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         layout.get_driver().signal_halt.connect(sigc::mem_fun(this, &Train::halt_event));
  64
  65         control->signal_control_changed.connect(signal_control_changed);
  66 }
  67
  68 Train::~Train()
  69 {
  70         delete control;
  71         delete timetable;
  72         for(vector<Vehicle *>::iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
  73                 delete *i;
  74         layout.remove_train(*this);
  75 }
  76
  77 void Train::set_name(const string &n)
  78 {
  79         name = n;
  80
  81         signal_name_changed.emit(name);
  82 }
  83
  84 Vehicle &Train::get_vehicle(unsigned i)
  85 {
  86         if(i>=vehicles.size())
  87                 throw InvalidParameterValue("Vehicle index out of range");
  88         return *vehicles[i];
  89 }
  90
  91 const Vehicle &Train::get_vehicle(unsigned i) const
  92 {
  93         if(i>=vehicles.size())
  94                 throw InvalidParameterValue("Vehicle index out of range");
  95         return *vehicles[i];
  96 }
  97
  98 void Train::set_control(const string &n, float v)
  99 {
 100         control->set_control(n, v);
 101 }
 102
 103 void Train::set_active(bool a)
 104 {
 105         if(a==active)
 106                 return;
 107         if(!a && control->get_speed())
 108                 throw InvalidState("Can't deactivate while moving");
 109
 110         active = a;
 111         if(active)
 112         {
 113                 stop_timeout = Time::TimeStamp();
 114                 reserve_more();
 115         }
 116         else
 117         {
 118                 stop_timeout = Time::now()+2*Time::sec;
 119                 set_status("Stopped");
 120         }
 121 }
 122
 123 void Train::set_function(unsigned func, bool state)
 124 {
 125         if(!loco_type.get_functions().count(func))
 126                 throw InvalidParameterValue("Invalid function");
 127         if(func<5)
 128                 layout.get_driver().set_loco_function(address, func, state);
 129         else
 130                 layout.get_driver().set_loco_function(address+1, func-4, state);
 131 }
 132
 133 bool Train::get_function(unsigned func) const
 134 {
 135         return (functions>>func)&1;
 136 }
 137
 138 void Train::set_route(const Route *r)
 139 {
 140         if(!rsv_blocks.empty())
 141         {
 142                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 143                         if(i->block->get_sensor_id())
 144                         {
 145                                 release_blocks(rsv_blocks, ++i, rsv_blocks.end());
 146                                 break;
 147                         }
 148         }
 149
 150         route = r;
 151         next_route = 0;
 152         end_of_route = false;
 153
 154         if(route)
 155         {
 156                 BlockRef &last = (rsv_blocks.empty() ? cur_blocks.back() : rsv_blocks.back());
 157                 BlockRef next = last.next();
 158                 const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 159                 if(!route->get_tracks().count(ep.track))
 160                 {
 161                         next_route = route;
 162                         route = Route::find(*ep.track, ep.track_ep, *next_route);
 163                 }
 164         }
 165
 166         if(active)
 167                 reserve_more();
 168
 169         signal_route_changed.emit(route);
 170 }
 171
 172 void Train::go_to(const Track &to)
 173 {
 174         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 175                 if(i->block->get_tracks().count(const_cast<Track *>(&to)))
 176                 {
 177                         signal_arrived.emit();
 178                         set_route(0);
 179                         return;
 180                 }
 181
 182         BlockRef *last = 0;
 183         if(rsv_blocks.empty())
 184                 last = &cur_blocks.back();
 185         else
 186         {
 187                 for(list<BlockRef>::iterator i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !last); ++i)
 188                         if(i->block->get_sensor_id())
 189                                 last = &*i;
 190         }
 191
 192         BlockRef next = last->next();
 193         const Block::Endpoint &ep = next.block->get_endpoints()[next.entry];
 194
 195         set_route(Route::find(*ep.track, ep.track_ep, to));
 196 }
 197
 198 void Train::place(Block &block, unsigned entry)
 199 {
 200         if(control->get_speed())
 201                 throw InvalidState("Must be stopped before placing");
 202
 203         release_blocks(rsv_blocks);
 204         release_blocks(cur_blocks);
 205
 206         set_active(false);
 207         accurate_position = false;
 208
 209         if(!block.reserve(this))
 210         {
 211                 set_status("Unplaced");
 212                 return;
 213         }
 214
 215         cur_blocks.push_back(BlockRef(&block, entry));
 216         if(reverse)
 217         {
 218                 unsigned exit = block.traverse(entry);
 219                 const Block::Endpoint &bep = block.get_endpoints()[exit];
 220                 Track *track = bep.track->get_link(bep.track_ep);
 221                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 222                 vehicles.front()->place(track, ep, 0, Vehicle::FRONT_BUFFER);
 223         }
 224         else
 225         {
 226                 const Block::Endpoint &bep = block.get_endpoints()[entry];
 227                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 228         }
 229 }
 230
 231 bool Train::free_block(Block &block)
 232 {
 233         unsigned nsens = 0;
 234         for(list<BlockRef>::iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 235         {
 236                 if(i->block==&block)
 237                 {
 238                         if(nsens<1)
 239                                 return false;
 240                         release_blocks(rsv_blocks, i, rsv_blocks.end());
 241                         return true;
 242                 }
 243                 else if(i->block->get_sensor_id())
 244                         ++nsens;
 245         }
 246
 247         return false;
 248 }
 249
 250 int Train::get_entry_to_block(Block &block) const
 251 {
 252         for(list<BlockRef>::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 253                 if(i->block==&block)
 254                         return i->entry;
 255         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 256                 if(i->block==&block)
 257                         return i->entry;
 258         return -1;
 259 }
 260
 261 float Train::get_reserved_distance() const
 262 {
 263         Vehicle &veh = *(reverse ? vehicles.back() : vehicles.front());
 264         const VehicleType &vtype = veh.get_type();
 265
 266         Track *track = veh.get_track();
 267         if(!track)
 268                 return 0;
 269         unsigned entry = veh.get_entry();
 270
 271         float result = -vtype.get_length()/2;
 272         if(reverse)
 273         {
 274                 entry = track->traverse(entry);
 275                 result += veh.get_offset();
 276         }
 277         else
 278                 result -= veh.get_offset();
 279
 280         bool first = true;
 281         list<BlockRef>::const_iterator block = cur_blocks.begin();
 282         while(1)
 283         {
 284                 if(!first || !reverse)
 285                         result += track->get_type().get_path_length(track->get_active_path());
 286                 first = false;
 287
 288                 if(track->get_type().get_endpoints().size()<2)
 289                         return result;
 290
 291                 unsigned exit = track->traverse(entry);
 292                 Track *next = track->get_link(exit);
 293
 294                 while(!block->block->get_tracks().count(next))
 295                 {
 296                         ++block;
 297                         if(block==cur_blocks.end())
 298                                 block = rsv_blocks.begin();
 299                         if(block==rsv_blocks.end())
 300                                 return result;
 301                 }
 302
 303                 entry = next->get_endpoint_by_link(*track);
 304                 track = next;
 305         }
 306 }
 307
 308 void Train::tick(const Time::TimeStamp &t, const Time::TimeDelta &dt)
 309 {
 310         if(!active && stop_timeout && t>=stop_timeout)
 311         {
 312                 release_blocks(rsv_blocks);
 313                 end_of_route = false;
 314                 stop_timeout = Time::TimeStamp();
 315         }
 316
 317         Driver &driver = layout.get_driver();
 318
 319         if(timetable)
 320                 timetable->tick(t);
 321         control->tick(dt);
 322         float speed = control->get_speed();
 323         unsigned speed_notch = find_speed(abs(speed));
 324
 325         if(control->get_reverse()!=reverse)
 326         {
 327                 reverse = control->get_reverse();
 328                 driver.set_loco_reverse(address, reverse);
 329
 330                 release_blocks(rsv_blocks);
 331                 reverse_blocks(cur_blocks);
 332
 333                 reserve_more();
 334         }
 335         if(speed_notch!=current_speed && !speed_changing && !driver.is_halted() && driver.get_power())
 336         {
 337                 speed_changing = true;
 338                 driver.set_loco_speed(address, speed_notch);
 339
 340                 pure_speed = false;
 341
 342                 if(speed_notch)
 343                         set_status(format("Traveling %d kmh", get_travel_speed()));
 344                 else
 345                         set_status("Waiting");
 346         }
 347
 348         if(speed)
 349         {
 350                 if(!active)
 351                         set_active(true);
 352
 353                 Vehicle &vehicle = *(reverse ? vehicles.back() : vehicles.front());
 354                 Track *track = vehicle.get_track();
 355
 356                 bool ok = false;
 357                 for(list<BlockRef>::const_iterator i=cur_blocks.begin(); (!ok && i!=cur_blocks.end()); ++i)
 358                         ok = i->block->get_tracks().count(track);
 359
 360                 float d = get_real_speed(current_speed)*(dt/Time::sec);
 361                 if(ok)
 362                         vehicle.advance(reverse ? -d : d);
 363                 else if(accurate_position)
 364                 {
 365                         overshoot_dist += d;
 366                         if(overshoot_dist>40*layout.get_catalogue().get_scale())
 367                         {
 368                                 layout.emergency(name+" has not arrived at sensor");
 369                                 accurate_position = false;
 370                         }
 371                 }
 372         }
 373         else if(end_of_route)
 374                 set_route(0);
 375
 376         if(!cur_blocks.empty() && !cur_blocks.front().block->get_sensor_id())
 377         {
 378                 Vehicle &veh = *(reverse ? vehicles.front() : vehicles.back());
 379
 380                 list<BlockRef>::iterator i = cur_blocks.begin();
 381                 const Block::Endpoint &bep = i->block->get_endpoints()[i->entry];
 382
 383                 Track *track = bep.track;
 384                 unsigned entry = bep.track_ep;
 385
 386                 bool found = false;
 387                 float dist = veh.get_offset()-veh.get_type().get_length()/2;
 388                 while(1)
 389                 {
 390                         if(track==veh.get_track())
 391                         {
 392                                 found = true;
 393                                 break;
 394                         }
 395
 396                         if(i!=cur_blocks.begin())
 397                         {
 398                                 float path_len = track->get_type().get_path_length(track->get_active_path());
 399                                 dist += path_len;
 400                         }
 401
 402                         unsigned exit = track->traverse(entry);
 403                         Track *next = track->get_link(exit);
 404                         entry = next->get_endpoint_by_link(*track);
 405                         track = next;
 406
 407                         if(!i->block->get_tracks().count(track))
 408                         {
 409                                 ++i;
 410                                 if(i==cur_blocks.end())
 411                                         break;
 412                         }
 413                 }
 414
 415                 if(found && i!=cur_blocks.begin() && dist>10*layout.get_catalogue().get_scale())
 416                 {
 417                         cur_blocks.front().block->reserve(0);
 418                         cur_blocks.erase(cur_blocks.begin());
 419                 }
 420         }
 421 }
 422
 423 void Train::save(list<DataFile::Statement> &st) const
 424 {
 425         st.push_back((DataFile::Statement("name"), name));
 426
 427         for(vector<Vehicle *>::const_iterator i=vehicles.begin(); i!=vehicles.end(); ++i)
 428                 if(i!=vehicles.begin())
 429                         st.push_back((DataFile::Statement("vehicle"), (*i)->get_type().get_article_number()));
 430
 431         for(unsigned i=0; i<=14; ++i)
 432                 if(real_speed[i].weight)
 433                         st.push_back((DataFile::Statement("real_speed"), i, real_speed[i].speed, real_speed[i].weight));
 434
 435         if(!cur_blocks.empty())
 436         {
 437                 list<BlockRef> blocks = cur_blocks;
 438                 if(reverse)
 439                         reverse_blocks(blocks);
 440
 441                 Block *prev = blocks.front().block->get_endpoints()[blocks.front().entry].link;
 442                 st.push_back((DataFile::Statement("block_hint"), prev->get_id()));
 443
 444                 for(list<BlockRef>::const_iterator i=blocks.begin(); i!=blocks.end(); ++i)
 445                         st.push_back((DataFile::Statement("block"), i->block->get_id()));
 446         }
 447
 448         if(route)
 449         {
 450                 if(!route->is_temporary())
 451                         st.push_back((DataFile::Statement("route"), route->get_name()));
 452                 else if(next_route && !next_route->is_temporary())
 453                         st.push_back((DataFile::Statement("route"), next_route->get_name()));
 454         }
 455
 456         if(timetable)
 457         {
 458                 DataFile::Statement ss("timetable");
 459                 timetable->save(ss.sub);
 460                 st.push_back(ss);
 461         }
 462 }
 463
 464 void Train::loco_speed_event(unsigned addr, unsigned speed, bool)
 465 {
 466         if(addr==address)
 467         {
 468                 current_speed = speed;
 469                 speed_changing = false;
 470                 pure_speed = false;
 471         }
 472 }
 473
 474 void Train::loco_func_event(unsigned addr, unsigned func, bool state)
 475 {
 476         if(addr==address || (addr==address+1 && loco_type.get_max_function()>4))
 477         {
 478                 if(addr==address+1)
 479                         func += 4;
 480                 if(state)
 481                         functions |= 1<<func;
 482                 else
 483                         functions &= ~(1<<func);
 484
 485                 signal_function_changed.emit(func, state);
 486         }
 487 }
 488
 489 void Train::sensor_event(unsigned addr, bool state)
 490 {
 491         if(state)
 492         {
 493                 // Find the first sensor block from our reserved blocks that isn't this sensor
 494                 list<BlockRef>::iterator i;
 495                 unsigned result = 0;
 496                 for(i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 497                         if(i->block->get_sensor_id())
 498                         {
 499                                 if(i->block->get_sensor_id()!=addr)
 500                                 {
 501                                         if(result==0)
 502                                                 result = 2;
 503                                         else if(result==1)
 504                                                 break;
 505                                 }
 506                                 else if(result==0)
 507                                         result = 1;
 508                                 else if(result==2)
 509                                         result = 3;
 510                         }
 511
 512                 if(result==1 && i!=rsv_blocks.begin())
 513                 {
 514                         // Compute speed and update related state
 515                         float travel_time_secs = (Time::now()-last_entry_time)/Time::sec;
 516
 517                         if(pure_speed)
 518                         {
 519                                 RealSpeed &rs = real_speed[current_speed];
 520                                 rs.add(travel_dist/travel_time_secs, travel_time_secs);
 521                                 set_status(format("Traveling %d kmh", get_travel_speed()));
 522                         }
 523
 524                         travel_dist = 0;
 525                         float block_len;
 526                         for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 527                         {
 528                                 j->block->traverse(j->entry, &block_len);
 529                                 travel_dist += block_len;
 530
 531                                 if(j->block->get_sensor_id()==addr)
 532                                 {
 533                                         const Block::Endpoint &bep = j->block->get_endpoints()[j->entry];
 534                                         if(reverse)
 535                                         {
 536                                                 Track *track = bep.track->get_link(bep.track_ep);
 537                                                 unsigned ep = track->get_endpoint_by_link(*bep.track);
 538                                                 vehicles.back()->place(track, ep, 0, Vehicle::BACK_AXLE);
 539                                         }
 540                                         else
 541                                                 vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::FRONT_AXLE);
 542                                 }
 543                         }
 544                         last_entry_time = Time::now();
 545                         pure_speed = true;
 546                         accurate_position = true;
 547                         overshoot_dist = 0;
 548
 549                         // Check if we've reached the next route
 550                         if(next_route)
 551                         {
 552                                 const set<const Track *> &rtracks = next_route->get_tracks();
 553                                 for(list<BlockRef>::iterator j=rsv_blocks.begin(); j!=i; ++j)
 554                                         if(rtracks.count(j->block->get_endpoints()[j->entry].track))
 555                                         {
 556                                                 route = next_route;
 557                                                 next_route = 0;
 558                                                 // XXX Exceptions?
 559                                                 signal_route_changed.emit(route);
 560                                                 break;
 561                                         }
 562                         }
 563
 564                         // Move blocks up to the next sensor to our current blocks
 565                         cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 566
 567                         // Try to get more blocks if we're moving
 568                         if(active)
 569                         {
 570                                 unsigned nsens = reserve_more();
 571                                 if(!nsens && end_of_route)
 572                                         signal_arrived.emit();
 573                         }
 574                 }
 575                 else if(result==3)
 576                         layout.emergency("Sensor for "+name+" triggered out of order");
 577         }
 578         else
 579         {
 580                 // Find the first sensor in our current blocks that's still active
 581                 list<BlockRef>::iterator end = cur_blocks.begin();
 582                 for(list<BlockRef>::iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 583                         if(i->block->get_sensor_id())
 584                         {
 585                                 if(layout.get_driver().get_sensor(i->block->get_sensor_id()))
 586                                         break;
 587                                 else
 588                                 {
 589                                         end = i;
 590                                         ++end;
 591                                 }
 592                         }
 593
 594                 if(end!=cur_blocks.begin())
 595                         // Free blocks up to the last inactive sensor
 596                         release_blocks(cur_blocks, cur_blocks.begin(), end);
 597         }
 598 }
 599
 600 void Train::turnout_event(unsigned addr, bool)
 601 {
 602         if(pending_block)
 603         {
 604                 unsigned pending_addr = pending_block->get_turnout_id();
 605                 bool double_addr = (*pending_block->get_tracks().begin())->get_type().is_double_address();
 606                 if(addr==pending_addr || (double_addr && addr==pending_addr+1))
 607                         reserve_more();
 608         }
 609 }
 610
 611 void Train::halt_event(bool h)
 612 {
 613         if(h)
 614                 accurate_position = false;
 615 }
 616
 617 void Train::block_reserved(const Block &block, const Train *train)
 618 {
 619         if(&block==pending_block && !train)
 620                 reserve_more();
 621 }
 622
 623 unsigned Train::reserve_more()
 624 {
 625         BlockRef *last = 0;
 626         if(!rsv_blocks.empty())
 627                 last = &rsv_blocks.back();
 628         else if(!cur_blocks.empty())
 629                 last = &cur_blocks.back();
 630         if(!last)
 631                 return 0;
 632
 633         pending_block = 0;
 634
 635         // See how many sensor blocks we already have
 636         unsigned nsens = 0;
 637         for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
 638                 if(i->block->get_sensor_id())
 639                         ++nsens;
 640
 641         if(end_of_route)
 642                 return nsens;
 643
 644         const Route *cur_route = 0;
 645         if(route)
 646         {
 647                 const set<Track *> &tracks = last->block->get_tracks();
 648                 for(set<Track *>::const_iterator i=tracks.begin(); (cur_route!=route && i!=tracks.end()); ++i)
 649                 {
 650                         if(route->get_tracks().count(*i))
 651                                 cur_route = route;
 652                         else if(next_route && next_route->get_tracks().count(*i))
 653                                 cur_route = next_route;
 654                 }
 655         }
 656
 657         bool got_more = false;
 658         BlockRef *good = last;
 659         unsigned good_sens = nsens;
 660         while(good_sens<3)
 661         {
 662                 if(last->block->get_endpoints().size()<2)
 663                 {
 664                         good = last;
 665                         good_sens = nsens;
 666                         break;
 667                 }
 668
 669                 // Traverse to the next block
 670                 unsigned exit = last->block->traverse(last->entry);
 671                 Block *link = last->block->get_link(exit);
 672                 if(!link)
 673                         break;
 674
 675                 int entry = link->get_endpoint_by_link(*last->block);
 676                 if(entry<0)
 677                         throw LogicError("Block links are inconsistent!");
 678
 679                 const Block::Endpoint &entry_ep = link->get_endpoints()[entry];
 680
 681                 if(cur_route)
 682                 {
 683                         if(cur_route!=next_route && next_route && next_route->get_tracks().count(entry_ep.track))
 684                                 cur_route = next_route;
 685                         else if(!cur_route->get_tracks().count(entry_ep.track))
 686                         {
 687                                 // Keep the blocks if we arrived at the end of the route
 688                                 good = last;
 689                                 good_sens = nsens;
 690                                 end_of_route = true;
 691                                 break;
 692                         }
 693                 }
 694                 else if(route && route->get_tracks().count(entry_ep.track))
 695                         cur_route = route;
 696
 697                 if(!link->reserve(this))
 698                 {
 699                         // If we found another train and it's not headed straight for us, we can keep the blocks we got
 700                         int other_entry = link->get_train()->get_entry_to_block(*link);
 701                         if(other_entry<0)
 702                                 throw LogicError("Block reservation inconsistency");
 703                         if(static_cast<unsigned>(entry)!=link->traverse(other_entry))
 704                         {
 705                                 good = last;
 706                                 good_sens = nsens;
 707                         }
 708                         pending_block = link;
 709                         break;
 710                 }
 711
 712                 if(link->get_turnout_id())
 713                 {
 714                         const Endpoint &track_ep = entry_ep.track->get_type().get_endpoints()[entry_ep.track_ep];
 715
 716                         // Keep the blocks reserved so far, as either us or the other train can diverge
 717                         good = last;
 718                         good_sens = nsens;
 719
 720                         // Figure out what path we'd like to take on the turnout
 721                         int path = -1;
 722                         if(cur_route)
 723                                 path = cur_route->get_turnout(link->get_turnout_id());
 724                         if(path<0)
 725                                 path = entry_ep.track->get_active_path();
 726                         if(!((track_ep.paths>>path)&1))
 727                         {
 728                                 for(unsigned i=0; track_ep.paths>>i; ++i)
 729                                         if((track_ep.paths>>i)&1)
 730                                                 path = i;
 731                         }
 732
 733                         if(path!=static_cast<int>(entry_ep.track->get_active_path()))
 734                         {
 735                                 // The turnout is set to wrong path - switch and wait for it
 736                                 link->reserve(0);
 737                                 pending_block = link;
 738                                 entry_ep.track->set_active_path(path);
 739                                 break;
 740                         }
 741                 }
 742
 743                 rsv_blocks.push_back(BlockRef(link, entry));
 744                 last = &rsv_blocks.back();
 745                 if(last->block->get_sensor_id())
 746                 {
 747                         ++nsens;
 748                         got_more = true;
 749                 }
 750         }
 751
 752         // Unreserve blocks that were not good
 753         while(!rsv_blocks.empty() && last!=good)
 754         {
 755                 last->block->reserve(0);
 756                 rsv_blocks.erase(--rsv_blocks.end());
 757                 if(!rsv_blocks.empty())
 758                         last = &rsv_blocks.back();
 759         }
 760
 761         // Make any sensorless blocks at the beginning immediately current
 762         list<BlockRef>::iterator i;
 763         for(i=rsv_blocks.begin(); (i!=rsv_blocks.end() && !i->block->get_sensor_id()); ++i) ;
 764         if(i!=rsv_blocks.begin())
 765                 cur_blocks.splice(cur_blocks.end(), rsv_blocks, rsv_blocks.begin(), i);
 766
 767         return good_sens;
 768 }
 769
 770 float Train::get_real_speed(unsigned i) const
 771 {
 772         if(real_speed[i].weight)
 773                 return real_speed[i].speed;
 774
 775         unsigned low;
 776         unsigned high;
 777         for(low=i; low>0; --low)
 778                 if(real_speed[low].weight)
 779                         break;
 780         for(high=i; high<14; ++high)
 781                 if(real_speed[high].weight)
 782                         break;
 783
 784         if(real_speed[high].weight)
 785         {
 786                 if(real_speed[low].weight)
 787                 {
 788                         float f = float(i-low)/(high-low);
 789                         return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
 790                 }
 791                 else
 792                         return real_speed[high].speed*float(i)/high;
 793         }
 794         else if(real_speed[low].weight)
 795                 return real_speed[low].speed*float(i)/low;
 796         else
 797                 return 0;
 798 }
 799
 800 unsigned Train::find_speed(float real) const
 801 {
 802         if(real<=real_speed[0].speed)
 803                 return 0;
 804
 805         unsigned low = 0;
 806         unsigned high = 0;
 807         for(unsigned i=0; (!high && i<=14); ++i)
 808                 if(real_speed[i].weight)
 809                 {
 810                         if(real_speed[i].speed<real)
 811                                 low = i;
 812                         else
 813                                 high = i;
 814                 }
 815         if(!high)
 816         {
 817                 if(!low)
 818                         return 0;
 819                 return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
 820         }
 821
 822         float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
 823         return static_cast<unsigned>(low*(1-f)+high*f+0.5);
 824 }
 825
 826 float Train::get_travel_speed() const
 827 {
 828         float speed = get_real_speed(current_speed);
 829         float scale = layout.get_catalogue().get_scale();
 830         return static_cast<int>(round(speed/scale*3.6/5))*5;
 831 }
 832
 833 void Train::set_status(const string &s)
 834 {
 835         status = s;
 836         signal_status_changed.emit(s);
 837 }
 838
 839 void Train::release_blocks(list<BlockRef> &blocks)
 840 {
 841         release_blocks(blocks, blocks.begin(), blocks.end());
 842 }
 843
 844 void Train::release_blocks(list<BlockRef> &blocks, list<BlockRef>::iterator begin, list<BlockRef>::iterator end)
 845 {
 846         while(begin!=end)
 847         {
 848                 Block *block = begin->block;
 849                 blocks.erase(begin++);
 850                 block->reserve(0);
 851         }
 852 }
 853
 854 void Train::reverse_blocks(list<BlockRef> &blocks) const
 855 {
 856         blocks.reverse();
 857         for(list<BlockRef>::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 858                 i->entry = i->block->traverse(i->entry);
 859 }
 860
 861
 862 Train::BlockRef::BlockRef(Block *b, unsigned e):
 863         block(b),
 864         entry(e)
 865 { }
 866
 867 Train::BlockRef Train::BlockRef::next() const
 868 {
 869         Block *blk = block->get_endpoints()[block->traverse(entry)].link;
 870         if(!blk)
 871                 throw InvalidState("At end of line");
 872
 873         int ep = blk->get_endpoint_by_link(*block);
 874         if(ep<0)
 875                 throw LogicError("Block links are inconsistent");
 876
 877         return BlockRef(blk, ep);
 878 }
 879
 880
 881 Train::RealSpeed::RealSpeed():
 882         speed(0),
 883         weight(0)
 884 { }
 885
 886 void Train::RealSpeed::add(float s, float w)
 887 {
 888         speed = (speed*weight+s*w)/(weight+w);
 889         weight = min(weight+w, 300.0f);
 890 }
 891
 892
 893 Train::Loader::Loader(Train &t):
 894         DataFile::BasicLoader<Train>(t),
 895         prev_block(0)
 896 {
 897         add("block",       &Loader::block);
 898         add("block_hint",  &Loader::block_hint);
 899         add("name",        &Loader::name);
 900         add("real_speed",  &Loader::real_speed);
 901         add("route",       &Loader::route);
 902         add("timetable",   &Loader::timetable);
 903         add("vehicle",     &Loader::vehicle);
 904 }
 905
 906 void Train::Loader::block(unsigned id)
 907 {
 908         Block &blk = obj.layout.get_block(id);
 909         int entry = -1;
 910         if(prev_block)
 911                 entry = blk.get_endpoint_by_link(*prev_block);
 912         if(entry<0)
 913                 entry = 0;
 914
 915         blk.reserve(&obj);
 916         obj.cur_blocks.push_back(BlockRef(&blk, entry));
 917         obj.set_status("Stopped");
 918         const Block::Endpoint &bep = blk.get_endpoints()[entry];
 919         obj.vehicles.front()->place(bep.track, bep.track_ep, 0, Vehicle::BACK_BUFFER);
 920
 921         if(blk.get_sensor_id())
 922                 obj.layout.get_driver().set_sensor(blk.get_sensor_id(), true);
 923
 924         prev_block = &blk;
 925 }
 926
 927 void Train::Loader::block_hint(unsigned id)
 928 {
 929         prev_block = &obj.layout.get_block(id);
 930 }
 931
 932 void Train::Loader::name(const string &n)
 933 {
 934         obj.set_name(n);
 935 }
 936
 937 void Train::Loader::real_speed(unsigned i, float speed, float weight)
 938 {
 939         obj.real_speed[i].speed = speed;
 940         obj.real_speed[i].weight = weight;
 941 }
 942
 943 void Train::Loader::route(const string &n)
 944 {
 945         obj.set_route(&obj.layout.get_route(n));
 946 }
 947
 948 void Train::Loader::timetable()
 949 {
 950         if(obj.timetable)
 951                 throw InvalidState("A timetable has already been loaded");
 952
 953         obj.timetable = new Timetable(obj);
 954         load_sub(*obj.timetable);
 955 }
 956
 957 void Train::Loader::vehicle(unsigned n)
 958 {
 959         const VehicleType &vtype = obj.layout.get_catalogue().get_vehicle(n);
 960         Vehicle *veh = new Vehicle(obj.layout, vtype);
 961         obj.vehicles.back()->attach_back(*veh);
 962         obj.vehicles.push_back(veh);
 963 }
 964
 965 } // namespace Marklin