source/libr2c2/train.cpp

   1 #include <algorithm>
   2 #include <cmath>
   3 #include <msp/core/maputils.h>
   4 #include <msp/strings/format.h>
   5 #include <msp/time/units.h>
   6 #include <msp/time/utils.h>
   7 #include "aicontrol.h"
   8 #include "catalogue.h"
   9 #include "driver.h"
  10 #include "layout.h"
  11 #include "route.h"
  12 #include "simplecontroller.h"
  13 #include "speedquantizer.h"
  14 #include "timetable.h"
  15 #include "trackiter.h"
  16 #include "tracktype.h"
  17 #include "train.h"
  18 #include "trainrouter.h"
  19 #include "vehicle.h"
  20 #include "vehicletype.h"
  21 #include "zone.h"
  22
  23 using namespace std;
  24 using namespace Msp;
  25
  26 namespace {
  27
  28 struct SetFlag
  29 {
  30         bool &flag;
  31
  32         SetFlag(bool &f): flag(f) { flag = true; }
  33         ~SetFlag() { flag = false; }
  34 };
  35
  36 }
  37
  38
  39 namespace R2C2 {
  40
  41 Train::Train(Layout &l, const VehicleType &t, unsigned a, const string &p):
  42         layout(l),
  43         loco_type(t),
  44         address(a),
  45         protocol(p),
  46         preceding_train(0),
  47         cur_blocks_end(blocks.end()),
  48         pending_block(0),
  49         reserving(false),
  50         advancing(false),
  51         controller(new SimpleController),
  52         active(false),
  53         current_speed_step(0),
  54         speed_changing(false),
  55         reverse(false),
  56         functions(0),
  57         travel_dist(0),
  58         pure_speed(false),
  59         speed_quantizer(0),
  60         accurate_position(false),
  61         overshoot_dist(false)
  62 {
  63         if(!loco_type.is_locomotive())
  64                 throw invalid_argument("Train::Train");
  65
  66         unsigned speed_steps = layout.get_driver().get_protocol_speed_steps(protocol);
  67         if(speed_steps)
  68                 speed_quantizer = new SpeedQuantizer(speed_steps);
  69
  70         vehicles.push_back(new Vehicle(layout, loco_type));
  71
  72         layout.add_train(*this);
  73
  74         layout.get_driver().add_loco(address, protocol, loco_type);
  75         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  76         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  77
  78         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  79         layout.signal_block_state_changed.connect(sigc::mem_fun(this, &Train::block_state_changed));
  80
  81         layout.get_driver().signal_halt.connect(sigc::mem_fun(this, &Train::halt_event));
  82
  83         const set<Track *> &tracks = layout.get_tracks();
  84         for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
  85                 if((*i)->get_turnout_id())
  86                         (*i)->signal_path_changed.connect(sigc::hide(sigc::bind(sigc::mem_fun(this, &Train::turnout_path_changed), sigc::ref(**i))));
  87
  88         controller->signal_control_changed.connect(sigc::mem_fun(this, &Train::control_changed));
  89 }
  90
  91 Train::~Train()
  92 {
  93         delete controller;
  94         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  95                 delete *i;
  96         layout.remove_train(*this);
  97 }
  98
  99 void Train::set_name(const string &n)
 100 {
 101         name = n;
 102
 103         signal_name_changed.emit(name);
 104 }
 105
 106 void Train::add_vehicle(const VehicleType &vt)
 107 {
 108         Vehicle *veh = new Vehicle(layout, vt);
 109         vehicles.back()->attach_back(*veh);
 110         vehicles.push_back(veh);
 111 }
 112
 113 void Train::remove_vehicle(unsigned i)
 114 {
 115         if(i>=vehicles.size())
 116                 throw out_of_range("Train::remove_vehicle");
 117         if(i==0)
 118                 throw logic_error("can't remove locomotive");
 119         delete vehicles[i];
 120         vehicles.erase(vehicles.begin()+i);
 121         if(i<vehicles.size())
 122                 vehicles[i-1]->attach_back(*vehicles[i]);
 123 }
 124
 125 unsigned Train::get_n_vehicles() const
 126 {
 127         return vehicles.size();
 128 }
 129
 130 Vehicle &Train::get_vehicle(unsigned i)
 131 {
 132         if(i>=vehicles.size())
 133                 throw out_of_range("Train::get_vehicle");
 134         return *vehicles[i];
 135 }
 136
 137 const Vehicle &Train::get_vehicle(unsigned i) const
 138 {
 139         if(i>=vehicles.size())
 140                 throw out_of_range("Train::get_vehicle");
 141         return *vehicles[i];
 142 }
 143
 144 void Train::set_control(const string &n, float v)
 145 {
 146         controller->set_control(n, v);
 147 }
 148
 149 void Train::set_active(bool a)
 150 {
 151         if(a==active)
 152                 return;
 153         if(!a && controller->get_speed())
 154                 throw logic_error("moving");
 155
 156         active = a;
 157         if(active)
 158         {
 159                 stop_timeout = Time::TimeStamp();
 160                 reserve_more();
 161         }
 162         else
 163                 stop_timeout = Time::now()+2*Time::sec;
 164 }
 165
 166 void Train::set_function(unsigned func, bool state)
 167 {
 168         if(!loco_type.get_functions().count(func))
 169                 throw invalid_argument("Train::set_function");
 170         layout.get_driver().set_loco_function(address, func, state);
 171 }
 172
 173 float Train::get_control(const string &ctrl) const
 174 {
 175         return controller->get_control(ctrl).value;
 176 }
 177
 178 float Train::get_speed() const
 179 {
 180         return controller->get_speed();
 181 }
 182
 183 float Train::get_quantized_speed() const
 184 {
 185         if(speed_quantizer)
 186                 return speed_quantizer->quantize_speed(controller->get_speed());
 187         else
 188                 return controller->get_speed();
 189 }
 190
 191 bool Train::get_function(unsigned func) const
 192 {
 193         return (functions>>func)&1;
 194 }
 195
 196 void Train::add_ai(TrainAI &ai)
 197 {
 198         ais.push_back(&ai);
 199         ai.signal_event.connect(sigc::bind<0>(signal_ai_event, sigc::ref(ai)));
 200 }
 201
 202 void Train::remove_ai(TrainAI &ai)
 203 {
 204         list<TrainAI *>::iterator i = find(ais.begin(), ais.end(), &ai);
 205         if(i!=ais.end())
 206                 ais.erase(i);
 207 }
 208
 209 void Train::ai_message(const TrainAI::Message &msg)
 210 {
 211         for(list<TrainAI *>::iterator i=ais.begin(); i!=ais.end(); ++i)
 212                 (*i)->message(msg);
 213 }
 214
 215 void Train::place(Block &block, unsigned entry)
 216 {
 217         if(controller->get_speed())
 218                 throw logic_error("moving");
 219
 220         release_blocks();
 221
 222         set_active(false);
 223         accurate_position = false;
 224
 225         blocks.push_back(BlockIter(&block, entry));
 226         if(!block.reserve(this))
 227         {
 228                 blocks.pop_back();
 229                 return;
 230         }
 231
 232         if(reverse)
 233         {
 234                 TrackIter track = BlockIter(&block, entry).reverse().track_iter();
 235                 vehicles.front()->place(*track, track.entry(), 0, Vehicle::FRONT_BUFFER);
 236         }
 237         else
 238         {
 239                 const Block::Endpoint &bep = block.get_endpoint(entry);
 240                 vehicles.back()->place(*bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 241         }
 242 }
 243
 244 void Train::unplace()
 245 {
 246         if(controller->get_speed())
 247                 throw logic_error("moving");
 248
 249         release_blocks();
 250
 251         set_active(false);
 252         accurate_position = false;
 253
 254         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 255                 (*i)->unplace();
 256 }
 257
 258 void Train::stop_at(Block *block)
 259 {
 260         stop_at_block = block;
 261         if(active && !stop_at_block)
 262                 reserve_more();
 263 }
 264
 265 bool Train::free_block(Block &block)
 266 {
 267         if(get_reserved_distance_until(&block, false)<controller->get_braking_distance()*1.3)
 268                 return false;
 269
 270         unsigned nsens = 0;
 271         for(BlockList::iterator i=cur_blocks_end; i!=blocks.end(); ++i)
 272         {
 273                 if(i->block()==&block)
 274                 {
 275                         if(nsens<1)
 276                                 return false;
 277                         release_blocks(i, blocks.end());
 278                         return true;
 279                 }
 280                 else if((*i)->get_sensor_id())
 281                         ++nsens;
 282         }
 283
 284         return false;
 285 }
 286
 287 void Train::free_noncritical_blocks()
 288 {
 289         if(blocks.empty())
 290                 return;
 291
 292         if(controller->get_speed()==0)
 293         {
 294                 release_blocks(cur_blocks_end, blocks.end());
 295                 return;
 296         }
 297
 298         float margin = 10*layout.get_catalogue().get_scale();
 299         float min_dist = controller->get_braking_distance()*1.3+margin;
 300
 301         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 302
 303         TrackIter track(veh.get_track(), veh.get_entry());
 304         BlockList::iterator block = blocks.begin();
 305         bool in_rsv = false;
 306         while(block!=blocks.end() && !(*block)->has_track(*track))
 307         {
 308                 ++block;
 309                 if(block==cur_blocks_end)
 310                         in_rsv = true;
 311         }
 312
 313         float dist = veh.get_offset();
 314         if(reverse)
 315                 track.reverse();
 316         else
 317                 dist = track->get_type().get_path_length(track->get_active_path())-dist;
 318         dist -= veh.get_type().get_length()/2;
 319
 320         bool nsens = 0;
 321         while(1)
 322         {
 323                 track = track.next();
 324
 325                 if(!(*block)->has_track(*track))
 326                 {
 327                         ++block;
 328                         if(block==cur_blocks_end)
 329                                 in_rsv = true;
 330                         if(block==blocks.end())
 331                                 return;
 332
 333                         if(dist>min_dist && nsens>0)
 334                         {
 335                                 release_blocks(block, blocks.end());
 336                                 return;
 337                         }
 338
 339                         if(in_rsv && (*block)->get_sensor_id())
 340                                 ++nsens;
 341                 }
 342
 343                 dist += track->get_type().get_path_length(track->get_active_path());
 344         }
 345 }
 346
 347 const BlockIter &Train::get_head_block() const
 348 {
 349         if(blocks.empty())
 350                 throw logic_error("no blocks");
 351         return blocks.back();
 352 }
 353
 354 const BlockIter &Train::get_tail_block() const
 355 {
 356         if(blocks.empty())
 357                 throw logic_error("no blocks");
 358         return blocks.front();
 359 }
 360
 361 int Train::get_entry_to_block(const Block &block) const
 362 {
 363         for(BlockList::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 364                 if(i->block()==&block)
 365                         return i->entry();
 366         return -1;
 367 }
 368
 369 float Train::get_reserved_distance() const
 370 {
 371         if(blocks.empty())
 372                 return 0;
 373
 374         float margin = 0;
 375         TrackIter next = blocks.back().next().track_iter();
 376         if(next && next->get_type().is_turnout())
 377                 margin = 15*layout.get_catalogue().get_scale();
 378
 379         return max(get_reserved_distance_until(pending_block, false)-margin, 0.0f);
 380 }
 381
 382 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 383 {
 384         if(!active && stop_timeout && t>=stop_timeout)
 385         {
 386                 release_blocks(cur_blocks_end, blocks.end());
 387                 stop_timeout = Time::TimeStamp();
 388         }
 389
 390         Driver &driver = layout.get_driver();
 391
 392         for(list<TrainAI *>::iterator i=ais.begin(); i!=ais.end(); ++i)
 393                 (*i)->tick(t, dt);
 394         controller->tick(dt);
 395         float speed = controller->get_speed();
 396         bool moving = speed>0;
 397
 398         if(controller->get_reverse()!=reverse)
 399         {
 400                 reverse = controller->get_reverse();
 401                 bool r = reverse;
 402                 if(loco_type.get_swap_direction())
 403                         r = !r;
 404                 driver.set_loco_reverse(address, r);
 405
 406                 release_blocks(cur_blocks_end, blocks.end());
 407                 reverse_blocks(blocks);
 408
 409                 reserve_more();
 410         }
 411
 412         if(speed_quantizer)
 413         {
 414                 unsigned speed_step = speed_quantizer->find_speed_step(speed);
 415                 if(speed_step!=current_speed_step && !speed_changing && !driver.is_halted() && driver.get_power())
 416                 {
 417                         speed_changing = true;
 418                         driver.set_loco_speed(address, speed_step);
 419
 420                         pure_speed = false;
 421                 }
 422
 423                 speed = speed_quantizer->get_speed(current_speed_step);
 424         }
 425
 426         if(moving)
 427         {
 428                 if(!active)
 429                         set_active(true);
 430
 431                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 432                 Track *track = vehicle.get_track();
 433
 434                 bool ok = false;
 435                 for(BlockList::const_iterator i=blocks.begin(); (!ok && i!=cur_blocks_end); ++i)
 436                         ok = (*i)->has_track(*track);
 437
 438                 float d = speed*(dt/Time::sec);
 439                 if(ok)
 440                 {
 441                         SetFlag setf(advancing);
 442                         vehicle.advance(reverse ? -d : d);
 443                 }
 444                 else if(accurate_position)
 445                 {
 446                         overshoot_dist += d;
 447                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 448                         {
 449                                 layout.emergency(name+" has not arrived at sensor");
 450                                 accurate_position = false;
 451                         }
 452                 }
 453         }
 454
 455         if(!blocks.empty() && !blocks.front()->get_sensor_id())
 456         {
 457                 float dist = get_reserved_distance_until(&*blocks.front(), true);
 458
 459                 if(dist>10*layout.get_catalogue().get_scale())
 460                 {
 461                         Block &block = *blocks.front();
 462                         blocks.pop_front();
 463                         block.reserve(0);
 464                 }
 465         }
 466 }
 467
 468 void Train::save(list<DataFile::Statement> &st) const
 469 {
 470         st.push_back((DataFile::Statement("name"), name));
 471
 472         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 473                 if(i!=vehicles.begin())
 474                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 475
 476         if(speed_quantizer)
 477         {
 478                 DataFile::Statement ss("quantized_speed");
 479                 speed_quantizer->save(ss.sub);
 480                 st.push_back(ss);
 481         }
 482
 483         if(!blocks.empty() && cur_blocks_end!=blocks.begin())
 484         {
 485                 BlockList blks(blocks.begin(), BlockList::const_iterator(cur_blocks_end));
 486                 if(reverse)
 487                         reverse_blocks(blks);
 488
 489                 BlockIter prev = blks.front().flip();
 490                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 491
 492                 for(BlockList::const_iterator i=blks.begin(); i!=blks.end(); ++i)
 493                         st.push_back((DataFile::Statement("block"), (*i)->get_id()));
 494         }
 495
 496         // XXX Need more generic way of saving AI state
 497         for(list<TrainAI *>::const_iterator i=ais.begin(); i!=ais.end(); ++i)
 498         {
 499                 if(TrainRouter *router = dynamic_cast<TrainRouter *>(*i))
 500                 {
 501                         DataFile::Statement ss("router");
 502                         router->save(ss.sub);
 503                         st.push_back(ss);
 504                 }
 505                 else if(Timetable *timetable = dynamic_cast<Timetable *>(*i))
 506                 {
 507                         DataFile::Statement ss("timetable");
 508                         timetable->save(ss.sub);
 509                         st.push_back(ss);
 510                 }
 511         }
 512 }
 513
 514 void Train::control_changed(const Controller::Control &ctrl)
 515 {
 516         signal_control_changed.emit(ctrl.name, ctrl.value);
 517 }
 518
 519 void Train::loco_speed_event(unsigned addr, unsigned speed, bool rev)
 520 {
 521         if(addr==address)
 522         {
 523                 current_speed_step = speed;
 524                 bool r = reverse;
 525                 if(loco_type.get_swap_direction())
 526                         r = !r;
 527                 if(rev!=r)
 528                         layout.get_driver().set_loco_reverse(address, r);
 529                 speed_changing = false;
 530                 pure_speed = false;
 531         }
 532 }
 533
 534 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 535 {
 536         if(addr==address)
 537         {
 538                 if(state)
 539                         functions |= 1<<func;
 540                 else
 541                         functions &= ~(1<<func);
 542
 543                 signal_function_changed.emit(func, state);
 544         }
 545 }
 546
 547 void Train::block_state_changed(Block &block, Block::State state)
 548 {
 549         if(state==Block::MAYBE_ACTIVE)
 550         {
 551                 // Find the first sensor block from our reserved blocks that isn't this sensor
 552                 BlockList::iterator end;
 553                 unsigned result = 0;
 554                 for(end=cur_blocks_end; end!=blocks.end(); ++end)
 555                         if((*end)->get_sensor_id())
 556                         {
 557                                 if(&**end!=&block)
 558                                 {
 559                                         if(result==0)
 560                                                 result = 2;
 561                                         else if(result==1)
 562                                                 break;
 563                                 }
 564                                 else if(result==0)
 565                                         result = 1;
 566                                 else if(result==2)
 567                                         result = 3;
 568                         }
 569
 570                 if(result==1)
 571                 {
 572                         // Compute speed and update related state
 573                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 574
 575                         if(pure_speed && speed_quantizer && current_speed_step>0 && travel_time_secs>=2)
 576                                 speed_quantizer->learn(current_speed_step, travel_dist/travel_time_secs, travel_time_secs);
 577
 578                         travel_dist = 0;
 579                         for(BlockList::iterator j=cur_blocks_end; j!=end; ++j)
 580                         {
 581                                 travel_dist += (*j)->get_path_length(j->entry());
 582
 583                                 if(&**j==&block && !advancing)
 584                                 {
 585                                         TrackIter track = j->track_iter();
 586                                         if(reverse)
 587                                         {
 588                                                 track = track.flip();
 589                                                 vehicles.back()->place(*track, track.entry(), 0, Vehicle::BACK_AXLE);
 590                                         }
 591                                         else
 592                                                 vehicles.front()->place(*track, track.entry(), 0, Vehicle::FRONT_AXLE);
 593                                 }
 594                         }
 595                         last_entry_time = Time::now();
 596                         pure_speed = true;
 597                         accurate_position = true;
 598                         overshoot_dist = 0;
 599
 600                         // Move blocks up to the next sensor to our current blocks
 601                         for(BlockList::iterator j=cur_blocks_end; j!=end; ++j)
 602                                 signal_advanced.emit(**j);
 603                         cur_blocks_end = end;
 604
 605                         // Try to get more blocks if we're moving
 606                         if(active)
 607                                 reserve_more();
 608                 }
 609                 else if(result==3)
 610                         layout.emergency("Sensor for "+name+" triggered out of order");
 611         }
 612         else if(state==Block::INACTIVE)
 613         {
 614                 const Vehicle &veh = *(reverse ? vehicles.front() : vehicles.back());
 615
 616                 // Find the first sensor in our current blocks that's still active
 617                 BlockList::iterator end = blocks.begin();
 618                 for(BlockList::iterator i=blocks.begin(); i!=cur_blocks_end; ++i)
 619                 {
 620                         if((*i)->has_track(*veh.get_track()))
 621                                 break;
 622                         if((*i)->get_sensor_id())
 623                         {
 624                                 if(layout.get_driver().get_sensor((*i)->get_sensor_id()))
 625                                         break;
 626                                 else
 627                                 {
 628                                         end = i;
 629                                         ++end;
 630                                 }
 631                         }
 632                 }
 633
 634                 if(end!=blocks.begin() && end!=cur_blocks_end)
 635                         // Free blocks up to the last inactive sensor
 636                         release_blocks(blocks.begin(), end);
 637         }
 638 }
 639
 640 void Train::turnout_path_changed(Track &track)
 641 {
 642         for(list<BlockIter>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 643                 if((*i)->get_turnout_id()==track.get_turnout_id() && !reserving && &**i==pending_block)
 644                         reserve_more();
 645 }
 646
 647 void Train::halt_event(bool h)
 648 {
 649         if(h)
 650                 accurate_position = false;
 651 }
 652
 653 void Train::block_reserved(const Block &block, const Train *train)
 654 {
 655         if(&block==pending_block && !train && !reserving)
 656                 reserve_more();
 657 }
 658
 659 void Train::reserve_more()
 660 {
 661         if(!active || blocks.empty())
 662                 return;
 663
 664         BlockIter start = blocks.back();
 665         if(&*start==stop_at_block)
 666                 return;
 667         else if(&*start==pending_block)
 668         {
 669                 TrackIter track = start.track_iter();
 670                 if(!track.endpoint().has_path(track->get_active_path()))
 671                         return;
 672         }
 673
 674         pending_block = 0;
 675         preceding_train = 0;
 676
 677         // See how many sensor blocks and how much track we already have
 678         unsigned nsens = 0;
 679         float dist = 0;
 680         for(BlockList::const_iterator i=cur_blocks_end; i!=blocks.end(); ++i)
 681         {
 682                 if((*i)->get_sensor_id())
 683                         ++nsens;
 684                 if(nsens>0)
 685                         dist += (*i)->get_path_length(i->entry());
 686         }
 687
 688         float approach_margin = 50*layout.get_catalogue().get_scale();
 689         float min_dist = controller->get_braking_distance()*1.3+approach_margin*2;
 690
 691         BlockIter block = start;
 692
 693         SetFlag setf(reserving);
 694
 695         while(1)
 696         {
 697                 BlockIter last = block;
 698                 block = block.next();
 699                 if(!block || block->get_endpoints().size()<2)
 700                         // The track ends here
 701                         break;
 702
 703                 if(block->get_turnout_id() && !last->get_turnout_id())
 704                 {
 705                         /* We are arriving at a turnout.  See if we have enough blocks and
 706                         distance reserved. */
 707                         if(nsens>=3 && dist>=min_dist)
 708                                 break;
 709                 }
 710
 711                 blocks.push_back(block);
 712                 if(!block->reserve(this))
 713                 {
 714                         blocks.pop_back();
 715                         pending_block = &*block;
 716                         break;
 717                 }
 718
 719                 if(cur_blocks_end==blocks.end())
 720                         --cur_blocks_end;
 721
 722                 TrackIter track = block.track_iter();
 723                 if(track->is_path_changing())
 724                 {
 725                         pending_block = &*block;
 726                         break;
 727                 }
 728                 else
 729                 {
 730                         const TrackType::Endpoint &entry_ep = track.endpoint();
 731                         unsigned path = track->get_active_path();
 732                         if(!entry_ep.has_path(path))
 733                         {
 734                                 const TrackType::Endpoint &exit_ep = track.reverse().endpoint();
 735                                 if(entry_ep.has_common_paths(exit_ep))
 736                                 {
 737                                         unsigned mask = entry_ep.paths&exit_ep.paths;
 738                                         for(path=0; mask>1; ++path, mask>>=1) ;
 739
 740                                         track->set_active_path(path);
 741                                         if(track->is_path_changing())
 742                                         {
 743                                                 pending_block = &*block;
 744                                                 break;
 745                                         }
 746                                 }
 747                                 else
 748                                         // XXX Do something here
 749                                         break;
 750                         }
 751                 }
 752
 753                 if(&*block==stop_at_block)
 754                         break;
 755
 756                 if(block->get_sensor_id())
 757                         ++nsens;
 758                 if(nsens>0)
 759                         dist += block->get_path_length(block.entry());
 760         }
 761
 762         // Make any sensorless blocks at the beginning immediately current
 763         while(cur_blocks_end!=blocks.end() && !(*cur_blocks_end)->get_sensor_id())
 764                 ++cur_blocks_end;
 765 }
 766
 767 float Train::get_reserved_distance_until(const Block *until_block, bool back) const
 768 {
 769         if(blocks.empty())
 770                 return 0;
 771
 772         Vehicle &veh = *(reverse!=back ? vehicles.back() : vehicles.front());
 773         const VehicleType &vtype = veh.get_type();
 774
 775         TrackIter track(veh.get_track(), veh.get_entry());
 776         if(!track)  // XXX Probably unnecessary
 777                 return 0;
 778
 779         BlockList::const_iterator block = blocks.begin();
 780         while(block!=blocks.end() && !(*block)->has_track(*track))
 781                 ++block;
 782         if(block==blocks.end() || &**block==until_block)
 783                 return 0;
 784
 785         float result = veh.get_offset();
 786         if(reverse!=back)
 787                 track = track.reverse();
 788         else
 789                 result = track->get_type().get_path_length(track->get_active_path())-result;
 790         result -= vtype.get_length()/2;
 791
 792         while(1)
 793         {
 794                 track = track.next();
 795                 if(!track)
 796                         break;
 797
 798                 if(!(*block)->has_track(*track))
 799                 {
 800                         if(back)
 801                         {
 802                                 if(block==blocks.begin())
 803                                         break;
 804                                 --block;
 805                         }
 806                         else
 807                         {
 808                                 ++block;
 809                                 if(block==blocks.end())
 810                                         break;
 811                         }
 812
 813                         if(&**block==until_block)
 814                                 break;
 815                 }
 816
 817                 result += track->get_type().get_path_length(track->get_active_path());
 818         }
 819
 820         return result;
 821 }
 822
 823 void Train::release_blocks()
 824 {
 825         release_blocks(blocks.begin(), blocks.end());
 826 }
 827
 828 void Train::release_blocks(BlockList::iterator begin, BlockList::iterator end)
 829 {
 830         while(begin!=end)
 831         {
 832                 if(begin==cur_blocks_end)
 833                         cur_blocks_end = end;
 834
 835                 Block &block = **begin;
 836                 blocks.erase(begin++);
 837                 block.reserve(0);
 838         }
 839 }
 840
 841 void Train::reverse_blocks(BlockList &blks) const
 842 {
 843         blks.reverse();
 844         for(BlockList::iterator i=blks.begin(); i!=blks.end(); ++i)
 845                 *i = i->reverse();
 846 }
 847
 848
 849 Train::Loader::Loader(Train &t):
 850         DataFile::ObjectLoader<Train>(t),
 851         prev_block(0),
 852         blocks_valid(true)
 853 {
 854         add("block",       &Loader::block);
 855         add("block_hint",  &Loader::block_hint);
 856         add("name",        &Loader::name);
 857         add("quantized_speed",  &Loader::quantized_speed);
 858         add("router",      &Loader::router);
 859         add("timetable",   &Loader::timetable);
 860         add("vehicle",     &Loader::vehicle);
 861 }
 862
 863 void Train::Loader::finish()
 864 {
 865         if(!obj.blocks.empty())
 866         {
 867                 TrackIter track = obj.blocks.front().track_iter();
 868                 float offset = 2*obj.layout.get_catalogue().get_scale();
 869                 obj.vehicles.back()->place(*track, track.entry(), offset, Vehicle::BACK_BUFFER);
 870         }
 871 }
 872
 873 void Train::Loader::block(unsigned id)
 874 {
 875         if(!blocks_valid)
 876                 return;
 877
 878         Block *blk;
 879         try
 880         {
 881                 blk = &obj.layout.get_block(id);
 882         }
 883         catch(const key_error &)
 884         {
 885                 blocks_valid = false;
 886                 return;
 887         }
 888
 889         int entry = -1;
 890         if(prev_block)
 891                 entry = blk->get_endpoint_by_link(*prev_block);
 892         if(entry<0)
 893                 entry = 0;
 894
 895         obj.blocks.push_back(BlockIter(blk, entry));
 896         blk->reserve(&obj);
 897
 898         if(blk->get_sensor_id())
 899                 obj.layout.get_driver().set_sensor(blk->get_sensor_id(), true);
 900
 901         prev_block = blk;
 902 }
 903
 904 void Train::Loader::block_hint(unsigned id)
 905 {
 906         try
 907         {
 908                 prev_block = &obj.layout.get_block(id);
 909         }
 910         catch(const key_error &)
 911         {
 912                 blocks_valid = false;
 913         }
 914 }
 915
 916 void Train::Loader::name(const string &n)
 917 {
 918         obj.set_name(n);
 919 }
 920
 921 void Train::Loader::quantized_speed()
 922 {
 923         if(obj.speed_quantizer)
 924                 load_sub(*obj.speed_quantizer);
 925 }
 926
 927 void Train::Loader::router()
 928 {
 929         TrainRouter *rtr = new TrainRouter(obj);
 930         load_sub(*rtr);
 931 }
 932
 933 void Train::Loader::timetable()
 934 {
 935         Timetable *ttbl = new Timetable(obj);
 936         load_sub(*ttbl);
 937 }
 938
 939 void Train::Loader::vehicle(ArticleNumber art_nr)
 940 {
 941         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(art_nr);
 942         Vehicle *veh = new Vehicle(obj.layout, vtype);
 943         obj.vehicles.back()->attach_back(*veh);
 944         obj.vehicles.push_back(veh);
 945 }
 946
 947 } // namespace R2C2