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