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         control->signal_control_changed.connect(signal_control_changed);
  62 }
  63
  64 Train::~Train()
  65 {
  66         delete control;
  67         delete timetable;
  68         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  69                 delete *i;
  70         layout.remove_train(*this);
  71 }
  72
  73 void Train::set_name(const string &n)
  74 {
  75         name = n;
  76
  77         signal_name_changed.emit(name);
  78 }
  79
  80 Vehicle &Train::get_vehicle(unsigned i)
  81 {
  82         if(i>=vehicles.size())
  83                 throw InvalidParameterValue("Vehicle index out of range");
  84         return *vehicles[i];
  85 }
  86
  87 const Vehicle &Train::get_vehicle(unsigned i) const
  88 {
  89         if(i>=vehicles.size())
  90                 throw InvalidParameterValue("Vehicle index out of range");
  91         return *vehicles[i];
  92 }
  93
  94 void Train::set_control(const string &n, float v)
  95 {
  96         control->set_control(n, v);
  97 }
  98
  99 void Train::set_active(bool a)
 100 {
 101         if(a==active)
 102                 return;
 103         if(!a && control->get_speed())
 104                 throw InvalidState("Can't deactivate while moving");
 105
 106         active = a;
 107         if(active)
 108         {
 109                 stop_timeout = Time::TimeStamp();
 110                 reserve_more();
 111         }
 112         else
 113         {
 114                 stop_timeout = Time::now()+2*Time::sec;
 115                 set_status("Stopped");
 116         }
 117 }
 118
 119 void Train::set_function(unsigned func, bool state)
 120 {
 121         if(!loco_type.get_functions().count(func))
 122                 throw InvalidParameterValue("Invalid function");
 123         if(func<5)
 124                 layout.get_driver().set_loco_function(address, func, state);
 125         else
 126                 layout.get_driver().set_loco_function(address+1, func-4, state);
 127 }
 128
 129 bool Train::get_function(unsigned func) const
 130 {
 131         return (functions>>func)&1;
 132 }
 133
 134 void Train::set_route(const Route *r)
 135 {
 136         if(!rsv_blocks.empty())
 137         {
 138                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 139                         if(i->block->get_sensor_id())
 140                         {
 141                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 142                                 break;
 143                         }
 144         }
 145
 146         route = r;
 147         next_route = 0;
 148         end_of_route = false;
 149
 150         if(route)
 151         {
 152                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 153                 BlockRef next = last.next();
 154                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 155                 if(!route->get_tracks().count(ep.track))
 156                 {
 157                         next_route = route;
 158                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 159                 }
 160         }
 161
 162         if(active)
 163                 reserve_more();
 164
 165         signal_route_changed.emit(route);
 166 }
 167
 168 void Train::go_to(const Track &to)
 169 {
 170         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 171                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 172                 {
 173                         signal_arrived.emit();
 174                         set_route(0);
 175                         return;
 176                 }
 177
 178         BlockRef *last = 0;
 179         if(rsv_blocks.empty())
 180                 last = &cur_blocks.back();
 181         else
 182         {
 183                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 184                         if(i->block->get_sensor_id())
 185                                 last = &*i;
 186         }
 187
 188         BlockRef next = last->next();
 189         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 190
 191         set_route(Route::find(*ep.track, ep.track_ep, to));
 192 }
 193
 194 void Train::place(Block &block, unsigned entry)
 195 {
 196         if(control->get_speed())
 197                 throw InvalidState("Must be stopped before placing");
 198
 199         release_blocks(rsv_blocks);
 200         release_blocks(cur_blocks);
 201
 202         set_active(false);
 203
 204         if(!block.reserve(this))
 205         {
 206                 set_status("Unplaced");
 207                 return;
 208         }
 209
 210         cur_blocks.push_back(BlockRef(&block, entry));
 211         if(reverse)
 212         {
 213                 unsigned exit = block.traverse(entry);
 214                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 215                 Track *track = bep.track->get_link(bep.track_ep);
 216                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 217                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 218         }
 219         else
 220         {
 221                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 222                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 223         }
 224 }
 225
 226 bool Train::free_block(Block &block)
 227 {
 228         unsigned nsens = 0;
 229         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 230         {
 231                 if(i->block==&block)
 232                 {
 233                         if(nsens<1)
 234                                 return false;
 235                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 236                         return true;
 237                 }
 238                 else if(i->block->get_sensor_id())
 239                         ++nsens;
 240         }
 241
 242         return false;
 243 }
 244
 245 int Train::get_entry_to_block(Block &block) const
 246 {
 247         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 248                 if(i->block==&block)
 249                         return i->entry;
 250         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 251                 if(i->block==&block)
 252                         return i->entry;
 253         return -1;
 254 }
 255
 256 float Train::get_reserved_distance() const
 257 {
 258         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 259         const VehicleType &vtype = veh.get_type();
 260
 261         Track *track = veh.get_track();
 262         unsigned entry = veh.get_entry();
 263
 264         float result = -vtype.get_length()/2;
 265         if(reverse)
 266         {
 267                 entry = track->traverse(entry);
 268                 result += veh.get_offset();
 269         }
 270         else
 271                 result -= veh.get_offset();
 272
 273         bool first = true;
 274         list<BlockRef>::const_iterator block = cur_blocks.begin();
 275         while(1)
 276         {
 277                 if(!first || !reverse)
 278                         result += track->get_type().get_path_length(track->get_active_path());
 279                 first = false;
 280
 281                 unsigned exit = track->traverse(entry);
 282                 Track *next = track->get_link(exit);
 283
 284                 while(!block->block->get_tracks().count(next))
 285                 {
 286                         ++block;
 287                         if(block==cur_blocks.end())
 288                                 block = rsv_blocks.begin();
 289                         if(block==rsv_blocks.end())
 290                                 return result;
 291                 }
 292
 293                 entry = next->get_endpoint_by_link(*track);
 294                 track = next;
 295         }
 296 }
 297
 298 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 299 {
 300         if(!active && stop_timeout && t>=stop_timeout)
 301         {
 302                 release_blocks(rsv_blocks);
 303                 end_of_route = false;
 304                 stop_timeout = Time::TimeStamp();
 305         }
 306
 307         if(timetable)
 308                 timetable->tick(t);
 309         control->tick(dt);
 310         float speed = control->get_speed();
 311         unsigned speed_notch = find_speed(abs(speed));
 312
 313         if(speed && (speed<0)!=reverse)
 314         {
 315                 layout.get_driver().set_loco_reverse(address, speed<0);
 316                 reverse = speed<0;
 317
 318                 release_blocks(rsv_blocks);
 319                 reverse_blocks(cur_blocks);
 320
 321                 reserve_more();
 322         }
 323         if(speed_notch!=current_speed && !speed_changing)
 324         {
 325                 speed_changing = true;
 326                 layout.get_driver().set_loco_speed(address, speed_notch);
 327
 328                 pure_speed = false;
 329
 330                 if(speed_notch)
 331                         set_status(format("Traveling %d kmh", get_travel_speed()));
 332                 else
 333                         set_status("Waiting");
 334         }
 335
 336         if(speed)
 337         {
 338                 if(!active)
 339                         set_active(true);
 340
 341                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 342                 Track *track = vehicle.get_track();
 343
 344                 bool ok = false;
 345                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 346                         ok = i->block->get_tracks().count(track);
 347
 348                 if(ok)
 349                 {
 350                         float d = get_real_speed(current_speed)*(dt/Time::sec);
 351                         vehicle.advance(reverse ? -d : d);
 352                 }
 353         }
 354         else if(end_of_route)
 355                 set_route(0);
 356 }
 357
 358 void Train::save(list<DataFile::Statement> &st) const
 359 {
 360         st.push_back((DataFile::Statement("name"), name));
 361         for(unsigned i=0; i<=14; ++i)
 362                 if(real_speed[i].weight)
 363                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 364
 365         if(!cur_blocks.empty())
 366         {
 367                 list<BlockRef> blocks = cur_blocks;
 368                 if(reverse)
 369                         reverse_blocks(blocks);
 370
 371                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 372                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 373
 374                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 375                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 376         }
 377
 378         if(route)
 379                 st.push_back((DataFile::Statement("route"), route->get_name()));
 380
 381         if(timetable)
 382         {
 383                 DataFile::Statement ss("timetable");
 384                 timetable->save(ss.sub);
 385                 st.push_back(ss);
 386         }
 387 }
 388
 389 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 390 {
 391         if(addr==address)
 392         {
 393                 current_speed = speed;
 394                 speed_changing = false;
 395         }
 396 }
 397
 398 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 399 {
 400         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 401         {
 402                 if(addr==address+1)
 403                         func += 4;
 404                 if(state)
 405                         functions |= 1<<func;
 406                 else
 407                         functions &= ~(1<<func);
 408
 409                 signal_function_changed.emit(func, state);
 410         }
 411 }
 412
 413 void Train::sensor_event(unsigned addr, bool state)
 414 {
 415         if(state)
 416         {
 417                 // Find the first sensor block from our reserved blocks that isn't this sensor
 418                 list<BlockRef>::iterator i;
 419                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 420                         if(i->block->get_sensor_id() && i->block->get_sensor_id()!=addr)
 421                                 break;
 422
 423                 if(i!=rsv_blocks.begin())
 424                 {
 425                         // Compute speed and update related state
 426                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 427
 428                         if(pure_speed)
 429                         {
 430                                 RealSpeed &rs = real_speed[current_speed];
 431                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 432                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 433                         }
 434
 435                         travel_dist = 0;
 436                         float block_len;
 437                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 438                         {
 439                                 j->block->traverse(j->entry, &block_len);
 440                                 travel_dist += block_len;
 441
 442                                 if(j->block->get_sensor_id()==addr)
 443                                 {
 444                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 445                                         if(reverse)
 446                                         {
 447                                                 Track *track = bep.track->get_link(bep.track_ep);
 448                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 449                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 450                                         }
 451                                         else
 452                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 453                                 }
 454                         }
 455                         last_entry_time = Time::now();
 456                         pure_speed = true;
 457
 458                         // Check if we've reached the next route
 459                         if(next_route)
 460                         {
 461                                 const set<const Track *> &rtracks = next_route->get_tracks();
 462                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 463                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 464                                         {
 465                                                 route = next_route;
 466                                                 next_route = 0;
 467                                                 // XXX Exceptions?
 468                                                 signal_route_changed.emit(route);
 469                                                 break;
 470                                         }
 471                         }
 472
 473                         // Move blocks up to the next sensor to our current blocks
 474                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 475
 476                         // Try to get more blocks if we're moving
 477                         if(active)
 478                         {
 479                                 unsigned nsens = reserve_more();
 480                                 if(!nsens && end_of_route)
 481                                         signal_arrived.emit();
 482                         }
 483                 }
 484         }
 485         else
 486         {
 487                 // Find the first sensor in our current blocks that's still active
 488                 list<BlockRef>::iterator end = cur_blocks.begin();
 489                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 490                         if(i->block->get_sensor_id())
 491                         {
 492                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 493                                         break;
 494                                 else
 495                                         end = i;
 496                         }
 497
 498                 if(end!=cur_blocks.begin())
 499                 {
 500                         // Free blocks up to the last inactive sensor
 501                         ++end;
 502                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 503                 }
 504         }
 505 }
 506
 507 void Train::turnout_event(unsigned addr, bool)
 508 {
 509         if(pending_block)
 510         {
 511                 unsigned pending_addr = pending_block->get_turnout_id();
 512                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 513                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 514                         reserve_more();
 515         }
 516 }
 517
 518 void Train::block_reserved(const Block &block, const Train *train)
 519 {
 520         if(&block==pending_block && !train)
 521                 reserve_more();
 522 }
 523
 524 unsigned Train::reserve_more()
 525 {
 526         BlockRef *last = 0;
 527         if(!rsv_blocks.empty())
 528                 last = &rsv_blocks.back();
 529         else if(!cur_blocks.empty())
 530                 last = &cur_blocks.back();
 531         if(!last)
 532                 return 0;
 533
 534         pending_block = 0;
 535
 536         // See how many sensor blocks we already have
 537         unsigned nsens = 0;
 538         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 539                 if(i->block->get_sensor_id())
 540                         ++nsens;
 541
 542         if(end_of_route)
 543                 return nsens;
 544
 545         const Route *cur_route = 0;
 546         if(route)
 547         {
 548                 const set<Track *> &tracks = last->block->get_tracks();
 549                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 550                 {
 551                         if(route->get_tracks().count(*i))
 552                                 cur_route = route;
 553                         else if(next_route && next_route->get_tracks().count(*i))
 554                                 cur_route = next_route;
 555                 }
 556         }
 557
 558         bool got_more = false;
 559         BlockRef *good = last;
 560         unsigned good_sens = nsens;
 561         while(good_sens<3)
 562         {
 563                 // Traverse to the next block
 564                 unsigned exit = last->block->traverse(last->entry);
 565                 Block *link = last->block->get_link(exit);
 566                 if(!link)
 567                         break;
 568
 569                 int entry = link->get_endpoint_by_link(*last->block);
 570                 if(entry<0)
 571                         throw LogicError("Block links are inconsistent!");
 572
 573                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 574
 575                 if(cur_route)
 576                 {
 577                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 578                                 cur_route = next_route;
 579                         else if(!cur_route->get_tracks().count(entry_ep.track))
 580                         {
 581                                 // Keep the blocks if we arrived at the end of the route
 582                                 good = last;
 583                                 good_sens = nsens;
 584                                 end_of_route = true;
 585                                 break;
 586                         }
 587                 }
 588                 else if(route && route->get_tracks().count(entry_ep.track))
 589                         cur_route = route;
 590
 591                 if(!link->reserve(this))
 592                 {
 593                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 594                         int other_entry = link->get_train()->get_entry_to_block(*link);
 595                         if(other_entry<0)
 596                                 throw LogicError("Block reservation inconsistency");
 597                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 598                         {
 599                                 good = last;
 600                                 good_sens = nsens;
 601                         }
 602                         pending_block = link;
 603                         break;
 604                 }
 605
 606                 if(link->get_turnout_id())
 607                 {
 608                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 609
 610                         // Keep the blocks reserved so far, as either us or the other train can diverge
 611                         good = last;
 612                         good_sens = nsens;
 613
 614                         // Figure out what path we'd like to take on the turnout
 615                         int path = -1;
 616                         if(cur_route)
 617                                 path = cur_route->get_turnout(link->get_turnout_id());
 618                         if(path<0)
 619                                 path = entry_ep.track->get_active_path();
 620                         if(!((track_ep.paths>>path)&1))
 621                         {
 622                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 623                                         if((track_ep.paths>>i)&1)
 624                                                 path = i;
 625                         }
 626
 627                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 628                         {
 629                                 // The turnout is set to wrong path - switch and wait for it
 630                                 link->reserve(0);
 631                                 pending_block = link;
 632                                 entry_ep.track->set_active_path(path);
 633                                 break;
 634                         }
 635                 }
 636
 637                 rsv_blocks.push_back(BlockRef(link, entry));
 638                 last = &rsv_blocks.back();
 639                 if(last->block->get_sensor_id())
 640                 {
 641                         ++nsens;
 642                         got_more = true;
 643                 }
 644         }
 645
 646         // Unreserve blocks that were not good
 647         while(!rsv_blocks.empty() && last!=good)
 648         {
 649                 last->block->reserve(0);
 650                 rsv_blocks.erase(--rsv_blocks.end());
 651                 if(!rsv_blocks.empty())
 652                         last = &rsv_blocks.back();
 653         }
 654
 655         return good_sens;
 656 }
 657
 658 float Train::get_real_speed(unsigned i) const
 659 {
 660         if(real_speed[i].weight)
 661                 return real_speed[i].speed;
 662
 663         unsigned low;
 664         unsigned high;
 665         for(low=i; low>0; --low)
 666                 if(real_speed[low].weight)
 667                         break;
 668         for(high=i; high<14; ++high)
 669                 if(real_speed[high].weight)
 670                         break;
 671
 672         if(real_speed[high].weight)
 673         {
 674                 if(real_speed[low].weight)
 675                 {
 676                         float f = float(i-low)/(high-low);
 677                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 678                 }
 679                 else
 680                         return real_speed[high].speed*float(i)/high;
 681         }
 682         else if(real_speed[low].weight)
 683                 return real_speed[low].speed*float(i)/low;
 684         else
 685                 return 0;
 686 }
 687
 688 unsigned Train::find_speed(float real) const
 689 {
 690         if(real<=real_speed[0].speed)
 691                 return 0;
 692
 693         unsigned low = 0;
 694         unsigned high = 0;
 695         for(unsigned i=0; (!high && i<=14); ++i)
 696                 if(real_speed[i].weight)
 697                 {
 698                         if(real_speed[i].speed<real)
 699                                 low = i;
 700                         else
 701                                 high = i;
 702                 }
 703         if(!high)
 704         {
 705                 if(!low)
 706                         return 0;
 707                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 708         }
 709
 710         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 711         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 712 }
 713
 714 float Train::get_travel_speed() const
 715 {
 716         float speed = get_real_speed(current_speed);
 717         float scale = layout.get_catalogue().get_scale();
 718         return static_cast<int>(round(speed/scale*3.6/5))*5;
 719 }
 720
 721 void Train::set_status(const string &s)
 722 {
 723         status = s;
 724         signal_status_changed.emit(s);
 725 }
 726
 727 void Train::release_blocks(list<BlockRef> &blocks)
 728 {
 729         release_blocks(blocks, blocks.begin(), blocks.end());
 730 }
 731
 732 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 733 {
 734         while(begin!=end)
 735         {
 736                 Block *block = begin->block;
 737                 blocks.erase(begin++);
 738                 block->reserve(0);
 739         }
 740 }
 741
 742 void Train::reverse_blocks(list<BlockRef> &blocks) const
 743 {
 744         blocks.reverse();
 745         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 746                 i->entry = i->block->traverse(i->entry);
 747 }
 748
 749
 750 Train::BlockRef::BlockRef(Block *b, unsigned e):
 751         block(b),
 752         entry(e)
 753 { }
 754
 755 Train::BlockRef Train::BlockRef::next() const
 756 {
 757         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 758         if(!blk)
 759                 throw InvalidState("At end of line");
 760
 761         int ep = blk->get_endpoint_by_link(*block);
 762         if(ep<0)
 763                 throw LogicError("Block links are inconsistent");
 764
 765         return BlockRef(blk, ep);
 766 }
 767
 768
 769 Train::RealSpeed::RealSpeed():
 770         speed(0),
 771         weight(0)
 772 { }
 773
 774 void Train::RealSpeed::add(float s, float w)
 775 {
 776         speed = (speed*weight+s*w)/(weight+w);
 777         weight = min(weight+w, 300.0f);
 778 }
 779
 780
 781 Train::Loader::Loader(Train &t):
 782         DataFile::BasicLoader<Train>(t),
 783         prev_block(0)
 784 {
 785         add("block",       &Loader::block);
 786         add("block_hint",  &Loader::block_hint);
 787         add("name",        &Loader::name);
 788         add("real_speed",  &Loader::real_speed);
 789         add("route",       &Loader::route);
 790         add("timetable",   &Loader::timetable);
 791         add("vehicle",     &Loader::vehicle);
 792 }
 793
 794 void Train::Loader::block(unsigned id)
 795 {
 796         Block &blk = obj.layout.get_block(id);
 797         int entry = -1;
 798         if(prev_block)
 799                 entry = blk.get_endpoint_by_link(*prev_block);
 800         if(entry<0)
 801                 entry = 0;
 802
 803         blk.reserve(&obj);
 804         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 805         obj.set_status("Stopped");
 806         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 807         obj.vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 808
 809         if(blk.get_sensor_id())
 810                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 811
 812         prev_block = &blk;
 813 }
 814
 815 void Train::Loader::block_hint(unsigned id)
 816 {
 817         prev_block = &obj.layout.get_block(id);
 818 }
 819
 820 void Train::Loader::name(const string &n)
 821 {
 822         obj.set_name(n);
 823 }
 824
 825 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 826 {
 827         obj.real_speed[i].speed = speed;
 828         obj.real_speed[i].weight = weight;
 829 }
 830
 831 void Train::Loader::route(const string &n)
 832 {
 833         obj.set_route(&obj.layout.get_route(n));
 834 }
 835
 836 void Train::Loader::timetable()
 837 {
 838         if(obj.timetable)
 839                 throw InvalidState("A timetable has already been loaded");
 840
 841         obj.timetable = new Timetable(obj);
 842         load_sub(*obj.timetable);
 843 }
 844
 845 void Train::Loader::vehicle(unsigned n)
 846 {
 847         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 848         Vehicle *veh = new Vehicle(obj.layout, vtype);
 849         obj.vehicles.back()->attach_back(*veh);
 850         obj.vehicles.push_back(veh);
 851 }
 852
 853 } // namespace Marklin