source/libmarklin/train.cpp

   1 /* $Id$
   2
   3 This file is part of the MSP Märklin suite
   4 Copyright © 2006-2010  Mikkosoft Productions, Mikko Rasa
   5 Distributed under the GPL
   6 */
   7
   8 #include <cmath>
   9 #include <msp/strings/formatter.h>
  10 #include <msp/time/units.h>
  11 #include <msp/time/utils.h>
  12 #include "aicontrol.h"
  13 #include "catalogue.h"
  14 #include "driver.h"
  15 #include "layout.h"
  16 #include "locotype.h"
  17 #include "route.h"
  18 #include "simplephysics.h"
  19 #include "timetable.h"
  20 #include "tracktype.h"
  21 #include "train.h"
  22 #include "vehicle.h"
  23
  24 using namespace std;
  25 using namespace Msp;
  26
  27 namespace Marklin {
  28
  29 Train::Train(Layout &l, const LocoType &t, unsigned a):
  30         layout(l),
  31         loco_type(t),
  32         address(a),
  33         pending_block(0),
  34         control(new AIControl(*this, new SimplePhysics)),
  35         timetable(0),
  36         active(false),
  37         current_speed(0),
  38         speed_changing(false),
  39         reverse(false),
  40         functions(0),
  41         route(0),
  42         next_route(0),
  43         end_of_route(false),
  44         status("Unplaced"),
  45         travel_dist(0),
  46         pure_speed(false),
  47         real_speed(15),
  48         accurate_position(false),
  49         overshoot_dist(false)
  50 {
  51         vehicles.push_back(new Vehicle(layout, loco_type));
  52
  53         layout.add_train(*this);
  54
  55         layout.get_driver().add_loco(address);
  56         layout.get_driver().signal_loco_speed.connect(sigc::mem_fun(this, &Train::loco_speed_event));
  57         layout.get_driver().signal_loco_function.connect(sigc::mem_fun(this, &Train::loco_func_event));
  58
  59         layout.signal_block_reserved.connect(sigc::mem_fun(this, &Train::block_reserved));
  60         layout.get_driver().signal_sensor.connect(sigc::mem_fun(this, &Train::sensor_event));
  61         layout.get_driver().signal_turnout.connect(sigc::mem_fun(this, &Train::turnout_event));
  62
  63         control->signal_control_changed.connect(signal_control_changed);
  64 }
  65
  66 Train::~Train()
  67 {
  68         delete control;
  69         delete timetable;
  70         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  71                 delete *i;
  72         layout.remove_train(*this);
  73 }
  74
  75 void Train::set_name(const string &n)
  76 {
  77         name = n;
  78
  79         signal_name_changed.emit(name);
  80 }
  81
  82 Vehicle &Train::get_vehicle(unsigned i)
  83 {
  84         if(i>=vehicles.size())
  85                 throw InvalidParameterValue("Vehicle index out of range");
  86         return *vehicles[i];
  87 }
  88
  89 const Vehicle &Train::get_vehicle(unsigned i) const
  90 {
  91         if(i>=vehicles.size())
  92                 throw InvalidParameterValue("Vehicle index out of range");
  93         return *vehicles[i];
  94 }
  95
  96 void Train::set_control(const string &n, float v)
  97 {
  98         control->set_control(n, v);
  99 }
 100
 101 void Train::set_active(bool a)
 102 {
 103         if(a==active)
 104                 return;
 105         if(!a && control->get_speed())
 106                 throw InvalidState("Can't deactivate while moving");
 107
 108         active = a;
 109         if(active)
 110         {
 111                 stop_timeout = Time::TimeStamp();
 112                 reserve_more();
 113         }
 114         else
 115         {
 116                 stop_timeout = Time::now()+2*Time::sec;
 117                 set_status("Stopped");
 118         }
 119 }
 120
 121 void Train::set_function(unsigned func, bool state)
 122 {
 123         if(!loco_type.get_functions().count(func))
 124                 throw InvalidParameterValue("Invalid function");
 125         if(func<5)
 126                 layout.get_driver().set_loco_function(address, func, state);
 127         else
 128                 layout.get_driver().set_loco_function(address+1, func-4, state);
 129 }
 130
 131 bool Train::get_function(unsigned func) const
 132 {
 133         return (functions>>func)&1;
 134 }
 135
 136 void Train::set_route(const Route *r)
 137 {
 138         if(!rsv_blocks.empty())
 139         {
 140                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 141                         if(i->block->get_sensor_id())
 142                         {
 143                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 144                                 break;
 145                         }
 146         }
 147
 148         route = r;
 149         next_route = 0;
 150         end_of_route = false;
 151
 152         if(route)
 153         {
 154                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 155                 BlockRef next = last.next();
 156                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 157                 if(!route->get_tracks().count(ep.track))
 158                 {
 159                         next_route = route;
 160                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 161                 }
 162         }
 163
 164         if(active)
 165                 reserve_more();
 166
 167         signal_route_changed.emit(route);
 168 }
 169
 170 void Train::go_to(const Track &to)
 171 {
 172         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 173                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 174                 {
 175                         signal_arrived.emit();
 176                         set_route(0);
 177                         return;
 178                 }
 179
 180         BlockRef *last = 0;
 181         if(rsv_blocks.empty())
 182                 last = &cur_blocks.back();
 183         else
 184         {
 185                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 186                         if(i->block->get_sensor_id())
 187                                 last = &*i;
 188         }
 189
 190         BlockRef next = last->next();
 191         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 192
 193         set_route(Route::find(*ep.track, ep.track_ep, to));
 194 }
 195
 196 void Train::place(Block &block, unsigned entry)
 197 {
 198         if(control->get_speed())
 199                 throw InvalidState("Must be stopped before placing");
 200
 201         release_blocks(rsv_blocks);
 202         release_blocks(cur_blocks);
 203
 204         set_active(false);
 205         accurate_position = false;
 206
 207         if(!block.reserve(this))
 208         {
 209                 set_status("Unplaced");
 210                 return;
 211         }
 212
 213         cur_blocks.push_back(BlockRef(&block, entry));
 214         if(reverse)
 215         {
 216                 unsigned exit = block.traverse(entry);
 217                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 218                 Track *track = bep.track->get_link(bep.track_ep);
 219                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 220                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 221         }
 222         else
 223         {
 224                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 225                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 226         }
 227 }
 228
 229 bool Train::free_block(Block &block)
 230 {
 231         unsigned nsens = 0;
 232         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 233         {
 234                 if(i->block==&block)
 235                 {
 236                         if(nsens<1)
 237                                 return false;
 238                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 239                         return true;
 240                 }
 241                 else if(i->block->get_sensor_id())
 242                         ++nsens;
 243         }
 244
 245         return false;
 246 }
 247
 248 int Train::get_entry_to_block(Block &block) const
 249 {
 250         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 251                 if(i->block==&block)
 252                         return i->entry;
 253         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 254                 if(i->block==&block)
 255                         return i->entry;
 256         return -1;
 257 }
 258
 259 float Train::get_reserved_distance() const
 260 {
 261         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 262         const VehicleType &vtype = veh.get_type();
 263
 264         Track *track = veh.get_track();
 265         if(!track)
 266                 return 0;
 267         unsigned entry = veh.get_entry();
 268
 269         float result = -vtype.get_length()/2;
 270         if(reverse)
 271         {
 272                 entry = track->traverse(entry);
 273                 result += veh.get_offset();
 274         }
 275         else
 276                 result -= veh.get_offset();
 277
 278         bool first = true;
 279         list<BlockRef>::const_iterator block = cur_blocks.begin();
 280         while(1)
 281         {
 282                 if(!first || !reverse)
 283                         result += track->get_type().get_path_length(track->get_active_path());
 284                 first = false;
 285
 286                 if(track->get_type().get_endpoints().size()<2)
 287                         return result;
 288
 289                 unsigned exit = track->traverse(entry);
 290                 Track *next = track->get_link(exit);
 291
 292                 while(!block->block->get_tracks().count(next))
 293                 {
 294                         ++block;
 295                         if(block==cur_blocks.end())
 296                                 block = rsv_blocks.begin();
 297                         if(block==rsv_blocks.end())
 298                                 return result;
 299                 }
 300
 301                 entry = next->get_endpoint_by_link(*track);
 302                 track = next;
 303         }
 304 }
 305
 306 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 307 {
 308         if(!active && stop_timeout && t>=stop_timeout)
 309         {
 310                 release_blocks(rsv_blocks);
 311                 end_of_route = false;
 312                 stop_timeout = Time::TimeStamp();
 313         }
 314
 315         Driver &driver = layout.get_driver();
 316
 317         if(timetable)
 318                 timetable->tick(t);
 319         control->tick(dt);
 320         float speed = control->get_speed();
 321         unsigned speed_notch = find_speed(abs(speed));
 322
 323         if(speed && (speed<0)!=reverse)
 324         {
 325                 driver.set_loco_reverse(address, speed<0);
 326                 reverse = speed<0;
 327
 328                 release_blocks(rsv_blocks);
 329                 reverse_blocks(cur_blocks);
 330
 331                 reserve_more();
 332         }
 333         if(speed_notch!=current_speed && !speed_changing && !driver.is_halted() && driver.get_power())
 334         {
 335                 speed_changing = true;
 336                 driver.set_loco_speed(address, speed_notch);
 337
 338                 pure_speed = false;
 339
 340                 if(speed_notch)
 341                         set_status(format("Traveling %d kmh", get_travel_speed()));
 342                 else
 343                         set_status("Waiting");
 344         }
 345
 346         if(speed)
 347         {
 348                 if(!active)
 349                         set_active(true);
 350
 351                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 352                 Track *track = vehicle.get_track();
 353
 354                 bool ok = false;
 355                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 356                         ok = i->block->get_tracks().count(track);
 357
 358                 float d = get_real_speed(current_speed)*(dt/Time::sec);
 359                 if(ok)
 360                         vehicle.advance(reverse ? -d : d);
 361                 else if(accurate_position)
 362                 {
 363                         overshoot_dist += d;
 364                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 365                                 layout.emergency(name+" has not arrived at sensor");
 366                 }
 367         }
 368         else if(end_of_route)
 369                 set_route(0);
 370 }
 371
 372 void Train::save(list<DataFile::Statement> &st) const
 373 {
 374         st.push_back((DataFile::Statement("name"), name));
 375
 376         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 377                 if(i!=vehicles.begin())
 378                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 379
 380         for(unsigned i=0; i<=14; ++i)
 381                 if(real_speed[i].weight)
 382                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 383
 384         if(!cur_blocks.empty())
 385         {
 386                 list<BlockRef> blocks = cur_blocks;
 387                 if(reverse)
 388                         reverse_blocks(blocks);
 389
 390                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 391                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 392
 393                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 394                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 395         }
 396
 397         if(route)
 398         {
 399                 if(!route->is_temporary())
 400                         st.push_back((DataFile::Statement("route"), route->get_name()));
 401                 else if(next_route && !next_route->is_temporary())
 402                         st.push_back((DataFile::Statement("route"), next_route->get_name()));
 403         }
 404
 405         if(timetable)
 406         {
 407                 DataFile::Statement ss("timetable");
 408                 timetable->save(ss.sub);
 409                 st.push_back(ss);
 410         }
 411 }
 412
 413 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 414 {
 415         if(addr==address)
 416         {
 417                 current_speed = speed;
 418                 speed_changing = false;
 419                 pure_speed = false;
 420         }
 421 }
 422
 423 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 424 {
 425         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 426         {
 427                 if(addr==address+1)
 428                         func += 4;
 429                 if(state)
 430                         functions |= 1<<func;
 431                 else
 432                         functions &= ~(1<<func);
 433
 434                 signal_function_changed.emit(func, state);
 435         }
 436 }
 437
 438 void Train::sensor_event(unsigned addr, bool state)
 439 {
 440         if(state)
 441         {
 442                 // Find the first sensor block from our reserved blocks that isn't this sensor
 443                 list<BlockRef>::iterator i;
 444                 unsigned result = 0;
 445                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 446                         if(i->block->get_sensor_id())
 447                         {
 448                                 if(i->block->get_sensor_id()!=addr)
 449                                 {
 450                                         if(result==0)
 451                                                 result = 2;
 452                                         else if(result==1)
 453                                                 break;
 454                                 }
 455                                 else if(result==0)
 456                                         result = 1;
 457                                 else if(result==2)
 458                                         result = 3;
 459                         }
 460
 461                 if(result==1 && i!=rsv_blocks.begin())
 462                 {
 463                         // Compute speed and update related state
 464                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 465
 466                         if(pure_speed)
 467                         {
 468                                 RealSpeed &rs = real_speed[current_speed];
 469                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 470                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 471                         }
 472
 473                         travel_dist = 0;
 474                         float block_len;
 475                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 476                         {
 477                                 j->block->traverse(j->entry, &block_len);
 478                                 travel_dist += block_len;
 479
 480                                 if(j->block->get_sensor_id()==addr)
 481                                 {
 482                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 483                                         if(reverse)
 484                                         {
 485                                                 Track *track = bep.track->get_link(bep.track_ep);
 486                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 487                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 488                                         }
 489                                         else
 490                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 491                                 }
 492                         }
 493                         last_entry_time = Time::now();
 494                         pure_speed = true;
 495                         accurate_position = true;
 496                         overshoot_dist = 0;
 497
 498                         // Check if we've reached the next route
 499                         if(next_route)
 500                         {
 501                                 const set<const Track *> &rtracks = next_route->get_tracks();
 502                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 503                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 504                                         {
 505                                                 route = next_route;
 506                                                 next_route = 0;
 507                                                 // XXX Exceptions?
 508                                                 signal_route_changed.emit(route);
 509                                                 break;
 510                                         }
 511                         }
 512
 513                         // Move blocks up to the next sensor to our current blocks
 514                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 515
 516                         // Try to get more blocks if we're moving
 517                         if(active)
 518                         {
 519                                 unsigned nsens = reserve_more();
 520                                 if(!nsens && end_of_route)
 521                                         signal_arrived.emit();
 522                         }
 523                 }
 524                 else if(result==3)
 525                         layout.emergency("Sensor for "+name+" triggered out of order");
 526         }
 527         else
 528         {
 529                 // Find the first sensor in our current blocks that's still active
 530                 list<BlockRef>::iterator end = cur_blocks.begin();
 531                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 532                         if(i->block->get_sensor_id())
 533                         {
 534                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 535                                         break;
 536                                 else
 537                                         end = i;
 538                         }
 539
 540                 if(end!=cur_blocks.begin())
 541                 {
 542                         // Free blocks up to the last inactive sensor
 543                         ++end;
 544                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 545                 }
 546         }
 547 }
 548
 549 void Train::turnout_event(unsigned addr, bool)
 550 {
 551         if(pending_block)
 552         {
 553                 unsigned pending_addr = pending_block->get_turnout_id();
 554                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 555                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 556                         reserve_more();
 557         }
 558 }
 559
 560 void Train::block_reserved(const Block &block, const Train *train)
 561 {
 562         if(&block==pending_block && !train)
 563                 reserve_more();
 564 }
 565
 566 unsigned Train::reserve_more()
 567 {
 568         BlockRef *last = 0;
 569         if(!rsv_blocks.empty())
 570                 last = &rsv_blocks.back();
 571         else if(!cur_blocks.empty())
 572                 last = &cur_blocks.back();
 573         if(!last)
 574                 return 0;
 575
 576         pending_block = 0;
 577
 578         // See how many sensor blocks we already have
 579         unsigned nsens = 0;
 580         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 581                 if(i->block->get_sensor_id())
 582                         ++nsens;
 583
 584         if(end_of_route)
 585                 return nsens;
 586
 587         const Route *cur_route = 0;
 588         if(route)
 589         {
 590                 const set<Track *> &tracks = last->block->get_tracks();
 591                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 592                 {
 593                         if(route->get_tracks().count(*i))
 594                                 cur_route = route;
 595                         else if(next_route && next_route->get_tracks().count(*i))
 596                                 cur_route = next_route;
 597                 }
 598         }
 599
 600         bool got_more = false;
 601         BlockRef *good = last;
 602         unsigned good_sens = nsens;
 603         while(good_sens<3)
 604         {
 605                 if(last->block->get_endpoints().size()<2)
 606                 {
 607                         good = last;
 608                         good_sens = nsens;
 609                         break;
 610                 }
 611
 612                 // Traverse to the next block
 613                 unsigned exit = last->block->traverse(last->entry);
 614                 Block *link = last->block->get_link(exit);
 615                 if(!link)
 616                         break;
 617
 618                 int entry = link->get_endpoint_by_link(*last->block);
 619                 if(entry<0)
 620                         throw LogicError("Block links are inconsistent!");
 621
 622                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 623
 624                 if(cur_route)
 625                 {
 626                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 627                                 cur_route = next_route;
 628                         else if(!cur_route->get_tracks().count(entry_ep.track))
 629                         {
 630                                 // Keep the blocks if we arrived at the end of the route
 631                                 good = last;
 632                                 good_sens = nsens;
 633                                 end_of_route = true;
 634                                 break;
 635                         }
 636                 }
 637                 else if(route && route->get_tracks().count(entry_ep.track))
 638                         cur_route = route;
 639
 640                 if(!link->reserve(this))
 641                 {
 642                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 643                         int other_entry = link->get_train()->get_entry_to_block(*link);
 644                         if(other_entry<0)
 645                                 throw LogicError("Block reservation inconsistency");
 646                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 647                         {
 648                                 good = last;
 649                                 good_sens = nsens;
 650                         }
 651                         pending_block = link;
 652                         break;
 653                 }
 654
 655                 if(link->get_turnout_id())
 656                 {
 657                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 658
 659                         // Keep the blocks reserved so far, as either us or the other train can diverge
 660                         good = last;
 661                         good_sens = nsens;
 662
 663                         // Figure out what path we'd like to take on the turnout
 664                         int path = -1;
 665                         if(cur_route)
 666                                 path = cur_route->get_turnout(link->get_turnout_id());
 667                         if(path<0)
 668                                 path = entry_ep.track->get_active_path();
 669                         if(!((track_ep.paths>>path)&1))
 670                         {
 671                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 672                                         if((track_ep.paths>>i)&1)
 673                                                 path = i;
 674                         }
 675
 676                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 677                         {
 678                                 // The turnout is set to wrong path - switch and wait for it
 679                                 link->reserve(0);
 680                                 pending_block = link;
 681                                 entry_ep.track->set_active_path(path);
 682                                 break;
 683                         }
 684                 }
 685
 686                 rsv_blocks.push_back(BlockRef(link, entry));
 687                 last = &rsv_blocks.back();
 688                 if(last->block->get_sensor_id())
 689                 {
 690                         ++nsens;
 691                         got_more = true;
 692                 }
 693         }
 694
 695         // Unreserve blocks that were not good
 696         while(!rsv_blocks.empty() && last!=good)
 697         {
 698                 last->block->reserve(0);
 699                 rsv_blocks.erase(--rsv_blocks.end());
 700                 if(!rsv_blocks.empty())
 701                         last = &rsv_blocks.back();
 702         }
 703
 704         // Make any sensorless blocks at the beginning immediately current
 705         list<BlockRef>::iterator i;
 706         for(i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !i->block->get_sensor_id()); ++i) ;
 707         if(i!=rsv_blocks.begin())
 708                 cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 709
 710         return good_sens;
 711 }
 712
 713 float Train::get_real_speed(unsigned i) const
 714 {
 715         if(real_speed[i].weight)
 716                 return real_speed[i].speed;
 717
 718         unsigned low;
 719         unsigned high;
 720         for(low=i; low>0; --low)
 721                 if(real_speed[low].weight)
 722                         break;
 723         for(high=i; high<14; ++high)
 724                 if(real_speed[high].weight)
 725                         break;
 726
 727         if(real_speed[high].weight)
 728         {
 729                 if(real_speed[low].weight)
 730                 {
 731                         float f = float(i-low)/(high-low);
 732                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 733                 }
 734                 else
 735                         return real_speed[high].speed*float(i)/high;
 736         }
 737         else if(real_speed[low].weight)
 738                 return real_speed[low].speed*float(i)/low;
 739         else
 740                 return 0;
 741 }
 742
 743 unsigned Train::find_speed(float real) const
 744 {
 745         if(real<=real_speed[0].speed)
 746                 return 0;
 747
 748         unsigned low = 0;
 749         unsigned high = 0;
 750         for(unsigned i=0; (!high && i<=14); ++i)
 751                 if(real_speed[i].weight)
 752                 {
 753                         if(real_speed[i].speed<real)
 754                                 low = i;
 755                         else
 756                                 high = i;
 757                 }
 758         if(!high)
 759         {
 760                 if(!low)
 761                         return 0;
 762                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 763         }
 764
 765         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 766         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 767 }
 768
 769 float Train::get_travel_speed() const
 770 {
 771         float speed = get_real_speed(current_speed);
 772         float scale = layout.get_catalogue().get_scale();
 773         return static_cast<int>(round(speed/scale*3.6/5))*5;
 774 }
 775
 776 void Train::set_status(const string &s)
 777 {
 778         status = s;
 779         signal_status_changed.emit(s);
 780 }
 781
 782 void Train::release_blocks(list<BlockRef> &blocks)
 783 {
 784         release_blocks(blocks, blocks.begin(), blocks.end());
 785 }
 786
 787 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 788 {
 789         while(begin!=end)
 790         {
 791                 Block *block = begin->block;
 792                 blocks.erase(begin++);
 793                 block->reserve(0);
 794         }
 795 }
 796
 797 void Train::reverse_blocks(list<BlockRef> &blocks) const
 798 {
 799         blocks.reverse();
 800         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 801                 i->entry = i->block->traverse(i->entry);
 802 }
 803
 804
 805 Train::BlockRef::BlockRef(Block *b, unsigned e):
 806         block(b),
 807         entry(e)
 808 { }
 809
 810 Train::BlockRef Train::BlockRef::next() const
 811 {
 812         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 813         if(!blk)
 814                 throw InvalidState("At end of line");
 815
 816         int ep = blk->get_endpoint_by_link(*block);
 817         if(ep<0)
 818                 throw LogicError("Block links are inconsistent");
 819
 820         return BlockRef(blk, ep);
 821 }
 822
 823
 824 Train::RealSpeed::RealSpeed():
 825         speed(0),
 826         weight(0)
 827 { }
 828
 829 void Train::RealSpeed::add(float s, float w)
 830 {
 831         speed = (speed*weight+s*w)/(weight+w);
 832         weight = min(weight+w, 300.0f);
 833 }
 834
 835
 836 Train::Loader::Loader(Train &t):
 837         DataFile::BasicLoader<Train>(t),
 838         prev_block(0)
 839 {
 840         add("block",       &Loader::block);
 841         add("block_hint",  &Loader::block_hint);
 842         add("name",        &Loader::name);
 843         add("real_speed",  &Loader::real_speed);
 844         add("route",       &Loader::route);
 845         add("timetable",   &Loader::timetable);
 846         add("vehicle",     &Loader::vehicle);
 847 }
 848
 849 void Train::Loader::block(unsigned id)
 850 {
 851         Block &blk = obj.layout.get_block(id);
 852         int entry = -1;
 853         if(prev_block)
 854                 entry = blk.get_endpoint_by_link(*prev_block);
 855         if(entry<0)
 856                 entry = 0;
 857
 858         blk.reserve(&obj);
 859         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 860         obj.set_status("Stopped");
 861         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 862         obj.vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 863
 864         if(blk.get_sensor_id())
 865                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 866
 867         prev_block = &blk;
 868 }
 869
 870 void Train::Loader::block_hint(unsigned id)
 871 {
 872         prev_block = &obj.layout.get_block(id);
 873 }
 874
 875 void Train::Loader::name(const string &n)
 876 {
 877         obj.set_name(n);
 878 }
 879
 880 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 881 {
 882         obj.real_speed[i].speed = speed;
 883         obj.real_speed[i].weight = weight;
 884 }
 885
 886 void Train::Loader::route(const string &n)
 887 {
 888         obj.set_route(&obj.layout.get_route(n));
 889 }
 890
 891 void Train::Loader::timetable()
 892 {
 893         if(obj.timetable)
 894                 throw InvalidState("A timetable has already been loaded");
 895
 896         obj.timetable = new Timetable(obj);
 897         load_sub(*obj.timetable);
 898 }
 899
 900 void Train::Loader::vehicle(unsigned n)
 901 {
 902         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 903         Vehicle *veh = new Vehicle(obj.layout, vtype);
 904         obj.vehicles.back()->attach_back(*veh);
 905         obj.vehicles.push_back(veh);
 906 }
 907
 908 } // namespace Marklin