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