LogicError("Block links are inconsistent!");
 568
 569                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 570
 571                 if(cur_route)
 572                 {
 573                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 574                                 cur_route = next_route;
 575                         else if(!cur_route->get_tracks().count(entry_ep.track))
 576                         {
 577                                 // Keep the blocks if we arrived at the end of the route
 578                                 good = last;
 579                                 good_sens = nsens;
 580                                 end_of_route = true;
 581                                 break;
 582                         }
 583                 }
 584                 else if(route && route->get_tracks().count(entry_ep.track))
 585                         cur_route = route;
 586
 587                 if(!link->reserve(this))
 588                 {
 589                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 590                         int other_entry = link->get_train()->get_entry_to_block(*link);
 591                         if(other_entry<0)
 592                                 throw LogicError("Block reservation inconsistency");
 593                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 594                         {
 595                                 good = last;
 596                                 good_sens = nsens;
 597                         }
 598                         pending_block = link;
 599                         break;
 600                 }
 601
 602                 if(link->get_turnout_id())
 603                 {
 604                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 605
 606                         // Keep the blocks reserved so far, as either us or the other train can diverge
 607                         good = last;
 608                         good_sens = nsens;
 609
 610                         // Figure out what path we'd like to take on the turnout
 611                         int path = -1;
 612                         if(cur_route)
 613                                 path = cur_route->get_turnout(link->get_turnout_id());
 614                         if(path<0)
 615                                 path = entry_ep.track->get_active_path();
 616                         if(!((track_ep.paths>>path)&1))
 617                         {
 618                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 619                                         if((track_ep.paths>>i)&1)
 620                                                 path = i;
 621                         }
 622
 623                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 624                         {
 625                                 // The turnout is set to wrong path - switch and wait for it
 626                                 link->reserve(0);
 627                                 pending_block = link;
 628                                 entry_ep.track->set_active_path(path);
 629                                 break;
 630                         }
 631                 }
 632
 633                 rsv_blocks.push_back(BlockRef(link, entry));
 634                 last = &rsv_blocks.back();
 635                 if(last->block->get_sensor_id())
 636                 {
 637                         ++nsens;
 638                         got_more = true;
 639                 }
 640         }
 641
 642         // Unreserve blocks that were not good
 643         while(!rsv_blocks.empty() && last!=good)
 644         {
 645                 last->block->reserve(0);
 646                 rsv_blocks.erase(--rsv_blocks.end());
 647                 if(!rsv_blocks.empty())
 648                         last = &rsv_blocks.back();
 649         }
 650
 651         return good_sens;
 652 }
 653
 654 float Train::get_real_speed(unsigned i) const
 655 {
 656         if(real_speed[i].weight)
 657                 return real_speed[i].speed;
 658
 659         unsigned low;
 660         unsigned high;
 661         for(low=i; low>0; --low)
 662                 if(real_speed[low].weight)
 663                         break;
 664         for(high=i; high<14; ++high)
 665                 if(real_speed[high].weight)
 666                         break;
 667
 668         if(real_speed[high].weight)
 669         {
 670                 if(real_speed[low].weight)
 671                 {
 672                         float f = float(i-low)/(high-low);
 673                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 674                 }
 675                 else
 676                         return real_speed[high].speed*float(i)/high;
 677         }
 678         else if(real_speed[low].weight)
 679                 return real_speed[low].speed*float(i)/low;
 680         else
 681                 return 0;
 682 }
 683
 684 unsigned Train::find_speed(float real) const
 685 {
 686         if(real<=real_speed[0].speed)
 687                 return 0;
 688
 689         unsigned low = 0;
 690         unsigned high = 0;
 691         for(unsigned i=0; (!high && i<=14); ++i)
 692                 if(real_speed[i].weight)
 693                 {
 694                         if(real_speed[i].speed<real)
 695                                 low = i;
 696                         else
 697                                 high = i;
 698                 }
 699         if(!high)
 700         {
 701                 if(!low)
 702                         return 0;
 703                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 704         }
 705
 706         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 707         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 708 }
 709
 710 float Train::get_travel_speed() const
 711 {
 712         float speed = get_real_speed(current_speed);
 713         float scale = layout.get_catalogue().get_scale();
 714         return static_cast<int>(round(speed/scale*3.6/5))*5;
 715 }
 716
 717 void Train::set_status(const string &s)
 718 {
 719         status = s;
 720         signal_status_changed.emit(s);
 721 }
 722
 723 void Train::release_blocks(list<BlockRef> &blocks)
 724 {
 725         release_blocks(blocks, blocks.begin(), blocks.end());
 726 }
 727
 728 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 729 {
 730         while(begin!=end)
 731         {
 732                 Block *block = begin->block;
 733                 blocks.erase(begin++);
 734                 block->reserve(0);
 735         }
 736 }
 737
 738 void Train::reverse_blocks(list<BlockRef> &blocks) const
 739 {
 740         blocks.reverse();
 741         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 742                 i->entry = i->block->traverse(i->entry);
 743 }
 744
 745
 746 Train::BlockRef::BlockRef(Block *b, unsigned e):
 747         block(b),
 748         entry(e)
 749 { }
 750
 751 Train::BlockRef Train::BlockRef::next() const
 752 {
 753         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 754         if(!blk)
 755                 throw InvalidState("At end of line");
 756
 757         int ep = blk->get_endpoint_by_link(*block);
 758         if(ep<0)
 759                 throw LogicError("Block links are inconsistent");
 760
 761         return BlockRef(blk, ep);
 762 }
 763
 764
 765 Train::RealSpeed::RealSpeed():
 766         speed(0),
 767         weight(0)
 768 { }
 769
 770 void Train::RealSpeed::add(float s, float w)
 771 {
 772         speed = (speed*weight+s*w)/(weight+w);
 773         weight = min(weight+w, 300.0f);
 774 }
 775
 776
 777 Train::Loader::Loader(Train &t):
 778         DataFile::BasicLoader<Train>(t),
 779         prev_block(0)
 780 {
 781         add("block",       &Loader::block);
 782         add("block_hint",  &Loader::block_hint);
 783         add("name",        &Loader::name);
 784         add("real_speed",  &Loader::real_speed);
 785         add("route",       &Loader::route);
 786         add("timetable",   &Loader::timetable);
 787 }
 788
 789 void Train::Loader::block(unsigned id)
 790 {
 791         Block &blk = obj.layout.get_block(id);
 792         int entry = -1;
 793         if(prev_block)
 794                 entry = blk.get_endpoint_by_link(*prev_block);
 795         if(entry<0)
 796                 entry = 0;
 797
 798         blk.reserve(&obj);
 799         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 800         obj.set_status("Stopped");
 801         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 802         obj.vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 803
 804         if(blk.get_sensor_id())
 805                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 806
 807         prev_block = &blk;
 808 }
 809
 810 void Train::Loader::block_hint(unsigned id)
 811 {
 812         prev_block = &obj.layout.get_block(id);
 813 }
 814
 815 void Train::Loader::name(const string &n)
 816 {
 817         obj.set_name(n);
 818 }
 819
 820 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 821 {
 822         obj.real_speed[i].speed = speed;
 823         obj.real_speed[i].weight = weight;
 824 }
 825
 826 void Train::Loader::route(const string &n)
 827 {
 828         obj.set_route(&obj.layout.get_route(n));
 829 }
 830
 831 void Train::Loader::timetable()
 832 {
 833         if(obj.timetable)
 834                 throw InvalidState("A timetable has already been loaded");
 835
 836         obj.timetable = new Timetable(obj);
 837         load_sub(*obj.timetable);
 838 }
 839
 840 } // namespace Marklin