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 "tracktype.h"
  20 #include "train.h"
  21 #include "vehicle.h"
  22
  23 using namespace std;
  24 using namespace Msp;
  25
  26 namespace Marklin {
  27
  28 Train::Train(Layout &l, const LocoType &t, unsigned a):
  29         layout(l),
  30         loco_type(t),
  31         address(a),
  32         pending_block(0),
  33         control(new AIControl(*this, new SimplePhysics)),
  34         active(false),
  35         current_speed(0),
  36         speed_changing(false),
  37         reverse(false),
  38         functions(0),
  39         route(0),
  40         next_route(0),
  41         end_of_route(false),
  42         status("Unplaced"),
  43         travel_dist(0),
  44         pure_speed(false),
  45         real_speed(15)
  46 {
  47         vehicles.push_back(new Vehicle(layout, loco_type));
  48
  49         layout.add_train(*this);
  50
  51         layout.get_driver().add_loco(address);
  52         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  53         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  54
  55         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  56         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  57         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  58 }
  59
  60 Train::~Train()
  61 {
  62         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  63                 delete *i;
  64         layout.remove_train(*this);
  65 }
  66
  67 void Train::set_name(const string &n)
  68 {
  69         name = n;
  70
  71         signal_name_changed.emit(name);
  72 }
  73
  74 Vehicle &Train::get_vehicle(unsigned i)
  75 {
  76         if(i>=vehicles.size())
  77                 throw InvalidParameterValue("Vehicle index out of range");
  78         return *vehicles[i];
  79 }
  80
  81 const Vehicle &Train::get_vehicle(unsigned i) const
  82 {
  83         if(i>=vehicles.size())
  84                 throw InvalidParameterValue("Vehicle index out of range");
  85         return *vehicles[i];
  86 }
  87
  88 void Train::set_control(const string &n, float v)
  89 {
  90         control->set_control(n, v);
  91         signal_control_changed.emit(n, control->get_control(n).value);
  92 }
  93
  94 void Train::set_active(bool a)
  95 {
  96         if(a==active)
  97                 return;
  98         if(!a && control->get_speed())
  99                 throw InvalidState("Can't deactivate while moving");
 100
 101         active = a;
 102         if(active)
 103         {
 104                 stop_timeout = Time::TimeStamp();
 105                 reserve_more();
 106         }
 107         else
 108         {
 109                 stop_timeout = Time::now()+2*Time::sec;
 110                 set_status("Stopped");
 111         }
 112 }
 113
 114 void Train::set_function(unsigned func, bool state)
 115 {
 116         if(!loco_type.get_functions().count(func))
 117                 throw InvalidParameterValue("Invalid function");
 118         if(func<5)
 119                 layout.get_driver().set_loco_function(address, func, state);
 120         else
 121                 layout.get_driver().set_loco_function(address+1, func-4, state);
 122 }
 123
 124 bool Train::get_function(unsigned func) const
 125 {
 126         return (functions>>func)&1;
 127 }
 128
 129 void Train::set_route(const Route *r)
 130 {
 131         if(!rsv_blocks.empty())
 132         {
 133                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 134                         if(i->block->get_sensor_id())
 135                         {
 136                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 137                                 break;
 138                         }
 139         }
 140
 141         route = r;
 142         next_route = 0;
 143         end_of_route = false;
 144
 145         if(route)
 146         {
 147                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 148                 BlockRef next = last.next();
 149                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 150                 if(!route->get_tracks().count(ep.track))
 151                 {
 152                         next_route = route;
 153                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 154                 }
 155         }
 156
 157         if(active)
 158                 reserve_more();
 159
 160         signal_route_changed.emit(route);
 161 }
 162
 163 void Train::go_to(const Track &to)
 164 {
 165         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 166                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 167                 {
 168                         signal_arrived.emit();
 169                         set_route(0);
 170                         return;
 171                 }
 172
 173         BlockRef *last = 0;
 174         if(rsv_blocks.empty())
 175                 last = &cur_blocks.back();
 176         else
 177         {
 178                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 179                         if(i->block->get_sensor_id())
 180                                 last = &*i;
 181         }
 182
 183         BlockRef next = last->next();
 184         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 185
 186         set_route(Route::find(*ep.track, ep.track_ep, to));
 187 }
 188
 189 void Train::place(Block &block, unsigned entry)
 190 {
 191         if(control->get_speed())
 192                 throw InvalidState("Must be stopped before placing");
 193
 194         release_blocks(rsv_blocks);
 195         release_blocks(cur_blocks);
 196
 197         set_active(false);
 198
 199         if(!block.reserve(this))
 200         {
 201                 set_status("Unplaced");
 202                 return;
 203         }
 204
 205         cur_blocks.push_back(BlockRef(&block, entry));
 206         if(reverse)
 207         {
 208                 unsigned exit = block.traverse(entry);
 209                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 210                 Track *track = bep.track->get_link(bep.track_ep);
 211                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 212                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 213         }
 214         else
 215         {
 216                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 217                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 218         }
 219 }
 220
 221 bool Train::free_block(Block &block)
 222 {
 223         unsigned nsens = 0;
 224         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 225         {
 226                 if(i->block==&block)
 227                 {
 228                         if(nsens<1)
 229                                 return false;
 230                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 231                         return true;
 232                 }
 233                 else if(i->block->get_sensor_id())
 234                         ++nsens;
 235         }
 236
 237         return false;
 238 }
 239
 240 int Train::get_entry_to_block(Block &block) const
 241 {
 242         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 243                 if(i->block==&block)
 244                         return i->entry;
 245         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 246                 if(i->block==&block)
 247                         return i->entry;
 248         return -1;
 249 }
 250
 251 float Train::get_reserved_distance() const
 252 {
 253         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 254         const VehicleType &vtype = veh.get_type();
 255
 256         Track *track = veh.get_track();
 257         unsigned entry = veh.get_entry();
 258
 259         float result = -vtype.get_length()/2;
 260         if(reverse)
 261         {
 262                 entry = track->traverse(entry);
 263                 result += veh.get_offset();
 264         }
 265         else
 266                 result -= veh.get_offset();
 267
 268         bool first = true;
 269         list<BlockRef>::const_iterator block = cur_blocks.begin();
 270         while(1)
 271         {
 272                 if(!first || !reverse)
 273                         result += track->get_type().get_path_length(track->get_active_path());
 274                 first = false;
 275
 276                 unsigned exit = track->traverse(entry);
 277                 Track *next = track->get_link(exit);
 278
 279                 while(!block->block->get_tracks().count(next))
 280                 {
 281                         ++block;
 282                         if(block==cur_blocks.end())
 283                                 block = rsv_blocks.begin();
 284                         if(block==rsv_blocks.end())
 285                                 return result;
 286                 }
 287
 288                 entry = next->get_endpoint_by_link(*track);
 289                 track = next;
 290         }
 291 }
 292
 293 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 294 {
 295         if(!active && stop_timeout && t>=stop_timeout)
 296         {
 297                 release_blocks(rsv_blocks);
 298                 end_of_route = false;
 299                 stop_timeout = Time::TimeStamp();
 300         }
 301
 302         control->tick(dt);
 303         float speed = control->get_speed();
 304         unsigned speed_notch = find_speed(abs(speed));
 305
 306         if(speed && (speed<0)!=reverse)
 307         {
 308                 layout.get_driver().set_loco_reverse(address, speed<0);
 309                 reverse = speed<0;
 310
 311                 release_blocks(rsv_blocks);
 312                 reverse_blocks(cur_blocks);
 313
 314                 reserve_more();
 315         }
 316         if(speed_notch!=current_speed && !speed_changing)
 317         {
 318                 speed_changing = true;
 319                 layout.get_driver().set_loco_speed(address, speed_notch);
 320
 321                 pure_speed = false;
 322
 323                 if(speed_notch)
 324                         set_status(format("Traveling %d kmh", get_travel_speed()));
 325                 else
 326                         set_status("Waiting");
 327         }
 328
 329         if(speed)
 330         {
 331                 if(!active)
 332                         set_active(true);
 333
 334                 Track *track = vehicles[0]->get_track();
 335
 336                 bool ok = false;
 337                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 338                         ok = i->block->get_tracks().count(track);
 339
 340                 if(ok)
 341                 {
 342                         float d = get_real_speed(current_speed)*(dt/Time::sec);
 343                         vehicles[0]->advance(reverse ? -d : d);
 344                 }
 345         }
 346         else if(end_of_route)
 347                 set_route(0);
 348 }
 349
 350 void Train::save(list<DataFile::Statement> &st) const
 351 {
 352         st.push_back((DataFile::Statement("name"), name));
 353         for(unsigned i=0; i<=14; ++i)
 354                 if(real_speed[i].weight)
 355                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 356
 357         if(!cur_blocks.empty())
 358         {
 359                 list<BlockRef> blocks = cur_blocks;
 360                 if(reverse)
 361                         reverse_blocks(blocks);
 362
 363                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 364                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 365
 366                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 367                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 368         }
 369
 370         if(route)
 371                 st.push_back((DataFile::Statement("route"), route->get_name()));
 372 }
 373
 374 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 375 {
 376         if(addr==address)
 377         {
 378                 current_speed = speed;
 379                 speed_changing = false;
 380         }
 381 }
 382
 383 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 384 {
 385         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 386         {
 387                 if(addr==address+1)
 388                         func += 4;
 389                 if(state)
 390                         functions |= 1<<func;
 391                 else
 392                         functions &= ~(1<<func);
 393
 394                 signal_function_changed.emit(func, state);
 395         }
 396 }
 397
 398 void Train::sensor_event(unsigned addr, bool state)
 399 {
 400         if(state)
 401         {
 402                 // Find the first sensor block from our reserved blocks that isn't this sensor
 403                 list<BlockRef>::iterator i;
 404                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 405                         if(i->block->get_sensor_id() && i->block->get_sensor_id()!=addr)
 406                                 break;
 407
 408                 if(i!=rsv_blocks.begin())
 409                 {
 410                         // Compute speed and update related state
 411                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 412
 413                         if(pure_speed)
 414                         {
 415                                 RealSpeed &rs = real_speed[current_speed];
 416                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 417                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 418                         }
 419
 420                         travel_dist = 0;
 421                         float block_len;
 422                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 423                         {
 424                                 j->block->traverse(j->entry, &block_len);
 425                                 travel_dist += block_len;
 426
 427                                 if(j->block->get_sensor_id()==addr)
 428                                 {
 429                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 430                                         if(reverse)
 431                                         {
 432                                                 Track *track = bep.track->get_link(bep.track_ep);
 433                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 434                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 435                                         }
 436                                         else
 437                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 438                                 }
 439                         }
 440                         last_entry_time = Time::now();
 441                         pure_speed = true;
 442
 443                         // Check if we've reached the next route
 444                         if(next_route)
 445                         {
 446                                 const set<const Track *> &rtracks = next_route->get_tracks();
 447                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 448                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 449                                         {
 450                                                 route = next_route;
 451                                                 next_route = 0;
 452                                                 // XXX Exceptions?
 453                                                 signal_route_changed.emit(route);
 454                                                 break;
 455                                         }
 456                         }
 457
 458                         // Move blocks up to the next sensor to our current blocks
 459                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 460
 461                         // Try to get more blocks if we're moving
 462                         if(active)
 463                         {
 464                                 unsigned nsens = reserve_more();
 465                                 if(!nsens && end_of_route)
 466                                         signal_arrived.emit();
 467                         }
 468                 }
 469         }
 470         else
 471         {
 472                 // Find the first sensor in our current blocks that's still active
 473                 list<BlockRef>::iterator end = cur_blocks.begin();
 474                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 475                         if(i->block->get_sensor_id())
 476                         {
 477                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 478                                         break;
 479                                 else
 480                                         end = i;
 481                         }
 482
 483                 if(end!=cur_blocks.begin())
 484                 {
 485                         // Free blocks up to the last inactive sensor
 486                         ++end;
 487                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 488                 }
 489         }
 490 }
 491
 492 void Train::turnout_event(unsigned addr, bool)
 493 {
 494         if(pending_block)
 495         {
 496                 unsigned pending_addr = pending_block->get_turnout_id();
 497                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 498                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 499                         reserve_more();
 500         }
 501 }
 502
 503 void Train::block_reserved(const Block &block, const Train *train)
 504 {
 505         if(&block==pending_block && !train)
 506                 reserve_more();
 507 }
 508
 509 unsigned Train::reserve_more()
 510 {
 511         BlockRef *last = 0;
 512         if(!rsv_blocks.empty())
 513                 last = &rsv_blocks.back();
 514         else if(!cur_blocks.empty())
 515                 last = &cur_blocks.back();
 516         if(!last)
 517                 return 0;
 518
 519         pending_block = 0;
 520
 521         // See how many sensor blocks we already have
 522         unsigned nsens = 0;
 523         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 524                 if(i->block->get_sensor_id())
 525                         ++nsens;
 526
 527         if(end_of_route)
 528                 return nsens;
 529
 530         const Route *cur_route = 0;
 531         if(route)
 532         {
 533                 const set<Track *> &tracks = last->block->get_tracks();
 534                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 535                 {
 536                         if(route->get_tracks().count(*i))
 537                                 cur_route = route;
 538                         else if(next_route && next_route->get_tracks().count(*i))
 539                                 cur_route = next_route;
 540                 }
 541         }
 542
 543         bool got_more = false;
 544         BlockRef *good = last;
 545         unsigned good_sens = nsens;
 546         while(good_sens<3)
 547         {
 548                 // Traverse to the next block
 549                 unsigned exit = last->block->traverse(last->entry);
 550                 Block *link = last->block->get_link(exit);
 551                 if(!link)
 552                         break;
 553
 554                 int entry = link->get_endpoint_by_link(*last->block);
 555                 if(entry<0)
 556                         throw LogicError("Block links are inconsistent!");
 557
 558                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 559
 560                 if(cur_route)
 561                 {
 562                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 563                                 cur_route = next_route;
 564                         else if(!cur_route->get_tracks().count(entry_ep.track))
 565                         {
 566                                 // Keep the blocks if we arrived at the end of the route
 567                                 good = last;
 568                                 good_sens = nsens;
 569                                 end_of_route = true;
 570                                 break;
 571                         }
 572                 }
 573                 else if(route && route->get_tracks().count(entry_ep.track))
 574                         cur_route = route;
 575
 576                 if(!link->reserve(this))
 577                 {
 578                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 579                         int other_entry = link->get_train()->get_entry_to_block(*link);
 580                         if(other_entry<0)
 581                                 throw LogicError("Block reservation inconsistency");
 582                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 583                         {
 584                                 good = last;
 585                                 good_sens = nsens;
 586                         }
 587                         pending_block = link;
 588                         break;
 589                 }
 590
 591                 if(link->get_turnout_id())
 592                 {
 593                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 594
 595                         // Keep the blocks reserved so far, as either us or the other train can diverge
 596                         good = last;
 597                         good_sens = nsens;
 598
 599                         // Figure out what path we'd like to take on the turnout
 600                         int path = -1;
 601                         if(cur_route)
 602                                 path = cur_route->get_turnout(link->get_turnout_id());
 603                         if(path<0)
 604                                 path = entry_ep.track->get_active_path();
 605                         if(!((track_ep.paths>>path)&1))
 606                         {
 607                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 608                                         if((track_ep.paths>>i)&1)
 609                                                 path = i;
 610                         }
 611
 612                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 613                         {
 614                                 // The turnout is set to wrong path - switch and wait for it
 615                                 link->reserve(0);
 616                                 pending_block = link;
 617                                 entry_ep.track->set_active_path(path);
 618                                 break;
 619                         }
 620                 }
 621
 622                 rsv_blocks.push_back(BlockRef(link, entry));
 623                 last = &rsv_blocks.back();
 624                 if(last->block->get_sensor_id())
 625                 {
 626                         ++nsens;
 627                         got_more = true;
 628                 }
 629         }
 630
 631         // Unreserve blocks that were not good
 632         while(!rsv_blocks.empty() && last!=good)
 633         {
 634                 last->block->reserve(0);
 635                 rsv_blocks.erase(--rsv_blocks.end());
 636                 if(!rsv_blocks.empty())
 637                         last = &rsv_blocks.back();
 638         }
 639
 640         return good_sens;
 641 }
 642
 643 float Train::get_real_speed(unsigned i) const
 644 {
 645         if(real_speed[i].weight)
 646                 return real_speed[i].speed;
 647
 648         unsigned low;
 649         unsigned high;
 650         for(low=i; low>0; --low)
 651                 if(real_speed[low].weight)
 652                         break;
 653         for(high=i; high<14; ++high)
 654                 if(real_speed[high].weight)
 655                         break;
 656
 657         if(real_speed[high].weight)
 658         {
 659                 if(real_speed[low].weight)
 660                 {
 661                         float f = float(i-low)/(high-low);
 662                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 663                 }
 664                 else
 665                         return real_speed[high].speed*float(i)/high;
 666         }
 667         else if(real_speed[low].weight)
 668                 return real_speed[low].speed*float(i)/low;
 669         else
 670                 return 0;
 671 }
 672
 673 unsigned Train::find_speed(float real) const
 674 {
 675         if(real<=real_speed[0].speed)
 676                 return 0;
 677
 678         unsigned low = 0;
 679         unsigned high = 0;
 680         for(unsigned i=0; (!high && i<=14); ++i)
 681                 if(real_speed[i].weight)
 682                 {
 683                         if(real_speed[i].speed<real)
 684                                 low = i;
 685                         else
 686                                 high = i;
 687                 }
 688         if(!high)
 689         {
 690                 if(!low)
 691                         return 0;
 692                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 693         }
 694
 695         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 696         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 697 }
 698
 699 float Train::get_travel_speed() const
 700 {
 701         float speed = get_real_speed(current_speed);
 702         float scale = layout.get_catalogue().get_scale();
 703         return static_cast<int>(round(speed/scale*3.6/5))*5;
 704 }
 705
 706 void Train::set_status(const string &s)
 707 {
 708         status = s;
 709         signal_status_changed.emit(s);
 710 }
 711
 712 void Train::release_blocks(list<BlockRef> &blocks)
 713 {
 714         release_blocks(blocks, blocks.begin(), blocks.end());
 715 }
 716
 717 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 718 {
 719         while(begin!=end)
 720         {
 721                 Block *block = begin->block;
 722                 blocks.erase(begin++);
 723                 block->reserve(0);
 724         }
 725 }
 726
 727 void Train::reverse_blocks(list<BlockRef> &blocks) const
 728 {
 729         blocks.reverse();
 730         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 731                 i->entry = i->block->traverse(i->entry);
 732 }
 733
 734
 735 Train::BlockRef::BlockRef(Block *b, unsigned e):
 736         block(b),
 737         entry(e)
 738 { }
 739
 740 Train::BlockRef Train::BlockRef::next() const
 741 {
 742         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 743         if(!blk)
 744                 throw InvalidState("At end of line");
 745
 746         int ep = blk->get_endpoint_by_link(*block);
 747         if(ep<0)
 748                 throw LogicError("Block links are inconsistent");
 749
 750         return BlockRef(blk, ep);
 751 }
 752
 753
 754 Train::RealSpeed::RealSpeed():
 755         speed(0),
 756         weight(0)
 757 { }
 758
 759 void Train::RealSpeed::add(float s, float w)
 760 {
 761         speed = (speed*weight+s*w)/(weight+w);
 762         weight = min(weight+w, 300.0f);
 763 }
 764
 765
 766 Train::Loader::Loader(Train &t):
 767         DataFile::BasicLoader<Train>(t),
 768         prev_block(0)
 769 {
 770         add("block",       &Loader::block);
 771         add("block_hint",  &Loader::block_hint);
 772         add("name",        &Loader::name);
 773         add("real_speed",  &Loader::real_speed);
 774         add("route",       &Loader::route);
 775 }
 776
 777 void Train::Loader::block(unsigned id)
 778 {
 779         Block &blk = obj.layout.get_block(id);
 780         int entry = -1;
 781         if(prev_block)
 782                 entry = blk.get_endpoint_by_link(*prev_block);
 783         if(entry<0)
 784                 entry = 0;
 785
 786         blk.reserve(&obj);
 787         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 788         obj.set_status("Stopped");
 789         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 790         obj.vehicles.back()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 791
 792         if(blk.get_sensor_id())
 793                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 794
 795         prev_block = &blk;
 796 }
 797
 798 void Train::Loader::block_hint(unsigned id)
 799 {
 800         prev_block = &obj.layout.get_block(id);
 801 }
 802
 803 void Train::Loader::name(const string &n)
 804 {
 805         obj.set_name(n);
 806 }
 807
 808 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 809 {
 810         obj.real_speed[i].speed = speed;
 811         obj.real_speed[i].weight = weight;
 812 }
 813
 814 void Train::Loader::route(const string &n)
 815 {
 816         obj.set_route(&obj.layout.get_route(n));
 817 }
 818
 819 } // namespace Marklin