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 "driver.h"
  13 #include "layout.h"
  14 #include "locotype.h"
  15 #include "route.h"
  16 #include "tracktype.h"
  17 #include "train.h"
  18
  19 using namespace std;
  20 using namespace Msp;
  21
  22 namespace Marklin {
  23
  24 Train::Train(Layout &l, const LocoType &t, unsigned a):
  25         layout(l),
  26         loco_type(t),
  27         address(a),
  28         pending_block(0),
  29         target_speed(0),
  30         current_speed(0),
  31         reverse(false),
  32         functions(0),
  33         route(0),
  34         next_route(0),
  35         end_of_route(false),
  36         status("Unplaced"),
  37         travel_dist(0),
  38         travel_speed(0),
  39         pure_speed(false),
  40         real_speed(15),
  41         cur_track(0)
  42 {
  43         layout.add_train(*this);
  44
  45         layout.get_driver().add_loco(address);
  46         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  47         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  48
  49         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  50         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  51         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  52 }
  53
  54 Train::~Train()
  55 {
  56         layout.remove_train(*this);
  57 }
  58
  59 void Train::set_name(const string &n)
  60 {
  61         name = n;
  62
  63         signal_name_changed.emit(name);
  64 }
  65
  66 void Train::set_speed(unsigned speed)
  67 {
  68         if(speed==target_speed)
  69                 return;
  70         travel_speed = static_cast<int>(round(get_real_speed(speed)*87*3.6/5))*5;
  71
  72         target_speed = speed;
  73         if(!target_speed)
  74         {
  75                 pending_block = 0;
  76                 stop_timeout = Time::now()+(800+current_speed*150)*Time::msec;
  77         }
  78         else
  79                 reserve_more();
  80
  81         signal_target_speed_changed.emit(target_speed);
  82
  83         update_speed();
  84         pure_speed = false;
  85 }
  86
  87 void Train::set_reverse(bool rev)
  88 {
  89         if(rev==reverse)
  90                 return;
  91
  92         if(target_speed)
  93         {
  94                 set_speed(0);
  95                 return;
  96         }
  97         else if(stop_timeout)
  98                 return;
  99
 100         layout.get_driver().set_loco_reverse(address, rev);
 101
 102         release_blocks(rsv_blocks);
 103         reverse_blocks(cur_blocks);
 104
 105         if(cur_track)
 106         {
 107                 unsigned path = cur_track->get_active_path();
 108                 cur_track_ep = cur_track->traverse(cur_track_ep, path);
 109                 offset = cur_track->get_type().get_path_length(path)-offset;
 110         }
 111 }
 112
 113 void Train::set_function(unsigned func, bool state)
 114 {
 115         if(!loco_type.get_functions().count(func))
 116                 throw InvalidParameterValue("Invalid function");
 117         if(func<5)
 118                 layout.get_driver().set_loco_function(address, func, state);
 119         else
 120                 layout.get_driver().set_loco_function(address+1, func-4, state);
 121 }
 122
 123 bool Train::get_function(unsigned func) const
 124 {
 125         return (functions>>func)&1;
 126 }
 127
 128 void Train::set_route(const Route *r)
 129 {
 130         if(!rsv_blocks.empty())
 131         {
 132                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 133                         if(i->block->get_sensor_id())
 134                         {
 135                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 136                                 break;
 137                         }
 138         }
 139
 140         route = r;
 141         next_route = 0;
 142         end_of_route = false;
 143
 144         if(route)
 145         {
 146                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 147                 BlockRef next = last.next();
 148                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 149                 if(!route->get_tracks().count(ep.track))
 150                 {
 151                         next_route = route;
 152                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 153                 }
 154         }
 155
 156         if(target_speed && reserve_more()<2)
 157                 update_speed();
 158
 159         signal_route_changed.emit(route);
 160 }
 161
 162 void Train::go_to(const Track &to)
 163 {
 164         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 165                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 166                 {
 167                         set_speed(0);
 168                         set_route(0);
 169                         return;
 170                 }
 171
 172         BlockRef *last = 0;
 173         if(rsv_blocks.empty())
 174                 last = &cur_blocks.back();
 175         else
 176         {
 177                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 178                         if(i->block->get_sensor_id())
 179                                 last = &*i;
 180         }
 181
 182         BlockRef next = last->next();
 183         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 184
 185         set_route(Route::find(*ep.track, ep.track_ep, to));
 186 }
 187
 188 void Train::place(Block &block, unsigned entry)
 189 {
 190         if(target_speed)
 191                 set_speed(0);
 192
 193         release_blocks(rsv_blocks);
 194         release_blocks(cur_blocks);
 195
 196         if(!block.reserve(this))
 197         {
 198                 set_status("Unplaced");
 199                 return;
 200         }
 201
 202         cur_blocks.push_back(BlockRef(&block, entry));
 203         set_position(block.get_endpoints()[entry]);
 204
 205         set_status("Stopped");
 206 }
 207
 208 bool Train::free_block(Block &block)
 209 {
 210         unsigned nsens = 0;
 211         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 212         {
 213                 if(i->block==&block)
 214                 {
 215                         if(nsens<1)
 216                                 return false;
 217                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 218                         update_speed();
 219                         return true;
 220                 }
 221                 else if(i->block->get_sensor_id())
 222                         ++nsens;
 223         }
 224
 225         return false;
 226 }
 227
 228 int Train::get_entry_to_block(Block &block) const
 229 {
 230         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 231                 if(i->block==&block)
 232                         return i->entry;
 233         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 234                 if(i->block==&block)
 235                         return i->entry;
 236         return -1;
 237 }
 238
 239 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 240 {
 241         if(stop_timeout && t>=stop_timeout)
 242         {
 243                 release_blocks(rsv_blocks);
 244                 end_of_route = false;
 245                 stop_timeout = Time::TimeStamp();
 246         }
 247
 248         if(cur_track)
 249         {
 250                 unsigned path = cur_track->get_active_path();
 251
 252                 offset += get_real_speed(current_speed)*(dt/Time::sec);
 253                 float path_len = cur_track->get_type().get_path_length(path);
 254                 if(offset>path_len)
 255                 {
 256                         unsigned out = cur_track->traverse(cur_track_ep, path);
 257                         Track *next = cur_track->get_link(out);
 258
 259                         bool ok = false;
 260                         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 261                                 ok = i->block->get_tracks().count(next);
 262
 263                         if(ok)
 264                         {
 265                                 if(next)
 266                                         cur_track_ep = next->get_endpoint_by_link(*cur_track);
 267                                 cur_track = next;
 268                                 offset = 0;
 269                         }
 270                         else
 271                                 offset = path_len-0.001;
 272                 }
 273
 274                 if(cur_track)
 275                         pos = cur_track->get_point(cur_track_ep, path, offset).pos;
 276         }
 277 }
 278
 279 void Train::save(list<DataFile::Statement> &st) const
 280 {
 281         st.push_back((DataFile::Statement("name"), name));
 282         for(unsigned i=0; i<=14; ++i)
 283                 if(real_speed[i].weight)
 284                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 285
 286         if(!cur_blocks.empty())
 287         {
 288                 list<BlockRef> blocks = cur_blocks;
 289                 if(reverse)
 290                         reverse_blocks(blocks);
 291
 292                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 293                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 294
 295                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 296                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 297         }
 298
 299         if(route)
 300                 st.push_back((DataFile::Statement("route"), route->get_name()));
 301 }
 302
 303 void Train::loco_speed_event(unsigned addr, unsigned speed, bool rev)
 304 {
 305         if(addr==address)
 306         {
 307                 current_speed = speed;
 308                 reverse = rev;
 309
 310                 signal_speed_changed.emit(current_speed);
 311                 signal_reverse_changed.emit(reverse);
 312         }
 313 }
 314
 315 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 316 {
 317         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 318         {
 319                 if(addr==address+1)
 320                         func += 4;
 321                 if(state)
 322                         functions |= 1<<func;
 323                 else
 324                         functions &= ~(1<<func);
 325
 326                 signal_function_changed.emit(func, state);
 327         }
 328 }
 329
 330 void Train::sensor_event(unsigned addr, bool state)
 331 {
 332         if(state)
 333         {
 334                 // Find the first sensor block from our reserved blocks that isn't this sensor
 335                 list<BlockRef>::iterator i;
 336                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 337                         if(i->block->get_sensor_id() && i->block->get_sensor_id()!=addr)
 338                                 break;
 339
 340                 if(i!=rsv_blocks.begin())
 341                 {
 342                         // Compute speed and update related state
 343                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 344                         travel_speed = static_cast<int>(round(travel_dist/travel_time_secs*87*3.6/5))*5;
 345
 346                         if(pure_speed)
 347                         {
 348                                 RealSpeed &rs = real_speed[current_speed];
 349                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 350                         }
 351
 352                         travel_dist = 0;
 353                         float block_len;
 354                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 355                         {
 356                                 j->block->traverse(j->entry, &block_len);
 357                                 travel_dist += block_len;
 358
 359                                 if(j->block->get_sensor_id()==addr)
 360                                         set_position(j->block->get_endpoints()[j->entry]);
 361                         }
 362                         last_entry_time = Time::now();
 363                         pure_speed = true;
 364
 365                         // Check if we've reached the next route
 366                         if(next_route)
 367                         {
 368                                 const set<const Track *> &rtracks = next_route->get_tracks();
 369                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 370                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 371                                         {
 372                                                 route = next_route;
 373                                                 next_route = 0;
 374                                                 // XXX Exceptions?
 375                                                 signal_route_changed.emit(route);
 376                                                 break;
 377                                         }
 378                         }
 379
 380                         // Move blocks up to the next sensor to our current blocks
 381                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 382
 383                         // Try to get more blocks if we're moving
 384                         if(target_speed)
 385                         {
 386                                 unsigned nsens = reserve_more();
 387                                 if(!nsens && end_of_route)
 388                                 {
 389                                         set_speed(0);
 390                                         set_route(0);
 391                                 }
 392                                 else if(nsens<2)
 393                                         update_speed();
 394                         }
 395                 }
 396         }
 397         else
 398         {
 399                 // Find the first sensor in our current blocks that's still active
 400                 list<BlockRef>::iterator end = cur_blocks.begin();
 401                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 402                         if(i->block->get_sensor_id())
 403                         {
 404                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 405                                         break;
 406                                 else
 407                                         end = i;
 408                         }
 409
 410                 if(end!=cur_blocks.begin())
 411                 {
 412                         // Free blocks up to the last inactive sensor
 413                         ++end;
 414                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 415                 }
 416         }
 417 }
 418
 419 void Train::turnout_event(unsigned addr, bool)
 420 {
 421         if(pending_block)
 422         {
 423                 unsigned pending_addr = pending_block->get_turnout_id();
 424                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 425                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 426                         reserve_more();
 427         }
 428 }
 429
 430 void Train::block_reserved(const Block &block, const Train *train)
 431 {
 432         if(&block==pending_block && !train)
 433                 reserve_more();
 434 }
 435
 436 unsigned Train::reserve_more()
 437 {
 438         BlockRef *last = 0;
 439         if(!rsv_blocks.empty())
 440                 last = &rsv_blocks.back();
 441         else if(!cur_blocks.empty())
 442                 last = &cur_blocks.back();
 443         if(!last)
 444                 return 0;
 445
 446         pending_block = 0;
 447
 448         // See how many sensor blocks we already have
 449         unsigned nsens = 0;
 450         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 451                 if(i->block->get_sensor_id())
 452                         ++nsens;
 453
 454         const Route *cur_route = 0;
 455         if(route)
 456         {
 457                 unsigned exit = last->block->traverse(last->entry);
 458                 Track *track = last->block->get_endpoints()[exit].track;
 459                 if(route->get_tracks().count(track))
 460                         cur_route = route;
 461                 else if(next_route && next_route->get_tracks().count(track))
 462                         cur_route = next_route;
 463         }
 464
 465         bool got_more = false;
 466         BlockRef *good = last;
 467         unsigned good_sens = nsens;
 468         while(good_sens<3)
 469         {
 470                 // Traverse to the next block
 471                 unsigned exit = last->block->traverse(last->entry);
 472                 Block *link = last->block->get_link(exit);
 473                 if(!link)
 474                         break;
 475
 476                 int entry = link->get_endpoint_by_link(*last->block);
 477                 if(entry<0)
 478                         throw LogicError("Block links are inconsistent!");
 479
 480                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 481
 482                 if(cur_route)
 483                 {
 484                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 485                                 cur_route = next_route;
 486                         else if(!cur_route->get_tracks().count(entry_ep.track))
 487                         {
 488                                 // Keep the blocks if we arrived at the end of the route
 489                                 good = last;
 490                                 good_sens = nsens;
 491                                 end_of_route = true;
 492                                 break;
 493                         }
 494                 }
 495                 else if(route && route->get_tracks().count(entry_ep.track))
 496                         cur_route = route;
 497
 498                 if(!link->reserve(this))
 499                 {
 500                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 501                         int other_entry = link->get_train()->get_entry_to_block(*link);
 502                         if(other_entry<0)
 503                                 throw LogicError("Block reservation inconsistency");
 504                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 505                         {
 506                                 good = last;
 507                                 good_sens = nsens;
 508                         }
 509                         pending_block = link;
 510                         break;
 511                 }
 512
 513                 if(link->get_turnout_id())
 514                 {
 515                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 516
 517                         // Keep the blocks reserved so far, as either us or the other train can diverge
 518                         good = last;
 519                         good_sens = nsens;
 520
 521                         // Figure out what path we'd like to take on the turnout
 522                         int path = -1;
 523                         if(cur_route)
 524                                 path = cur_route->get_turnout(link->get_turnout_id());
 525                         if(path<0)
 526                                 path = entry_ep.track->get_active_path();
 527                         if(!((track_ep.paths>>path)&1))
 528                         {
 529                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 530                                         if((track_ep.paths>>i)&1)
 531                                                 path = i;
 532                         }
 533
 534                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 535                         {
 536                                 // The turnout is set to wrong path - switch and wait for it
 537                                 link->reserve(0);
 538                                 pending_block = link;
 539                                 entry_ep.track->set_active_path(path);
 540                                 break;
 541                         }
 542                 }
 543
 544                 rsv_blocks.push_back(BlockRef(link, entry));
 545                 last = &rsv_blocks.back();
 546                 if(last->block->get_sensor_id())
 547                 {
 548                         ++nsens;
 549                         got_more = true;
 550                 }
 551         }
 552
 553         // Unreserve blocks that were not good
 554         while(!rsv_blocks.empty() && last!=good)
 555         {
 556                 last->block->reserve(0);
 557                 rsv_blocks.erase(--rsv_blocks.end());
 558                 if(!rsv_blocks.empty())
 559                         last = &rsv_blocks.back();
 560         }
 561
 562         if(got_more)
 563                 update_speed();
 564
 565         return good_sens;
 566 }
 567
 568 void Train::update_speed()
 569 {
 570         Driver &driver = layout.get_driver();
 571
 572         unsigned speed;
 573         if(!target_speed)
 574         {
 575                 speed = 0;
 576                 set_status("Stopped");
 577         }
 578         else
 579         {
 580                 unsigned nsens = 0;
 581                 for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 582                         if(i->block->get_sensor_id())
 583                                 ++nsens;
 584
 585                 unsigned slow_speed = find_speed(0.1);  // 31.3 km/h
 586                 if(nsens==0)
 587                 {
 588                         speed = 0;
 589                         pure_speed = false;
 590                         set_status("Blocked");
 591                 }
 592                 else if(nsens==1 && target_speed>slow_speed)
 593                 {
 594                         speed = slow_speed;
 595                         pure_speed = false;
 596                         set_status("Slow");
 597                 }
 598                 else
 599                 {
 600                         speed = target_speed;
 601                         set_status(format("Traveling %d kmh", travel_speed));
 602                 }
 603         }
 604
 605         driver.set_loco_speed(address, speed);
 606 }
 607
 608 float Train::get_real_speed(unsigned i) const
 609 {
 610         if(real_speed[i].weight)
 611                 return real_speed[i].speed;
 612
 613         unsigned low;
 614         unsigned high;
 615         for(low=i; low>0; --low)
 616                 if(real_speed[low].weight)
 617                         break;
 618         for(high=i; high<14; ++high)
 619                 if(real_speed[high].weight)
 620                         break;
 621
 622         if(real_speed[high].weight)
 623         {
 624                 if(real_speed[low].weight)
 625                 {
 626                         float f = float(i-low)/(high-low);
 627                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 628                 }
 629                 else
 630                         return real_speed[high].speed*float(i)/high;
 631         }
 632         else if(real_speed[low].weight)
 633                 return real_speed[low].speed*float(i)/low;
 634         else
 635                 return 0;
 636 }
 637
 638 unsigned Train::find_speed(float real) const
 639 {
 640         if(real<=real_speed[0].speed)
 641                 return 0;
 642
 643         unsigned low = 0;
 644         unsigned high = 0;
 645         for(unsigned i=0; (!high && i<=14); ++i)
 646                 if(real_speed[i].weight)
 647                 {
 648                         if(real_speed[i].speed<real)
 649                                 low = i;
 650                         else
 651                                 high = i;
 652                 }
 653         if(!high)
 654         {
 655                 if(!low)
 656                         return 0;
 657                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 658         }
 659
 660         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 661         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 662 }
 663
 664 void Train::set_status(const string &s)
 665 {
 666         status = s;
 667         signal_status_changed.emit(s);
 668 }
 669
 670 void Train::set_position(const Block::Endpoint &bep)
 671 {
 672         cur_track = bep.track;
 673         cur_track_ep = bep.track_ep;
 674         offset = 0;
 675         pos = cur_track->get_endpoint_position(cur_track_ep);
 676 }
 677
 678 void Train::release_blocks(list<BlockRef> &blocks)
 679 {
 680         release_blocks(blocks, blocks.begin(), blocks.end());
 681 }
 682
 683 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 684 {
 685         while(begin!=end)
 686         {
 687                 Block *block = begin->block;
 688                 blocks.erase(begin++);
 689                 block->reserve(0);
 690         }
 691 }
 692
 693 void Train::reverse_blocks(list<BlockRef> &blocks) const
 694 {
 695         blocks.reverse();
 696         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 697                 i->entry = i->block->traverse(i->entry);
 698 }
 699
 700
 701 Train::BlockRef::BlockRef(Block *b, unsigned e):
 702         block(b),
 703         entry(e)
 704 { }
 705
 706 Train::BlockRef Train::BlockRef::next() const
 707 {
 708         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 709         if(!blk)
 710                 throw InvalidState("At end of line");
 711
 712         int ep = blk->get_endpoint_by_link(*block);
 713         if(ep<0)
 714                 throw LogicError("Block links are inconsistent");
 715
 716         return BlockRef(blk, ep);
 717 }
 718
 719
 720 Train::RealSpeed::RealSpeed():
 721         speed(0),
 722         weight(0)
 723 { }
 724
 725 void Train::RealSpeed::add(float s, float w)
 726 {
 727         speed = (speed*weight+s*w)/(weight+w);
 728         weight = min(weight+w, 300.0f);
 729 }
 730
 731
 732 Train::Loader::Loader(Train &t):
 733         DataFile::BasicLoader<Train>(t),
 734         prev_block(0)
 735 {
 736         add("block",       &Loader::block);
 737         add("block_hint",  &Loader::block_hint);
 738         add("name",        &Loader::name);
 739         add("real_speed",  &Loader::real_speed);
 740         add("route",       &Loader::route);
 741 }
 742
 743 void Train::Loader::block(unsigned id)
 744 {
 745         Block &blk = obj.layout.get_block(id);
 746         int entry = -1;
 747         if(prev_block)
 748                 entry = blk.get_endpoint_by_link(*prev_block);
 749         if(entry<0)
 750                 entry = 0;
 751
 752         blk.reserve(&obj);
 753         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 754         obj.set_status("Stopped");
 755         obj.set_position(blk.get_endpoints()[entry]);
 756
 757         prev_block = &blk;
 758 }
 759
 760 void Train::Loader::block_hint(unsigned id)
 761 {
 762         prev_block = &obj.layout.get_block(id);
 763 }
 764
 765 void Train::Loader::name(const string &n)
 766 {
 767         obj.set_name(n);
 768 }
 769
 770 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 771 {
 772         obj.real_speed[i].speed = speed;
 773         obj.real_speed[i].weight = weight;
 774 }
 775
 776 void Train::Loader::route(const string &n)
 777 {
 778         obj.set_route(&obj.layout.get_route(n));
 779 }
 780
 781 } // namespace Marklin