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                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 340                 Track *track = vehicle.get_track();
 341
 342                 bool ok = false;
 343                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 344                         ok = i->block->get_tracks().count(track);
 345
 346                 if(ok)
 347                 {
 348                         float d = get_real_speed(current_speed)*(dt/Time::sec);
 349                         vehicle.advance(reverse ? -d : d);
 350                 }
 351         }
 352         else if(end_of_route)
 353                 set_route(0);
 354 }
 355
 356 void Train::save(list<DataFile::Statement> &st) const
 357 {
 358         st.push_back((DataFile::Statement("name"), name));
 359         for(unsigned i=0; i<=14; ++i)
 360                 if(real_speed[i].weight)
 361                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 362
 363         if(!cur_blocks.empty())
 364         {
 365                 list<BlockRef> blocks = cur_blocks;
 366                 if(reverse)
 367                         reverse_blocks(blocks);
 368
 369                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 370                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 371
 372                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 373                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 374         }
 375
 376         if(route)
 377                 st.push_back((DataFile::Statement("route"), route->get_name()));
 378
 379         if(timetable)
 380         {
 381                 DataFile::Statement ss("timetable");
 382                 timetable->save(ss.sub);
 383                 st.push_back(ss);
 384         }
 385 }
 386
 387 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 388 {
 389         if(addr==address)
 390         {
 391                 current_speed = speed;
 392                 speed_changing = false;
 393         }
 394 }
 395
 396 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 397 {
 398         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 399         {
 400                 if(addr==address+1)
 401                         func += 4;
 402                 if(state)
 403                         functions |= 1<<func;
 404                 else
 405                         functions &= ~(1<<func);
 406
 407                 signal_function_changed.emit(func, state);
 408         }
 409 }
 410
 411 void Train::sensor_event(unsigned addr, bool state)
 412 {
 413         if(state)
 414         {
 415                 // Find the first sensor block from our reserved blocks that isn't this sensor
 416                 list<BlockRef>::iterator i;
 417                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 418                         if(i->block->get_sensor_id() && i->block->get_sensor_id()!=addr)
 419                                 break;
 420
 421                 if(i!=rsv_blocks.begin())
 422                 {
 423                         // Compute speed and update related state
 424                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 425
 426                         if(pure_speed)
 427                         {
 428                                 RealSpeed &rs = real_speed[current_speed];
 429                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 430                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 431                         }
 432
 433                         travel_dist = 0;
 434                         float block_len;
 435                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 436                         {
 437                                 j->block->traverse(j->entry, &block_len);
 438                                 travel_dist += block_len;
 439
 440                                 if(j->block->get_sensor_id()==addr)
 441                                 {
 442                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 443                                         if(reverse)
 444                                         {
 445                                                 Track *track = bep.track->get_link(bep.track_ep);
 446                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 447                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 448                                         }
 449                                         else
 450                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 451                                 }
 452                         }
 453                         last_entry_time = Time::now();
 454                         pure_speed = true;
 455
 456                         // Check if we've reached the next route
 457                         if(next_route)
 458                         {
 459                                 const set<const Track *> &rtracks = next_route->get_tracks();
 460                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 461                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 462                                         {
 463                                                 route = next_route;
 464                                                 next_route = 0;
 465                                                 // XXX Exceptions?
 466                                                 signal_route_changed.emit(route);
 467                                                 break;
 468                                         }
 469                         }
 470
 471                         // Move blocks up to the next sensor to our current blocks
 472                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 473
 474                         // Try to get more blocks if we're moving
 475                         if(active)
 476                         {
 477                                 unsigned nsens = reserve_more();
 478                                 if(!nsens && end_of_route)
 479                                         signal_arrived.emit();
 480                         }
 481                 }
 482         }
 483         else
 484         {
 485                 // Find the first sensor in our current blocks that's still active
 486                 list<BlockRef>::iterator end = cur_blocks.begin();
 487                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 488                         if(i->block->get_sensor_id())
 489                         {
 490                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 491                                         break;
 492                                 else
 493                                         end = i;
 494                         }
 495
 496                 if(end!=cur_blocks.begin())
 497                 {
 498                         // Free blocks up to the last inactive sensor
 499                         ++end;
 500                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 501                 }
 502         }
 503 }
 504
 505 void Train::turnout_event(unsigned addr, bool)
 506 {
 507         if(pending_block)
 508         {
 509                 unsigned pending_addr = pending_block->get_turnout_id();
 510                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 511                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 512                         reserve_more();
 513         }
 514 }
 515
 516 void Train::block_reserved(const Block &block, const Train *train)
 517 {
 518         if(&block==pending_block && !train)
 519                 reserve_more();
 520 }
 521
 522 unsigned Train::reserve_more()
 523 {
 524         BlockRef *last = 0;
 525         if(!rsv_blocks.empty())
 526                 last = &rsv_blocks.back();
 527         else if(!cur_blocks.empty())
 528                 last = &cur_blocks.back();
 529         if(!last)
 530                 return 0;
 531
 532         pending_block = 0;
 533
 534         // See how many sensor blocks we already have
 535         unsigned nsens = 0;
 536         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 537                 if(i->block->get_sensor_id())
 538                         ++nsens;
 539
 540         if(end_of_route)
 541                 return nsens;
 542
 543         const Route *cur_route = 0;
 544         if(route)
 545         {
 546                 const set<Track *> &tracks = last->block->get_tracks();
 547                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 548                 {
 549                         if(route->get_tracks().count(*i))
 550                                 cur_route = route;
 551                         else if(next_route && next_route->get_tracks().count(*i))
 552                                 cur_route = next_route;
 553                 }
 554         }
 555
 556         bool got_more = false;
 557         BlockRef *good = last;
 558         unsigned good_sens = nsens;
 559         while(good_sens<3)
 560         {
 561                 // Traverse to the next block
 562                 unsigned exit = last->block->traverse(last->entry);
 563                 Block *link = last->block->get_link(exit);
 564                 if(!link)
 565                         break;
 566
 567                 int entry = link->get_endpoint_by_link(*last->block);
 568                 if(entry<0)
 569                         throw LogicError("Block links are inconsistent!");
 570
 571                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 572
 573                 if(cur_route)
 574                 {
 575                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 576                                 cur_route = next_route;
 577                         else if(!cur_route->get_tracks().count(entry_ep.track))
 578                         {
 579                                 // Keep the blocks if we arrived at the end of the route
 580                                 good = last;
 581                                 good_sens = nsens;
 582                                 end_of_route = true;
 583                                 break;
 584                         }
 585                 }
 586                 else if(route && route->get_tracks().count(entry_ep.track))
 587                         cur_route = route;
 588
 589                 if(!link->reserve(this))
 590                 {
 591                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 592                         int other_entry = link->get_train()->get_entry_to_block(*link);
 593                         if(other_entry<0)
 594                                 throw LogicError("Block reservation inconsistency");
 595                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 596                         {
 597                                 good = last;
 598                                 good_sens = nsens;
 599                         }
 600                         pending_block = link;
 601                         break;
 602                 }
 603
 604                 if(link->get_turnout_id())
 605                 {
 606                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 607
 608                         // Keep the blocks reserved so far, as either us or the other train can diverge
 609                         good = last;
 610                         good_sens = nsens;
 611
 612                         // Figure out what path we'd like to take on the turnout
 613                         int path = -1;
 614                         if(cur_route)
 615                                 path = cur_route->get_turnout(link->get_turnout_id());
 616                         if(path<0)
 617                                 path = entry_ep.track->get_active_path();
 618                         if(!((track_ep.paths>>path)&1))
 619                         {
 620                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 621                                         if((track_ep.paths>>i)&1)
 622                                                 path = i;
 623                         }
 624
 625                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 626                         {
 627                                 // The turnout is set to wrong path - switch and wait for it
 628                                 link->reserve(0);
 629                                 pending_block = link;
 630                                 entry_ep.track->set_active_path(path);
 631                                 break;
 632                         }
 633                 }
 634
 635                 rsv_blocks.push_back(BlockRef(link, entry));
 636                 last = &rsv_blocks.back();
 637                 if(last->block->get_sensor_id())
 638                 {
 639                         ++nsens;
 640                         got_more = true;
 641                 }
 642         }
 643
 644         // Unreserve blocks that were not good
 645         while(!rsv_blocks.empty() && last!=good)
 646         {
 647                 last->block->reserve(0);
 648                 rsv_blocks.erase(--rsv_blocks.end());
 649                 if(!rsv_blocks.empty())
 650                         last = &rsv_blocks.back();
 651         }
 652
 653         return good_sens;
 654 }
 655
 656 float Train::get_real_speed(unsigned i) const
 657 {
 658         if(real_speed[i].weight)
 659                 return real_speed[i].speed;
 660
 661         unsigned low;
 662         unsigned high;
 663         for(low=i; low>0; --low)
 664                 if(real_speed[low].weight)
 665                         break;
 666         for(high=i; high<14; ++high)
 667                 if(real_speed[high].weight)
 668                         break;
 669
 670         if(real_speed[high].weight)
 671         {
 672                 if(real_speed[low].weight)
 673                 {
 674                         float f = float(i-low)/(high-low);
 675                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 676                 }
 677                 else
 678                         return real_speed[high].speed*float(i)/high;
 679         }
 680         else if(real_speed[low].weight)
 681                 return real_speed[low].speed*float(i)/low;
 682         else
 683                 return 0;
 684 }
 685
 686 unsigned Train::find_speed(float real) const
 687 {
 688         if(real<=real_speed[0].speed)
 689                 return 0;
 690
 691         unsigned low = 0;
 692         unsigned high = 0;
 693         for(unsigned i=0; (!high && i<=14); ++i)
 694                 if(real_speed[i].weight)
 695                 {
 696                         if(real_speed[i].speed<real)
 697                                 low = i;
 698                         else
 699                                 high = i;
 700                 }
 701         if(!high)
 702         {
 703                 if(!low)
 704                         return 0;
 705                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 706         }
 707
 708         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 709         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 710 }
 711
 712 float Train::get_travel_speed() const
 713 {
 714         float speed = get_real_speed(current_speed);
 715         float scale = layout.get_catalogue().get_scale();
 716         return static_cast<int>(round(speed/scale*3.6/5))*5;
 717 }
 718
 719 void Train::set_status(const string &s)
 720 {
 721         status = s;
 722         signal_status_changed.emit(s);
 723 }
 724
 725 void Train::release_blocks(list<BlockRef> &blocks)
 726 {
 727         release_blocks(blocks, blocks.begin(), blocks.end());
 728 }
 729
 730 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 731 {
 732         while(begin!=end)
 733         {
 734                 Block *block = begin->block;
 735                 blocks.erase(begin++);
 736                 block->reserve(0);
 737         }
 738 }
 739
 740 void Train::reverse_blocks(list<BlockRef> &blocks) const
 741 {
 742         blocks.reverse();
 743         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 744                 i->entry = i->block->traverse(i->entry);
 745 }
 746
 747
 748 Train::BlockRef::BlockRef(Block *b, unsigned e):
 749         block(b),
 750         entry(e)
 751 { }
 752
 753 Train::BlockRef Train::BlockRef::next() const
 754 {
 755         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 756         if(!blk)
 757                 throw InvalidState("At end of line");
 758
 759         int ep = blk->get_endpoint_by_link(*block);
 760         if(ep<0)
 761                 throw LogicError("Block links are inconsistent");
 762
 763         return BlockRef(blk, ep);
 764 }
 765
 766
 767 Train::RealSpeed::RealSpeed():
 768         speed(0),
 769         weight(0)
 770 { }
 771
 772 void Train::RealSpeed::add(float s, float w)
 773 {
 774         speed = (speed*weight+s*w)/(weight+w);
 775         weight = min(weight+w, 300.0f);
 776 }
 777
 778
 779 Train::Loader::Loader(Train &t):
 780         DataFile::BasicLoader<Train>(t),
 781         prev_block(0)
 782 {
 783         add("block",       &Loader::block);
 784         add("block_hint",  &Loader::block_hint);
 785         add("name",        &Loader::name);
 786         add("real_speed",  &Loader::real_speed);
 787         add("route",       &Loader::route);
 788         add("timetable",   &Loader::timetable);
 789         add("vehicle",     &Loader::vehicle);
 790 }
 791
 792 void Train::Loader::block(unsigned id)
 793 {
 794         Block &blk = obj.layout.get_block(id);
 795         int entry = -1;
 796         if(prev_block)
 797                 entry = blk.get_endpoint_by_link(*prev_block);
 798         if(entry<0)
 799                 entry = 0;
 800
 801         blk.reserve(&obj);
 802         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 803         obj.set_status("Stopped");
 804         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 805         obj.vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 806
 807         if(blk.get_sensor_id())
 808                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 809
 810         prev_block = &blk;
 811 }
 812
 813 void Train::Loader::block_hint(unsigned id)
 814 {
 815         prev_block = &obj.layout.get_block(id);
 816 }
 817
 818 void Train::Loader::name(const string &n)
 819 {
 820         obj.set_name(n);
 821 }
 822
 823 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 824 {
 825         obj.real_speed[i].speed = speed;
 826         obj.real_speed[i].weight = weight;
 827 }
 828
 829 void Train::Loader::route(const string &n)
 830 {
 831         obj.set_route(&obj.layout.get_route(n));
 832 }
 833
 834 void Train::Loader::timetable()
 835 {
 836         if(obj.timetable)
 837                 throw InvalidState("A timetable has already been loaded");
 838
 839         obj.timetable = new Timetable(obj);
 840         load_sub(*obj.timetable);
 841 }
 842
 843 void Train::Loader::vehicle(unsigned n)
 844 {
 845         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 846         Vehicle *veh = new Vehicle(obj.layout, vtype);
 847         obj.vehicles.back()->attach_back(*veh);
 848         obj.vehicles.push_back(veh);
 849 }
 850
 851 } // namespace Marklin